Journal Article Snow algal communities on glaciers in the Suntar-Khayata Mountain Range in eastern Siberia, Russia

10 ( 3 )  , pp.227 - 238 , 2016-09
ISSN:18739652
Description
Snow and ice algal communities were investigated on four glaciers in the Suntar-Khayata Mountain Range in eastern Siberia in Russia over three melting seasons from 2012 to 2014. Two taxa of green algae and five taxa of cyanobacteria were observed on the glaciers. The algal community was dominated by green algae: Ancylonema nordenskioldii in the lower bare ice area and Chloromonas sp. in the upper snow area. The total algal bio-volume showed altitudinal variation, ranging from 0.03 to 4.0 mL m−2, and was greatest in the middle of the glaciers. The altitudinal variations in the algal community were similar on all studied glaciers, suggesting that they are typical in this region. Observations over the three years revealed that there was no significant change in the community structure, but a significant change in the total biomass. Since the mean summer air temperature was significantly higher in 2012 when algal biomass was greater, the difference in algal biomass among the years is probably due to the duration of surface melting. The community structure on the studied glaciers is similar to those on glaciers in Arctic and sub-Arctic regions.
本研究は、ロシア、東シベリア、スンタルハヤタ地域の4つの山岳氷河において、2012年から2014年にかけて調査を行い、氷河上に繁殖する雪氷藻類群集の分布と経年変動を明らかにすることを目的とした。調査の結果、氷河表面には2種類の緑藻と5種類のシアノバクテリアが観察された。藻類群集の優占種は,裸氷域では緑藻のAncylonema nordenskioldii、積雪域では緑藻のChloromonas sp.であった。藻類の総体積バイオマスは、0.03から4.0 ml m−2の範囲で高度変化し、氷河中流部で最大となった。以上の特徴は、調査を行った氷河で同様にみられ、また他の北極圏の氷河の藻類群集とも同様であることがわかった。3年間の調査の結果、藻類の群集構造は変化しなかった一方、バイオマスは有意な変動を示した。夏季平均気温が最も高かった2012年にバイオマスが最大となったことから、各年の融解期間が藻類バイオマスに影響したと考えられる。

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