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  • SDSN - Greece
  • 2022-2022
  • Publications
  • Frontiers in Marine Science

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Lisa Skein; Lisa Skein; Kerry J. Sink; Kerry J. Sink; +5 Authors

    The need to move toward marine ecosystem-based management is globally recognized. Few countries effectively account for multiple interacting pressures in their marine assessments, planning and management. Many socio-economic sectors currently operate in South African waters and in most cases, their associated pressures are managed on a sector-by-sector basis and interacting pressures are seldom accounted for in assessments or decision-making. For ecosystem-based management to be effective, a science-based approach to prioritize sectors and pressures needing most urgent action, and to identify affected ecological components is needed. Integrated Ecosystem Assessment (IEA) has hence been put forward as a tool that can organize relevant information and provide context for cross-sectoral management decisions. Consisting of five main stages that form an iterative cycle, the first IEA stage involves scoping of top management priorities in a given area and can be done by way of risk assessment. Through the ODEMM (Options for Delivering Ecosystem-based Marine Management) approach, linkage chains (interactions) among sectors, pressures and affected ecological components for the entirety of the South African marine territory were identified. Subsequently, impact risk scores of each linkage chain were calculated based on the exposure and severity of impacts faced by ecological components from pressures that are associated with each sector. Fishing was the sector with the greatest connectivity (11.65% proportional connectance) in the framework and ranked highest in terms of impact risk (summed), followed by Shipping and Coastal infrastructure. Pressures with the most serious impacts on ecological components, as identified through summed impact risk scores, included Bycatch, Species extraction, and Incidental loss and the ecological components most affected were those primarily associated with Fishing and its associated pressures. These findings align with those of the recent South African National Biodiversity Assessment and corroborate views of local stakeholders. This study also identified key local knowledge gaps, including impacts of underwater noise, invasive species, and climate change, that must be better understood to improve assessment accuracy and guide management prioritization of pressures exerted by most impactful sectors.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Marine ...arrow_drop_down
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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
    License: CC BY
    Data sources: Crossref
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Frontiers in Marine Science
    Article . 2022
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Marine ...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
      License: CC BY
      Data sources: Crossref
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Frontiers in Marine Science
      Article . 2022
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Lőrinc Mészáros; Lőrinc Mészáros; Frank van der Meulen; Geurt Jongbloed; +2 Authors

    Coastal climate impact studies make increasing use of multi-source and multi-dimensional atmospheric and environmental datasets to investigate relationships between climate signals and the ecological response. The large quantity of numerically simulated data may, however, include redundancy, multi-colinearity and excess information not relevant to the studied processes. In such cases techniques for feature extraction and identification of latent processes prove useful. Using dimensionality reduction techniques this research provides a statistical underpinning of variable selection to study the impacts of atmospheric processes on coastal chlorophyll-a concentrations, taking the Dutch Wadden Sea as case study. Dimension reduction techniques are applied to environmental data simulated by the Delft3D coastal water quality model, the HIRLAM numerical weather prediction model and the Euro-CORDEX climate modelling experiment. The dimension reduction techniques were selected for their ability to incorporate (1) spatial correlation via multi-way methods (2), temporal correlation through Dynamic Factor Analysis, and (3) functional variability using Functional Data Analysis. The data reduction potential and explanatory value of these methods are showcased and important atmospheric variables affecting the chlorophyll-a concentration are identified. Our results indicate room for dimensionality reduction in the atmospheric variables (2 principle components can explain the majority of variance instead of 7 variables), in the chlorophyll-a time series at different locations (two characteristic patterns can describe the 10 locations), and in the climate projection scenarios of solar radiation and air temperature variables (a single principle component function explains 77% of the variation for solar radiation and 57% of the variation for air temperature). It was also found that solar radiation followed by air temperature are the most important atmospheric variables related to coastal chlorophyll-a concentration, noting that regional differences exist, for instance the importance of air temperature is greater in the Eastern Dutch Wadden Sea at Dantziggat than in the Western Dutch Wadden Sea at Marsdiep Noord. Common trends and different regional system characteristics have also been identified through dynamic factor analysis between the deeper channels and the shallower intertidal zones, where the onset of spring blooms occurs earlier. The functional analysis of climate data showed clusters of atmospheric variables with similar functional features. Moreover, functional components of Euro-CORDEX climate scenarios have been identified for radiation and temperature variables, which provide information on the dominant mode (pattern) of variation and its uncertainties. The findings suggest that radiation and temperature projections of different Euro-CORDEX scenarios share similar characteristics and mainly differ in their amplitudes and seasonal patterns, offering opportunities to construct statistical models that do not assume independence between climate scenarios but instead borrow information (“borrow strength”) from the larger pool of climate scenarios. The presented results were used in follow up studies to construct a Bayesian stochastic generator to complement existing Euro-CORDEX climate change scenarios and to quantify climate change induced trends and uncertainties in phytoplankton spring bloom dynamics in the Dutch Wadden Sea.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ NARCIS; TU Delft Rep...arrow_drop_down
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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
    License: CC BY
    Data sources: Crossref; NARCIS
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Frontiers in Marine Science
    Article . 2022
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ NARCIS; TU Delft Rep...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
      License: CC BY
      Data sources: Crossref; NARCIS
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Frontiers in Marine Science
      Article . 2022
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Aikaterini A. Zompra; Styliani A. Chasapi; Matthew S. Twigg; Karina Salek; +10 Authors

