Concept 17 - results when humans have accidentally or...

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Concept 50.2 Interactions between organisms and the environment limit the distribution of species Ecologists have long recognized distinct global and regional patterns in the distribution of  organisms. Biogeography is the study of past and present distributions of individual species in the  context of evolutionary theory. Ecologists ask a series of questions to determine what limits the geographical distribution of  any species. Species dispersal contributes to the distribution of organisms. The movement of individuals away from centers of high population density or from their  area of origin is called  dispersal. The dispersal of organisms is crucial to understanding geographic isolation in evolution and  the broad patterns of geographic distribution of species. One way to determine if dispersal is a key factor limiting distribution is to observe the 
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Unformatted text preview: results when humans have accidentally or intentionally transplanted a species to areas where it was previously absent. For the transplant to be considered successful, the organisms must not only survive in the new area, but also reproduce there. If the transplant is successful, then the potential range of the species is larger than its actual range. Species introduced to new geographic locations may disrupt the communities and ecosystems to which they are introduced. Consequently, ecologists rarely conduct transplant experiments today. Instead, they study the outcome when a species has been transplanted accidentally or for another purpose....
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