Origin of Species
Origin of Species
Origin of Species
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Speciation in cricket frogs (a hypothesis).Two very similar species <strong>of</strong> small frogs, are reproductivelyisolated in the areas where they overlap by a slight difference intheir calls. Females <strong>of</strong> one species don’t recognize males <strong>of</strong> theother.Before the last iceNorthern Southernage, a single species<strong>of</strong> cricket frog mayhave inhabitedmuch <strong>of</strong> southernN. America.During glacial melting, a 200 mile river separated two populations<strong>of</strong> the cricket frog in southeastern and southwestern N. America.After the retreat <strong>of</strong> the glaciers, the two populations came togetheragain in Louisiana and Mississippi. A call difference that evolvedduring separation, keeps the two species from exchanging genestoday.14
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