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Evidence of Genetic Dominance of the 13-year Life Cycle in Periodical Cicadas (Homoptera: Cicadidae: Magicicada spp.)

Randel Tom Cox and C. E. Carlton
The American Midland Naturalist
Vol. 125, No. 1 (Jan., 1991), pp. 63-74
DOI: 10.2307/2426370
Stable URL: http://www.jstor.org/stable/2426370
Page Count: 12
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Evidence of Genetic Dominance of the 13-year Life Cycle in Periodical Cicadas (Homoptera: Cicadidae: Magicicada spp.)
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Abstract

Several lines of evidence suggest that the 13-year life cycle is genetically dominant over the 17-year life cycle in periodical cicadas. They are: (1) 13-year dominance best predicts the decline of 17-year Brood X, and concomitant increase in Brood XIX in the midwest, following a hypothesized 1868 hybridization with 13-year Brood XIX through assimilation of heterozygotes into Brood XIX; (2) the pattern of 4-year off-schedule emergences of recessive segregates in Illinois following the proposed 1868 hybridization is consistent with a 13-year dominance model, but is inconsistent with a 17-year dominance model; and (3) migration of a strongly selected and dominant 13-year allele best explains the synchronization and proximity of contrasting genotypes within the ranges of Broods XIX and XXIII in the midwest.

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