Abstract
Within the Caledia captiva grasshopper species-complex, the “Torresian” and “Moreton” taxa show extensive karyotypic and genie differences. They are parapatric, and form a narrow hybrid zone which has been shown to be stable and to be maintained by hybrid breakdown largely attributable to the chromosomal differences. The Moreton, “South East Australian” (SEA) and “Lake's Entrance” (LE) taxa, however, have similar genie characteristics and represent segments of a gradual continuous cline in the frequencies of chromosome morphs. A study of mitochondrial DNA (mtDNA) variation in these taxa, using fragment-length patterns generated by four restriction enzymes, has shown that Moreton, SEA and LE form one polythetic taxon, and that insects from certain sites within the Torresian range fall into a separate taxon. There is an area, however, within the range of the chromosomally and allozymically defined Torresian taxon, in which the mtDNA is found to be exclusively of the Moreton/SEA/LE type. This area of apparent introgression extends much further into the range of the Torresian taxon than any reported introgression of either chromosome or allozyme markers from the Moreton taxon. It is suggested that the hybrid zone (as defined by nuclear characters) has migrated southwards, somehow leaving Moreton-type mtDNA behind. If this is the case, then the absence of Moreton nuclear genes in these insects, whose mtDNA shows that they are descended from Torresian/Moreton hybrids, gives additional suppport to the concept of a “co-adapted genome” as a characteristic of a biological species.
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Marchant, A. Apparent introgression of mitochondrial DNA across a narrow hybrid zone in the Caledia captiva species-complex. Heredity 60, 39–46 (1988). https://doi.org/10.1038/hdy.1988.7
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DOI: https://doi.org/10.1038/hdy.1988.7
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