A modeling approach to compare ΣPCB concentrations between congener-specific analyses

Gibson, Polly P.; Kraus, Johanna M.; Walters, David

doi:10.1002/ieam.1821

Cited by 3 publications

(1 citation statement)

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“…High‐resolution mass spectrometry (ALS Environmental) was used to analyze 2011 samples, while low‐resolution mass spectrometry (Battelle Memorial Institute) was used to analyze 2012 to 2013 samples, resulting in some differences in detection limits and in numbers of congeners analyzed between 2011 versus 2012 to 2013 (Supplemental Data, Table S4). Nonetheless, concentrations measured in 2011 and 2012 to 2013, respectively, are generally comparable . Lipids (as total extractable organics) in tissue samples were measured using the gravimetric method and reported as percentage of lipids on a wet weight basis.…”

Section: Methodsmentioning

confidence: 99%

Riparian spiders as sentinels of polychlorinated biphenyl contamination across heterogeneous aquatic ecosystems

Kraus

Gibson

Walters

2016

Enviro Toxic and Chemistry

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Riparian spiders are being used increasingly to track spatial patterns of contaminants in and fluxing from aquatic ecosystems. However, our understanding of the circumstances under which spiders are effective sentinels of aquatic pollution is limited. The present study tests the hypothesis that riparian spiders may be effectively used to track spatial patterns of sediment pollution by polychlorinated biphenyls (PCBs) in aquatic ecosystems with high habitat heterogeneity. The spatial pattern of ΣPCB concentrations in 2 common families of riparian spiders sampled in 2011 to 2013 generally tracked spatial variation in sediment ΣPCBs across all sites within the Manistique River Great Lakes Area of Concern (AOC), a rivermouth ecosystem located on the south shore of the Upper Peninsula, Manistique (MI, USA) that includes harbor, river, backwater, and lake habitats. Sediment ΣPCB concentrations normalized for total organic carbon explained 41% of the variation in lipid-normalized spider ΣPCB concentrations across 11 sites. Furthermore, 2 common riparian spider taxa (Araneidae and Tetragnathidae) were highly correlated (r > 0.78) and had similar mean ΣPCB concentrations when averaged across all years. The results indicate that riparian spiders may be useful sentinels of relative PCB availability to aquatic and riparian food webs in heterogeneous aquatic ecosystems like rivermouths where habitat and contaminant variability may make the use of aquatic taxa less effective. Furthermore, the present approach appears robust to heterogeneity in shoreline development and riparian vegetation that support different families of large web-building spiders. Environ Toxicol Chem 2017;36:1278-1286. Published 2016 Wiley Periodicals, Inc. on behalf of SETAC. This article is a US government work and, as such, is in the public domain in the United States of America.

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Section: Methodsmentioning

confidence: 99%