Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/43510
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Título : Translating environmental gradients into discontinuous reaction norms via hormone signalling in a polyphenic butterfly
Autor : Oostra, Vicencio, Invergo, Brandon M.
Palabras clave : Phenotypic plasticity
Hormonal regulation
Ecdysone
Life history
Reaction norm
Seasonal polyphenism
Fecha de publicación : Mar-2011
Editor: Royal Society (Great Britain)
Resumen: Polyphenisms—the expression of discrete phenotypic morphs in response to environmental variation—are examples of phenotypic plasticity that may potentially be adaptive in the face of predictable environmental heterogeneity. In the butterfly Bicyclus anynana, we examine the hormonal regulation of phenotypic plasticity that involves divergent developmental trajectories into distinct adult morphs for a suite of traits as an adaptation to contrasting seasonal environments. This polyphenism is induced by temperature during development and mediated by ecdysteroid hormones. We reared larvae at separate temperatures spanning the natural range of seasonal environments and measured reaction norms for ecdysteroids, juvenile hormones (JHs) and adult fitness traits. Timing of peak ecdysteroid, but not JH titres, showed a binary response to the linear temperature gradient. Several adult traits (e.g. relative abdomen mass) responded in a similar, dimorphic manner, while others (e.g. wing pattern) showed a linear response. This study demonstrates that hormone dynamics can translate a linear environmental gradient into a discrete signal and, thus, that polyphenic differences between adult morphs can already be programmed at the stage of hormone signalling during development. The range of phenotypic responses observed within the suite of traits indicates both shared regulation and independent, trait-specific sensitivity to the hormone signal.
Descripción : 9 páginas.-- et al.
Versión del editor: http://dx.doi.org/10.1098/rspb.2010.1560
URI : http://hdl.handle.net/10261/43510
DOI: 10.1098/rspb.2010.1560
Citación : Proceedings B: Biological Sciences 278(1706): 789-797 (2011)
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