BIO 309 Lecture Notes - Lecture 25: Edge Species, Habitat Fragmentation, Metapopulation
5 Dec 2018
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Document Summary
Landscape-heterogenous area composed of distinctive patches arranged in a mosaic. Landscape ecology-study of relationships between landscape structures, patterns, and processes. A patch is a homogeneous area that differs from surroundings. Landscape structure is the size, shape, composition, number, and position of patches. Patches form the mosaic that is landscape structure. Edge effect-distinct ecological conditions and higher species richness in ecotones compared to either ecosystem. Those not found in ecotones are interior species. Perimeter estimates of a complex shape depend on size of measuring device. Smaller features may only show up with smaller measuring devices. Two perspectives-animals of different sizes and space requirements. Rate of movement of individuals between subpopulations making up a metapopulation can affect persistence of the species. Predicted animals would move farther in more fragmented landscapes. Predicted animals would stay longer in more isolated patches. Results supported hypothesis that animal movements decrease with habitat fragmentation. Heat waves are weather-related phenomenon for greatest loss of human life.