    Synthetic surfactants are used in several industries, including manufacturing, pharmaceutical and cosmetic’s, food and feed, agriculture, petroleum and environmental remediation for their ability to adsorb to fluid and solid-water interfaces. However, their widespread use and their synthetic preparation through environmentally unfavorable processes counterbalances the value of this class of reagents. This fact has stimulated new efforts to exploit natural sources of surfactants, such as new classes of bacterial systems or manipulation of existing biological systems, that may produce, through an environmentally friendly process, new biodegradable surfactants and emulsifiers of high commercial value. A downside of microbial production of biobased chemicals such as these types of chemicals, is that their fermentation often yields crude materials consisting of several bioproducts with complex physical and chemical properties. Extraction, identification, and efficient characterization of biosurfactants from a crude mixture of biomolecules requires carefully designed, and detailed analytical processes using state-of-the-art methods. The purpose of this review article is to present the current state-of-the-art and future outlook on the various multidisciplinary biophysical methods applied in the discovery, extraction identification, and in-depth characterization of microbially-produced surface‐active compounds.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Marine ...arrow_drop_down
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    Frontiers in Marine Science
    Article . 2022
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Marine ...arrow_drop_down
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      Frontiers in Marine Science
      Article . 2022
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Saeed Hariri; Martin Plus; Mickael Le Gac; Véronique Séchet; +2 Authors
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Marine ...arrow_drop_down
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    Frontiers in Marine Science
    Article . 2022
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Marine ...arrow_drop_down
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      Frontiers in Marine Science
      Article . 2022
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      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Chris O’Halloran; Mary Silver; Mary Silver;

    Ocean literacy influences ocean conservation and might have an impact on sustainable development practices. We investigated the knowledge American adults possess concerning ocean literacy principles and ocean conservation behaviors by asking participants (N=1226) to complete an online survey on ocean literacy principles, health and well-being benefits of time spent in or by the ocean, emotions that result in behavioral change for conservation, and conservation actions. We used a representative sample of the US population by age, gender, and location. The majority of participants were aware of the ocean literacy principle, that the ocean supports a great diversity of life and ecosystems (82%). Calmness, stress reduction, reduced depression, awe, connection with nature, greater life satisfaction, improved happiness, and a feeling of a spiritual connection or refuge were all associated with the ocean environment’s emotional health benefits. Monthly beach trips were associated with the physical health benefits of spending time near the ocean. Engagement in ocean conservation action was associated with multiple factors, including awareness of ocean literacy principles (the ocean is largely unexplored, ocean health and human health are connected, and the ocean regulates our climate and weather), monthly visits to the ocean, emotions of sadness and awe, feeling a connection to nature, living 10 miles or less to the ocean, and viewing nature documentaries and Instagram. Findings from this study may provide ideas how to engage the American public in understanding, valuing, and caring for our shared life sustaining ocean.

