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  Food niches of cyclopoid copepods in eutrophic Plußsee determined by stable isotope analysis

Santer, B., Sommerwerk, N., & Grey, J. (2006). Food niches of cyclopoid copepods in eutrophic Plußsee determined by stable isotope analysis. "Natural selection is ecology in action". Dedicated to Professor Dr. Winfried Lampert on the occasion of his 65th birthday, 301-316. doi:10.1127/0003-9136/2006/0167-0301.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D872-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D873-D
Genre: Journal Article

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 Creators:
Santer, Barbara1, Author              
Sommerwerk, Nike1, Author              
Grey, Jonathan1, Author              
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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Free keywords: δ¹³C; δ¹⁵N; trophic position; competition; plankton
 Abstract: Feeding studies have suggested interspecific differences in the food sources and trophic position of cyclopoid copepod species. We measured δ¹³C and δ¹⁵N of five sympatric cyclopoid copepod species and of bulk POM from a eutrophic lake over a one-year period, to determine if stable isotope derived-data from the field supported the hypotheses from feeding studies. Cyclops abyssorum and C. vicinus differed significantly in δ¹⁵N but not in δ¹³C, inferring assimilation from similar carbon sources but differentiation in their trophic position. Cyclops abyssorum δ¹⁵N typically was 1-2% higher than C. vicinus, suggesting a more predatory feeding mode compared to its congener. The summer species Mesocyclops leuckarti, Thermocyclops oithonoides and Diacyclops bicuspidatus exhibited considerable differences in δ¹³C. The lower δ¹³C of the hypolimnetic D. bicuspidatus compared to the two epilimnetic species indicates a food niche differentiation by vertical separation. All copepod δ¹³C and δ¹⁵N signatures showed seasonal fluctuations, with low values in winter and high values in summer. The δ¹³C of seston was generally higher than copepod δ¹³C. We regard selective feeding from the bulk POM, spatial separation of feeding and assimilation of ¹³C depleted food sources responsible for this phenomenon.

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Language(s): eng - English
 Dates: 2006-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 291475
DOI: 10.1127/0003-9136/2006/0167-0301
Other: 2499/S 38576
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Title: "Natural selection is ecology in action". Dedicated to Professor Dr. Winfried Lampert on the occasion of his 65th birthday
Source Genre: Issue
 Creator(s):
Boersma, Maarten1, Editor            
Santer, Barbara1, Editor            
Affiliations:
1 Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547            
Publ. Info: -
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 301 - 316 Identifier: -

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Title: Archiv für Hydrobiologie
  Alternative Title : Arch. Hydrobiol.
Source Genre: Journal
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Pages: - Volume / Issue: 167 (1-4) Sequence Number: - Start / End Page: - Identifier: ISSN: 0003-9136