LS1_LECTURE_21

Moving beyond traditional range maps we can now use

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Unformatted text preview: ed set of physical conditions—to a particular temperature and moisture regime on land, or a particular water depth and movement regime in water. Moving beyond traditional range maps, we can now use remote sensing data to generate predicted species distribution maps Biotic Factors !  The distribution of a species is often limited by biotic factors— interactions with other organisms. !  Interactions including competition, reproductive requirements, and parasitism can all affect the distribution of a species. !  Recall competition between Townsend’s and Hermit Warblers. The Role of History !  The first factor to consider in species distribution is the history of dispersal. Think of history as evolutionary time… !  Dispersal is the movement of an individual from its place of birth to the location where it lives and breeds as an adult. !  Think about dispersal of various organisms you have learned about and how this affects genetics. !  If a species is not found in a particular area, a physical barrier to its dispersal may exist. What are some of these barriers? The Wallace Line: Barriers to Dispersal !  Wallace realized that the plants and animals nat...
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