Abstract
The vertical distributions of populations of Calanus finmarchicus are described in three different fjord areas near Tromsø, northern Norway during May 1986. These localities (Malangen, Grøtsund and Balsfjorden) had characteristic differences in temperature, phytoplankton and population density of copepods. They probably are representative annual situations during the spring and summer period for coastal and fjord areas in northern Norway. Copepodite stage I and II C. finmarchicus are found in the surface waters (0–30 m) during a 24h cycle, while the other stages appear to have a different diel depth distribution in Malangen. Pronounced differences in the depth distribution of the various copepodite stages and adult females were found in Grøtsund and Balsfjorden during the same period of the day on 20 and 21 May. The tendency for vertical overlap among CI-CV was clearly less pronounced in an environment with low phytoplankton standing stock and high population density of copcpods. The patterns of vertical distribution are analysed by multidimentional scaling (MDS) and it is evident that the distribution pattern of C. finmarchicus is different at each locality. These preliminary results, are discussed in relation to ontogenetic vertical migration and aspects of resource partitioning and the possible importance of vertical separation for reducing competitive interactions between the different life stages of C. finmarchicus.
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Tande, K.S. (1988). An evaluation of factors affecting vertical distribution among recruits of Calanus finmarchicus in three adjacent high-latitude localities. In: Boxshall, G.A., Schminke, H.K. (eds) Biology of Copepods. Developments in Hydrobiology, vol 47. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3103-9_10
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DOI: https://doi.org/10.1007/978-94-009-3103-9_10
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