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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
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    Frontiers in Marine Science
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Marine ...arrow_drop_down
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      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
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    Authors: Ana Rato; Ana Rato; Sandra Joaquim; Sandra Joaquim; +6 Authors

    European clam (Ruditapes decussatus) is one of the most relevant emergent bivalve species from the aquaculture sector in Europe with high economic value. Climate changes represent a potential limiting factor to this activity, directly interfering with the survival and behavior of bivalves. Severe fluctuations in temperature along with periods of heavy rainfall or periods of drought that significantly change the salinity can promote physiological stress in bivalves, resulting in changes in physiological and behavioral responses and, in extreme cases, leading to high mortalities. This study aimed to evaluate the combined effect of temperature and salinity on mortality and feeding behavior of R. decussatus. Juveniles and adults were exposed to combined ranges of temperature (5 degrees C-35 degrees C) and salinity (0-40). Mortality and feeding behavior were registered every 24 h of each 120-h trial. A control temperature range was set between 15 degrees C and 23 degrees C, where mortality and feeding behavior were considered as the normal scenario. Our data suggested salinity 15 as a "turning point," a point from which occurred distinct patterns in mortality and feeding behavior. The results evidently indicate that abrupt reductions in salinity and sharp increases in temperature will lead to high mortality of R. decussatus. Juveniles were revealed to be more sensitive to the increase of temperature in a less saline environment, to suffer greater and faster mortalities, and to be more resistant to extremely high temperatures under more saline conditions. The high temperatures and sporadic heavy rainfall that are predicted to occur in the south of Europe due to climate changes will contribute to compromise the recruitment of European clam, thus threatening the production of this species and consequently impacting the economic sector. info:eu-repo/semantics/publishedVersion

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    Frontiers in Marine Science
    Article . 2022
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    Frontiers in Marine Science
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      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
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    Authors: Zaira Da Ros; Antonio Dell’Anno; Emanuela Fanelli; Emanuela Fanelli; +5 Authors

    Cold-water coral (CWC) systems are hotspots of biodiversity that need protection from the increasing human impacts and global climate change. The restoration of degraded cold-water coral reefs may be conducted through transplantation of nubbins. To do so, we need to set up the optimal conditions for CWCs livelihood in an aquarium setting. Here we investigated the food selection of three cold-water coral species inhabiting the NE Atlantic Ocean and the Mediterranean Sea to identify the optimal feeding conditions to rear corals, by means of stable isotope analysis (δ15N and δ13C) and of prey-capture rates. Colonies of Desmophyllum pertusum, Madrepora oculata and Dendrophyllia cornigera were collected in the Mediterranean Sea and nourished in mesocosms with a) nauplii of Artemia salina, b) the green algae Tetraselmis subcordiformis, c) two rotifer species (Brachionus plicatilisand B. rotundiformis) and d) mysids of the species Mysis relicta. Prey-capture rates coupled with isotope analysis revealed that M. relictawas the preferred food source even if it was provided as a frozen item, followed by the live-items A. salina and Brachionus spp. Isotopic analyses allowed to determine that Particulate Organic Matter (POM) appears to contribe to a large portion of the isotopic composition of the coral tissue and also suggested that M. oculata has the most opportunistic behaviour among the three target coral species. This study confirms that it is possible to optimize CWCs livelihood in aquaria choosing the right food sources during their maintenance, also in preparation to their transplant in degraded habitats during future projects of active restoration.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Marine ...arrow_drop_down
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    Frontiers in Marine Science
    Article . 2022
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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
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      Frontiers in Marine Science
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    Authors: Telmo Morato; Telmo Morato; Manuela Juliano; Manuela Juliano; +8 Authors

