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Assortative mating across a hybrid zone in Chorthippus parallelus (Orthoptera: Acrididae)

Assortative mating across a hybrid zone in Chorthippus parallelus (Orthoptera: Acrididae) Two subspecies of the grasshopper Chorthippus parallelus meet and form a hybrid zone in the Pyrenees. Both strong hybrid dysfunction and a behavioural difference occur, which would seem to make the zone a suitable candidate for speciation by reinforcement. One of the classic ways of looking for this is to test for increased levels of assortative mating between populations from close to the region of contact. Here we show that, with virgin insects, such assortment decreases as one approaches the centre of the zone in C. parallelus. The pattern is different upon remating, with non‐virgins showing a pattern more like that predicted by reinforcement. Overall there is little evidence for reinforcement. We argue that other tests of the model may be more appropriate for stable hybrid zones. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Evolutionary Biology Wiley

Assortative mating across a hybrid zone in Chorthippus parallelus (Orthoptera: Acrididae)

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References (42)

Publisher
Wiley
Copyright
Copyright © 1989 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1010-061X
eISSN
1420-9101
DOI
10.1046/j.1420-9101.1989.2050339.x
Publisher site
See Article on Publisher Site

Abstract

Two subspecies of the grasshopper Chorthippus parallelus meet and form a hybrid zone in the Pyrenees. Both strong hybrid dysfunction and a behavioural difference occur, which would seem to make the zone a suitable candidate for speciation by reinforcement. One of the classic ways of looking for this is to test for increased levels of assortative mating between populations from close to the region of contact. Here we show that, with virgin insects, such assortment decreases as one approaches the centre of the zone in C. parallelus. The pattern is different upon remating, with non‐virgins showing a pattern more like that predicted by reinforcement. Overall there is little evidence for reinforcement. We argue that other tests of the model may be more appropriate for stable hybrid zones.

Journal

Journal of Evolutionary BiologyWiley

Published: Sep 1, 1989

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