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Science 11 June 1993:
Vol. 260. no. 5114, pp. 1629 - 1632
DOI: 10.1126/science.8503007
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Articles

Science, Vol 260, Issue 5114, 1629-1632
Copyright © 1993 by American Association for the Advancement of Science

articles

Divergence in proteins, mitochondrial DNA, and reproductive compatibility across the isthmus of Panama

N Knowlton, LA Weigt, LA Solorzano, DK Mills, and E Bermingham

Smithsonian Tropical Research Institute, Balboa, Republic of Panama.

It is widely believed that gene flow connected many shallow water populations of the Caribbean and eastern Pacific until the Panama seaway closed 3.0 to 3.5 million years ago. Measurements of biochemical and reproductive divergence for seven closely related, transisthmian pairs of snapping shrimps (Alpheus) indicate, however, that isolation was staggered rather than simultaneous. The four least divergent pairs provide the best estimate for rates of molecular divergence and speciation. Ecological, genetic, and geological data suggest that gene flow was disrupted for the remaining three pairs by environmental change several million years before the land barrier was complete.


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