    It is increasingly recognised that deep-sea mining of seafloor massive sulphides (SMS) could become an important source of mineral resources. These operations will remove the targeted substrate and produce potentially toxic plumes from in situ seabed excavation and from the return water pumped back down to the seafloor. However, the spatial extent of the impact of deep-sea mining is still uncertain because few field experiments and models of plume dispersion have been conducted. In this study, we used three-dimensional hydrodynamic models of the Azores region together with a theoretical commercial mining operation of polymetallic SMS to simulate the potential dispersal of plumes originating from different phases of mining operations, and to assess the magnitude of potential impacts. Although the model simulations presented here were subject to many caveats, they did reveal some important patterns. The model projected marked differences among sites making generalisations about plume-dispersal patterns in mid-ocean ridges difficult. Nevertheless, the models predicted large horizontal and vertical plume-dispersals above the thresholds adopted. Persistent plumes (temporal frequency >50%, i.e., 6 months out of 12 months) were projected to disperse an average linear distance of 10 to 20 km, cover an area of 17 to 150 km2, and extend more than 800 m in the water column. In fact, the model projected that plumes may disperse beyond the licensed mining areas, reach the flanks and summits of nearby topographic features, and extend into the bathypelagic, mesopelagic, and epipelagic environments. Modelled plume-dispersal overlaps with the predicted distribution of cold-water corals and with existing fishing activities. These potential impacts would be of particular concern in regions such as the Azores, where local populations are highly dependent on the sea for their livelihoods. The findings of this study are an important initial step towards understanding the nature and magnitude of deep-sea mining impacts in space and time.

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    Frontiers in Marine Science
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      Frontiers in Marine Science
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    Authors: Konstantinos Tsagarakis; Simone Libralato; Marianna Giannoulaki; Konstantinos Touloumis; +6 Authors

    Ecosystem models are important tools for the implementation of Ecosystem Based Fisheries Management (EBFM), especially in highly exploited ecosystems affected by climate change, such as the Mediterranean Sea. Herein, we present the development of an Ecopath ecosystem model for the North Aegean Sea (Eastern Mediterranean) in the early 1990s, as well as the parameterization of the temporal dynamic module (Ecosim) after fitting to catch and relative biomass time series for the period 1993-2020. The Ecosim model included as drivers (i) fishing, assuming a technology creep factor of 2% annual increase (0.79% for bottom trawls), (ii) Sea Surface Temperature, (iii) trophic interactions and (iv) a Primary Production (PP) Anomaly which was positively correlated with the North Atlantic Oscillation of the previous year, highlighting the synergistic effect of environmental and anthropogenic processes during the three-decades hindcast period. Trends in biomasses, catches and ecosystem indicators were characterized by a decline from 1993 to 2010 and a strong recovery thereafter. Sea warming scenarios for the period 2021-2050 indicated contrasting responses to increased temperature among the main commercial groups, while simulations of changes in productivity had relatively straightforward effects. Two scenarios of 10% and 25% reduction in fishing effort revealed quick increases in the biomass of most commercial species, though coupled with lower catches due to reduced fishing, except for few groups that their population increase was remarkably high. Although the 25% effort reduction resulted in high recoveries in the short term, it didn’t necessarily lead to constantly high biomasses resulting in reduced catches towards the end of the forecast period for some groups, in contrast to the 10% reduction. When impacts of reduced productivity were added to temperature effects, the model forecasted lower biomass increases for the winners of sea warming and even higher decreases for the losers. Biomass losses were compensated by a 10% reduction in fishing effort, but this was not overall enough to counterbalance losses in catches. The model developed here contributes to better elucidate observed changes in the past and to hind directions of change in future simulations, as well as to advance EBFM in the area.

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    Frontiers in Marine Science
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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
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      Frontiers in Marine Science
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      Frontiers in Marine Science
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    Authors: Kaylee P Smit; Kaylee P Smit; Lara Van Niekerk; Lara Van Niekerk; +5 Authors

    Despite the increasing number of tools and indicators to measure biodiversity status and trends, many developing countries struggle to initiate and advance coastal and marine assessments needed to monitor and track national and international progress in biodiversity targets. We identified five key challenges that hinder progress in this context, based on a national marine assessment workshop held in South Africa, and developed recommendations and tangible actions to address these challenges drawing from multiple national assessments, regional initiatives, and global collaborations over the last 15 years. Challenges include a poor understanding of methods, limited capacity and funding for assessments, a lack of systematic approaches to biodiversity assessment and indicator development, and scattered efforts that often fail to link science to policy. Key actions could enable the development of a coordinated framework to feed into policy and decision-making at multiple scales. We provide South African examples to highlight a developing country’s progress toward marine biodiversity assessment and provide a roadmap to integrated monitoring, assessment, and reporting based on positive outcomes. Recommendations to address challenges include building collective understanding of assessment tools and methods, prioritizing pressures urgently needing mitigation measures, using relevant indicators to support reporting at multiple scales, applying coordinated approaches to identify gaps and opportunities, codeveloping coordinated approaches with direct policy links, and leveraging resources and technical capacity for iterative improvement. This roadmap can guide developing and developed countries and support global best practices to collaboratively advance marine and coastal ecosystem monitoring and assessment at multiple scales for meeting many objectives.

