...The breeding call as an isolating mechanism...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...If hybridizationdid occur, the differences in mating call subsequentlywere enhanced, thereby providing a valid isolating mechanism insympatric populations...
William E. Duellman 「Middle American Frogs of the Hyla microcephala Group」
...I believe itcontinues in a semicircle and joins the lake again, thus isolating thehill I wished to visit...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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