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1990

Interspecific hybridization

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Morphological Asymmetry And Interspecific Hybridization: A Case Study Using Hylid Frogs, Trip Lamb, James M. Novak, Diane L. Mahoney Jan 1990

Morphological Asymmetry And Interspecific Hybridization: A Case Study Using Hylid Frogs, Trip Lamb, James M. Novak, Diane L. Mahoney

James M. Novak

The limited studies addressing developmental stability of interspecific hybrids suggest a positive association between the level of fluctuating asymmetry and 1) the degree of divergence between parental species, and 2) the recency of the contact zone. To evaluate these associations, we examined asymmetry in a recentlyestablished hybrid population of treefrogs (Hyla cinerea and H. gratiosa) that show marked structural gene divergence. Fluctuating asymmetry (FA), directional asymmetry, and antisymmetry were assessed for eight paired osteometric traits in allozymically-defined parental and hybrid categories. FA levels varied considerably among traits. Nonetheless, for any given trait, the hybrid categories did not demonstrate elevated levels ...