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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
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    Frontiers in Marine Science
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      Frontiers in Marine Science
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Lisa Skein; Lisa Skein; Kerry J. Sink; Kerry J. Sink; +5 Authors

    The need to move toward marine ecosystem-based management is globally recognized. Few countries effectively account for multiple interacting pressures in their marine assessments, planning and management. Many socio-economic sectors currently operate in South African waters and in most cases, their associated pressures are managed on a sector-by-sector basis and interacting pressures are seldom accounted for in assessments or decision-making. For ecosystem-based management to be effective, a science-based approach to prioritize sectors and pressures needing most urgent action, and to identify affected ecological components is needed. Integrated Ecosystem Assessment (IEA) has hence been put forward as a tool that can organize relevant information and provide context for cross-sectoral management decisions. Consisting of five main stages that form an iterative cycle, the first IEA stage involves scoping of top management priorities in a given area and can be done by way of risk assessment. Through the ODEMM (Options for Delivering Ecosystem-based Marine Management) approach, linkage chains (interactions) among sectors, pressures and affected ecological components for the entirety of the South African marine territory were identified. Subsequently, impact risk scores of each linkage chain were calculated based on the exposure and severity of impacts faced by ecological components from pressures that are associated with each sector. Fishing was the sector with the greatest connectivity (11.65% proportional connectance) in the framework and ranked highest in terms of impact risk (summed), followed by Shipping and Coastal infrastructure. Pressures with the most serious impacts on ecological components, as identified through summed impact risk scores, included Bycatch, Species extraction, and Incidental loss and the ecological components most affected were those primarily associated with Fishing and its associated pressures. These findings align with those of the recent South African National Biodiversity Assessment and corroborate views of local stakeholders. This study also identified key local knowledge gaps, including impacts of underwater noise, invasive species, and climate change, that must be better understood to improve assessment accuracy and guide management prioritization of pressures exerted by most impactful sectors.

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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
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    Frontiers in Marine Science
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      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
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    Authors: Lőrinc Mészáros; Lőrinc Mészáros; Frank van der Meulen; Geurt Jongbloed; +2 Authors

    Coastal climate impact studies make increasing use of multi-source and multi-dimensional atmospheric and environmental datasets to investigate relationships between climate signals and the ecological response. The large quantity of numerically simulated data may, however, include redundancy, multi-colinearity and excess information not relevant to the studied processes. In such cases techniques for feature extraction and identification of latent processes prove useful. Using dimensionality reduction techniques this research provides a statistical underpinning of variable selection to study the impacts of atmospheric processes on coastal chlorophyll-a concentrations, taking the Dutch Wadden Sea as case study. Dimension reduction techniques are applied to environmental data simulated by the Delft3D coastal water quality model, the HIRLAM numerical weather prediction model and the Euro-CORDEX climate modelling experiment. The dimension reduction techniques were selected for their ability to incorporate (1) spatial correlation via multi-way methods (2), temporal correlation through Dynamic Factor Analysis, and (3) functional variability using Functional Data Analysis. The data reduction potential and explanatory value of these methods are showcased and important atmospheric variables affecting the chlorophyll-a concentration are identified. Our results indicate room for dimensionality reduction in the atmospheric variables (2 principle components can explain the majority of variance instead of 7 variables), in the chlorophyll-a time series at different locations (two characteristic patterns can describe the 10 locations), and in the climate projection scenarios of solar radiation and air temperature variables (a single principle component function explains 77% of the variation for solar radiation and 57% of the variation for air temperature). It was also found that solar radiation followed by air temperature are the most important atmospheric variables related to coastal chlorophyll-a concentration, noting that regional differences exist, for instance the importance of air temperature is greater in the Eastern Dutch Wadden Sea at Dantziggat than in the Western Dutch Wadden Sea at Marsdiep Noord. Common trends and different regional system characteristics have also been identified through dynamic factor analysis between the deeper channels and the shallower intertidal zones, where the onset of spring blooms occurs earlier. The functional analysis of climate data showed clusters of atmospheric variables with similar functional features. Moreover, functional components of Euro-CORDEX climate scenarios have been identified for radiation and temperature variables, which provide information on the dominant mode (pattern) of variation and its uncertainties. The findings suggest that radiation and temperature projections of different Euro-CORDEX scenarios share similar characteristics and mainly differ in their amplitudes and seasonal patterns, offering opportunities to construct statistical models that do not assume independence between climate scenarios but instead borrow information (“borrow strength”) from the larger pool of climate scenarios. The presented results were used in follow up studies to construct a Bayesian stochastic generator to complement existing Euro-CORDEX climate change scenarios and to quantify climate change induced trends and uncertainties in phytoplankton spring bloom dynamics in the Dutch Wadden Sea.

