GEO 446LEC Lecture Notes - Lecture 8: Fagus Grandifolia, Plate Tectonics, Continental Drift
15 Mar 2019
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Document Summary
Earth"s temperature over the past 500 million years. Jump dispersal across a major barrier (sea; mountain, etc. ) Determining if ecology or history is more important. Distribution of warm rain forest and warm seasonal forest. Time-series of beech (fagus grandifolia) pollen percentages from 14 ka to 0 ka. Present and last glacial maximum vegetation formations and biomes. Diffusion gradual movement of a population across a hospitable terrain for a period of several generations. Jump dispersal movement of individual organisms across large distances of inhospitable habitat followed by the successful establishment of a population in the new area. Secular dispersal diffusion occurring in evolutionary time. Most colonizations involve jump dispersal first, followed by diffusion. Although the geographic range is expanding, natural selection is causing migrants to diverge from the ancestral population. Not of immediate interest for ecologists working in ecological time. Answer to reid"s paradox seems to lie in haphazard, long range dispersal of seeds.
