The role of tropical small-scale fisheries in trace element delivery for a Small Island Developing State community, the Seychelles

Sabino, Magali; Bodin, Nathalie; Govinden, Rodney; Arrisol, Rona; Churlaud, Carine; Bustamante, Paco

doi:10.1016/j.marpolbul.2022.113870

Cited by 12 publications

(9 citation statements)

References 55 publications

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“…Consequently, guano macronutrient levels were similar for our three study species. Micronutrient content in guano concurs with that of their prey, comprising small pelagic fish and cephalopods rich in iron and zinc (Sabino et al, 2022). These concentrations are consistent with results of recent reviews and meta-analyses, e.g.…”

Section: Discussionmentioning

confidence: 91%

Seabird traits and seasonality modulate nutrient dynamics of terrestrial and marine habitats on atolls

Appoo,

Bunbury,

Letori

et al. 2023

Preprint

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Marine nutrients underpin productivity and functioning of oceanic island ecosystems. Seabirds represent a primary source of marine nutrients. In tropical regions, some of the largest seabird populations nest on atolls, yet there is limited information available on seabird contributions to atoll ecosystem nutrient dynamics. To investigate the spatial and seasonal dynamics of seabird contributions, we assessed seabird colonies of different taxa, including red-footed boobies and terns, nesting on separate islands of Farquhar Atoll, Seychelles. We assessed nutrient concentrations of guano, soil, coastal plants and nearby seagrass in seabird colonies and at a control island with no seabirds, during the wet and dry seasons. Sooty terns contributed the highest quantities of nutrients, estimated at 71.2 N tonne.yr-1and 52.2 P tonne.yr-1. Seabird-derived nutrient transfer occurred year-round from seabird colonies to soil, coastal plants and seagrass. Soil macro- and inorganic nutrients were higher in the high-density, ground-nesting tern colony and during the dry season, coinciding with the breeding period of sooty terns. Both red-footed booby and tern colonies maintained high nitrogen levels (%N) in coastal plants year-round, while phosphorus levels (%P) did not differ between islands or seasons. Seabird-derived nitrogen reversed nitrogen limitation (log C:N) of seagrass during the dry season. We provide the first insights into seabird nutrient contributions to atoll ecosystems in Seychelles, with recommendations for seabird conservation to boost and support atoll and island ecosystem resilience. Our results from a relatively undisturbed atoll serve as a baseline with which more impacted atolls and future changes can be assessed.

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Section: Discussionmentioning

confidence: 91%

Seabird traits and seasonality modulate nutrient dynamics of terrestrial and marine habitats on atolls

Appoo,

Bunbury,

Letori

et al. 2023

Preprint

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“…While other environmental (e.g., contaminant mixes; Alves et al 2022 ), micronutrient (e.g., selenium; Lailson-Brito et al 2012 ; Gochfeld and Burger 2021 ; Storelli et al 2022 ; Sabino et al 2022 ), and nutritional factors (e.g., omega-3s; Sardenne et al 2020 ) clearly can confound assessments of Hg on human health those costs and benefits are not evaluated herein. The following biotic groups illustrate how biotic Hg exposure can be linked to human exposure concerns in several key ecosystems in the world using select bioindicators.…”

Section: Resultsmentioning

confidence: 99%

Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework

Evers,

Ackerman,

Åkerblom

et al. 2024

Ecotoxicology

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An important provision of the Minamata Convention on Mercury is to monitor and evaluate the effectiveness of the adopted measures and its implementation. Here, we describe for the first time currently available biotic mercury (Hg) data on a global scale to improve the understanding of global efforts to reduce the impact of Hg pollution on people and the environment. Data from the peer-reviewed literature were compiled in the Global Biotic Mercury Synthesis (GBMS) database (>550,000 data points). These data provide a foundation for establishing a biomonitoring framework needed to track Hg concentrations in biota globally. We describe Hg exposure in the taxa identified by the Minamata Convention: fish, sea turtles, birds, and marine mammals. Based on the GBMS database, Hg concentrations are presented at relevant geographic scales for continents and oceanic basins. We identify some effective regional templates for monitoring methylmercury (MeHg) availability in the environment, but overall illustrate that there is a general lack of regional biomonitoring initiatives around the world, especially in Africa, Australia, Indo-Pacific, Middle East, and South Atlantic and Pacific Oceans. Temporal trend data for Hg in biota are generally limited. Ecologically sensitive sites (where biota have above average MeHg tissue concentrations) have been identified throughout the world. Efforts to model and quantify ecosystem sensitivity locally, regionally, and globally could help establish effective and efficient biomonitoring programs. We present a framework for a global Hg biomonitoring network that includes a three-step continental and oceanic approach to integrate existing biomonitoring efforts and prioritize filling regional data gaps linked with key Hg sources. We describe a standardized approach that builds on an evidence-based evaluation to assess the Minamata Convention’s progress to reduce the impact of global Hg pollution on people and the environment.

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“…Additionally, over 70 species of fish relevant to the Seychelles’ diet have been analyzed for essential nutrients (e.g., trace elements, fatty acids, proteins) and for contaminants, not only focusing on mercury but also on cadmium, lead, and persistent organic pollutants (POPs) (Sabino et al 2022 ). Fish located in diverse marine areas are rich in essential trace elements, amino acids and omega-3 fatty acids which have a variety of health benefits.…”

Section: To 2000: Toxicological Studies On Highly Exposed Populationsmentioning

confidence: 99%

“…Thus, it is important to understand the safety of such high fish consumption and what are the micronutrients as well as risks of exposing to contaminants. A recent study, the SEYFISH project, was conducted to provide important baseline information on the micronutrient supply and contaminant exposure in edible parts of a total of 54 captured fisheries species from Seychelles coastal and offshore waters majority (Sabino et al 2022 ). Seychelles marine resources have total mercury levels below the EU recommended limits, which is 1 μg/g for large pelagic and 0.05 μg/g for all other species.…”

Section: To Current: Contemporary Investigations On Diverse Source-ex...mentioning

confidence: 99%

Our evolved understanding of the human health risks of mercury

Basu

Bastiansz

Dórea

et al. 2023

Ambio

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Mercury (Hg) is a chemical of health concern worldwide that is now being acted upon through the Minamata Convention. Operationalizing the Convention and tracking its effectiveness requires empathy of the diversity and variation of mercury exposure and risk in populations worldwide. As part of the health plenary for the 15th International Conference on Mercury as a Global Pollutant (ICMGP), this review paper details how scientific understandings have evolved over time, from tragic poisoning events in the mid-twentieth century to important epidemiological studies in the late-twentieth century in the Seychelles and Faroe Islands, the Arctic and Amazon. Entering the twenty-first century, studies on diverse source-exposure scenarios (e.g., ASGM, amalgams, contaminated sites, cosmetics, electronic waste) from across global regions have expanded understandings and exemplified the need to consider socio-environmental variables and local contexts when conducting health studies. We conclude with perspectives on next steps for mercury health research in the post-Minamata Convention era.

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The role of tropical small-scale fisheries in trace element delivery for a Small Island Developing State community, the Seychelles

Cited by 12 publications

References 55 publications

Seabird traits and seasonality modulate nutrient dynamics of terrestrial and marine habitats on atolls

Seabird traits and seasonality modulate nutrient dynamics of terrestrial and marine habitats on atolls

Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework

Our evolved understanding of the human health risks of mercury

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