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Marine Ecology Progress Series

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MEPS 364:47-56 (2008)  -  DOI:

Habitat choice by marine zooplankton in a high-latitude ecosystem

Maria Fossheim1,2,*, Raul Primicerio1

1Norwegian College of Fishery Science, University of Tromsø, 9037 Tromsø, Norway
2Present address: Institute of Marine Research Tromsø, PO Box 6404, 9294 Tromsø, Norway

ABSTRACT: According to habitat choice theory, zooplanktonic prey should choose a depth habitat that maximizes food intake while minimizing predation risk. Body size affects competitive ability and vulnerability in zooplankton, thereby influencing the adaptive choice of depth habitat. To study size-dependent habitat choice in marine zooplankton, we sampled their vertical distributions on a fine-scale with an optical plankton counter (OPC) during a post-bloom condition in late spring on the continental shelf off North Norway. Taxonomic information was obtained from net samples. We found that small and large zooplankton segregated along the water column under resource heterogeneity, with large zooplankton aggregating in the resource-rich habitat together with predators of small zooplankton, in accordance with multi-trophic level habitat choice theory. These patterns of habitat use differ from summer vertical distributions documented in Norwegian waters, when the distribution of small and large zooplankton is reversed. To account for the discrepancy, we propose a new habitat choice model that considers the different predation regimes experienced in spring vs. summer.

KEY WORDS: Habitat selection · Competitive displacement · Size-selective predation · Predator avoidance · Habitat refuge

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Cite this article as: Fossheim M, Primicerio R (2008) Habitat choice by marine zooplankton in a high-latitude ecosystem. Mar Ecol Prog Ser 364:47-56.

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