Sea and lake ice
Sea and lake ice
Sea ice covers a significant area of the polar regions, particularly in winter. This chapter discusses the formation and nature of different types of sea ice. The biological makeup of sea ice communities, which includes a significant metazoan component, is complex. Sea ice photosynthetic communities are often dominated by highly abundant diatoms. Sea ice communities face the challenge of continuous freezing temperatures and considerable variations in salinity, as well as low levels of photosynthetically active radiation. Despite the challenging environment, biological activity in the sea ice can be high and this is illustrated by an exploration of photosynthesis and bacterial production rates. Bacteria and phototrophs are in turn exploited by a range of protozoan and metazoan grazers within the sea ice community. Viruses appear to be important in sea ice, as they are in glacial environments (cryoconite holes), and may play an important role in carbon cycling. By comparison, lake ice is poorly researched, but functional largely cyanobacterial communities have been described in the perennial ice covers of lakes in the McMurdo Dry Valleys of Antarctica. Annual ice covers on alpine lakes support microbial communities that include rotifers. The limited information on photosynthetic rates and rates of bacterial production in lake ice are outlined.
Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.
If you think you should have access to this title, please contact your librarian.