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Long-term trends and regional differences of phytoplankton in large Finnish lakes

  • EUROPEAN LARGE LAKES II
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Abstract

Major nutrients (N and P) and phytoplankton from 19 large lakes from southern (61°) to northern (69°) Finland were analyzed to detect long-term trends and regional differences. The data sets from June, July and August cover the period from the early 1980s to the present. Altogether >700 phytoplankton and >4000 N, P and Chl a results were used for the study. In 40% of the lakes, the total phosphorus (TP) concentration decreased significantly and in >25% of the lakes a significant reduction was found in the total nitrogen (TN) concentration. At the same time, the phytoplankton biomass declined only in 15% of the lakes and the long-term trends in chlorophyll a more often increased than decreased. A clear gradient from southern to northern Finland and western to eastern Finland was found in the phytoplankton biomass. During the study period, the biomasses of cyanobacteria and centrales (diatoms) decreased whilst there was an increase in the biomass of pennales (diatoms) in one-third of the lakes. The proportion of chlorophytes in the total biomass also increased in >20% of the study lakes. In southern and western Finland, the total biomass and the contribution of cyanobacteria were higher. Centrales made a higher contribution to the total biomass in the north. Pennales and chlorophytes were less abundant and chrysophytes more abundant in the east. Differences in the community composition reflected the gradients in the total nutrients, and particularly in TP. The observations support the assumed role of phosphorus as the key limiting nutrient in large Finnish lakes irrespective of lake′s location. The N:P ratio proved to be a poor predictor of cyanobacteria occurrence in the study lakes.

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Authors and Affiliations

  1. Lammi Biological Station, University of Helsinki, Helsinki, Finland

    Lauri Arvola & Tiina Tulonen

  2. Finnish Environment Institute, Helsinki, Finland

    Marko Järvinen

Authors
  1. Lauri Arvola
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  2. Marko Järvinen
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  3. Tiina Tulonen
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Correspondence to Lauri Arvola.

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Guest editors: T. Blenckner, T. Nöges, L. Tranvik, K. Pettersson, R. Naddafi / European Large Lakes II. Vulnerability of large lake ecosystems - Monitoring, management and measures

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Arvola, L., Järvinen, M. & Tulonen, T. Long-term trends and regional differences of phytoplankton in large Finnish lakes. Hydrobiologia 660, 125–134 (2011). https://doi.org/10.1007/s10750-010-0410-9

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  • DOI: https://doi.org/10.1007/s10750-010-0410-9

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