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Genetic Structure of Two Species of Waterstriders (Gerridae: Hemiptera) with Differing Degrees of Winglessness

Anthony J. Zera
Evolution
Vol. 35, No. 2 (Mar., 1981), pp. 218-225
DOI: 10.2307/2407832
Stable URL: http://www.jstor.org/stable/2407832
Page Count: 8
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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.
Genetic Structure of Two Species of Waterstriders (Gerridae: Hemiptera) with Differing Degrees of Winglessness
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Abstract

The relationship between degree of winglessness and genetic structure was investigated in two waterstrider species (Gerridae: Hemiptera) with differing degrees of winglessness: the nearly wingless Gerris remigis and the wing-polymorphic Limnoporous canaliculatus. Five of six polymorphic loci in G. remigis exhibited significant spatial variation of allele frequencies. There was fixation or near fixation of different alleles in different populations at three loci. In contrast, five of seven polymorphic loci surveyed in L. canaliculatus exhibited geographically homogeneous allele frequencies. Average heterozygosity in G. remigis (H = 0.058 ± 0.026) was one-quarter the value of L. canaliculatus (H = 0.234 ± 0.072) and was one-third to one-quarter the value for "typical" insects or invertebrates. These data indicate that differing degrees of winglessness have resulted in very different genetic structures in the two species.

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