Abstract
The abundance, growth, and grazing loss rates of picophytoplankton were investigated in August 2002 in Barguzin Bay, Lake Baikal. Water samples for incubation were taken once at a near-shore station and twice at an offshore station. Contributions of picophytoplankton to total phytoplankton were high (56.9–83.9%) at the offshore station and low (5.8–6.8%) at the near-shore station. The picophytoplankton community in the offshore station comprised mainly phycoerythrin (PE)-rich cyanobacteria, with eukaryotic picophytoplankton being less abundant. In contrast, as well as PE-rich cyanobacteria and eukaryotic picophytoplankton, phycocyanin (PC)-rich cyanobacteria were found in the near-shore station. At the offshore station, growth and grazing loss rates on 25 August were 0.56 and 0.43 day−1, respectively, and on 29 August, 0.69 and 0.83 day−1, respectively. At the near-shore station, growth and grazing loss rates were 1.61 and 0.70 day−1, respectively. These results show that there is a difference in the abundance, composition, and ecological role in the microbial food web of picophytoplankton between the near-shore and the offshore areas in Barguzin Bay.
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Acknowledgements
We dedicate the present article to the captain Oleg Kalinin who helped us with sample collections on the R/V Vereshagin. We are also grateful to the crew of the vessel for their assistance with sample collection. Thanks are also due to members of the Limnological Institute at Irkutsk, Siberian Branch of the Russian Academy of Sciences for arranging the sampling schedule. This study was partly supported by a Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), project No. 14255015.
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Katano, T., Nakano, Si., Ueno, H. et al. Abundance, growth and grazing loss rates of picophytoplankton in Barguzin Bay, Lake Baikal. Aquat Ecol 39, 431–438 (2005). https://doi.org/10.1007/s10452-005-9000-8
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DOI: https://doi.org/10.1007/s10452-005-9000-8