NDLI: Selective predation on zooplankton by pelagic Arctic charr, Salvelinus alpinus, in six subarctic lakes

Content Provider	Springer Nature Link
Author	Skoglund, S. Knudsen, R. Amundsen, P. A.
Copyright Year	2013
Abstract	Selective predation by planktivore fish appears to be an important regulatory factor of zooplankton communities, potentially causing large changes in species composition and size distributions within populations. In this study, prey preferences and size-selective predation on zooplankton by Arctic charr were examined in six subarctic lakes with Arctic charr as the dominant pelagic fish species. Most of the lakes had a zooplankton community dominated by copepods (Cyclops scutifer and Eudiaptomus graciloides), but the pelagic charr evidently selected cladoceran species (Bythotrephes longimanus, Daphnia sp. and Bosmina sp.), likely because the copepods have a higher mobility and evasiveness than the cladocerans. Furthermore, a strong size selection was also revealed for both Bosmina sp. and Daphnia sp., as individual prey from Arctic charr stomachs were exclusively larger than individuals sampled in the environment. Additionally, visibility due to size, morphology and pigmentation (egg-carrying females) was also a major factor for the selection of zooplankton prey. In conclusion, Arctic charr was found to be highly selective on zooplankton both in respect to species composition and individual size of Bosmina sp. and Daphnia sp.
Starting Page	849
Ending Page	855
Page Count	7
File Format	PDF
ISSN	00329452
Journal	Journal of Ichthyology
Volume Number	53
Issue Number	10
e-ISSN	15556425
Language	English
Publisher	Springer US
Publisher Date	2013-12-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	zooplankton selective predation diet top-down regulation Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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