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Marine Ecology Progress Series

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MEPS 405:29-37 (2010)  -  DOI:

Diel vertical migration patterns in juvenile cod from the Skagerrak coast

Sigurd Heiberg Espeland1, Adine Guldborg Thoresen1, Esben Moland Olsen2, Leif Christian Stige1, Halvor Knutsen2, Jakob Gjøsæter2, Nils Christian Stenseth1,2,*

1Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway
2Institute of Marine Research Flødevigen, 4817 His, Norway

ABSTRACT: We demonstrated a clear year-round diel vertical migration pattern (DVM) of small (26 to 45 cm) Skagerrak coastal cod Gadus morhua on a small geographic scale. Generalized additive models (GAMs) were used to make inferences about depth movements from a large data set of repeated depth measurements of cod fitted with acoustical tags. The general pattern in vertical behaviour was closely linked to sunrise and sunset, and the timing varied with the length of the day. The absolute magnitude of vertical movement was seasonally variable and probably influenced by temperature and food availability. Cod constantly selected deeper residence depths during the day than at night, and during winter than in summer. This study uses flexible models to make generalisations of the varying nature of the diel vertical migration patterns in juvenile coastal cod.

KEY WORDS: Diel vertical migration · DVM · Generalized additive models · GAM · Coastal cod · Gadus morhua

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Cite this article as: Espeland SH, Thoresen AG, Olsen EM, Stige LC, Knutsen H, Gjøsæter J, Stenseth NC (2010) Diel vertical migration patterns in juvenile cod from the Skagerrak coast. Mar Ecol Prog Ser 405:29-37.

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