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Polar Lakes and RiversLimnology of Arctic and Antarctic Aquatic Ecosystems$
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Warwick F. Vincent and Johanna Laybourn-Parry

Print publication date: 2008

Print ISBN-13: 9780199213887

Published to Oxford Scholarship Online: January 2009

DOI: 10.1093/acprof:oso/9780199213887.001.0001

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Heterotrophic microbial processes in polar lakes

Heterotrophic microbial processes in polar lakes

(p.197) CHAPTER 11 Heterotrophic microbial processes in polar lakes
Polar Lakes and Rivers

John E. Hobbie

Johanna Laybourn-Parry

Oxford University Press

This chapter examines the activities of heterotrophic microbes (bacteria, flagellates, and ciliated protozoans) in Antarctic continental lakes and Arctic lakes and ponds (Europe, Asia, North America, and Greenland). These microbial food webs consume almost all of the organic carbon produced in these inland waters (autochthonous carbon) or produced on land and transported into these waters (allochthonous carbon). The photosynthetic flagellates that sit on the boundary between heterotrophy and phototrophy (mixotrophs) are also described. In the Antarctic, mixotrophy may play an important role in sustaining communities during winter. In some instances, these mixotrophic microbes may be seasonally important as consumers of bacteria.

Keywords:   lakes, microbial loop, heterotrophy, mixotrophy, carbon cycling, bacteria, viruses, flagellates, ciliates

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