Factors describing the distribution of the zooplankton community in the Gulf of Finland in the context of interactions between native and introduced predatory cladoceransAuthor(s): Arno Põllumäe | Jonne Kotta
Journal: Oceanologia ISSN 0078-3234
Volume: 49; Issue: 2; Start page: 277; Date: 2007;
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.