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Morph-specific assortative mating in common wall lizard females

Current Zoology 2018年第4期64卷 449-453页

作者： Roberto SACCHI alan jioele coladonato Michele GHITTI Marco MANGIACOTTI Stefano SCALI Matteo Bovo Marco ZUFFI Dipartimento di Scienze della Terra e delrAmbiente Università degli Studi di Pavia Via Taramelli 24 Pavia 1-27100 Italy Museo di Storia Naturale di Milano Corso Venezia 55 Milano 1-20121 Italy Museo di Storia Naturale Università di Pisa Via Roma 79 Calci 1-56011 Italy di Pisa Via Roma 79 Calci 1-56011 Italy

Color polymorphism often is associated with alternative reproductive strategies and may reflect different adaptive optima that coexist within populations. The equilibrium among morph frequencies is maintained by the occurrence of opposite selective pressures （disruptive vs. stabilizing）, which promote polymorphism while preserving gene flow. Sexual selection may contribute on both sides, particularly when morphs do not mate randomly. Reptiles offer a good model, notably lizards. Nevertheless, previous studies on mate choice in polymorphic lizards have generated contrasting results, with some studies suggesting that female morphs might tune their preference depending on environmental/social conditions such as crowding. We experimentally manipulated the number of individuals a female common wall lizard Podarcis muralis perceives around her, to test if females of different morphs （white or yellow） tune their choice for white and yellow males in order to maximize the probability that hatchlings follow the strategy best adapted to the population density. Results showed that crowding experienced by females did not affect mate choice, arguing against a flexible choice strategy by females. However, white females significantly associated with white males, whereas yellow females did not significantly associate with yellow males. Thus, sexual selection could contribute to the maintenance of color polymorphism in this species by a mix of assortative and non-assortative mating strategies, which could maintain the equilibrium between gene divergence and gene flow among morphs.

关键词： flexible female choice population density color polymorphism sexual selection

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Color variation in signal crayfish Pacifastacus leniusculus

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Current Zoology 2021年第1期67卷 35-43页

作者： Roberto SACCHI Stefania CANCIAN Daniela GHIA Gianluca FEA alan coladonato Dipartimento di Scienze della Terra e dell'Ambiente Universita degli Studi di PaviaViale Tarameli 24Pavia1-27100Italy

External coloration in animals depends on the interaction of several different factors including the genetics and epigenetics processes that underlie the color expression,the mechanisms of color perception,and the general mechanisms controlling color evolution and *** all,camouflages from predators and conspicuousness are of particular interest because pose animal to choose between opposite adjustment in *** external coloration of crustaceans is mainly due to the accumulation of carotenoids in the exoskeleton and the epidermal layer,and the trade-off between camouflage and communication had led to a variety of responses,involving signal partitioning,spectral sensibility,changing coloration,or signaling ***,we used digital images to explore intrapopulation variability of the external coloration of Pacifastacus leniusculus among body regions within an individual and between *** found that 1)ventral coloration of claws are more saturated and brilliant than upper parts,2)males express a more saturated and brightness coloration than females,especially on the lower portion of claws,3)color intensity and brightness increases with size differently in different body regions,and 4)brightness is more variable in males than in *** the above patterns support the hypothesis that color in this species could be the result of a compromise between camouflage from predators and conspicuousness for *** results of this study suggest that carotenoid might have something to do with intraspecific communication and perform more complex functions than that of a simple pigment.

关键词： crayfish external coloration HSV individual variation sexual dimorphism

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