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    Frontiers in Marine Science
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      Frontiers in Marine Science
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    Authors: Aikaterini A. Zompra; Styliani A. Chasapi; Matthew S. Twigg; Karina Salek; +10 Authors

    Synthetic surfactants are used in several industries, including manufacturing, pharmaceutical and cosmetic’s, food and feed, agriculture, petroleum and environmental remediation for their ability to adsorb to fluid and solid-water interfaces. However, their widespread use and their synthetic preparation through environmentally unfavorable processes counterbalances the value of this class of reagents. This fact has stimulated new efforts to exploit natural sources of surfactants, such as new classes of bacterial systems or manipulation of existing biological systems, that may produce, through an environmentally friendly process, new biodegradable surfactants and emulsifiers of high commercial value. A downside of microbial production of biobased chemicals such as these types of chemicals, is that their fermentation often yields crude materials consisting of several bioproducts with complex physical and chemical properties. Extraction, identification, and efficient characterization of biosurfactants from a crude mixture of biomolecules requires carefully designed, and detailed analytical processes using state-of-the-art methods. The purpose of this review article is to present the current state-of-the-art and future outlook on the various multidisciplinary biophysical methods applied in the discovery, extraction identification, and in-depth characterization of microbially-produced surface‐active compounds.

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    Authors: Saeed Hariri; Martin Plus; Mickael Le Gac; Véronique Séchet; +2 Authors
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    Frontiers in Marine Science
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      Frontiers in Marine Science
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    Authors: Chris O’Halloran; Mary Silver; Mary Silver;

    Ocean literacy influences ocean conservation and might have an impact on sustainable development practices. We investigated the knowledge American adults possess concerning ocean literacy principles and ocean conservation behaviors by asking participants (N=1226) to complete an online survey on ocean literacy principles, health and well-being benefits of time spent in or by the ocean, emotions that result in behavioral change for conservation, and conservation actions. We used a representative sample of the US population by age, gender, and location. The majority of participants were aware of the ocean literacy principle, that the ocean supports a great diversity of life and ecosystems (82%). Calmness, stress reduction, reduced depression, awe, connection with nature, greater life satisfaction, improved happiness, and a feeling of a spiritual connection or refuge were all associated with the ocean environment’s emotional health benefits. Monthly beach trips were associated with the physical health benefits of spending time near the ocean. Engagement in ocean conservation action was associated with multiple factors, including awareness of ocean literacy principles (the ocean is largely unexplored, ocean health and human health are connected, and the ocean regulates our climate and weather), monthly visits to the ocean, emotions of sadness and awe, feeling a connection to nature, living 10 miles or less to the ocean, and viewing nature documentaries and Instagram. Findings from this study may provide ideas how to engage the American public in understanding, valuing, and caring for our shared life sustaining ocean.

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    Frontiers in Marine Science
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    Authors: Ana Rato; Ana Rato; Sandra Joaquim; Sandra Joaquim; +6 Authors

