Figure 4 : High LWS opsin diversity likely because of the ancient hybridization event.

From: Ancient hybridization fuels rapid cichlid fish adaptive radiations

Figure 4

The two major LWS opsin haplotype classes, I and II, in the LVRS (orange) are each shared exclusively with either the Congolese (A. stappersi and A. sp. ‘Yaekama’, red) or the Upper Nile lineage (H. gracilior and T. pharyngalis, blue), respectively (details in Supplementary Fig. 7; Supplementary Data 3). LWS haplotype class I is generally associated with cichlids living in shallow and clear water habitats, whereas class II is associated with deeper and more turbid habitats. Speciation by divergence in habitat type seems to have been accompanied by fixation of alternative LWS haplotypes both at early and at late stages of the adaptive radiation. This is exemplified by near fixation of alternative haplotype classes between ecologically divergent genera such as shallow water rocky shore algae scrapers of Neochromis and Mbipia versus mud bottom detritivores of the genus Enterochromis, and by the young incipient species pair of Pundamilia macrocephala ‘blue’ (living very shallow) and ‘yellow’ (living deeper) which have predominantly alleles of haplotype class I and II, respectively (Photo credits: Ole Seehausen, Adrian Indermaur, ‘Teleos’, Oliver Selz, Uli Schliewen).