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

Harrod, Christopher and Grey, Jonathan (2006) Isotopic variation complicates analysis of trophic relations within the fish community of Plußsee:a small, deep, stratifying lake. Archiv für Hydrobiologie, 167 (1-4). pp. 281-299. ISSN 0003-9136

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Abstract

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 (> 10 km2) 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.

Item Type:
Journal Article
Journal or Publication Title:
Archiv für Hydrobiologie
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1104
Subjects:
ID Code:
74809
Deposited By:
Deposited On:
30 Jul 2015 14:20
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 09:18