    European clam (Ruditapes decussatus) is one of the most relevant emergent bivalve species from the aquaculture sector in Europe with high economic value. Climate changes represent a potential limiting factor to this activity, directly interfering with the survival and behavior of bivalves. Severe fluctuations in temperature along with periods of heavy rainfall or periods of drought that significantly change the salinity can promote physiological stress in bivalves, resulting in changes in physiological and behavioral responses and, in extreme cases, leading to high mortalities. This study aimed to evaluate the combined effect of temperature and salinity on mortality and feeding behavior of R. decussatus. Juveniles and adults were exposed to combined ranges of temperature (5 degrees C-35 degrees C) and salinity (0-40). Mortality and feeding behavior were registered every 24 h of each 120-h trial. A control temperature range was set between 15 degrees C and 23 degrees C, where mortality and feeding behavior were considered as the normal scenario. Our data suggested salinity 15 as a "turning point," a point from which occurred distinct patterns in mortality and feeding behavior. The results evidently indicate that abrupt reductions in salinity and sharp increases in temperature will lead to high mortality of R. decussatus. Juveniles were revealed to be more sensitive to the increase of temperature in a less saline environment, to suffer greater and faster mortalities, and to be more resistant to extremely high temperatures under more saline conditions. The high temperatures and sporadic heavy rainfall that are predicted to occur in the south of Europe due to climate changes will contribute to compromise the recruitment of European clam, thus threatening the production of this species and consequently impacting the economic sector. info:eu-repo/semantics/publishedVersion

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    Authors: Zaira Da Ros; Antonio Dell’Anno; Emanuela Fanelli; Emanuela Fanelli; +5 Authors

    Cold-water coral (CWC) systems are hotspots of biodiversity that need protection from the increasing human impacts and global climate change. The restoration of degraded cold-water coral reefs may be conducted through transplantation of nubbins. To do so, we need to set up the optimal conditions for CWCs livelihood in an aquarium setting. Here we investigated the food selection of three cold-water coral species inhabiting the NE Atlantic Ocean and the Mediterranean Sea to identify the optimal feeding conditions to rear corals, by means of stable isotope analysis (δ15N and δ13C) and of prey-capture rates. Colonies of Desmophyllum pertusum, Madrepora oculata and Dendrophyllia cornigera were collected in the Mediterranean Sea and nourished in mesocosms with a) nauplii of Artemia salina, b) the green algae Tetraselmis subcordiformis, c) two rotifer species (Brachionus plicatilisand B. rotundiformis) and d) mysids of the species Mysis relicta. Prey-capture rates coupled with isotope analysis revealed that M. relictawas the preferred food source even if it was provided as a frozen item, followed by the live-items A. salina and Brachionus spp. Isotopic analyses allowed to determine that Particulate Organic Matter (POM) appears to contribe to a large portion of the isotopic composition of the coral tissue and also suggested that M. oculata has the most opportunistic behaviour among the three target coral species. This study confirms that it is possible to optimize CWCs livelihood in aquaria choosing the right food sources during their maintenance, also in preparation to their transplant in degraded habitats during future projects of active restoration.

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    Frontiers in Marine Science
    Article . 2022
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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
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      Frontiers in Marine Science
      Article . 2022
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      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
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    Authors: Telmo Morato; Telmo Morato; Manuela Juliano; Manuela Juliano; +8 Authors

    It is increasingly recognised that deep-sea mining of seafloor massive sulphides (SMS) could become an important source of mineral resources. These operations will remove the targeted substrate and produce potentially toxic plumes from in situ seabed excavation and from the return water pumped back down to the seafloor. However, the spatial extent of the impact of deep-sea mining is still uncertain because few field experiments and models of plume dispersion have been conducted. In this study, we used three-dimensional hydrodynamic models of the Azores region together with a theoretical commercial mining operation of polymetallic SMS to simulate the potential dispersal of plumes originating from different phases of mining operations, and to assess the magnitude of potential impacts. Although the model simulations presented here were subject to many caveats, they did reveal some important patterns. The model projected marked differences among sites making generalisations about plume-dispersal patterns in mid-ocean ridges difficult. Nevertheless, the models predicted large horizontal and vertical plume-dispersals above the thresholds adopted. Persistent plumes (temporal frequency >50%, i.e., 6 months out of 12 months) were projected to disperse an average linear distance of 10 to 20 km, cover an area of 17 to 150 km2, and extend more than 800 m in the water column. In fact, the model projected that plumes may disperse beyond the licensed mining areas, reach the flanks and summits of nearby topographic features, and extend into the bathypelagic, mesopelagic, and epipelagic environments. Modelled plume-dispersal overlaps with the predicted distribution of cold-water corals and with existing fishing activities. These potential impacts would be of particular concern in regions such as the Azores, where local populations are highly dependent on the sea for their livelihoods. The findings of this study are an important initial step towards understanding the nature and magnitude of deep-sea mining impacts in space and time.

