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Isotopic variation complicates analysis of trophic relations within the fish community of Plußsee: a small, deep, stratifying lake

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons56716

Harrod,  Chris
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56696

Grey,  Jonathan
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Zitation

Harrod, C., & Grey, J. (2006). Isotopic variation complicates analysis of trophic relations within the fish community of Plußsee: a small, deep, stratifying lake. "Natural selection is ecology in action". Dedicated to Professor Dr. Winfried Lampert on the occasion of his 65th birthday, 281-299. doi:10.1127/0003-9136/2006/0167-0281.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-D86C-0
Zusammenfassung
Analysis of carbon and nitrogen stable isotopes has allowed freshwater ecologists to examine lake food webs in increasing detail. Many such studies have highlighted the existence of separate within-lake pelagic and benthic-littoral food webs but are typically conducted on large (> 10km²) lakes, whereas the majority of lakes are actually relatively small. We used stable isotope analysis (δ¹³C & δ¹⁵N) to examine trophic interactions between fish and their prey in Plußsee, as an example of a small, stratifying lake, and to determine whether separate pelagic/benthic-littoral food webs could be distinguished in such systems. Our results indicate that the Plußsee food web was complicated, and due to extensive intra-annual isotopic variation in zooplankton (e. g. cladoceran δ¹³C annual range = 25.6%), it may be impossible to definitively assign consumers from small, eutrophic stratified lakes to pelagic or benthic-littoral food webs. We present evidence that some components of the Plußsee food web (large bream) may be subsidised by carbon of methanogenic origin.