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  1. Article

    Open Access

    Seasonal variability in the grazing potential of the invasive amphipod Gammarus tigrinus and the native amphipod Gammarus salinus (Amphipoda: Crustacea) in the northern Baltic Sea

    Mesograzers are known to reduce the biomass of their host plant and modify the structure of the whole macrophyte community in many ecosystems. Thus, the introduction of an efficient mesograzer may destabilize ...

    Helen Orav-Kotta, Jonne Kotta, Kristjan Herkül, Ilmar Kotta… in Biological Invasions (2009)

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  2. No Access

    Article

    Response of zoobenthic communities to changing eutrophication in the northern Baltic Sea

    The relationships between the concentration of water nutrients and the biomass of benthic invertebrate feeding guilds were examined at 46 sites in the northern Baltic Sea during 1993–2003. We analysed whether ...

    Jonne Kotta, Velda Lauringson, Ilmar Kotta in Hydrobiologia (2007)

  3. No Access

    Chapter and Conference Paper

    Response of zoobenthic communities to changing eutrophication in the northern Baltic Sea

    The relationships between the concentration of water nutrients and the biomass of benthic invertebrate feeding guilds were examined at 46 sites in the northern Baltic Sea during 1993–2003. We analysed whether ...

    Jonne Kotta, Velda Lauringson, Ilmar Kotta in Biodiversity in Enclosed Seas and Artifici… (2007)

  4. Article

    Seasonal changes in situ grazing of the mesoherbivores Idotea baltica and Gammarus oceanicus on the brown algae Fucus vesiculosus and Pylaiella littoralis in the central Gulf of Finland, Baltic Sea

    Jonne Kotta, Helen Orav-Kotta, Tiina Paalme, Ilmar Kotta, Henn Kukk in Hydrobiologia (2006)

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  5. Article

    Ecological consequences of biological invasions: three invertebrate case studies in the north-eastern Baltic Sea

    Population dynamics and ecological impacts of the cirriped Balanus improvisus, the polychaete Marenzelleria neglecta and the cladoceran Cercopagis pengoi were investigated in the north-eastern Baltic Sea. After a...

    Jonne Kotta, Ilmar Kotta, Mart Simm, Ain Lankov… in Helgoland Marine Research (2006)

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  6. Article

    Distribution and population characteristics of the alien talitrid amphipod Orchestia cavimana in relation to environmental conditions in the Northeastern Baltic Sea

    The talitrid amphipods were found for the first time in the Northeastern Baltic Sea in 1999. Orchestia cavimana inhabited damp wracks cast up on shore within a 200 m area of Saaremaa Island. In the following year...

    Kristjan Herkül, Jonne Kotta, Ilmar Kotta in Helgoland Marine Research (2006)

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  7. No Access

    Article

    Factors controlling long-term changes of the eutrophicated ecosystem of Pärnu Bay, Gulf of Riga

    Phytoplankton, mesozooplankton, mysids and fish larvae were studied during 15–29 annual cycles measured weekly to monthly in Pärnu Bay, the Gulf of Riga. The monthly variability of the biological data was rela...

    Jonne Kotta, Mart Simm, Ilmar Kotta, Inga Kanošina, Kalle Kallaste… in Hydrobiologia (2004)

  8. No Access

    Chapter and Conference Paper

    Factors controlling long-term changes of the eutrophicated ecosystem of Pärnu Bay, Gulf of Riga

    Phytoplankton, mesozooplankton, mysids and fish larvae were studied during 15–29 annual cycles measured weekly to monthly in Pärnu Bay, the Gulf of Riga. The monthly variability of the biological data was rela...

    Jonne Kotta, Mart Simm, Ilmar Kotta, Inga Kanošina… in Biology of the Baltic Sea (2004)