BILD 3 Lecture Notes - Lecture 9: Speciation, Zygote, Zapus
Document Summary
Summary - what is a species? thus speciation: different concepts of species exist, studies that define species usually use multiple/all techniques, mating studies, morphological or behavioral differences, studies of genetic divergence. Id of species and subspecies can be controversial. How valid is the taxonomy: preble"s meadow jumping mouse (zapus hudsonius preblei, found in riparian corridors in colorado, wyoming, federally listed as threatened 1998, could restrict economic development. How do species arise: allopatric speciation, vicariance, dispersal, sympatric speciation, habitat differentiation, polyploidy in plants. Allopatric speciation: reproductive isolation occurs because populations are geographically separated either by vicariance or dispersal. Vicariance: divergence of two populations due to physical barrier, example of allopatric speciation by vicariance: isthmus of panama, used to be open water, closed 3 to 15 million years ago when a land bridge (the isthmus of. Dispersal: divergence of a small population away from a large, ancestral population, small population disperses away from large population, move themselves away.
