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- W4291162120 abstract "Incorporating organismal hydrogen (δ 2 H or δD) and oxygen (δ 18 O) stable isotope ratios into aquatic food web research can help elucidate relative reliance on shoreline inputs and/or feeding at different trophic levels ; however, their interpretation is complicated by the fact that aquatic organisms derive hydrogen and oxygen from both their diet and the ambient water in which they reside. We examined spatial and seasonal patterns in δ 2 H and δ 18 O of field-collected water and small-bodied fishes. Samples were gathered from nearshore Lake Michigan, a dynamic region of a large, increasingly oligotrophic freshwater lake. We examined seasonal and spatial δ 2 H and δ 18 O values of surface and bottom water, and compared spatial δ 2 H and δ 18 O values of young-of-year yellow perch ( Perca flavescens ) and seasonal δ 2 H and δ 18 O values of round goby ( Neogobius melanostomus ). Nearshore δ 2 H and δ 18 O water values were more variable than previously-described offshore values. Variation in nearshore water δ 2 H and δ 18 O values was likely related to differential precipitation and/or discharges from tributaries, and there may be a surface dilution effect which led to lower δ 18 O values in nearshore surface waters than bottom waters. In our study, fish tissue δ 2 H and δ 18 O also varies more spatially than seasonally, and some findings suggest that fish tissue δ 2 H may reflect feeding at higher trophic levels. Though characteristics of the study system affect their interpretation, we suggest that δ 2 H and δ 18 O can be another tool to assess food web structure, with δ 2 H in particular having potential to resolve questions when δ 13 C or δ 15 N are inconclusive." @default.
- W4291162120 created "2022-08-13" @default.
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- W4291162120 date "2022-10-01" @default.
- W4291162120 modified "2023-10-17" @default.
- W4291162120 title "Variability in fish and water hydrogen and oxygen stable isotope values in the nearshore region of a large water body" @default.
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- W4291162120 doi "https://doi.org/10.1016/j.jglr.2022.08.006" @default.
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