Questionable Motives

November 9, 2009

Fresh water speciation: are there barriers within the water?

Filed under: Biology,Education,Evolution — tildeb @ 2:49 pm

Atheist fishNew species evolve when some geographic barrier—a mountain range, an ocean, a glacier—divides a population. Animals on one side of the barrier can no longer breed with animals on the other. Each group adapts to its habitat and, over time, their genes change enough to constitute separate species. This idea dates back to Darwin’s Origin of Species, published in November 1859. Stiassny and her colleagues were the first to suggest that there could be barriers within freshwater. Water, after all, is permeable for fish, right?

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