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Arctic and Alpine Biodiversity: Patterns, Causes and Ecosystem Consequences (Paperback, Softcover reprint of the original 1st ed. 1995)
Loot Price: R2,975
Discovery Miles 29 750
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Arctic and Alpine Biodiversity: Patterns, Causes and Ecosystem Consequences (Paperback, Softcover reprint of the original 1st ed. 1995)
Series: Ecological Studies, 113
Expected to ship within 10 - 15 working days
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As human populations expand and have increasing access to technol
ogy, two general environmental concerns have arisen. First, human
pop ulations are having increasing impact on the earth system, such
that we are altering the biospheric carbon pools, basic processes
of elemental cycling and the climate system of the earth. Because
of time lags and feedbacks, these processes are not easily
reversed. These alterations are occurring now more rapidly than at
any time in the last several million years. Secondly, human
activities are causing changes in the earth's biota that lead to
species extinctions at a rate and magnitude rivaling those of past
geologic extinction events. Although environmental change is
potentially reversible at some time scales, the loss of species is
irrevo cable. Changes in diversity at other scales are also cause
for concern. Habitat fragmentation and declines in population sizes
alter genetic di versity. Loss or introduction of new functional
groups, such as nitro gen fixers or rodents onto islands can
strongly alter ecosystem processes. Changes in landscape diversity
through habitat modification and frag mentation alter the nature of
processes within and among vegetation patches. Although both
ecological changes altering the earth system and the loss of biotic
diversity have been major sources of concern in recent years, these
concerns have been largely independent, with little concern for the
environmental causes the ecosystem consequences of changes in
biodiversity. These two processes are clearly interrelated. Changes
in ecological systems cause changes in diversity."
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