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Abstract:

The increase in body temperature over that of the environment has been frequently reported in insects, in particular in relation with flight activity. Scarab beetles of the genus Cyclocephala living in tropical areas are known to exploit the heat produced by thermogenic plants, also producing heat by endothermy. Here, we report the first case of endothermy in a species of this genus living in a temperate region, Cyclocephala signaticollis. We characterised the phenomenon in this beetle using infrared thermography and exposing them to different thermal conditions. We evaluated the frequency of endothermic bouts, the nature of their periodic occurrence and their association with the activity cycles of the beetles. We found that endothermy occurs in both males and females in a cyclic fashion, at the beginning of the night, around 21:00 local time. The mean temperature increase was of 9 °C, and the mean duration of the bouts was 7 min. During endothermic bouts, the temperature of the thorax was on average 3.6 °C higher than that of the head and 4.8 °C above that of the abdomen. We found no differences between females and males in the maximum temperature attained and in the duration of the endothermy bouts. The activity period of the beetles extends throughout the whole night, with maximum activity between 22:00 and 23:00. By subjecting the beetles to different light regimes we were able to determine that the rhythm of endothermy is not controlled by the circadian system. Finally, we experimentally tested if by performing endothermy the scarabs try to reach a particular body temperature or if they invest a given amount of energy in heating up, instead. Our results indicate that at lower ambient temperature beetles show higher increase in body temperature, and that endothermy bouts last longer than at relatively higher ambient temperatures. We discuss our findings in relation to the ecology and behaviour of this beetle pest. © 2018 Elsevier Ltd

Registro:

Documento: Artículo
Título:Endothermy in the temperate scarab Cyclocephala signaticollis
Autor:Zermoglio, P.F.; Castelo, M.K.; Lazzari, C.R.
Filiación:Departamento de Ecología, Genética y Evolución, Instituto IEGEBA (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Institut de Recherche sur la Biologie de l'Insecte, UMR 7261 CNRS, Université de Tours, France
Palabras clave:Coleoptera; Dynastinae; Thermal biology; Thermogenesis; Coleoptera; Dynastinae; Hexapoda; Scarabaeidae; Scarabaeus
Año:2018
Volumen:108
Página de inicio:10
Página de fin:16
DOI: http://dx.doi.org/10.1016/j.jinsphys.2018.04.012
Título revista:Journal of Insect Physiology
Título revista abreviado:J. Insect Physiol.
ISSN:00221910
CODEN:JIPHA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221910_v108_n_p10_Zermoglio

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Citas:

---------- APA ----------
Zermoglio, P.F., Castelo, M.K. & Lazzari, C.R. (2018) . Endothermy in the temperate scarab Cyclocephala signaticollis. Journal of Insect Physiology, 108, 10-16.
http://dx.doi.org/10.1016/j.jinsphys.2018.04.012
---------- CHICAGO ----------
Zermoglio, P.F., Castelo, M.K., Lazzari, C.R. "Endothermy in the temperate scarab Cyclocephala signaticollis" . Journal of Insect Physiology 108 (2018) : 10-16.
http://dx.doi.org/10.1016/j.jinsphys.2018.04.012
---------- MLA ----------
Zermoglio, P.F., Castelo, M.K., Lazzari, C.R. "Endothermy in the temperate scarab Cyclocephala signaticollis" . Journal of Insect Physiology, vol. 108, 2018, pp. 10-16.
http://dx.doi.org/10.1016/j.jinsphys.2018.04.012
---------- VANCOUVER ----------
Zermoglio, P.F., Castelo, M.K., Lazzari, C.R. Endothermy in the temperate scarab Cyclocephala signaticollis. J. Insect Physiol. 2018;108:10-16.
http://dx.doi.org/10.1016/j.jinsphys.2018.04.012