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Compositional and interlake variability of zooplankton affect baseline stable isotope signatures (2003)
| Content Provider | CiteSeerX |
|---|---|
| Author | Matthews, Blake Mazumder, Asit |
| Abstract | Zooplankton are commonly used to establish a baseline isotopic signature for pelagic production in lakes. Our objective was to evaluate this approach by quantifying among-lake and within-lake variability of d13C and d15N for different taxa of pelagic zooplankton. We measured the d13C and d15N of Daphnia, Holopedium, and calanoid copepods from four lakes sampled from June to November 2001 and from eight additional lakes sampled once in midsummer. In the four lakes with temporal sampling, within-lake differences due to taxonomic grouping accounted for 36.7 % of the variance in d15N and 41.7 % of the variance in d13C. Among all lakes, the d15N of calanoid copepods was on average 2.55 ‰ and 2.44 ‰ higher than Daphnia or Holopedium, respectively, whereas the d13C of calanoid copepods was 2.19 ‰ and 2.23 ‰ lower than Daphnia or Holopedium, respectively. If 15N fractionation is similar among species, the differences in d15N suggest that calanoid copepods either feed at a higher trophic position in the food web or they have a consistently higher baseline d15N signature than Daphnia or Holopedium among lakes. Differences in d13C suggest that zooplankton taxa in the pelagia of lakes have different food sources. We conclude that species composition and feeding behaviors of the zooplankton community should be considered before making among-lake comparisons of food web structure. We show that Daphnia is a useful isotopic baseline for organisms that rely on primary production in lakes. |
| File Format | |
| Journal | Limnol. Oceanogr |
| Language | English |
| Publisher Date | 2003-01-01 |
| Access Restriction | Open |
| Subject Keyword | Calanoid Copepod Baseline Stable Isotope Signature Temporal Sampling Primary Production Within-lake Variability Among-lake Comparison Baseline D15n Signature Zooplankton Community Specie Composition Trophic Position Additional Lake Zooplankton Taxon Food Web Structure Different Food Source Baseline Isotopic Signature Food Web Useful Isotopic Baseline Different Taxon Pelagic Production Pelagic Zooplankton Within-lake Difference |
| Content Type | Text |
| Resource Type | Article |
