Animal Science and Zoology; Ecology, Evolution, Behavior and Systematics
Abstract :
[en] Abstract
During courtship, prezygotic barriers are thought to maintain the diversity of species since differences in phenotypic traits and reproductive behaviours are likely to be involved in maintaining species boundaries. However, introgressive hybridization has been reported in many different taxa and the resulting hybrids usually possess phenotypic features, including behaviours, that are intermediate between those of the parents. The outcome of hybrids may depend on the interactions between the intrinsic viability of the hybrids, the ecological environment of the species, and the fitness of hybrids in that ecological context. In cichlids, the mechanism of hybridization is increasingly documented as an important factor in their evolutionary radiation since it may provide novel gene combinations that promote speciation and adaptive radiation by generating new transgressive phenotypes. Cichlid species are separated mostly by pre-mating isolating mechanisms. Like colour patterns, acoustic communication is involved in sexual selection, but this pattern has been much less studied and the outcome of hybridization on acoustic features has never been examined. To gain novel insights into the evolution of their acoustic communication behaviour, we performed a hybrid cross between Chindongo saulosi and Maylandia estherae. Qualitative examination of courtship showed that the three groups possess the same sequence of behaviours. However, sounds produced during courtship showed specific signatures since all three groups differ at the level of sound duration and pulse period, with both features being intermediate in hybrids in comparison to the two parent species. Colour patterns in hybrids were also different from those of the parent species. These results show that hybridization can affect at least two kinds of prezygotic barriers, which may be important in the cichlid evolutionary process. However, playback experiments are required to test the strength of these features in sexual selection.
Research Center/Unit :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
Disciplines :
Zoology
Author, co-author :
Parmentier, Eric ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive
Raick, Xavier ; Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS)
Leblanc, Nicolas; Laboratory of Functional and Evolutionary Morphology, FOCUS, University of Liège, Institut de Chimie - B6C, Sart Tilman , 4000 Liège , Belgium
Santoni-Guichard, Ghjuvan; Laboratory of Functional and Evolutionary Morphology, FOCUS, University of Liège, Institut de Chimie - B6C, Sart Tilman , 4000 Liège , Belgium
Banse, Marine ; Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS)
Da, Sié Jean de Dieu; Laboratory of Functional and Evolutionary Morphology, FOCUS, University of Liège, Institut de Chimie - B6C, Sart Tilman , 4000 Liège , Belgium
Van Damme, Arthur ; Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS)
Language :
English
Title :
Acoustic innovations in courtship sounds generated by hybridization in cichlid fish
This study was supported by a grant from the University of Liège (FOCUS) and by a grant from the F.R.S.-FNRS (T.0192.20–PDR).
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