Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions

Synchronized state of activity and rest might be attained by mechanisms of entrainment and masking. Most zeitgebers not only act to entrain but also to mask circadian rhythms. Although the light-dark (LD) cycle is the main zeitgeber of circadian rhythms in marmosets, social cues can act as weaker...

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Principais autores:	Melo, Paula, Gonçalves, Bruno, Menezes, Alexandre, Azevedo, Carolina
Formato:	article
Idioma:	eng
Publicado em:	Informa Healthcare
Assuntos:	Circadian activity Correlation Marmoset Social cues Social synchronization
Endereço do item:	https://repositorio.ufrn.br/jspui/handle/123456789/24708
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spelling	ri-123456789-247082021-11-09T18:05:26Z Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions Melo, Paula Gonçalves, Bruno Menezes, Alexandre Azevedo, Carolina Circadian activity Correlation Marmoset Social cues Social synchronization Synchronized state of activity and rest might be attained by mechanisms of entrainment and masking. Most zeitgebers not only act to entrain but also to mask circadian rhythms. Although the light-dark (LD) cycle is the main zeitgeber of circadian rhythms in marmosets, social cues can act as weaker zeitgebers. Evidence on the effects of social entrainment in marmosets has been collected in isolated animals or in pairs where activity is not individually recorded. To characterize the synchronization between the daily activity profiles of individuals in groups under LD conditions, the motor activity of animals from five groups was continuously monitored using actiwatches for 15 days during the 5th, 8th, and 11th months of life of juveniles. Families consisting of twins (4 <,/1 <<) and their parents were maintained under controlled lighting (LD 12:12 h), temperature, and humidity conditions. Synchronization was evaluated through the synchrony between the circadian activity profiles obtained from the pearson correlation index between possible pairs of activity profiles in the light and dark phases. We also calculated the phase-angle differences between the activity onset of one animal in relation to the activity onset of each animal in the group ( on). A similar procedure was performed for activity offset ( off). By visual analysis, the correlation between the activity profiles of individuals within each family was stronger than that of individuals from different families. A mixed-model analysis showed that within the group, the correlation was stronger between twins than between twins and their parents in all families, except for the family in which both juveniles were males. Because a twin is an important social partner for juveniles, a sibling is likely to have a stronger influence on its twin’s activity rhythm than other family members. Considering only the light phase, the second strongest correlation was observed between the activity profiles of the individuals in the reproductive pair. Regarding the parameters on and off, the juvenile/juvenile dyad had lower values than the other dyads, but these differences did not reach statistical significance in relation to all dyads. Comparing the results of the on and off, and correlation indices, we suggest that the latter could detect differences between the animals that were not observed in the results of the phase-angle differences. These differences could be related to changes that occur during the active phase but not only in a particular phase, such as the temporal changes during the activity phase that characterize unimodal or bimodal patterns. Based on the differences in the correlations between individuals subjected to the same LD routine, we suggest that social cues modulate the circadian activity profiles of marmosets as a result of interactions between the animals within each group. Future studies are necessary to characterize the mechanisms of synchronization that are involved in this social modulation 2018-02-05T21:11:43Z 2018-02-05T21:11:43Z 2013 article MELO, Paula et al. Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions. Chronobiology International, v. 30, p. 818-827, 2013. Disponível em <http://www.tandfonline.com/doi/full/10.3109/07420528.2013.767823>. Acesso em: 20 nov. 2017. 1525-6073 https://repositorio.ufrn.br/jspui/handle/123456789/24708 10.3109/07420528.2013.767823 eng Acesso Aberto application/pdf Informa Healthcare
institution	Repositório Institucional
collection	RI - UFRN
language	eng
topic	Circadian activity Correlation Marmoset Social cues Social synchronization
spellingShingle	Circadian activity Correlation Marmoset Social cues Social synchronization Melo, Paula Gonçalves, Bruno Menezes, Alexandre Azevedo, Carolina Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions
description	Synchronized state of activity and rest might be attained by mechanisms of entrainment and masking. Most zeitgebers not only act to entrain but also to mask circadian rhythms. Although the light-dark (LD) cycle is the main zeitgeber of circadian rhythms in marmosets, social cues can act as weaker zeitgebers. Evidence on the effects of social entrainment in marmosets has been collected in isolated animals or in pairs where activity is not individually recorded. To characterize the synchronization between the daily activity profiles of individuals in groups under LD conditions, the motor activity of animals from five groups was continuously monitored using actiwatches for 15 days during the 5th, 8th, and 11th months of life of juveniles. Families consisting of twins (4 <,/1 <<) and their parents were maintained under controlled lighting (LD 12:12 h), temperature, and humidity conditions. Synchronization was evaluated through the synchrony between the circadian activity profiles obtained from the pearson correlation index between possible pairs of activity profiles in the light and dark phases. We also calculated the phase-angle differences between the activity onset of one animal in relation to the activity onset of each animal in the group ( on). A similar procedure was performed for activity offset ( off). By visual analysis, the correlation between the activity profiles of individuals within each family was stronger than that of individuals from different families. A mixed-model analysis showed that within the group, the correlation was stronger between twins than between twins and their parents in all families, except for the family in which both juveniles were males. Because a twin is an important social partner for juveniles, a sibling is likely to have a stronger influence on its twin’s activity rhythm than other family members. Considering only the light phase, the second strongest correlation was observed between the activity profiles of the individuals in the reproductive pair. Regarding the parameters on and off, the juvenile/juvenile dyad had lower values than the other dyads, but these differences did not reach statistical significance in relation to all dyads. Comparing the results of the on and off, and correlation indices, we suggest that the latter could detect differences between the animals that were not observed in the results of the phase-angle differences. These differences could be related to changes that occur during the active phase but not only in a particular phase, such as the temporal changes during the activity phase that characterize unimodal or bimodal patterns. Based on the differences in the correlations between individuals subjected to the same LD routine, we suggest that social cues modulate the circadian activity profiles of marmosets as a result of interactions between the animals within each group. Future studies are necessary to characterize the mechanisms of synchronization that are involved in this social modulation
format	article
author	Melo, Paula Gonçalves, Bruno Menezes, Alexandre Azevedo, Carolina
author_facet	Melo, Paula Gonçalves, Bruno Menezes, Alexandre Azevedo, Carolina
author_sort	Melo, Paula
title	Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions
title_short	Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions
title_full	Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions
title_fullStr	Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions
title_full_unstemmed	Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions
title_sort	socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions
publisher	Informa Healthcare
publishDate	2018
url	https://repositorio.ufrn.br/jspui/handle/123456789/24708
work_keys_str_mv	AT melopaula sociallyadjustedsynchronyintheactivityprofilesofcommonmarmosetsinlightdarkconditions AT goncalvesbruno sociallyadjustedsynchronyintheactivityprofilesofcommonmarmosetsinlightdarkconditions AT menezesalexandre sociallyadjustedsynchronyintheactivityprofilesofcommonmarmosetsinlightdarkconditions AT azevedocarolina sociallyadjustedsynchronyintheactivityprofilesofcommonmarmosetsinlightdarkconditions
_version_	1773962253299613696

Socially adjusted synchrony in the activity profiles of common marmosets in light-dark conditions

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