Thermoregulation and Habitat Preference in Two Wing Color Forms of Mnais Damselflies (Odonata: Calopterygidae)(Behavior Biology)

概要

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Thoracic temperatures of Mnais damselflies with wing color dimorphism (pale orange vs hyaline) were compared with ambient and radiation temperatures. All sexually immature adults remained on perches in sunflecks in deciduous forests. They controlled their thoracic temperature against radiant heat load in similar manner. After maturation, territorial males, with orange wings, were seen to spend much time perching in open streams, increasing the degree of thermoregulation. They changed some physiological properties, probably due to the quantity of haemolymph because of decline in water content of the thorax. Although there was a similar decline in water content of mature females, with orange wings, change in the body temperature did not show higher degree of thermoregulation because of their perching behavior for mating in open streams. Both sexes of mature insects with hyaline wings were restricted to deciduous forests. Their water content ratio did not vary with ageing. The response of controlling thoracic temperature to ambient and radiation temperature was similar to that in immature adults. The high degree of thermoregulation clearly allowed mature insects with orange wings to be active under direct sunlight.
1991-10-15