Journal of Plankton Research Vol.23 no.3 pp.319-331, 2001
© Oxford University Press 2001
Annual Zooplankton Succession in Coastal NW Mediterranean Waters: The Importance of the Smaller Size Fractions
Institut De Ciències Del Mar, Csic, Departament De Biologia Marina I Oceanografia, Passeig Joan De Borbó S/n, 08039 Barcelona, Catalunya, Spain And 1 Institut Mediterrani D'estudis Avançats (csic-Uib), C/miquel Marqués 21, 07190 Esporles, Mallorca (illes Balears), Spain
Zooplankton abundance, biomass (biovolume) and taxonomic composition were studied within an annual cycle (August 1995October 1996) in the Bay of Blanes (northwest Mediterranean). Weekly zooplankton sampling included oblique tows made with a 200 µm JudayBogorov net, and vertical tows made with a 53 µm net, to adequately sample both mesoplankton and the smaller zooplankton fractions. Total zooplankton abundance showed high variability, lacking any clear seasonal pattern. However, the different species within the zooplankton community displayed a clear succession throughout the year. In general, cyclopoid copepods (Oithona spp.) and cladocerans (Peniliaavirostris) dominated the summer and autumn communities, whereas in winter and spring, calanoid copepods (Clausocalanus spp., Paracalanus sp. and Centropages typicus) were predominant. The zooplankton annual cycle in the Bay of Blanes does not resemble those of other Mediterraneanlittoral areas, probably due to the inherent particularity and variability associated with open coastal environments. On average, the abundance of organisms estimated with a traditional 200 µm JudayBogorov net was 8.1 times lower than the values obtained with a 53 µm net. Even if only organisms >200 µm collected in the 53 µm tows were considered, the total abundance within the 53 µm net was still 4.4 times higher than the estimates from the JudayBogorov net. These results suggest the need for accurate samplings of the entire zooplankton assemblage when characterizing the structure and dynamics of zooplanktonic communities.
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