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

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons56898

Santer,  Barbara
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56943

Sommerwerk,  Nike
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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santer_2006.pdf
(Verlagsversion), 383KB

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Zitation

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.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-D872-F
Zusammenfassung
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.