Phenotypic variation in male Calopteryx splendens damselflies: The role of wing pigmentation and body size in thermoregulation

Linda Laakso, Jaakko Ilvonen & Jukka Suhonen
For an ectothermic insect, its color and size are important determinants of body temperature: dark colors absorb heat more efficiently, while larger bodies require more heat to reach a certain temperature. These dark colors are expressed using melanin, which has been intimately linked with an insect’s thermoregulatory capabilities. Melanin is also linked with immune defense and is often used as a secondary sexual character in insects. There is a potential trade-off situation between thermoregulatory capabilities,...
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