期刊
ENVIRONMENTAL RESEARCH
卷 199, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2021.111398
关键词
Elasmobranch; Trophic plasticity; Mercury; Stable isotopes
资金
- Brazilian National Council for Scientific and Technological Development - CNPq [202788/20148]
- National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center - NOAA SWFSC
Aquatic pollution, specifically mercury contamination, is found to be widespread and strongly associated with diet and local contamination background in batoid species, exceeding EPA water quality standards. By using multiple biogeochemical tracers, researchers were able to uncover trophic interactions and mercury accumulation among batoid populations.
Aquatic pollution is known to reduce biodiversity and disrupt wildlife populations. Mercury (Hg) pollution is pervasive worldwide, contributing to the degradation of ecosystems, and causing deleterious effects to exposed organisms and populations. Batoids have a life history linked to the benthic substrate of coastal areas and occupy upper trophic levels. These combined with large bodies, long lifespan, and slow growth rates contributes to increased uptake and accumulation of Hg. However, mechanisms governing these associations are not well understood. Using multiple biogeochemical tracers (813C, 815N and total Hg), we describe trophic interactions of three sympatric batoid species inhabiting an urbanized estuary and identify diet sources that contribute to Hg accumulation and trophic position among these mesopredators. We also use the Bat-ray (Myliobatis californica) as a model species, to compare diet composition, trophic position, and isotopic niche between two populations in two Californian bays. Trophic plasticity in M. californica was characterized by isotopic niche, diet proportions, and trophic position estimates using Bayesian statistics. We found diet and local contamination background strongly associated with Hg accumulation, and Hg levels that exceed EPA water quality criterion (<0.3 mu g.g- 1 w. w.) in all studied species.
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