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Thermal sensitivity during brood care was analysed in two Neotropical Camponotus ant species, related phylogenetically but disparate in ecology. Camponotus mus is dominant in temperate climates, whereas C. rufipes is dominant in subtropical climates. Sensitivity was assessed by first allowing workers to manifest their preference along a thermal gradient, and thereafter increasing the temperature of the nest floor continuously at a rate of 0.2 °C/min. The removal of brood by workers was recorded as an indicative response of upper thermal tolerance. Along a thermal gradient, while C. mus nurse workers exhibited a bimodal circadian rhythm of temperature preference to locate the brood, C. rufipes nurses selected an invariant temperature throughout the day. Irrespective of their thermal preferences, sensitivity to temperature changes in both species showed a conspicuous circadian rhythm. Its endogenous nature was supported by a free-run under constant darkness. In C. mus, instantaneous resetting by the light:dark cycle could also be demonstrated, and experiments suggest the involvement of one oscillator controlling thermal responses. At the middle of the light period when extreme environmental temperatures are expected, C. mus nurses exhibited the highest sensitivity (brood removal after an increase of 0.2 °C), while C. rufipes showed the lowest (removal after an increase of 6.7 °C). For both species, the time-course of thermal sensitivity during brood care suggests an adaptation to the wide and slight daily fluctuations undergone by temperature in temperate and tropical climates, respectively. © 1995.


Documento: Artículo
Título:Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates
Autor:Roces, F.; Núñez, JosuA.
Filiación:Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Ant; Brood; Camponotus; Circadian rhythm; Thermal sensitivity; Camponotus spp.; Camponotus; Camponotus mus; Camponotus rufipes; Formicidae; Hymenoptera; Mus; ant; brood care; circadian rhythm; temperature; thermal sensitivity; worker; adaptation; ant; circadian rhythm; environmental temperature; Hymenoptera; nurse; species; temperature; tropic climate; worker
Página de inicio:659
Página de fin:669
Título revista:Journal of Insect Physiology
Título revista abreviado:J. Insect Physiol.


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---------- APA ----------
Roces, F. & Núñez, JosuA. (1995) . Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates. Journal of Insect Physiology, 41(8), 659-669.
---------- CHICAGO ----------
Roces, F., Núñez, JosuA. "Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates" . Journal of Insect Physiology 41, no. 8 (1995) : 659-669.
---------- MLA ----------
Roces, F., Núñez, JosuA. "Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates" . Journal of Insect Physiology, vol. 41, no. 8, 1995, pp. 659-669.
---------- VANCOUVER ----------
Roces, F., Núñez, JosuA. Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates. J. Insect Physiol. 1995;41(8):659-669.