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Summary: ORIGINAL ARTICLE
Vertical distribution of Calanus spp. and Metridia longa at four Arctic
locations
MALIN DAASE1
, KETIL EIANE1,3
, DAG L. AKSNES2
& DANIEL VOGEDES1
1
The University Centre in Svalbard, Longyearbyen, Norway, 2
Department of Biology, University of Bergen, Bergen, Norway,
and 3
The University College in Bodø, Norway
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 southÁnorth
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.
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