Journal ArticleDOI
Divergence in proteins, mitochondrial DNA, and reproductive compatibility across the isthmus of Panama.
TLDR
Measurements of biochemical and reproductive divergence for seven closely related, transisthmian pairs of snapping shrimps indicate, however, that isolation was staggered rather than simultaneous, and the four least divergent pairs provide the best estimate for rates of molecular divergence and speciation.Abstract:
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.read more
Citations
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Genetic Divergence, Reproductive Isolation, and Marine Speciation
TL;DR: Such studies show how a focus on the physiology, ecology, or sensory biology of reproductive isolation can help uncover the influence of particular genetic changes on reproductive isolation for marine (or terrestrial) taxa.
Journal ArticleDOI
Sibling species in the sea
TL;DR: A large number of abundant, well-studied, or economically important taxa have recently been shown to be complexes of sibling species, and the broad habitat and geographic distributions characteristic of many marine species require reevaluation.
Journal ArticleDOI
The biosynthetic pathway of vitamin C in higher plants
TL;DR: The definition of this biosynthetic pathway should allow engineering of plants for increased ascorbate production, thus increasing their nutritional value and stress tolerance.
Journal ArticleDOI
Perspective: gene divergence, population divergence, and the variance in coalescence time in phylogeographic studies.
Scott V. Edwards,Peter Beerli +1 more
TL;DR: It is shown that phylogeographic studies in vertebrates suggest that divergence of alleles in ancestral species can comprise from less than 10% to over 50% of the total divergence between sister species, suggesting that the problem of ancestral polymorphism in dating population divergence can be substantial.
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New dates and new rates for divergence across the Isthmus of Panama
Nancy Knowlton,Lee A. Weigt +1 more
TL;DR: Patterns of divergence exhibited by allozymes and the mitochondrial COI gene are highly concordant for 15 pairs of snapping shrimp in the genus Alpheus, indicating that they provide a reasonable basis for estimating time since cessation of gene flow.
References
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