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BLG 230 (36)
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Patch sizes

3 Pages

Course Code
BLG 230

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 increases rapidly as patch size decreases ■ species from surrounding habitats colonize on the edges of patches to compete with or prey on species living there ■ species disappeared from isolated patches when the surrounding forest was cut ■ species that are lost from small habitat fragments are unlikely to become reestablished there because dispersing individuals are unlikely to find isolated fragments ■ a species may persist in a small patch if it is connected to other patches by corridors of habitat through which individuals can disperse  Invasive – when species spread widely and become unduly abundant, often at a cost to the native species of the region  most introduced species are imported without their natural enemies, while native plants must devote considerable energy to defending themselves against the native herbivores ■ invasive plants generally have high rates of growth and reproduction because they spend less energy in producing defensive compounds ■ introduced pathogens have destroyed whole populations of several eastern North American forests ■ disease outbreaks usually leave no traces in the fossil record  due to human activities, average temperatures in North America will increase about 2- 5 C  organisms that are able to disperse easily may be able to shirt their ranges as rapidly as the climate changes provided that appropriate habitats exist in new areas  ranges of species with sedentary habits are likely to shift slowly  if Earth's surface warms as predicted, new climates will develop and existing climates will disappear ■ new climates are certain to develop at low elevations in the tropics  if warming of oceans continues about 40% of coral reefs are likely to be killed ■ reefs adjacent to cool, upwelling waters and reefs in cloudy waters have relatively low temperatures and are healthy What Strategies Do Conservation Biologists Use?  Protected areas – an important component of efforts to preserve biological diversity ■ preserv
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