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JPR Advance Access published online on January 24, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn002
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Magnitude of mesozooplankton variability: A case study from the Marginal Ice Zone of the Barents Sea in spring

Katarzyna Blachowiak-Samolyk1,, Slawek Kwasniewski1, Haakon Hop2 and Stig Falk-Petersen2

1 Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy St. 55, 81-712 Sopot, Poland 2 Norwegian Polar Institute, N-9296, Tromsø, Norway

Corresponding author: kasiab{at}iopan.gda.pl

Received on October 1, 2007; revised on January 2, 2008; accepted on January 3, 2008


  Abstract

Zooplankton was studied on eight stations in the marginal ice zone (MIZ) of the Barents Sea, in May 1999, along two transects across the ice edge. On each station physical background measurements and zooplankton samples were taken every 6 hours over a 24 hour period at five discrete depth intervals. Cluster analysis revealed separation of open water stations from all ice stations as well as high similarity level among replicates belonging to particular station. Based on 5 replicates per station, analysis of variance (ANOVA) confirmed significant differences (p<0.05) in abundances of the main mesozooplankton taxa among stations.

Relations between the zooplankton community and environmental parameters were established using RDA (CANOCO) analysis. In total, 55% of mesozooplankton variability within studied area was explained by 8 variables with significant conditional effects: depth stratum, fluorescence, temperature, salinity, bottom depth, latitude, bloom situation and ice concentration. GLM models supported supposition about clear and negative relationship between concentration of Oithona similis, and overall mesozooplankton diversity.

The analyses showed a dynamic relationship between mesozooplankton distribution and hydrological conditions on short-term scale. Furthermore, our study demonstrated that variability in the physical environment of dynamic MIZ of the Barents Sea has measurable effect on the Arctic pelagic ecosystem.

Key Words: mesozooplankton • variability • Barents Sea • MIZ

Corresponding Editor: Dr Roger Harris


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