Abstract
The grasshopper Chorthippus parallelus (Cp) has two distinct subspecies which meet along the Pyrenees forming a hybrid zone. As Cp is rarely found above 2000 m, the contact between the two subspecies must occur through valleys crossing the Pyrenees perpendicularly or at both ends of the mountain ridge. The contact zones in two valleys have already been studied in detail, Col de Porta-let (Central Pyrenees) and Col de la Quillane (Eastern Pyrenees), and this paper analyses the structure of the contact zone at the western end of the Pyrenees. The study has been carried out using different chromosome markers obtained by C-banding and silver staining, both related to the sex chromosome. Although the structure of this contact zone, analysed using these two markers, is similar to that of the contact zones occurring in other valleys, it is much wider and some remarkable peculiarities in the shapes of the clines have been detected. Additionally, hybrid-related sex chromosome markers detected in Portalet have not been found in the present sample.
Similar content being viewed by others
Article PDF
References
Barton, N H, Halliday, R B, and Hewitt, G M. 1983. Rare electrophoretic variants in a hybrid zone. Heredity, 50, 139–146.
Barton, N H, and Hewitt, G M. 1989. Adaptation, speciation and hybrid zones. Nature, 341, 497–503.
Bazykin, A D. 1969. Hypothetical mechanisms of speciation. Evolution, 23, 685–687.
Bella, J L, Butlin, R K, Ferris, C, and Hewitt, G M. 1992. Asymmetrical homogamy and unequal sex ratio from reciprocal mating-order crosses between Chorthippus parallelus subspecies. Heredity, 68, 345–352.
Bella, J L, Hewitt, G M, and Gosálvez, J. 1990. MeiotlC imbalance in laboratory-produced hybrid males of Chorthippus parallelus parallelus and Chorthippus parallelus erythropus. Genet Res, 56, 43–48.
Bella, J L, Serrano, L, Hewitt, G M, and Gosálvez, J. 1993. Heterochromatin heterogeneity and rapid divergence of the sex chromosomes in Chorthippus parallelus parallelus and C.p. erythropus (Orthoptera). Genome, 36, 542–547.
Butlin, R K, and Hewitt, G M. 1985a. A hybrid zone between Chorthippus parallelus parallelus and Chorthippus parallelus erythropus (Orthoptera: Acrididae): morphological and electrophoretical characters. Biol J Linn Soc, 26, 269–285.
Butlin, R K, and Hewitt, G M. 1985b. A hybrid zone between Chorthippus parallelus parallelus and Chorthippus parallelus erythropus (Orthoptera: Acrididae): behavioural characters. Biol J Linn Soc, 26, 287–299.
Butlin, R K, Ritchie, M G, and Hewitt, G M. 1991. Comparisons among morphological characters and between localities in the Chorthippus parallelus hybrid zone (Orthoptera: Acrididae). Phil Trans R Soc B, 334, 297–308.
Endler, I A. 1977. Geographic Variation, Speciation and Clines. Princeton University Press, Princeton.
Faber, A. 1958. Chorthippus erythropus n. sp. ein nächster Verwandter de Germanien Grasschercke (Ch. longicornis Latv.). Stuttgarter Beiträge zur Naturkunde, 16, 1–8.
GENSTAT 5. 1987. GENSTAT 5 Reference Manual. Clarendon Press, Oxford.
Gosálvez, J, López-Fernández, C, Bella, J L, Butlin, R K, and Hewitt, G M. 1988. A hybrid zone between Chorthippus parallelus parallelus and Chorthippus parallelus erythropus (Orthoptera: Acrididae): chromosomal differentiation. Genome, 30, 656–663.
Hewitt, G M. 1988. Hybrid zones: natural laboratories for evolutionary studies. Trends Ecol Evol, 3, 158–167.
Hewitt, G M. 1989. The subdivision of species by hybrid zones. In: Otte, D. and Endler, J. (eds) Speciation and its Consequences, pp. 85–109. Sinauer Associates, Sunderland, MA.
Hewitt, G M. 1990. Divergence and speciation as viewed from an insect hybrid zone. Can J Zool, 68, 1701–1715.
Hewitt, G M. 1993. After the ice: parallelus meets erythropus in the Pyrenees. In: Harrison, R. G. (ed.) Hybrid Zones and the Evolutionary Process, pp. 140–164. Oxford University Press, Oxford.
