BIO120H1 Lecture Notes - Lecture 21: Habitat Fragmentation, Plant Ecology, Spatial Ecology
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BIO120H1 Full Course Notes
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Application of spatial and metapopulation models to predict butterfly and pika dynamics. Plant ecology statics: concept of the species association. The organismal hypothesis versus the individualistic hypothesis. Gradient studies as a resolution of the debate. Plant ecology dynamics: primary and secondary succession. Population persistence of a rare butterfly in habitat patches. A real case in conservation biology & spatial ecology. Fender"s blue butterfly depends on a rare plant (so if host plants go rare, they are likely to go extinct ) Willamette valley, oregon; in 1850, all native prairie, now, all but 0. 5% converted to agriculture. Butterfly discovered in 1920, thought extinct by 1931, rediscovered 1989. Known from 13 prairie fragments (patches ) Annual pulses of reproduction followed by heavy larval mortality. Explicit spatial map of habitat with two types of vegetation, prairie and farm. Butterflies undergo annual cycles of reproduction, then disperse across habitat. Butterflies must discover prairie or will die without reproducing.
