Abstract
In the Baltic Sea, the climate change is expected to reduce salinity and increase temperature, and shift mesozooplankton communities towards dominance of small-bodied brackish-water taxa and cause a decline in large-bodied marine taxa. In this article, we analyse environmental monitoring data, collected in a coastal area in the northern Baltic Archipelago Sea during May–September, over the period of 1967–2013, for trends and relationship between mesozooplankton biomass anomalies, salinity and temperature. During the study period, the surface water temperature increased and salinity decreased. Since the mid-1980s, the community was dominated by small-bodied brackish-water taxa, whereas large-bodied calanoid copepods and marine taxa were mostly scarce or absent from the samples. The observed decline of marine taxa was related to the decline in salinity and, to some extent, to the increase of temperature. The brackish-water taxa were, for the most part, positively influenced by the temperature increase, although possibly other direct or indirect factors, not considered in this study, were also influencing the dynamics. This study adds to the existing knowledge of a possible ongoing shift in the food web structure towards smaller-sized species and emphasizes the significance of long-term environmental monitoring in understanding the dynamics in plankton communities.
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Acknowledgements
The salinity and temperature data used in this study were provided by Pekka Alenius (FMI). The plankton analyses during 1991–2013 were done by the Company Zwerver (http://www.zwerver.fi/).
Author contributions
KM, IV, and JH conceived, designed, and executed the study; KM analysed the data; KM, IV, and JH wrote the manuscript.
Funding
This work was supported by grants donated from the Baltic Sea Fund by the Finnish Foundation for Nature Conservation [to K.M] and from the Seili Fund by Turku University Foundation [Grant number 9303 to K.M].
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Handling editor: Jonne Kotta
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Mäkinen, K., Vuorinen, I. & Hänninen, J. Climate-induced hydrography change favours small-bodied zooplankton in a coastal ecosystem. Hydrobiologia 792, 83–96 (2017). https://doi.org/10.1007/s10750-016-3046-6
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DOI: https://doi.org/10.1007/s10750-016-3046-6