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Vertical distribution of Calanus spp. and Metridia longa at four Arctic locations
Daase, M.; Eiane, K.; Aksnes, D.L.; Vogedes, D. (2008). Vertical distribution of Calanus spp. and Metridia longa at four Arctic locations. Mar. Biol. Res. 4(3): 193-207. dx.doi.org/10.1080/17451000801907948
In: Marine Biology Research. Taylor & Francis: Oslo; Basingstoke. ISSN 1745-1000, more
Peer reviewed article  

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Keywords
    Mortality; Optics; Vertical distribution; Metridia longa (Lubbock, 1854) [WoRMS]; Marine

Authors  Top 
  • Daase, M.
  • Eiane, K.
  • Aksnes, D.L.
  • Vogedes, D.

Abstract
    We investigated the vertical distribution of Calanus finmarchicus, C. glacialis, C. hyperboreus and Metridia longa at four locations around the archipelago of Svalbard in autumn. The older and larger copepodites of Calanus spp. were generally located deeper in the water column. Differences in vertical distribution between stations partly reflected a south-north gradient in developmental progress with higher abundance of older stages in the southern locations. The C. finmarchicus and M. longa observations were consistent with the hypothesis that the developmental stages distributed according to certain preferences for light intensity, and different optical properties at the four locations are likely to have affected the vertical distributions. Diel vertical migration was only observed for older developmental stages of M. longa while young stages of M. longa remained in deep waters both day and night. A mortality index indicated that non-migrating Calanus spp. suffered higher mortality than migrating M. longa.

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