By Warwick F. Vincent, Johanna Laybourn-Parry
This is often the 1st ebook to explain the ecology of excessive range lakes, rivers and glacial environments in either the North and South polar areas. From the lake-rich floodplains of the Arctic to the deep, enigmatic waters of Lake Vostok, Antarctica, those areas include probably the most notable aquatic ecosystems in the world. they supply a desirable range of habitats for plant, animal and microbial groups, and are proving to be necessary version structures for exploring many ecological issues together with landscape-lake interactions, version of existence to environmental extremes, and controls at the constitution and functioning of aquatic ecosystems. a few of these waters even have direct worldwide implications, together with permafrost thaw lakes as assets of greenhouse gases, subglacial aquatic environments as a storehouse of historical microbes, and Arctic rivers as significant inputs of freshwater and natural carbon to the realm Ocean. on condition that many polar parts are experiencing better weather warming than at decrease latitudes, those ecosystems is also considered as sentinels of worldwide swap. This well timed quantity brings jointly a few of the world's prime researchers in polar limnology to explain those diversified aquatic environments and their ecology. It introduces each one significant environment variety, examines the similarities and changes among Arctic and Antarctic platforms in addition to their responses to environmental switch, and describes new frontiers for destiny learn. A thesaurus of phrases is supplied for non-specialists, and a suite of color plates introduces the ecosystems and their biota. Polar Lakes and Rivers can be of price to scholars and professional researchers alike, in addition to to these with a extra basic curiosity in aquatic ecology, polar environments or international swap who require an authoritative review of this quickly rising subject.
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Additional resources for Polar Lakes and Rivers: Limnology of Arctic and Antarctic Aquatic Ecosystems
5 times seawater), which are monomictic. Like the hypersaline lakes of the Vestfold Hills they are mixed in winter and develop a stratified water column during the summer. The freshwater lakes of this region are renowned for their luxuriant moss communities. These rise from the cyanobacterial mat-coated benthos at depths from 3 to 5 m and form ‘moss pillars’ about 40 cm in diameter and up to 60 cm high (Imura et al. 1999; see Plate 10). Continuous data-logging in two of the freshwater lakes has shown that phytoplankton biomass increases under the ice with the arrival of first light in spring, drops to low values during summer open water conditions, and may then show a second peak during the fall ice-up period (Tanabe et al.
Most animal biomass is found in the Arctic char that feed mainly on the chironomids. Rigler (1978, p. 139) concluded that ‘There is little sign of Arctic adaptation in the classical sense. The species that live in Arctic lakes merely develop and respire more slowly than they would at higher temperatures’. However, this study was undertaken before the advent of molecular and other advanced microbiological techniques, and little is known about the microbial food web of Char Lake. 4 Greenland lakes and ponds The tremendous latitudinal extent of Greenland, from 60° to 83°N, includes a great variety of lakes, ponds, rivers, and streams (Poulsen 1940; Røen 1962; Jensen 2003).
In the most extreme of these, Lake Vida (Victoria Valley), the ice extends almost entirely to the sediments; its 19 m of ice cover overlies a brine layer that is seven times the salinity of seawater with a liquid water temperature of –10°C. Most of the lakes are capped by 4–7 m of ice and are meromictic, with a surface layer of freshwater overlying saline deeper waters. These include Lake Fryxell, Lake Hoare, and Lake Bonney (Plate 4) in the Taylor Valley, Lake Miers in the Miers Valley, and Lake Vanda in the Wright Valley.
Polar Lakes and Rivers: Limnology of Arctic and Antarctic Aquatic Ecosystems by Warwick F. Vincent, Johanna Laybourn-Parry