Seasonal dynamics of akinetes of Anabaena flos-aquae in bottom sediments and water column of small Siberian reservoir
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Seasonal dynamics of Anabaena flos-aquae (Lyngb.) Breb., including vegetative cells, akinetes and akinete envelopes, in bottom sediments and water column at both littoral and deeper central stations of a small Siberian reservoir was studied. Two types of akinetes were observed: in the first half of summer Anabaena formed akinetes, which served for vegetative reproduction and germinated in water column soon after differentiation, while in the second half of summer the akinetes produced served as a resting stages, which were deposited to bottom sediments. Canonical correlation analyses revealed that decrease of water temperature was the main environmental factor that stimulated the akinete formation. In contrast to the general opinion, concentration of inorganic phosphorus slightly, but positively influenced the akinete formation. Thus, akinetes formed in response to the temperature decrease, needs a certain level of this nutrient. At littoral and open-water stations abundance and seasonal dynamics of akinetes in water column and their sinking pattern were very similar. However, seasonal dynamics of abundance of akinetes in sediments in these two reservoir locations differed: whereas the abundance of akinetes in open water increased permanently during the summer, that in the littoral decreased soon after their sedimentation. The cause for decrease in abundance of akinetes in bottom sediments in winter is unknown.
KeywordsAkinetes Cyanobacteria Cyanobacterial blooms Resting stages
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The work was supported by grant No. REC-002 of the U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union (CRDF) and the Ministry of Education and Science of Russian Federation, and at the stage of generalization – by grant of Russian Foundation for Basic Research No. 05-04-48454, by personal grant of Krasnoyarsk Regional Science Foundation for young scientists, by grant “Universities of Russia” No. UR.07.01.100 from the Ministry of Education and Science of Russian Federation and by Award No y3-B-02-07 of the U.S. Civilian Research and Development Foundation (CRDF) and RF Ministry of Education, BRHE Post-Doctoral Fellowship Program.
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