IEGEBA   24053
INSTITUTO DE ECOLOGIA, GENETICA Y EVOLUCION DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Thermogenesis in the Southern Masked Chafer, Cyclocephala signaticollis.
Autor/es:
ZERMOGLIO, P.F.; CASTELO, M.K.; LAZZARI, C.R.
Lugar:
York
Reunión:
Congreso; 10th European Congress of Entomology; 2014
Institución organizadora:
Royal Entomological Society
Resumen:
P { margin-bottom: 0.21cm; direction: ltr; color: rgb(0, 0, 0); widows: 2; orphans: 2; }
Temperature
constitutes a main factor affecting the life of insects. Despite
their poikilothermic nature, some insects are able of partially
regulating their body temperature. The occurrence of thermogenesis
has been reported in scarab beetles associated with flight, but also
with other activities or even rest. While keeping a higher body
temperature in cold environments has a direct effect on the
individual performance, its energetic cost is high. So, the
advantages of such an increment on temperate species remain unclear.
We investigated the occurrence of thermogenesis in a temperate
scarab, Cyclocephala
signaticollis,
an agricultural pest in American grasslands. Thermographic images
were taken from adult beetles subjected to 12h:12h L/D or constant
darkness regimes and the temperatures of the head, thorax and abdomen
were measured along several days. Beetles exposed to 12h:12h L/D
regime showed marked cycles of endothermy, warming up their thorax
during the early night. This increase reached up to 11.8 °C over the
ambient, producing a marked heterothermy. Beetles exposed to constant
darkness regime, although they remained active, ceased to exhibit
thermogenesis after the first night of experimentation. These results
unravel the existence of a thermogenesis rhythm that is exogenously
regulated by light in a temperate scarab species.
P { margin-bottom: 0.21cm; direction: ltr; color: rgb(0, 0, 0); widows: 2; orphans: 2; Temperature
constitutes a main factor affecting the life of insects. Despite
their poikilothermic nature, some insects are able of partially
regulating their body temperature. The occurrence of thermogenesis
has been reported in scarab beetles associated with flight, but also
with other activities or even rest. While keeping a higher body
temperature in cold environments has a direct effect on the
individual performance, its energetic cost is high. So, the
advantages of such an increment on temperate species remain unclear.
We investigated the occurrence of thermogenesis in a temperate
scarab, Cyclocephala
signaticollis,
an agricultural pest in American grasslands. Thermographic images
were taken from adult beetles subjected to 12h:12h L/D or constant
darkness regimes and the temperatures of the head, thorax and abdomen
were measured along several days. Beetles exposed to 12h:12h L/D
regime showed marked cycles of endothermy, warming up their thorax
during the early night. This increase reached up to 11.8 °C over the
ambient, producing a marked heterothermy. Beetles exposed to constant
darkness regime, although they remained active, ceased to exhibit
thermogenesis after the first night of experimentation. These results
unravel the existence of a thermogenesis rhythm that is exogenously
regulated by light in a temperate scarab species.