Understanding the role of ecological factors affecting mercury concentrations in the blue shark (Prionace glauca)

Riesgo, Lola; Sanpera, Carola; García-Barcelona, Salvador; Sánchez-Fortún, Moisés; Coll, Marta; Navarro, Joan

doi:10.1016/j.chemosphere.2022.137642

Cited by 7 publications

(4 citation statements)

References 58 publications

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“…), great white ( Carcharodon carcharias ), hammerhead ( Sphyrna spp. ), silky ( Carcharhinus falciformis) , bull ( Carcharhinus leucas ), lemon ( Negaprion brevirostris ), and porbeagle ( Lamna nasus ) sharks, where large individuals well exceed human health advisory standards (Branco et al 2004 , 2007 ; Escobar-Sánchez et al 2011 ; Maz-Courrau et al 2012 ; de Carvalho et al 2014 ; McKinney et al 2016 ; Nicolaus et al 2016 ; Matulik et al 2017 ; Biton-Porsmoguer et al 2018 ; Terrazas-López et al 2019 ; Rodriguez-Gutiérrez et al 2020 ; Maurice et al 2021 ; Erasmus et al 2022a , 2022b ; Riesgo et al 2023 ). Pelagic foraging piscivorous species tend to have higher Hg tissue concentrations compared to those foraging in benthic habitats and on invertebrates (de Pinho et al 2002 ; Matulik et al 2017 ).…”

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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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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“…Regression analysis exhibited a moderately strong relationship between total length and concentrations of Hg (R = 0.816, p < 0.001), As (R = 0.718, p = 0.004) and Cs (R = 0.551, p = 0.041) in the muscles and of As in gills (R = 0.837, p = 0.003) (Figure S2). Riesgo et al (2023) [61] also reported a positive correlation of Hg with size in muscle samples of P. glauca. A positive correlation between muscle tissue and size reveals metal bioaccumulation [62], while a negative one presents a small representation of all length values [63].…”

Section: Correlation With Sizementioning

confidence: 91%

Trace Metals Distribution in Tissues of 10 Different Shark Species from the Eastern Mediterranean Sea

Roubie,

Karavoltsos,

Sakellari

et al. 2024

Fishes

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As long-living apex predators, sharks tend to bioaccumulate trace metals through their diet. The distribution of Al, As, Cd, Co, Cr, Cs, Cu, Fe, Mn, Ni, Pb, V, Zn and Hg in different tissues (muscle, liver, heart, gills and gonads) of large-size (58–390 cm) sharks, some of which rare, of the eastern Mediterranean Sea was studied. Trace metals analyses in samples originating from ten different Chondrichthyes species were performed by inductively coupled plasma–mass spectrometry (ICP-MS) and Cold Vapor Atomic Absorption Spectrometry (CVAAS) for Hg. Data on trace metal levels are for the first time reported herewith for the species O. ferox and H. nakamurai. Higher median concentrations of trace metals were generally determined in the liver. The concentrations of Hg, Cs and As in the muscle increased proportionally with body length. Statistically significant differences between sexes were recorded for Hg, Cr, Ni and As (p = 0.015) in the muscle tissues of P. glauca. Muscle tissue Hg concentrations exceeded the EU maximum limit (1 μg g−1 wet weight) in 67% of the individuals sampled, with the highest concentrations detected in O. ferox and S. zygaena, whereas regarding Pb (limit 0.30 μg g−1 ww), the corresponding percentage was 15%. Arsenic concentrations were also of concern in almost all shark tissues examined.

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“…The process of biomagnification occurs when organisms at higher trophic levels consume prey that contains lower amounts of methylmercury. This bioaccumulation occurs up the food chain until it reaches predatory species such as sharks, swordfish, and tuna [ 69 ]. These predatory fish can accumulate very high concentrations of methylmercury and are therefore of concern to human health.…”

Section: Types Of Contaminants In Fishmentioning

confidence: 99%

Health benefits and health risks of contaminated fish consumption: Current research outputs, research approaches, and perspectives

Demelash Abera,

Alefe Adimas

2024

Heliyon

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Understanding the role of ecological factors affecting mercury concentrations in the blue shark (Prionace glauca)

Cited by 7 publications

References 58 publications

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

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

Trace Metals Distribution in Tissues of 10 Different Shark Species from the Eastern Mediterranean Sea

Health benefits and health risks of contaminated fish consumption: Current research outputs, research approaches, and perspectives

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