BIO 227 Lecture Notes - Lecture 11: Brown Tree Snake, Habitat Destruction, Omnivore

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10 Sep 2016
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Invasive species continued: brown tree snake management: dead mice, fed tylenol, were dropped from planes so that the snakes would eat them and die. They were also trapped; it was effective but time-consuming: tasmanian devils and cheetahs" low genetic diversity dates back to the ice age. Meets the organism"s critical life needs (key resources) Habitat is organism specific it is the sum of the specific resources that are needed by the organism. Population density is an unreliable indicator of habitat quality: dense population, crowded and may not have as high of fitness as a less dense population, there are just too many. In some cases, a denser population indicates that the environment is beneficial to them but in others it does not: ex. Overcrowded slum v. less dense suburb (in terms humans) Sink populations are maintained not by reproduction, but by immigration from source populations. Critical needs: habitat provides critical resources: food, water, cover, and special needs.

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