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Oceanologia  2007 

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

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

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Abstract:

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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