CONTRASTING PATTERNS OF GEOGRAPHIC-VARIATION SHOWN BY MTDNA AND KARYOTYPE ORGANIZATION IN 2 SUBSPECIES OF CALEDIA-CAPTIVA (ORTHOPTERA)

Mitochondrial DNA variation is compared with variation of chromosome s tructure, in two subspecies of Caledia captiva (F.) (Orthoptera: Acrid idae: Acridinae). One subspecies is widespread, is conservative in chr omosome structure, but has considerable geographic variation of mitoch ondrial DNA. In the other, mitochondrial DNA shows very little differe ntiation, but each chromosome shows concordant clines in the position of its centromere. We argue that data discussed here suggest the actio n of natural selection on the physical structure of chromosomes and ka ryotype organization.