Change search
ReferencesLink to record
Permanent link

Direct link
Species-specific separation of lake plankton reveals divergent food assimilation patterns in rotifers
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
2014 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 59, no 6, 1257-1265 p.Article in journal (Refereed) Published
Abstract [en]

The analysis of functional groups with a resolution to the individual species level is a basic requirement to better understand complex interactions in aquatic food webs. Species-specific stable isotope analyses are currently applied to analyse the trophic role of large zooplankton or fish species, but technical constraints complicate their application to smaller-sized plankton. We investigated rotifer food assimilation during a short-term microzooplankton bloom in the East African soda lake Nakuru by developing a method for species-specific sampling of rotifers. The two dominant rotifers, Brachionus plicatilis and Brachionus dimidiatus, were separated to single-species samples (purity >95%) and significantly differed in their isotopic values (4.1 parts per thousand in delta C-13 and 1.5 parts per thousand in delta N-15). Bayesian mixing models indicated that isotopic differences were caused by different assimilation of filamentous cyanobacteria and particles A main difference was that the filamentous cyanobacterium Arthrospira fusiformis, which frequently forms blooms in African soda lakes, was an important food source for the larger-sized B.plicatilis (48%), whereas it was hardly ingested by B.dimidiatus. Overall, A.fusiformis was, relative to its biomass, assimilated to small extents, demonstrating a high grazing resistance of this species. In combination with high population densities, these results demonstrate a strong potential of rotifer blooms to shape phytoplankton communities and are the first in situ demonstration of a quantitatively important direct trophic link between rotifers and filamentous cyanobacteria.

Place, publisher, year, edition, pages
2014. Vol. 59, no 6, 1257-1265 p.
Keyword [en]
size fractionation, cyanobacteria, Lake Nakuru, zooplankton, stable isotopes, dietary sources, Brachionus plicatilis
National Category
Biological Sciences
Research subject
Marine Ecology
URN: urn:nbn:se:su:diva-103259DOI: 10.1111/fwb.12345ISI: 000333964700012OAI: diva2:719369


Available from: 2014-05-23 Created: 2014-05-12 Last updated: 2016-04-22Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Burian, Alfred
By organisation
Department of Ecology, Environment and Plant Sciences
In the same journal
Freshwater Biology
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 88 hits
ReferencesLink to record
Permanent link

Direct link