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Assessing diet of the non-indigenous predatory cladoceran Cercopagis pengoi using stable isotopes
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Systems Ecology.
2012 (English)In: Journal of Plankton Research, ISSN 0142-7873, E-ISSN 1464-3774, Vol. 34, no 5, 376-387 p.Article in journal (Refereed) Published
Abstract [en]

In the Baltic Sea, the predatory cladoceran Cercopagis pengoi is a non-indigenous species that has potential to compete for mesozooplankton with pelagic zooplanktivorous fish. To understand the extent of diet overlap with these fishes in a coastal area of the northern Baltic proper, we studied the feeding of C. pengoi using stable C-13 and N-15 isotope signatures of the predator and possible prey. Feasible combinations of sources were estimated in two ways: (i) with the IsoSource mixing model, and (ii) temporal-tracking analysis. Further, contribution of different prey was related to ambient zooplankton composition to gauge selectivity. The modelling results indicate that C. pengoi is an opportunistic generalist predator with a positive selection towards older copepodites (CIVVI) of Acartia spp. and Eurytemora affinis, which also have the greatest contribution to its diet. Positive selection towards podonid Cladocera is also likely. In contrast, evidence for extensive feeding on microzooplankton was inconclusive, and bosminids were not found to be an important prey in the zooplankton assemblages studied. As the derived diet of C. pengoi overlaps greatly with that of zooplanktivorous fish, food competition between these zooplanktivores is possible.

Place, publisher, year, edition, pages
2012. Vol. 34, no 5, 376-387 p.
Keyword [en]
mixing models, temporal-tracking analysis, selectivity, foodweb interactions, zooplankton
National Category
Biological Sciences Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-76049DOI: 10.1093/plankt/fbs008ISI: 000302299400003OAI: diva2:525785
3Available from: 2012-05-09 Created: 2012-05-08 Last updated: 2012-08-27Bibliographically approved
In thesis
1. Trophic interactions and behaviour: Studies relevant to a Baltic Sea biomanipulation
Open this publication in new window or tab >>Trophic interactions and behaviour: Studies relevant to a Baltic Sea biomanipulation
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The main theme of this thesis is the interactions of animals with the environment and each other. The thesis was written within the framework of a biomanipulation project “Pikeperch in Himmerfjärden”. With the aim to investigate possible trophic pit-falls, give the manipulation the best possible start, and find ways to monitor the progression of the manipulation. In Paper I the diet of the invader cladoceran Cercopagis pengoi is analysed with stable isotopes; conducted prior to stocking. C.pengoi has a preference for large copepods, indicating possible competition with fish. Paper II investigates the behavioural differences between pikeperch fingerlings reared in different environments (pond vs. tank). Results suggest that fish reared in semi-natural ponds are more likely to survive directly after stocking. In Paper III and IV, the diel vertical migrations (DVM) of copepods are in focus. In Paper III the migrations of two copepod species: Acartia spp. and Eurytemora affinis are studied over season and life stage. The amplitude of migration was found to increase with ontogeny for both species, indicating evasion of visual predators. Paper IV examines the varying migratory patterns of adult female E. affinis finding that these animals migrate more actively when feeding conditions deteriorate and growth decreases. The overall conclusions of the thesis are that behavioural, not only direct trophic interactions are key when studying ecosystems.

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2012. 31 p.
zooplankton, non-indigenous species, selectivity; food web, rearing environment, fish stocking, Sander lucioperca, diel vertical migration, ontogeny, ovigerous
National Category
Research subject
Marine Ecology
urn:nbn:se:su:diva-79075 (URN)978-91-7447-567-8 (ISBN)
Public defence
2012-10-05, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (English)

At the time of the doctoraldefense, the following papers were unpublished and had a status asfollows: Paper2: In press. Paper 4: Manuscript.

Available from: 2012-09-13 Created: 2012-08-26 Last updated: 2012-08-27Bibliographically approved

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Holliland, Per B.Gorokhova, Elena
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