A hybrid zone between two subspecies of Chorthippus parallelus. X‐chromosome variation through a contact zone

Summary Two grasshopper subspecies, Chorthippus parallelus parallelus (Cpp) and Chorthippus parallelus erythropus (Cpe), meet along the Pyrenees where they hybridize and produce a hybrid zone. A contact zone located in the Col de Portalet has been analyzed for the distribution of chromosome markers...

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Published in:Journal of evolutionary biology 1996-03, Vol.9 (2), p.173-184
Main Authors: Serrano, L., García de la Vega, C., Bella, J. L., López‐Fernández, C., Hewitt, G. M., Gosálvez, J.
Format: Article
Language:English
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Chorthippus parallelus
hybrid zones
Insect cytogenetics
speciation
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container_issue 2
container_start_page 173
container_title Journal of evolutionary biology
container_volume 9
creator Serrano, L.
García de la Vega, C.
Bella, J. L.
López‐Fernández, C.
Hewitt, G. M.
Gosálvez, J.
description Summary Two grasshopper subspecies, Chorthippus parallelus parallelus (Cpp) and Chorthippus parallelus erythropus (Cpe), meet along the Pyrenees where they hybridize and produce a hybrid zone. A contact zone located in the Col de Portalet has been analyzed for the distribution of chromosome markers on the sex (X) chromosome in pure and hybrid populations. C‐banding allowed us to distinguish both pure subspecific forms and recombinant forms, and to demonstrate their different frequencies through the contact zone. Interestingly, the distal C‐band (P) on the X chromosome that characterizes Cpp individuals occurs at very high frequency through the zone and then drops sharply, close to where pure Cpe populations are found. A novel interstitial C‐band (H) has been found, probably derived from that characterizing Cpe individuals (E). This marker band is only present in hybrid populations. These data are discussed in the light of the dynamics of the hybrid zone.
doi_str_mv 10.1046/j.1420-9101.1996.9020173.x
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source Wiley-Blackwell Journals; Oxford Journals Online
subjects Chorthippus parallelus
hybrid zones
Insect cytogenetics
speciation
title A hybrid zone between two subspecies of Chorthippus parallelus. X‐chromosome variation through a contact zone
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