Habitat Loss
Habitat loss can be
described when an animal loses their home. Every animal in the animal kingdom
has a niche, a role in their animal community, and without their habitat they
no longer have a niche. Habitat loss can be very disruptive to the biosphere. Habitat can also be destroyed indirectly by human activities such as
pollution, fragmentation, climate change and the introduction of invasive
species. Although much habitat destruction can be attributed to human activity,
it is not an exclusively man-mreade phenomenon. Habitat loss also occurs as a
result of natural events such as floods, volcanic eruptions, earthquakes, and
climate fluctuations.
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Trees are cut down for lumber and to clear land for agriculture or cattle.
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A spatial analysis of cumulative habitat loss in Southern California under the Clean Water Act Section 404 Program
Climate
Changes
Climate change is a significant and lasting change in the
statistical distribution of weather patterns over periods ranging from decades to
millions of years. It may be a change in average weather conditions, or in the
distribution of weather around the average conditions (i.e., more or fewer
extreme weather events).
Pesticides and toxic chemical
Substances meant for preventing, destroying or mitigating any pest. By their very nature, most pesticides pose some risk of harm
to humans, animals or the environment because they are designed
to kill or adversely affect living organisms. Significant fish and bird kills
have resulted from the legal application of pesticides, with millions of fish
and birds estimated to die from pesticide exposure each year (Williams, Ted) (Pimental et al 1992). However, at the same time, pesticides are useful to society because
they are used to control or kill potential disease-causing organisms and
insects, weeds and other pests.
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