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JPR Advance Access originally published online on August 17, 2005
Journal of Plankton Research 2005 27(8):793-810; doi:10.1093/plankt/fbi054
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org.

Regional, vertical and seasonal distribution of phytoplankton and photosynthetic pigments in Lake Baikal

Susanne Fietz1,*, Galina Kobanova2, Lyubov Izmest’eva2 and Andreas Nicklisch3

1 Leibniz Institute of Freshwater Ecology and Inland Fisheries, Mueggelseedamm 301, 12587 Berlin, Germany, 2 Scientific Research Institute of Biology, State University Irkutsk, Lenina 3, 664003 Irkutsk, Russia and 3 Institute of Biology, Humboldt University Berlin, Luisenstrasse 53, 10099 Berlin, Germany

* Corresponding Author: fietz{at}igb-berlin.de and s_fietz{at}web.de

Received May 2, 2005; accepted in principle July 26, 2005; accepted for publication August 3, 2005; published online August 17, 2005

A 3-year phytoplankton study was carried out in Lake Baikal (Siberia) as part of the CONTINENT project and in conjunction with a 60-year long monitoring programme by the Irkutsk State University. A combination of microscopy and high performance liquid chromatography (HPLC) pigment analysis was used. All over the lake, the dominant functional group (by biovolume) was the vernal diatom blooms, due to the dominance of endemic Cyclotella species. Chlorophyll a (Chl a) was significantly highest at the Selenga and Barguzin inflows (2.39 ± 0.34 and 2.49 ± 0.18 nmol L–1, mean ± 95% CI, respectively) and higher in the South than in the North (1.43 ± 0.26 and 0.96 ± 0.13 nmol L–1). This variation of Chl a reflected changes in the phytoplankton composition. Diatoms and Chrysophyceae were the major contributors to the total Chl a except in the South (Chlorophyceae) and Selenga Delta (cyanobacterial picoplankton). There were also indications of species composition changes due to enhanced P-loading from the Selenga River. However, canonical analyses indicated that temperature and stratification were the major driving forces for regional distribution patterns and seasonal succession. It seems likely that further global warming will cause a shift in the species and group composition towards small cells at the expense of the large endemic diatom flora.


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