caa a22 4500 465821782 CHVBK 20180323112137.0 cr unu---uuuuu 170327e19900601xx s 000 0 eng 10.1007/BF00047549 doi (NATIONALLICENCE)springer-10.1007/BF00047549 On the possible role of egg mimics in speciation [Elektronische Daten] [Tijs Goldschmidt, Jaap de Visser] Sexually active male haplochromine cichlid fishes possess pronounced yellow ovoid spots on the anal fm, which mimic eggs of the female and have therefore been called egg dummies (Wickler, 1962b). It is thought that divergence in egg dummy characteristics can considerably reduce gene flow and in this way may trigger off reproductive isolation. Two ways in which egg dummy divergence can develop are described. Both mechanisms may have been operating, at the same time and in the same area, in different species, or possibly even in a single species. Firstly, egg dummy divergence can develop in species with accurately mimetic egg dummies if selection pressures on egg characteristics (size, shape) differ in temporarily isolated demes. As soon as egg characteristics diverge, egg dummy characteristics follow. This type of egg dummy divergence leads to reproductive isolation by mimicry. Mimetic isolation is proposed as a term to describe the mechanism. Secondly, egg dummy divergence can develop if selection pressures on the egg dummy characteristics are different in two temporarily isolated demes. Upon secondary contact, this divergence may work as a sexual isolation mechanism, since female mate choice is important in haplochromines. Egg dummy divergence is likely to develop rapidly and, if this happens repeatedly, explosive speciation may result. Apparently, explosive speciation has occurred in haplochromines. Neither of the two models has been properly tested. Some preliminary evidence was found that the second model is valid, but so far there is no evidence in favour of the first model. Kluwer Academic Publishers, 1990 haplochromine cichlids nationallicence speciation nationallicence mimicry nationallicence egg spots nationallicence mimetic isolation nationallicence sexual isolation nationallicence light conditions nationallicence predation nationallicence divergence of sexual structures nationallicence Goldschmidt Tijs Research Group on Ecological Morphology, Zoology Laboratory, P.O.Box 9516, 2300 RA, Leiden, the Netherlands aut de Visser Jaap aut Acta Biotheoretica Kluwer Academic Publishers 38/2(1990-06-01), 125-134 0001-5342 38:2<125 1990 38 10441 https://doi.org/10.1007/BF00047549 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00047549 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Goldschmidt Tijs Research Group on Ecological Morphology, Zoology Laboratory, P.O.Box 9516, 2300 RA, Leiden, the Netherlands aut NATIONALLICENCE 700 1- de Visser Jaap aut NATIONALLICENCE 773 0- Acta Biotheoretica Kluwer Academic Publishers 38/2(1990-06-01), 125-134 0001-5342 38:2<125 1990 38 10441 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer