Electrophoretic analysis of a chromosomal hybrid zone in the grasshopper Podisma pedestris

B. Halliday, N.H. Barton, G. Hewitt, Biological Journal of the Linnean Society 19 (1983) 51–62.

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Abstract
We have made an extensive allozyme survey of 21 enzyme and protein loci in populations of the alpine grasshopper Podisma pedestris. This species occurs in two races, differing by a chromosomal fusion which separates the ancestral XO/XX race from a derived neo-XY race. These races also differ in DNA content, and hybrids between them have reduced viability. Electrophoresis reveals that the amount of genetic differentiation between these races is no greater than the variation among populations within each race. Both larger-scale surveys and a detailed survey of an area where the races hybridize, show that the chromosomal change is not correlated with gene frequency changes at any of the 21 loci studied. These findings are consistent with recently developed theory concerning the strength of the barrier to gene flow posed by a hybrid zone with characteristics such as those measured experimentally in Podisma. It is argued that hybrid zones in other species which involve allozymic differences do so because of stronger selection against hybrids rather than through mating isolation.
Publishing Year
Date Published
1983-02-01
Journal Title
Biological Journal of the Linnean Society
Volume
19
Issue
1
Page
51 - 62
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Halliday B, Barton NH, Hewitt G. Electrophoretic analysis of a chromosomal hybrid zone in the grasshopper  Podisma pedestris. Biological Journal of the Linnean Society. 1983;19(1):51-62. doi:10.1111/j.1095-8312.1983.tb00776.x
Halliday, B., Barton, N. H., & Hewitt, G. (1983). Electrophoretic analysis of a chromosomal hybrid zone in the grasshopper  Podisma pedestris. Biological Journal of the Linnean Society, 19(1), 51–62. https://doi.org/10.1111/j.1095-8312.1983.tb00776.x
Halliday, Bruce, Nicholas H Barton, and Godfrey Hewitt. “Electrophoretic Analysis of a Chromosomal Hybrid Zone in the Grasshopper  Podisma Pedestris.” Biological Journal of the Linnean Society 19, no. 1 (1983): 51–62. https://doi.org/10.1111/j.1095-8312.1983.tb00776.x.
B. Halliday, N. H. Barton, and G. Hewitt, “Electrophoretic analysis of a chromosomal hybrid zone in the grasshopper  Podisma pedestris,” Biological Journal of the Linnean Society, vol. 19, no. 1, pp. 51–62, 1983.
Halliday B, Barton NH, Hewitt G. 1983. Electrophoretic analysis of a chromosomal hybrid zone in the grasshopper  Podisma pedestris. Biological Journal of the Linnean Society. 19(1), 51–62.
Halliday, Bruce, et al. “Electrophoretic Analysis of a Chromosomal Hybrid Zone in the Grasshopper  Podisma Pedestris.” Biological Journal of the Linnean Society, vol. 19, no. 1, Wiley-Blackwell, 1983, pp. 51–62, doi:10.1111/j.1095-8312.1983.tb00776.x.

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