Phenotypic plasticity in opsin expression in a butterfly compound eye complements sex role reversal

BMC Evolutionary Biology

Research Article

Adriana D Briscoe¹  Andrew Everett²  Xiaoling Tong²  Antónia Monteiro² 

[1] Department of Ecology and Evolutionary Biology, University of California, 92697, Irvine, CA, USA;Department of Ecology and Evolutionary Biology, Yale University, 165 Prospect St, 06511, New Haven, CT, USA;

关键词: Bicyclus anynana;    Reaction norm;    Ommatidia;    Opsin;    Sexual dimorphism;    Temperature-size rule;    Phenotypic plasticity;    Body size;    Allometry;    Vision;    Optics;   

DOI  :  10.1186/1471-2148-12-232

 received in 2012-08-13, accepted in 2012-11-28,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundAnimals often display phenotypic plasticity in morphologies and behaviors that result in distinct adaptations to fluctuating seasonal environments. The butterfly Bicyclus anynana has two seasonal forms, wet and dry, that vary in wing ornament brightness and in the identity of the sex that performs the most courting and choosing. Rearing temperature is the cue for producing these alternative seasonal forms. We hypothesized that, barring any developmental constraints, vision should be enhanced in the choosy individuals but diminished in the non-choosy individuals due to physiological costs. As a proxy of visual performance we measured eye size, facet lens size, and sensitivity to light, e.g., the expression levels of all opsins, in males and females of both seasonal forms.ResultsWe found that B. anynana eyes displayed significant sexual dimorphism and phenotypic plasticity for both morphology and opsin expression levels, but not all results conformed to our prediction. Males had larger eyes than females across rearing temperatures, and increases in temperature produced larger eyes in both sexes, mostly via increases in facet number. Ommatidia were larger in the choosy dry season (DS) males and transcript levels for all three opsins were significantly lower in the less choosy DS females.ConclusionsOpsin level plasticity in females, and ommatidia size plasticity in males supported our visual plasticity hypothesis but males appear to maintain high visual function across both seasons. We discuss our results in the context of distinct sexual and natural selection pressures that may be facing each sex in the wild in each season.

【 授权许可】

CC BY   
© Everett et al.; licensee BioMed Central Ltd. 2012