Endothermy in the temperate scarab Cyclocephala signaticollis
| Autor: | Marcela Karina Castelo, Paula Zermoglio, Claudio R. Lazzari |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Male
0106 biological sciences Physiology Biología DYNASTINAE THERMOGENESIS Zoology Biology 010603 evolutionary biology 01 natural sciences Body Temperature Ciencias Biológicas Temperate climate Animals THERMAL BIOLOGY Dynastinae Maximum temperature Thermogenesis biology.organism_classification Coleoptera 010602 entomology Animal ecology Insect Science COLEOPTERA Female PEST analysis Cyclocephala CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | Journal of Insect Physiology. 108:10-16 |
| ISSN: | 0022-1910 |
| DOI: | 10.1016/j.jinsphys.2018.04.012 |
| Popis: | 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. Fil: Zermoglio, Paula Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina Fil: Castelo, Marcela Karina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina Fil: Lazzari, Claudio Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universite de Tours; Francia |
| Databáze: | OpenAIRE |
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