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Seasonal and long-term variations in the body size of planktonic copepods in the northern Baltic Sea

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Seasonal and long-term variations in the body size of planktonic copepods were studied in the northern Baltic Sea. The influence of temperature, salinity and phytoplankton concentration to the body size of Eurytemora affinis, Acartia bifilosa and Limnocalanus macrurus (Calanoida) was examined at three sea areas, differing in their hydrographical and trophic conditions (an archipelago area and an enclosed bay on the SW coast of Finland in 1992 and at an open sea station in the Gulf of Bothnia in 1991). There was an inverse relationship between copepod body length and temperature, while there was a direct effect of phytoplankton concentration. According to multiple regression analysis, the relative importance of these factors varied according to species, developmental stage and study area. In the archipelago area, copepod body size was mainly determined by temperature, while in the open Gulf of Bothnia, phytoplankton concentration was usually more important. Interannual variation in the summer body length of E. affinis and A. bifilosa was examined using samples collected over 18 years (1967 to 1984) in the archipelago area. In this analysis, the inverse relationship between water temperature and copepod body size disappeared; in E. affinis the average female length correlated positively with summer temperature. We suggest that the length and timing of the study period greatly influence the investigator's view of the factors regulating copepod body size.

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Author notes

  1. M. Viitasalo

    Present address: Danish Institute for Fisheries Research, Charlottenlund Castle, DK-2920, Charlottenlund, Denmark

Authors and Affiliations

  1. Finnish Institute of Marine Research, P.O. Box 33, FIN-00931, Helsinki, Finland

    M. Viitasalo

  2. Tvärminne Zoological Station, University of Helsinki, FIN-10900, Hanko, Finland

    M. Koski

  3. Department of Limnology and Environmental Protection/Limnology, University of Helsinki, P.O. Box 27, FIN-00014, Helsinki, Finland

    K. Pellikka

  4. Swedish Environmental Protection Agency, S-17185, Solna, Sweden

    S. Johansson

Authors
  1. M. Viitasalo
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  2. M. Koski
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  3. K. Pellikka
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  4. S. Johansson
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Viitasalo, M., Koski, M., Pellikka, K. et al. Seasonal and long-term variations in the body size of planktonic copepods in the northern Baltic Sea. Marine Biology 123, 241–250 (1995). https://doi.org/10.1007/BF00353615

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  • DOI: https://doi.org/10.1007/BF00353615

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