Large variation in periphyton δ13C and δ15N values in the upper Great Lakes: Correlates and implications

Andrew C. Camilleri; Tedy Ozersky

doi:10.1016/j.jglr.2019.06.003

Large variation in periphyton δ¹³C and δ¹⁵N values in the upper Great Lakes: Correlates and implications

Andrew C. Camilleri, Tedy Ozersky

Biology (Duluth)

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Stable isotope ratios of carbon (δ¹³C) and nitrogen (δ¹⁵N) are frequently used to examine food web structure. Despite periphyton's importance to lake food webs, little is known about spatial variation of periphyton δ¹³C and δ¹⁵N values in the Great Lakes. We present periphyton δ¹³C and δ¹⁵N values from 28 sites the upper Great Lakes, including Lake Superior, the north shore of Lake Michigan, and Green Bay. We also examined variation in periphyton isotope values relative to several water quality parameters (TP, TN, TKN, NO₃ ⁻, K_d) as well as periphyton C:N. There was a large range in both periphyton δ¹³C (range = 13.5‰) and δ¹⁵N (range = 10.2‰) among sites. Periphyton in more eutrophic sites had more depleted δ¹³C and more enriched δ¹⁵N compared to more oligotrophic sites. Our finding of high variability in periphyton isotope values in the Upper Great Lakes has implications for stable isotope-based reconstructions of food web structure.

Original language	English (US)
Pages (from-to)	986-990
Number of pages	5
Journal	Journal of Great Lakes Research
Volume	45
Issue number	5
DOIs	https://doi.org/10.1016/j.jglr.2019.06.003
State	Published - Oct 2019

Bibliographical note

Funding Information:
We would like to thank Sandra Brovold, Julia Halbur, John Koets, Taylor Velander, Kirill Shchapov, and Alex Christie for their contributions to laboratory and field work. Constructive comments from Dr. Robert Hecky and two anonymous reviewers helped to improve this manuscript. Funding for this project was provided by the University of Minnesota Duluth .

Publisher Copyright:
© 2019

Keywords

Food webs
Laurentian Great Lakes
Littoral
Periphyton
Spatial variation
Stable isotopes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jglr.2019.06.003

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abstract = "Stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) are frequently used to examine food web structure. Despite periphyton's importance to lake food webs, little is known about spatial variation of periphyton δ13C and δ15N values in the Great Lakes. We present periphyton δ13C and δ15N values from 28 sites the upper Great Lakes, including Lake Superior, the north shore of Lake Michigan, and Green Bay. We also examined variation in periphyton isotope values relative to several water quality parameters (TP, TN, TKN, NO3 −, Kd) as well as periphyton C:N. There was a large range in both periphyton δ13C (range = 13.5‰) and δ15N (range = 10.2‰) among sites. Periphyton in more eutrophic sites had more depleted δ13C and more enriched δ15N compared to more oligotrophic sites. Our finding of high variability in periphyton isotope values in the Upper Great Lakes has implications for stable isotope-based reconstructions of food web structure.",

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