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Marine Ecology Progress Series

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MEPS 555:49-64 (2016)  -  DOI:

Seasonal vertical strategies in a high-Arctic coastal zooplankton community

Kanchana Bandara1,*, Øystein Varpe2,3, Janne E. Søreide2, Jago Wallenschus2, Jørgen Berge2,4, Ketil Eiane

1Faculty of Biosciences and Aquaculture, Nord University, 8049 Bodø, Norway
2The University Centre in Svalbard (UNIS), 9171 Longyearbyen, Norway
3Akvaplan-niva, Fram Centre, 9296 Tromsø, Norway
4Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, 9037 Tromsø, Norway
*Corresponding author:

ABSTRACT: We studied the larger (>1000 µm) size fraction of zooplankton in an Arctic coastal water community in Billefjorden, Svalbard (78°40’N), Norway, in order to describe seasonal vertical distributions of the dominant taxa in relation to environmental variability. Calanus spp. numerically dominated the herbivores; Aglantha digitale, Mertensia ovum, Beroë cucumis, and Parasagitta elegans were the dominant carnivores. Omnivores and detritivores were numerically less important. Descent to deeper regions of the water column (>100 m) between August and October, and ascent to the shallower region (<100 m) between November and May was the overall seasonal pattern in this zooplankton community. In contrast to other groups, P. elegans did not exhibit pronounced vertical migrations. Seasonal vertical distributions of most species showed statistical associations with the availability of their main food source. The vertical distribution of later developmental stages of Calanus spp. was inversely associated with fluorescence, indicating that they descended from the shallower region while it was still relatively productive, and ascended before the primary production had started to increase. Strong associations between the vertical distributions of secondary consumer M. ovum and Calanus spp., and tertiary consumer B. cucumis and M. ovum indicated that these carnivores seasonally followed their prey through the water column. We conclude that seasonal vertical migrations are a widespread trait in the high Arctic community studied, and predator-prey interactions seem particularly central in shaping the associations between the seasonal vertical strategies of adjacent trophic levels.

KEY WORDS: Seasonal vertical migration · Food availability · Trophic interactions · Pelagic environments · Predator-prey interactions

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Cite this article as: Bandara K, Varpe Ø, Søreide JE, Wallenschus J, Berge J, Eiane K (2016) Seasonal vertical strategies in a high-Arctic coastal zooplankton community. Mar Ecol Prog Ser 555:49-64.

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