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Factors describing the distribution of the zooplankton community in the Gulf of Finland in the context of interactions between native and introduced predatory cladocerans

Author(s): Arno Põllumäe | Jonne Kotta

Journal: Oceanologia
ISSN 0078-3234

Volume: 49;
Issue: 2;
Start page: 277;
Date: 2007;
Original page

Keywords: Baltic | Mesozooplankton | Non-indigenous | Food web | Predation

Mesozooplankton communities were studied monthlyat six sites in the Gulf of Finland during six ice-free seasons.The abundances of different zooplankton taxa were related totemperature, salinity, eutrophication level (total nitrogen andphosphorus), phytoplankton Chl a and density of predatorycladocerans, including the non-indigenous Cercopagis pengoiand the native Leptodora kindtii. The results indicated thatvariability in the zooplankton communities was correlated notonly with predation by mesozooplankton but also with bottom-upeffects. Predation by the non-indigenous C. pengoi may significantlyaffect the dynamics of Cladocera and Rotatoria in the Gulf ofFinland during the summer season.
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