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A Zone of Overlap and Hybridization Between Two Ground Cricket Species

Daniel J. Howard
Evolution
Vol. 40, No. 1 (Jan., 1986), pp. 34-43
DOI: 10.2307/2408601
Stable URL: http://www.jstor.org/stable/2408601
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Zone of Overlap and Hybridization Between Two Ground Cricket Species
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Abstract

In this paper I describe a zone of overlap and hybridization between the ground crickets, Allonemobius fasciatus and A. socius (Orthoptera: Gryllidae). The former occurs in the northeastern United States, the latter is found in the southeastern United States. They meet in a contact zone of variable width that extends from the East Coast to at least Ohio. In the Allegheny Mountains, where appropriate habitats for a species adapted to a northern climate and a species adapted to a southern climate are patchily distributed and widely intermingled, the zone is broad-at least 200 km. Along the coastal plain of New Jersey, where appropriate habitats are not as widely intermingled, the zone is comparatively narrow (5-100 km). Levels of hybridization were assessed by analyzing electrophoretic data, using population genetic models and a character index approach. Both methods of data analysis agreed-where the zone is broader, levels of hybridization appear reduced.

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