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Biology of Polar Bryophytes and Lichens (Studies in Polar by R. E. Longton

By R. E. Longton

This ebook studies the biology of bryophytes and lichens within the polar tundra, the place those vegetation might shape a dominant section of the plants. It considers edition to critical environments when it comes to progress shape, body structure and copy. The function of bryophytes and lichens is mentioned in crops approaches akin to colonisation and succession, and in strength movement, nutrient biking and different useful elements of polar ecosystems, either normal and as converted by means of guy, the diversity of microclimates event by way of polar cryptograms is defined utilizing an power finances process, and the environmental relationships of CO2 trade, pressure resistance, development and different physiological responses are mentioned by contrast historical past. Reproductive biology is usually reviewed as an creation to a attention of inhabitants ecology, distribution styles, dispersal strength and the foundation and variation of polar cryptogamic floras. This publication integrates the result of paintings within the Arctic and the Antarctic, and incorporates a class of plants zones appropriate to either polar areas. The examine of plant ecology in those components has complex dramatically and the consequences synthesised the following give a contribution to a normal figuring out either one of polar ecosystems and of the environmental relationships of bryophytes and lichens.

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Biology of Polar Bryophytes and Lichens (Studies in Polar Research)

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Extra resources for Biology of Polar Bryophytes and Lichens (Studies in Polar Research)

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Both Schuster (1983) and Steere (1978a) believe the bryophytes in these two elements to be remnants of an early Tertiary flora formerly existing in Arctic regions under temperate or subtropical conditions. The present species are thought to have persisted throughout the Pleistocene in refugia from which they have subsequently radiated to varying extents. 26 The polar regions Fig. 7. Distribution of the lichen Cladonia stellaris in North America. This species has a circumpolar distribution in temperate, boreal and mild-Arctic regions.

Colonies loose or more frequently compact, <2cm tall {Bryum, Pottia). Tall turf, branches erect Systems formed by sparingly branched acrocarpous mosses with main shoots parallel and erect. Branches erect, of indeterminate growth. Colonies loose or compact, >2cm tall (Dicranum, Polytrichum). Tall turf, branches divergent Systems formed by freely branched pleurocarpous mosses, with main shoots erect. Branches divergent, of determinate growth. Colonies compact or more frequently loose, >2cm tall {Drepanocladus, Sphagnum).

A community of crustose lichens, principally species of Buellia, Lecidea and Rhizocarpon, on inland rocks on the cool-Antarctic island of South Georgia. Similar communities occur in the cold-Antarctic and elsewhere. Several thalli surrounding the central bare area show marginal zonation (Chapter 6). 40 The cryptogamic vegetation Fig. 2. The fruticose lichen Usnea fasciata on an upland rock on Signy I, South Orkney Is (cold-Antarctic). The disk is 5 cm in diameter. Reproduced from Longton (1985a) by courtesy of Pergamon Press.

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