ANTH 160D2 Lecture Notes - Lecture 4: Iberian Ribbed Newt, Osbert Salvin, Small Ground Finch
11 Sep 2018
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Iberian ribbed newt: secretes poison from its skin through ribs when threatened: tail/appendage autonomy (lose tail when scared) Evolution and the environment (examples: biston betularia (peppered moths) Industrial revolution in uk: first reported in 1848 between manchester and london, england, by 1895, b. b. Carbinaria represent 98% on the population in manchester: b. b. Carbinaria are increasingly rare and may be nearly extinct in the next few decades: 1840-1870 2nd industrial revolution in england. If two species with similar beaks share an island, the beaks are more divergent - the longer beak is longer than the average and the shorter beak is shorter than average. Species seem to avoid inhabiting overlapping spaces: darwin"s "divergence, gause"s competitive exclusion principle, peter and rosemary grant. Individuals diversify towards specialized foods based on beak type: biospheric buffet. Specialized response often response to specialized pressure: natural selection through competitive advantage, poecilia reticulata (guppies or millions fish, role of signaling and coloration, camouflage/predator avoidance, don"t get eaten.
