MEPS 372:231-241 (2008)  -  DOI: https://doi.org/10.3354/meps07721

New perspectives on fish movement: kernel and GAM smoothers applied to a century of tagging data on coastal Atlantic cod

Sigurd Heiberg Espeland1, Esben Moland Olsen2, Halvor Knutsen2, Jakob Gjøsæter2, Didrik Danielssen2, 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: Tagging–recovery studies have been used successfully on many occasions, and the data analysed in a variety of ways with respect to fish movement. Here we provide a synoptic account of useful statistical techniques for delimiting area utilization and movement patterns of a population of individuals. We focus specifically on kernel smoothing for population utilization distribution and generalized additive models for temporal movement patterns. Furthermore, we use these 2 techniques to re-analyse data from tagging studies on coastal Atlantic cod Gadus morhua, shedding new light on one of the underlying mechanisms determining the population structure of the coastal cod along the Norwegian Skagerrak coast. Cod were found to use small areas. On average 25% of a population used areas smaller than 10 km2, while 95% of a population used areas smaller than 160 km2. The movements displayed were fjord-limited and predominantly within the bounds of the population’s home range. By re-analysing existing data on neutral genetic markers, we show that the cross-distance of the area utilized was smaller than the distance over which pair-wise genetic differences appear.


KEY WORDS: Atlantic cod · Gadus morhua · Population home range · Population density distribution · Local populations · Stock structure · Kernel model · GAM


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Cite this article as: Espeland SH, Olsen EM, Knutsen H, Gjøsæter J, Danielssen D, Stenseth NC (2008) New perspectives on fish movement: kernel and GAM smoothers applied to a century of tagging data on coastal Atlantic cod. Mar Ecol Prog Ser 372:231-241. https://doi.org/10.3354/meps07721

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