EAE1022 Lecture Notes - Lecture 23: Phylogenetics, Molecular Phylogenetics, Venn Diagram
14 Sep 2018
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Eae1022 lecture 23 + 24 - earth, atmosphere and environment. Plate tectonics and continental drift and animal movements. Australia and the indo-australian archipelago: >20,000 islands, biogeography contrasts the holarctic, holocene = refugial distribution, pleistocene = range expansion. Historical biogeography is an approach used to explain larger scale distributions: barrier regions, oceans (for terrestrial organisms, mountain ranges, deserts (temperature, water availability extremes, geographical distributions vary considerably among taxa but some common distribution limits are shared. A new taxa first forms in one location (centre of origin: dispersal, the pattern of distribution is determined by the ability of the taxa to surmount intervening barriers. Last major warming: milankovitch cycles (variations in solar radiations) explain glaciation events with periodicity of. Why the quaternary might stimulate evolution: vicariance, dispersal and allopatric speciation, the division of populations by environmental barriers. Lake formation, fission and fusion: the contraction of populations.
