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Mercury Isotope Values in Shoreline Spiders Reveal the Transfer of Aquatic Mercury Sources to Terrestrial Food Webs

[Image: see text] The transfer of aquatic contaminants, including mercury (Hg), to terrestrial food webs is an often-overlooked exposure pathway to terrestrial animals. While research has implemented the use of shoreline spiders to assess aquatic to terrestrial Hg transfer, it is unclear whether Hg...

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Autores principales: Janssen, Sarah E., Kotalik, Christopher J., Eagles-Smith, Collin A., Beaubien, Gale B., Hoffman, Joel C., Peterson, Greg, Mills, Marc A., Walters, David M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10569030/
https://www.ncbi.nlm.nih.gov/pubmed/37840816
http://dx.doi.org/10.1021/acs.estlett.3c00450
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author Janssen, Sarah E.
Kotalik, Christopher J.
Eagles-Smith, Collin A.
Beaubien, Gale B.
Hoffman, Joel C.
Peterson, Greg
Mills, Marc A.
Walters, David M.
author_facet Janssen, Sarah E.
Kotalik, Christopher J.
Eagles-Smith, Collin A.
Beaubien, Gale B.
Hoffman, Joel C.
Peterson, Greg
Mills, Marc A.
Walters, David M.
author_sort Janssen, Sarah E.
collection PubMed
description [Image: see text] The transfer of aquatic contaminants, including mercury (Hg), to terrestrial food webs is an often-overlooked exposure pathway to terrestrial animals. While research has implemented the use of shoreline spiders to assess aquatic to terrestrial Hg transfer, it is unclear whether Hg sources, estimated from isotope ratios, can be successfully resolved to inform site assessments and remedy effectiveness. To examine aquatic to terrestrial Hg transfer, we collected shoreline spiders (Tetragnatha spp.) and aquatic insect larvae (suborder Anisoptera) across a mosaic of aquatic and shoreline habitats in the St. Louis River and Bad River, tributaries to Lake Superior. The fraction of industrial Hg in sediments was reflected in the δ(202)Hg values of aquatic dragonfly larvae and predatory fish, connecting benthic Hg sources to the aquatic food web. Shoreline spiders mirrored these aquatic Hg source signatures with highly positive correlations in δ(202)Hg between tetragnathids and dragonfly larvae (r(2) = 0.90). Further assessment of different spider taxa (i.e., araneids and pisaurids) revealed that differences in prey consumption and foraging strategies resulted in isotope differences, highlighting the importance of spider taxa selection for Hg monitoring efforts.
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spelling pubmed-105690302023-10-13 Mercury Isotope Values in Shoreline Spiders Reveal the Transfer of Aquatic Mercury Sources to Terrestrial Food Webs Janssen, Sarah E. Kotalik, Christopher J. Eagles-Smith, Collin A. Beaubien, Gale B. Hoffman, Joel C. Peterson, Greg Mills, Marc A. Walters, David M. Environ Sci Technol Lett [Image: see text] The transfer of aquatic contaminants, including mercury (Hg), to terrestrial food webs is an often-overlooked exposure pathway to terrestrial animals. While research has implemented the use of shoreline spiders to assess aquatic to terrestrial Hg transfer, it is unclear whether Hg sources, estimated from isotope ratios, can be successfully resolved to inform site assessments and remedy effectiveness. To examine aquatic to terrestrial Hg transfer, we collected shoreline spiders (Tetragnatha spp.) and aquatic insect larvae (suborder Anisoptera) across a mosaic of aquatic and shoreline habitats in the St. Louis River and Bad River, tributaries to Lake Superior. The fraction of industrial Hg in sediments was reflected in the δ(202)Hg values of aquatic dragonfly larvae and predatory fish, connecting benthic Hg sources to the aquatic food web. Shoreline spiders mirrored these aquatic Hg source signatures with highly positive correlations in δ(202)Hg between tetragnathids and dragonfly larvae (r(2) = 0.90). Further assessment of different spider taxa (i.e., araneids and pisaurids) revealed that differences in prey consumption and foraging strategies resulted in isotope differences, highlighting the importance of spider taxa selection for Hg monitoring efforts. American Chemical Society 2023-09-13 /pmc/articles/PMC10569030/ /pubmed/37840816 http://dx.doi.org/10.1021/acs.estlett.3c00450 Text en Not subject to U.S. Copyright. Published 2023 by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Janssen, Sarah E.
Kotalik, Christopher J.
Eagles-Smith, Collin A.
Beaubien, Gale B.
Hoffman, Joel C.
Peterson, Greg
Mills, Marc A.
Walters, David M.
Mercury Isotope Values in Shoreline Spiders Reveal the Transfer of Aquatic Mercury Sources to Terrestrial Food Webs
title Mercury Isotope Values in Shoreline Spiders Reveal the Transfer of Aquatic Mercury Sources to Terrestrial Food Webs
title_full Mercury Isotope Values in Shoreline Spiders Reveal the Transfer of Aquatic Mercury Sources to Terrestrial Food Webs
title_fullStr Mercury Isotope Values in Shoreline Spiders Reveal the Transfer of Aquatic Mercury Sources to Terrestrial Food Webs
title_full_unstemmed Mercury Isotope Values in Shoreline Spiders Reveal the Transfer of Aquatic Mercury Sources to Terrestrial Food Webs
title_short Mercury Isotope Values in Shoreline Spiders Reveal the Transfer of Aquatic Mercury Sources to Terrestrial Food Webs
title_sort mercury isotope values in shoreline spiders reveal the transfer of aquatic mercury sources to terrestrial food webs
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10569030/
https://www.ncbi.nlm.nih.gov/pubmed/37840816
http://dx.doi.org/10.1021/acs.estlett.3c00450
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