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Biogeography: Wallace and Wegener (1 of 2) |
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Patterns of Species Ranges Wallace came to much the same conclusion that Darwin published in the Origin of Species: biogeography was simply a record of inheritance. As species colonized new habitats and their old ranges were divided by mountain ranges or other barriers, they took on the distributions they have today. |
Left: Wallaces 1876 book, The Geographic Distribution of Animals, has plates depicting the animal life of the biogeographic regions he identified. These are mammals typically found in the forests of Borneo. | ||||
Wallace pushed the study of biogeography to grander scales than Darwin. As he traveled through Indonesia, for example, he was struck by the sharp distinction between the northwestern part of the archipelago and the southeastern, despite their similar climate and terrain. Sumatra and Java were ecologically more like the Asian mainland, while New Guinea was more like Australia. He traced a remarkably clear boundary that snaked among the islands, which later became known as Wallaces Line. He later recognized six great biogeographical regions on Earth, and Wallaces Line divided the Oriental and the Australian regions. |
Read Wallace's 1858 manuscript on species. |
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Wallace (in 1848) image courtesy of The Alfred Russel Wallace Page. | next page |
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