BISC 204 Lecture Notes - Lecture 14: Metapopulation, Insular Biogeography, Dynamic Equilibrium
13 Nov 2017
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Patterns of species diversity and reserve design other features also influence diversity. Evolutionary history, habitat heterogeneity, species interactions, etc. Higher species richness at low latitudes (closer to the equator). Birds: since glaciation/major disturbance (which resets diversity), species accumulation, climate stability = more diversification tundra. 23: area, tropical habitats dominate terrestrial landmasses, statistical artifact, energy- tropical. Species-area curve (also other island-like habitats: mountaintops, lakes, forest: island area predicts species diversity. S = c *az c is constant of spp. /area z is slope z = 0. 32 for most islands. Why might large islands have more species than small islands: island isolation predicts species diversity. Islands near sources of potential colonists have higher species diversity: equilibrium view of island species diversity. Dynamic equilibrium theory that explains species richness of islands. Island richness determined by colonization and extinction rates (number of species. Species diversity balanced between arrival of new colonists and extinction of existing species (rates, #spp/time)
