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Abundance, growth and grazing loss rates of picophytoplankton in Barguzin Bay, Lake Baikal

Abundance, growth and grazing loss rates of picophytoplankton in Barguzin Bay, Lake Baikal 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aquatic Ecology Springer Journals

Abundance, growth and grazing loss rates of picophytoplankton in Barguzin Bay, Lake Baikal

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References (38)

Publisher
Springer Journals
Copyright
Copyright © 2005 by Springer Science+Business Media, Inc.
Subject
Life Sciences; Ecosystems; Freshwater & Marine Ecology
ISSN
1386-2588
eISSN
1573-5125
DOI
10.1007/s10452-005-9000-8
Publisher site
See Article on Publisher Site

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.

Journal

Aquatic Ecology – Springer Journals

Published: Sep 7, 2005

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