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Predictability of temporal variation in climate and the evolution of seasonal polyphenism in tropical butterfly communities

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Halali, Sridhar 
Halali, Dheeraj 
Barlow, Henry 
Molleman, Freerk 
Kodandaramaiah, Ullasa 


Phenotypic plasticity in heterogeneous environments can provide tight environment-phenotype matching. However, the pre-requisite is a reliable environmental cue(s) that enables organisms to use current environmental information to induce the development of a phenotype with high fitness in a forthcoming environment. Here we quantify predictability in the timing of precipitation and temperature change to examine how this is associated with seasonal polyphenism in tropical Mycalesina butterflies. Seasonal precipitation in the tropics typically results in distinct selective environments, the wet- and dry seasons, and changes in temperature can be a major environmental cue. We sampled communities of Mycalesina butterflies from two seasonal and one aseasonal location. Quantifying environmental predictability using wavelet analysis and Colwell’s indices confirmed a strong periodicity of precipitation over a 12-month period at both seasonal locations compared to the aseasonal one. However, temperature seasonality and periodicity differed between the two seasonal locations. We further show that: (1) most females from both seasonal locations synchronise their reproduction with the seasons by breeding in the wet season but arresting reproduction in the dry season. In contrast, all species breed throughout the year in the aseasonal location, and (2) species from the seasonal locations, but not those from the aseasonal location, exhibited polyphenism in wing pattern traits (eyespot size). We conclude that seasonal precipitation and its predictability are primary factors shaping the evolution of polyphenism in Mycalesina butterflies, and populations or species secondarily evolve local adaptations for cue use that depend on the local variation in the environment



adaptive phenotypic plasticity, life-history, predictability, reproductive strategies, seasonal polyphenism, seasonality, Adaptation, Physiological, Animals, Butterflies, Female, Phenotype, Seasons, Tropical Climate, Wings, Animal

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Journal of Evolutionary Biology

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European Research Council (250325)
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