Freshwater fish at top of food chain evolve more slowly
Thursday, July 30, 2009 - 15:56
in Biology & Nature
Since evolving to eat other fish, freshwater fish at the top of the food chain have remained relatively unchanged compared with their insect- and snail-eating cousins, according to new research. Scientists report in the journal Evolution that once these fish, known as centrarchids, became top predators in aquatic ecosystems, natural selection put the brakes on their evolution.read more
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