Hybridization and morphological variation that spurs adaptive radiations

This Thursday we will discuss how hybridization can generate morphological variation that spurs adaptive radiation chichlids. The paper (Selz et al. 2014; attached) is entitled "Relaxed trait covariance in interspecific cichlid hybrids predicts morphological diversity in adaptive radiations" and has just been published in JEB.

The Encode-discussion has been postponed to a later date (January 30th).

Abstract:

The process of adaptive radiation involves multiple events of speciation in short succession, associated with ecological diversification. Understanding this process requires identifying the origins of heritable phenotypic variation that allows adaptive radiation to progress. Hybridization is one source of genetic and morphological variation that may spur adaptive radiation. We experimentally explored the potential role of hybridization in facilitating the onset of adaptive radiation. We generated first- and second-generation hybrids of four species of African cichlid fish, extant relatives of the putative ancestors of the adaptive radiations of Lakes Victoria and Malawi. We compared patterns in hybrid morphological variation with the variation in the lake radiations. We show that significant fractions of the interspecific morphological variation and the major trajectories in morphospace that characterize whole radiations can be generated in second-generation hybrids. Furthermore, we show that covariation between traits is relaxed in second generation hybrids, which may facilitate adaptive diversification. These results support the idea that hybridization can provide the heritable phenotypic diversity necessary to initiate adaptive radiation.
Published Jan. 7, 2014 10:49 AM - Last modified Mar. 8, 2021 3:51 PM