Highly active microbial communities in the ice and snow cover of high mountain lakes.

Applied and Environmental Microbiology
M FelipJ Catalan

Abstract

An exploratory study carried out in Pyrenean and Alpine lakes shows that a rich, active microbial community lives in the slush layers of the winter cover of such lakes in spite of the low temperature and the seasonal occurrence of the habitat. Bacteria were very diverse in morphology, with filaments reaching up to 100 (mu)m long; flagellates, both autotrophic (chrysophytes, cryptophytes, dinoflagellates, and volvocales) and heterotrophic, and ciliates were abundant, reaching biovolume values up to 2.7 x 10(sup6) (mu)m(sup3) ml(sup-1). Species composition was very variable, with dominance depending on date and depth. Although many species were typical of lake plankton communities, some were restricted to the slush, for instance the predatory ciliates Dileptus sp. and Lacrymaria sp., and others were restricted to the surface pools, such as the snow algae Chlamydomonas nivalis. Microbial biomasses and usually bacterial and algal activities were greater in the slush layers than in the lake water. Photosynthesis rate in the upper cover layers reached values up to 0.5 (mu)g of C liter(sup-1) h(sup-1), and high bacterial activities up to 226 pmol of leucine incorporated liter(sup-1) h(sup-1) and 25 pmol of thymidine incorporated liter...Continue Reading

Citations

Apr 5, 2011·Applied and Environmental Microbiology·Tommy HardingWarwick F Vincent
Sep 11, 2012·Journal of Basic Microbiology·Harmesh SahayDilip K Arora
Apr 5, 2013·The ISME Journal·N A D'souzaR M L McKay
Aug 1, 2015·Environmental Microbiology Reports·Robert M L McKayGeorge S Bullerjahn
Feb 1, 2012·Environmental Microbiology Reports·Tomàs Llorens-MarèsEmilio O Casamayor
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Aug 30, 2008·Proceedings of the National Academy of Sciences of the United States of America·Brian R ParkerDavid W Schindler
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May 10, 2020·The Science of the Total Environment·Prakriti Sharma GhimireShichang Kang
Jun 26, 1998·Science·J C PriscuJ L Pinckney
Jul 21, 1998·Science·R Psenner, B Sattler

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