Abstract
Insects with two or more generations per year will generally experience different selection regimes depending on the season, and accordingly show seasonal polyphenisms. In butterflies, seasonal polyphenism has been shown with respect to morphology, life history characteristics and behaviour. In temperate bivoltine species, the directly developing generation is more time-constrained than the diapause generation, and this may affect various life history traits such as mating propensity (time from eclosion to mating). Here, we test whether mating propensity differs between generations in Pieris napi, along with several physiological parameters, i.e. male sex pheromone synthesis, and female ovigeny index and fecundity. As predicted, individuals of the directly developing generation—who have shorter time for pupal development—are more immature at eclosion; males take longer to synthesise the male sex pheromone after eclosion and take longer to mate than diapause generation males. Females show the same physiological pattern; the directly developing females lay fewer eggs than diapausing females during the first days of their life. Nevertheless, the directly developing females mate faster after eclosion than diapausing females, indicating substantial adult time stress in this generation and possibly an adaptive value of shortening the pre-reproductive period. Our study highlights how time stress can be predictably different between generations, affecting both life history and behaviour. By analysing several life history traits simultaneously, we adopt a multi-trait approach to examining how adaptations and developmental constraints likely interplay to shape these seasonal polyphenisms.
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Acknowledgements
We thank Birgitta Tullberg, Bengt Karlsson and two anonymous reviewers for constructive comments on the manuscript. This work was supported by the Swedish Research Council.
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Larsdotter Mellström, H., Friberg, M., Borg-Karlson, AK. et al. Seasonal polyphenism in life history traits: time costs of direct development in a butterfly. Behav Ecol Sociobiol 64, 1377–1383 (2010). https://doi.org/10.1007/s00265-010-0952-x
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DOI: https://doi.org/10.1007/s00265-010-0952-x