Specifically, NFDS will favour immigrants belonging to locally rare morphs and select against locally common morphs, which are expected to constitute the largest proportion of migrants between populations with similar morph ranks.
Pairwise comparisons revealed similar morph frequencies in Mt Remarkable and Telowie Gorge (P = 0.111) and in Wilpena, Yourambulla Caves, Warren Gorge and Devil's Peak (P values > 0.05), with the exception of Warren Gorge and Devil's Peak within this group (P = 0.027; Additional file 5: Table S4).
Most of sympatric morphs are genetically different, and similar morphs from different lakes likely have a polyphyletic origin.
Coregonids show extensive potential for homoplasy in morphological traits [ 9, 16, 28], and the possibility certainly exists that similar morphs have evolved repeatedly and independently within the region from the Rhine River in the South to the Varde River in the North.
Multiple crater lakes are an ideal system for the study of parallel evolution in body shape in cichlids where similar morphs have repeatedly evolved under comparable ecological niches [ 17, 18].
Polymorphisms involving both benthic and limnetic forms and differences in lateral plate number have been extensively studied in sticklebacks, and it has been found that similar morphs have evolved repeatedly and independently, primarily representing postglacial divergence [ 10- 12].
Mate choice experiments between color morphs of T. moorii revealed variable degrees of reproductive isolation between four different morphs (Egger et al., 2008, 2010); by and large, there is evidence that isolation is more complete between phenotypically highly distinct morphs than between similar morphs (Salzburger et al., 2006; Egger et al., 2010).
In some cases, the populations from open habitat are, despite divergent evolution (see below), more similar in morph frequencies to the shaded habitat in the same locality than to other populations inhabiting open habitats.
Data morphing is similar to image morphing that changes (or morphs) one image into another through a seamless transition.
In this study, we investigate the possibility of a role for parasitism in the diversification among the highly fragmented eco-morphologically similar colour morphs (lineages) of Tropheus cichlids from Lake Tanganyika.
As the number of known specimens increased, scientists began to analyze the variation between individuals and discovered what appeared to be two distinct body types, or morphs, similar to some other theropod species.
