A novel method of behavioural thermoregulation in butterflies

Kemp, D.J., and Krockenberger, A.K. (2002) A novel method of behavioural thermoregulation in butterflies. Journal of Evolutionary Biology, 15 (6). pp. 922-929.

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The requirement for efficient thermoregulation has directed the coevolution of specialized morphological and behavioural traits in ectotherms. Adult butterflies exhibit three thermoregulatory mechanisms, termed dorsal, lateral and reflectance basking. In this study, we investigate a potential fourth mechanism whereby individuals perch with their wings fully spread and angled downwards such that the margins are appressed to the substrate. We find that mate-locating male Hypolimnas bolina (L.) (Nymphalidae) adopt this posture when operational thoracic temperatures are lowest (less than approximately 34 °C). As thoracic temperature increases, males perch with wings increasingly closed and ultimately select shaded microhabitats. Using thermocouple-implanted dead models, we show that appressed posture individuals warm faster than those adopting the conventional dorsal-basking (horizontal wing) posture. This thermal advantage is not mitigated by shading of the outer 60–70% of the wing area, which suggests that – as with the conventional dorsal posture – only the basal wing surfaces contribute to heat gain via the absorption of solar irradiation. These investigations suggest that appression represents a novel extension of conventional dorsal basking behaviour in butterflies.

Item ID: 13567
Item Type: Article (Research - C1)
ISSN: 1420-9101
Keywords: basking; colouration; hypolimnas; Lepidoptera; nymphalidae; phenotype; temperature; territoriality; thermal ecology
Date Deposited: 08 Dec 2010 23:06
FoR Codes: 06 BIOLOGICAL SCIENCES > 0608 Zoology > 060899 Zoology not elsewhere classified @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960899 Flora, Fauna and Biodiversity of Environments not elsewhere classified @ 100%
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