title: Female but not male zebra finches adjust heat output in response to increased incubation demand.
abstract: In many incubating birds, heat transfer from parent to egg is facilitated by the brood patch, an area of ventral abdominal skin that becomes highly vascularised, swells and loses its down feathers around the time of laying. Only the female develops a brood patch in most passerine species, but males of some species can incubate and maintain the eggs at similar temperatures to females even without a brood patch. Here we used a novel application of infrared thermography to examine sex differences in parental care from a physiological perspective. Using incubating male and female zebra finches (Taeniopygia guttata), a species in which the male lacks a brood patch, we measured the surface temperature of the ventral plumage overlying the abdomen and a reference area that does not contact the eggs (thorax) twice per pair. In half of the pairs, clutch size was experimentally enlarged between the two sets of measurements to increase incubation demand. We found that the temperature differential between abdomen and thorax plumage was greater in females than in males, and that abdomen plumage was warmer after clutch enlargement than before in females but not in males. These findings are consistent with morphological sex differences in brood patch development and suggest that male and female zebra finches differ in the way they regulate abdomen versus general body surface temperature in response to variation in incubation demand.
authors.affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ, UK.
authors.forename: Davina L
authors.initials: DL
authors.lastname: Hill
authors.forename: Jan
authors.initials: J
authors.lastname: Lindström
authors.forename: Dominic J
authors.initials: DJ
authors.lastname: McCafferty
authors.forename: Ruedi G
authors.initials: RG
authors.lastname: Nager
mesh_terms: D000818:Animals; D001833:Body Temperature Regulation; D052284:Clutch Size; D005260:Female; D046369:Finches / Q000502:physiology*; D008297:Male; D009425:Nesting Behavior; D012727:Sex Characteristics
keywords: Brood patch; Clutch size manipulation; IRT; Infrared thermography; Taeniopygia guttata; parental care