Darwin3 - Darwin's Precursors and Influences Biogeographic...

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Darwin's Precursors and Influences Biogeographic distribution The idea that the ranges of species was due to the their spreading from a point of origination had several precursors before Darwin developed it in 1837. Buffon drew attention to the fact that similar species occupy the same position in different ecologies (although he did not use those terms 1 ). The German zoologist Peter Simon Pallas discovered that similar forms were often connected by a graded chain of intermediate forms, and in 1825, Leopold von Buch drew the logical conclusion that varieties become segregated species. The first biologist to have suggested that species were independently created all over the world, however, was the botanist J G Gmelin in 1747, and following his work, as Mayr says, "[t]he Biblical story of the Garden of Eden and of Noah's Ark was quietly superseded by various theories of centres of creation ." 2 . And Buffon ("the father of zoogeography" 3 ), in 1779 proposed that a fauna (the complete ecology of an area) was the product of the conditions of the district
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Darwin3 - Darwin's Precursors and Influences Biogeographic...

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