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    Frontiers in Marine Science
    Article . 2022
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      Frontiers in Marine Science
      Article . 2022
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    Authors: Konstantinos Tsagarakis; Simone Libralato; Marianna Giannoulaki; Konstantinos Touloumis; +6 Authors

    Ecosystem models are important tools for the implementation of Ecosystem Based Fisheries Management (EBFM), especially in highly exploited ecosystems affected by climate change, such as the Mediterranean Sea. Herein, we present the development of an Ecopath ecosystem model for the North Aegean Sea (Eastern Mediterranean) in the early 1990s, as well as the parameterization of the temporal dynamic module (Ecosim) after fitting to catch and relative biomass time series for the period 1993-2020. The Ecosim model included as drivers (i) fishing, assuming a technology creep factor of 2% annual increase (0.79% for bottom trawls), (ii) Sea Surface Temperature, (iii) trophic interactions and (iv) a Primary Production (PP) Anomaly which was positively correlated with the North Atlantic Oscillation of the previous year, highlighting the synergistic effect of environmental and anthropogenic processes during the three-decades hindcast period. Trends in biomasses, catches and ecosystem indicators were characterized by a decline from 1993 to 2010 and a strong recovery thereafter. Sea warming scenarios for the period 2021-2050 indicated contrasting responses to increased temperature among the main commercial groups, while simulations of changes in productivity had relatively straightforward effects. Two scenarios of 10% and 25% reduction in fishing effort revealed quick increases in the biomass of most commercial species, though coupled with lower catches due to reduced fishing, except for few groups that their population increase was remarkably high. Although the 25% effort reduction resulted in high recoveries in the short term, it didn’t necessarily lead to constantly high biomasses resulting in reduced catches towards the end of the forecast period for some groups, in contrast to the 10% reduction. When impacts of reduced productivity were added to temperature effects, the model forecasted lower biomass increases for the winners of sea warming and even higher decreases for the losers. Biomass losses were compensated by a 10% reduction in fishing effort, but this was not overall enough to counterbalance losses in catches. The model developed here contributes to better elucidate observed changes in the past and to hind directions of change in future simulations, as well as to advance EBFM in the area.

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    Frontiers in Marine Science
    Article . 2022
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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
    License: CC BY
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      Frontiers in Marine Science
      Article . 2022
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      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
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    Authors: Kaylee P Smit; Kaylee P Smit; Lara Van Niekerk; Lara Van Niekerk; +5 Authors

    Despite the increasing number of tools and indicators to measure biodiversity status and trends, many developing countries struggle to initiate and advance coastal and marine assessments needed to monitor and track national and international progress in biodiversity targets. We identified five key challenges that hinder progress in this context, based on a national marine assessment workshop held in South Africa, and developed recommendations and tangible actions to address these challenges drawing from multiple national assessments, regional initiatives, and global collaborations over the last 15 years. Challenges include a poor understanding of methods, limited capacity and funding for assessments, a lack of systematic approaches to biodiversity assessment and indicator development, and scattered efforts that often fail to link science to policy. Key actions could enable the development of a coordinated framework to feed into policy and decision-making at multiple scales. We provide South African examples to highlight a developing country’s progress toward marine biodiversity assessment and provide a roadmap to integrated monitoring, assessment, and reporting based on positive outcomes. Recommendations to address challenges include building collective understanding of assessment tools and methods, prioritizing pressures urgently needing mitigation measures, using relevant indicators to support reporting at multiple scales, applying coordinated approaches to identify gaps and opportunities, codeveloping coordinated approaches with direct policy links, and leveraging resources and technical capacity for iterative improvement. This roadmap can guide developing and developed countries and support global best practices to collaboratively advance marine and coastal ecosystem monitoring and assessment at multiple scales for meeting many objectives.

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    Frontiers in Marine Science
    Article . 2022 . Peer-reviewed
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    Frontiers in Marine Science
    Article . 2022
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      Frontiers in Marine Science
      Article . 2022 . Peer-reviewed
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      Frontiers in Marine Science
      Article . 2022
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