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Strategies of Gammarus pulex L. to cope with arsenic : Results from speciation analyses by IC–ICP-MS and XAS micro-mapping

Title data

Schaller, Jörg ; Koch, Iris ; Caumette, Guilhem ; Nearing, Michelle ; Reimer, Kenneth J. ; Planer-Friedrich, Britta:
Strategies of Gammarus pulex L. to cope with arsenic : Results from speciation analyses by IC–ICP-MS and XAS micro-mapping.
In: Science of the Total Environment. Vol. 530–531 (2015) . - pp. 430-433.
ISSN 0048-9697
DOI: https://doi.org/10.1016/j.scitotenv.2015.06.015

Abstract in another language

The invertebrate shredder Gammarus pulex L. is a key species for aquatic carbon turnover via litter decomposition and can thrive in high-arsenic (As) environments. To understand their strategies for coping with increased As concentrations while fulfilling their ecosystem functions, we analyzed the As concentration and speciation in their aquatic habitat and in leaves with heterotrophic biofilms as their natural food source. We also followed the As distribution and speciation on the cuticle and within the body of G. pulex by X-ray absorption spectroscopic imaging. Half of the total As on G. pulex was found to be associated with the cuticle but was not taken up. Removing this externally bound As yielded only arsenate in the wash solution which reflects the speciation of the surrounding aquatic phase and shows that this As does not undergo any biotransformation. The major pathway into the organism is suggested to be incorporation via food intake, but only very low amounts of As were taken up or translocated from the gut system to other tissues. In one of the main food sources, leaves, 68 % arsenate and 29 % monomethylarsenate were found. After ingestion into the gut system, up to 23 % of the more toxic arsenite was seen, but a substantial share was methylated to dimethylarsenate (46-56 %). Little arsenate and arsenite were found in the adjacent tissues. . Besides 76-80 % mono- and dimethylarsenate, 10-21 % of the As was complexed as As(III)-S species. G. pulex plays an important role in As cycling and our results indicate that it As translocation from the gut to other tissues is minimized , but a transformation to other As-species occurred.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER129159
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Aug 2016 08:07
Last Modified: 03 Aug 2016 08:07
URI: https://eref.uni-bayreuth.de/id/eprint/33798