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Unformatted text preview: fragmentation of distributions and contribution to speciation. Believed to one explanation for patterns of speciation in the Amazon . Also a possible explanation for the Larus ring species complex : genus Larus (seagulls) fragmented in Siberia during the Pleistocene. Diverged populations of Larus argentatus (herring gull) colonized eastern Siberia, across the Bering straits, across North America, Iceland and back to Northern Europe becoming increasingly diverged at each step. Hybrid zones exist between successive populations but the ends of the ring are reproductively isolated implying that speciation has gone to completion (an example of geographic speciation)...
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- Fall '10