Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates

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 worker...

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Autores principales: Roces, Flavio, Núñez, Josué Antonio
Publicado: 1995
Materias:
Ant
Mus
ant
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221910_v41_n8_p659_Roces
http://hdl.handle.net/20.500.12110/paper_00221910_v41_n8_p659_Roces
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spelling paper:paper_00221910_v41_n8_p659_Roces2023-06-08T14:47:08Z Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates Roces, Flavio Núñez, Josué Antonio 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 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. Fil:Roces, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Núñez, JosuA. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1995 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221910_v41_n8_p659_Roces http://hdl.handle.net/20.500.12110/paper_00221910_v41_n8_p659_Roces
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Roces, Flavio
Núñez, Josué Antonio
Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates
topic_facet 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
description 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.
author Roces, Flavio
Núñez, Josué Antonio
author_facet Roces, Flavio
Núñez, Josué Antonio
author_sort Roces, Flavio
title Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates
title_short Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates
title_full Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates
title_fullStr Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates
title_full_unstemmed Thermal sensitivity during brood care in workers of two Camponotus ant species: Circadian variation and its ecological correlates
title_sort thermal sensitivity during brood care in workers of two camponotus ant species: circadian variation and its ecological correlates
publishDate 1995
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221910_v41_n8_p659_Roces
http://hdl.handle.net/20.500.12110/paper_00221910_v41_n8_p659_Roces
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