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JPR Advance Access published online on March 3, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi010
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received August 30, 2004
Accepted February 22, 2005

Article

Post spring bloom community structure of pelagic copepods in the Disko Bay, Western Greenland

P. Thor 1*, T.G. Nielsen 2, P. Tiselius 1, T. Juul-Pedersen 2, C. Michel 3, E.F. Møller 4, K. Dahl 2, E. Selander 1, and S. Gooding 2

1 Göteborg University, Department of Marine Ecology, Kristineberg Marine Research Station, S-450 34 Fiskebäckskil, Sweden
2 National Environmental Research Institute, Department of Marine Ecology, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
3 Arctic Research Division, Freshwater Institute, Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, Manitoba, Canada
4 National Environmental Research Institute, Department of Marine Ecology, Frederiksborgvej 399, DK-4000 Roskilde, Denmark; University of Aarhus, Department of Marine Ecology, Finlandsgade 14, DK-8200 Århus, Denmark

* To whom correspondence should be addressed.
P. Thor, E-mail: peter.thor{at}kmf.gu.se


  Abstract

Community structure of pelagic copepods was investigated in the upper 200 meters in the Disko Bay, Western Greenland, during the post spring bloom period in June, 2001. This was the first study of the copepod community in West Greenland coastal waters sampled using smaller mesh sizes (50 µm as opposed to 200 µm). The mesozooplankton was dominated by copepods who constituted 82% of the total abundance and 95% of the total mesozooplankton biomass (>50 µm). Nauplii of Calanus, Pseudocalanus and Oithona dominated by number and the copepodites and adults were dominated by Oithona spp., Oncaea sp., Pseudocalanus sp., harpacticoids, Calanus finmarchicus, C. glacialis, and C. hyperboreus. Multivariate tests showed that the species/stage abundance composition of copepods changed significantly with depth. With one exception, all depth intervals showed unique significantly different compositions. Accordingly, the copepod community structure was influenced primarily by depth rather than by chlorophyll a concentration. Factors other than herbivorous grazing, such as omnivory, predator avoidance or association to marine snow aggregates of specific species, may have influenced the depth distribution of the total copepod community in the Disko Bay. Nevertheless, subsequent Pearson product moment correlations showed positive significant correlations between the vertical distribution of the three Calanus species and Pseudocalanus spp. and chlorophyll a concentrations, which points towards these species as prime components in the classic diatomcopepod food chain.


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