Abstract
Seasons vary in the average environmental conditions a species experiences, meaning that optimum strategies for concealment or feeding may also vary. Populations of the ladybird Harmonia axyridis contain both melanic and non-melanic forms and changes in allele frequency in some populations suggest that melanism may be advantageous in winter, but costly in summer. This could favour the evolution of phenotypic plasticity in colour pattern, as individuals which changed colour throughout the year would be able to maximise their fitness. We have previously shown in the laboratory that melanisation in the “non-melanic” morph of H. axyridis, f. succinea, is predominantly controlled by temperature during development. We now report that wild populations of H. axyridis f. succinea also conform to this principle: lower field temperatures during development produce individuals with more and larger spots. Furthermore, we have found that the critical period of development where temperature affects the level of melanisation covers the pupal and late larval stages, and melanisation increases with the length of time spent at cold temperature. We conclude it is likely that the temperature experienced during this period is used to predict the temperature encountered as an adult. This may allow individuals to produce the level of melanisation necessary to maintain activity levels at the temperatures encountered when they emerge. The long sensitive period seen in H. axyridis may be in order to avoid mismatches between melanisation and seasonal environment.
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Acknowledgements
We thank Emma Rhule and Ian Wright for assistance with practical work. FMJ is funded by a Royal Society University Research Fellowship.
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Michie, L.J., Masson, A., Ware, R.L. et al. Seasonal phenotypic plasticity: wild ladybirds are darker at cold temperatures. Evol Ecol 25, 1259–1268 (2011). https://doi.org/10.1007/s10682-011-9476-8
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DOI: https://doi.org/10.1007/s10682-011-9476-8