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- W2890545672 abstract "Estimating the trophic position of predators in food webs using stable isotopes requires establishing a “baseline”, typically served by bivalves or snails. However, the frequent absence of such organisms in lakes leaves researchers in a difficult situation. Here we test the hypothesis that trophic position (TP) of largemouth bass (LB; Micropterus salmoides) in lakes can be estimated from δ 15 N of benthic organic material (BOM) in littoral surficial sediment. δ 15 N LB as a function of δ 15 N BOM was significant across 51 lakes with an R 2 of 0.84, supporting our hypothesis. In a subset of six lakes, the mean TP LB did not differ significantly when calculated using baselines of δ 15 N in BOM, unionid mussels (UN), gastropods (SN), or from a stable isotope mixing model. In a subset of 26 lakes, mean TP LB calculated from δ 15 N BOM and δ 15 N UN baselines were not significantly different, but TP LB calculated using δ 15 N BOM was not significantly correlated with TP LB calculated using δ 15 N UN . Although δ 15 N BOM should not be used interchangeably with δ 15 N UN as a baseline for estimating TP LB , δ 15 N BOM can be useful as a separate baseline where estimates of fish TP are needed in all study lakes given that mussels are frequently absent and BOM is always available for collection." @default.
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- W2890545672 date "2019-07-01" @default.
- W2890545672 modified "2023-10-06" @default.
- W2890545672 title "Use of stable isotopes in benthic organic material as a baseline for estimating fish trophic positions in lakes" @default.
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- W2890545672 doi "https://doi.org/10.1139/cjfas-2017-0381" @default.
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