Hewitt, G M, Gosalvez, J, López-Fernández, C, Ritchie, M G, Nichols, W, and Butlin, R K. 1988. Differences in the nucleolar organisers, sex chromosomes and Haldane's rule in a hybrid zone. In: Brandham, P. E. (ed.) Kew Chromosome Conference, vol. 111, pp. 109–119. HMSO, London.
Mallet, J, and Barton, N H. 1989. Strong natural selection in a warning-color hybrid zone. Evolution, 43, 421–431.
Marchant, A D, Arnold, M L, and Wilkinson, P. 1988. Gene flow across a chromosomal tension zone. 1. Relicts of ancient hybridization. Heredity, 61, 321–328.
Nichols, R A, and Hewitt, G M. 1986. Population structure and the shape of a chromosomal cline between two races of Podisma pedestris (Orthoptera: Acrididae). Biol J Linn Soc, 29, 301–316.
Nichols, R A, and Hewitt, G M. 1994. The genetic consequences of long distance dispersal during colonization. Heredity, 72, 312–317.
Reynolds, W J. 1980. A re-examination of the characters separating Chorthippus montanus and C. parallelus (Orthoptera: Acrididae). J Nat Hist, 14, 283–303.
Ritchie, M G. 1990. Are differences in song responsible for assortative mating between subspecies of the grasshopper Chorthippus parallelus (Orthoptera: Acrididae)? Anim Behav, 39, 685–691.
Ritchie, M G, Butlin, R K, and Hewitt, G M. 1989. Assortative mating across a hybrid zone in Chorthippus parallelus (Orthoptera: Acrididae). J Evol Biol, 2, 339–352.
Ritchie, M G, Butlin, R K, and Hewitt, G M. 1992. Fitness consequences of potential assortative mating inside and outside a hybrid zone in Chorthippus parallelus (Orthoptera: Acrididae): implications for reinforcement and sexual selection theory. Biol J Linn Soc, 45, 219–234.
Rufas, J S, and Gosalvez, J. 1982. Development of silver stained structures during spermatogenesis of Schistocerca gregaria (Forsk) (Orthoptera: Acrididae). Caryologia, 35, 261–267.
Sumner, A T. 1972. A single technique for demonstrating centromeric heterochromatin. Exp Cell Res, 75, 304–306.
Szymura, J M, and Barton, N H. 1986. Genetic analysis of a hybrid zone between the fire-bellied toads, Bombina bombina and B. variegata, near Cracow in Southern Poland. Evolution, 40, 1141–1159.
Vanlerberghe, F, Boursot, P, Nielsen, J T, and Bonhomme, F. 1988. A steep cline for mitochondrial DNA in Danish mice. Genet Res, 52, 185–193.
Virdee, S, and Hewitt, G M. 1990. Ecological components of a hybrid zone in the grasshopper Chorthippus parallelus (Zetterstedt) (Orthoptera: Acrididae). Bol San Veg Plagas, 20, 299–309.
Woodruff, D S. 1989. Genetic anomalies associated with Cerion hybrid zones: the origin and maintainance of the new electromorphic variants called hybrizymes. Biol J Linn Soc, 36, 281–294.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bun̄o, I., Torroja, E., López-Fernádez, C. et al. A hybrid zone between two subspecies of the grasshopper Chorthippus parallelus along the Pyrenees: the west end. Heredity 73, 625–634 (1994). https://doi.org/10.1038/hdy.1994.170
Received:
Issue Date:
DOI: https://doi.org/10.1038/hdy.1994.170
Keywords
This article is cited by
-
Multilocus phylogeography of the common lizard Zootoca vivipara at the Ibero-Pyrenean suture zone reveals lowland barriers and high-elevation introgression
BMC Evolutionary Biology (2013)
-
Asymmetric mate choice, hybridization, and hybrid fitness in two sympatric grasshopper species
Behavioral Ecology and Sociobiology (2011)
-
Preliminary analysis of a hybrid zone between two subspecies of Zootermopsis nevadensis
Insectes Sociaux (2009)
-
An unusual phylogeography in the bushcricket Ephippiger ephippiger from Southern France
Heredity (2006)