Hewitt, Godfrey; Nichols, R.; Barton, Nick HISTA
Females of the grasshopper Podisima pedestris were collected from the middle of a hybrid zone between two chromosomal races in the Alpes Maritimes. They had already mated in the field, and could therefore lay fertilised eggs in the laboratory. The embryos were karyotyped, and found to contain an excess of chromosomal homozygotes. No evidence of assortative mating was found from copulating pairs taken in the field. The excess appears to have been caused by a combination of multiple insemination and assortative fertilisation. The genetics of the assortment, and the implications for the evolution of reproductive isolation are discussed.
We are most grateful to Manse East for excellent technical assistance, to Dr Michael Shaw and Martin Dransfield for statistical advice and to Dr Roger Butlin for critical reading of the manuscript. It is a pleasure to thank M. and Mme. Aviotti and family at Casterino for their help and hospitality over several years of field work. The authorities of Le Parc National de Mercantour kindly gave permission for the collections. This work was financed by grants from the N.E.R.C. and S.E.R.C.
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Hewitt G, Nichols R, Barton NH. Homogamy in a hybrid zone in the alpine grasshopper Podisma pedestris. Heredity. 1987;59(3):457-466. doi:10.1038/hdy.1987.156
Hewitt, G., Nichols, R., & Barton, N. H. (1987). Homogamy in a hybrid zone in the alpine grasshopper Podisma pedestris. Heredity. Nature Publishing Group. https://doi.org/10.1038/hdy.1987.156
Hewitt, Godfrey, R. Nichols, and Nicholas H Barton. “Homogamy in a Hybrid Zone in the Alpine Grasshopper Podisma Pedestris.” Heredity. Nature Publishing Group, 1987. https://doi.org/10.1038/hdy.1987.156.
G. Hewitt, R. Nichols, and N. H. Barton, “Homogamy in a hybrid zone in the alpine grasshopper Podisma pedestris,” Heredity, vol. 59, no. 3. Nature Publishing Group, pp. 457–466, 1987.
Hewitt G, Nichols R, Barton NH. 1987. Homogamy in a hybrid zone in the alpine grasshopper Podisma pedestris. Heredity. 59(3), 457–466.
Hewitt, Godfrey, et al. “Homogamy in a Hybrid Zone in the Alpine Grasshopper Podisma Pedestris.” Heredity, vol. 59, no. 3, Nature Publishing Group, 1987, pp. 457–66, doi:10.1038/hdy.1987.156.