Trophic ecology of sympatric batoid species (Chondrichthyes: Batoidea) assessed by multiple biogeochemical tracers (δ13C, δ15N and total Hg)

Bezerra, M.F.; Seminoff, J.A.; Lemons, G.E.; Slotton, D.G.; Watanabe, K.; Lai, C.T.

doi:10.1016/j.envres.2021.111398

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

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Trophic ecology of sympatric batoid species (Chondrichthyes: Batoidea) assessed by multiple biogeochemical tracers (δ13C, δ15N and total Hg)

2021
By Bezerra, M.F. ; Seminoff, J.A. ; Lemons, G.E. ; ...
Source: Environmental Research, 199, 111398

[PDF-2.67 MB]

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Journal Title:

Environmental Research
Personal Author:

Bezerra, M.F. ; Seminoff, J.A. ; Lemons, G.E. ; Slotton, D.G. ; Watanabe, K. ; ... More +

Bezerra, M.F. ; Seminoff, J.A. ; Lemons, G.E. ; Slotton, D.G. ; Watanabe, K. ; Lai, C.T. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) Less -
Description:

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 (δ13C, δ15N 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 μg.g−1 w.w.) in all studied species.
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Biochemistry General Environmental Science
Source:

Environmental Research, 199, 111398
DOI:

https://doi.org/10.1016/j.envres.2021.111398
ISSN:

0013-9351
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PDF
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Elsevier BV
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Journal Article
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https://creativecommons.org/licenses/by-nc-nd/4.0/
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CC BY-NC-ND
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urn:sha-512:77b16faba830e3495c38ecbb63483fa516efebfc7484d8f1da6f3af5c0766415d7411ffb17356e797d84072d488d507e2e237b54bce093ec8d336c412c1717af
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Trophic ecology of sympatric batoid species (Chondrichthyes: Batoidea) assessed by multiple biogeochemical tracers (δ13C, δ15N and total Hg)

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