Thermoregulation in endothermic dung beetles (Coleoptera: Scarabaeidae): Effect of body size and ecophysiological constraints in flight

Verdú, José R.; Arellano, Lucrecia; Numa, Catherine

doi:10.1016/j.jinsphys.2006.05.005

Cited by 88 publications

(79 citation statements)

References 20 publications

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“…For C. humectus hidalgoensis, this longevity implies an ability to endure two climatic extremes: the frequent frosts of winter and the extreme dryness of summer. Previous observations allow the classification of this subspecies as a freeze-avoiding (sensu Bale, 1993Bale, , 1996Bale, , 2002 and endothermic taxon (Verdú et al, 2006(Verdú et al, , 2007, and therefore, as a taxon that likely has the ability to supercool as overwintering strategy. Considering the environmental heterogeneity of an altitudinal gradient, it is hypothesized that different populations may have different thermotolerance strategies.…”

Section: Introductionmentioning

confidence: 93%

Chill tolerance variability within and among populations in the dung beetle Canthon humectus hidalgoensis along an altitudinal gradient in the mexican semiarid high plateau

Verdú

2011

Journal of Arid Environments

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Section: Introductionmentioning

confidence: 93%

Chill tolerance variability within and among populations in the dung beetle Canthon humectus hidalgoensis along an altitudinal gradient in the mexican semiarid high plateau

Verdú

2011

Journal of Arid Environments

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“…lugubris se encontró en los dos ecosistemas y todos los sitios de muestreo (Figura 6A), considerándole como una especie altamente sinantropogénica y factiblemente el escarabajo más resistente a la degradación humanas. El hábito nocturno de C. lugubris le permitió establecerse exitosamente en todos los usos de suelo, incluso los abiertos y altamente intervenidos, pues al restringir sus actividades durante la noche, mitiga los efectos negativos de elevar su temperatura corporal lo suficiente para producir un choque térmico durante el vuelo (Verdú et al, 2006). Según la proporción relativa de los gremios (Figura 5) y análisis de ordenamiento (Figura 6B), los telocópridos grandes del Bosque Siempre Verde y los telocópridos pequeños del Arbustal Deciduo fueron los gremios de mayor sensibilidad a la perturbación del hábitat, al distanciarse más de los usos de suelo más intervenidos.…”

Section: Análisis De Ordenamientounclassified

Comunidad de Escarabajos Coprófagos (Coleoptera: Scarabaeidae: Scarabaeinae) en Hábitats bajo Distinta Intensidad de Uso en Yuscarán, Honduras

Rivera

Cantarero

2015

Ceiba

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Resumen: Los recursos naturales en el Municipio de Yuscarán se encuentran bajo un continuo proceso de degradación producto de mal manejo del suelo, así como prácticas agrícolas y ganaderas intensivas. Los escarabajos coprófagos (Coleoptera: Scarabaeidae: Scarabaeinae) son insectos muy susceptibles a la perturbación del hábitat; por lo tanto, el objetivo de la investigación fue describir como la estructura de sus comunidades es modificada desde hábitats menos a más intervenidos, a través de diferentes usos del suelo, tomando en cuenta la intensidad de uso y su estructura vegetal. La investigación se realizó de junio a diciembre del 2012 en un Bosque Tropical Siempre Verde y un Arbustal Deciduo de Tierras Bajas, cada uno con dos zonas divididas en tres sitios de muestreo según el uso del suelo. Los escarabajos se recolectaron utilizando trampas de caída cebadas con estiércol de vaca. Se caracterizó la vegetación y se registraron parámetros abióticos por hábitat. Se capturaron 2,749 individuos pertenecientes a 9 tribus, 11 géneros y 21 especies. La abundancia promedio de escarabajos disminuyó más del 50% al intensificarse la intervención humana. En el Bosque Siempre Verde, las comunidades de escarabajos estuvieron conformadas principalmente por especialistas y generalistas forestales; en el Arbustal Deciduo, las comunidades estaban compuestas por especies generalistas y heliofílicas. Este estudio muestra como la intervención humana conlleva a la pérdida de riqueza, diversidad y abundancia de las comunidades de escarabajos del Bosque Siempre Verde. No obstante, la situación es inversa y más precaria en el Ecosistema Deciduo, donde los resultados indican que se puede estar llegando a una homogenización de fauna con hábitos generalistas producto del alto grado de intervención del hábitat.Palabras clave: Diversidad alfa, diversidad beta, estructura de comunidades, gremios, intervención humana, uso de suelo, Scarabaeinae. Dung Beetle (Coleoptera: Scarabaeidae:Scarabaeinae) Community in Habitats under Different Usage Intensity in Yuscarán, HondurasAbstract: The Municipality of Yuscarán is under continuous habitat degradation processes due to invasive agriculture and cattle practices. Dung beetles (Coleoptera: Scarabaeidae: Scarabaeinae) are sensitive to habitat disturbance. The objective of this study was to describe how the dung beetle community structure is modified from less to more perturbed habitats throughout three different landscapes, according to the intensity of land use and vegetation structure. The investigation took place from June to December 2012 in a Tropical Evergreen Pine Forest and in a Deciduous Woodland. Each forest type consisted of two different areas divided by 3 collection sites according to land use. Beetles were collected in pitfall traps baited with cow dung. Vegetation structure and abiotic parameters were determined per habitat. A total of 2,749 beetles were captured, belonging to 9 tribes, 11 genera, and 21 species. Mean beetle abundance was reduced by 50% due to increased human interventio...

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“…The standard metric for the precision of temperature regulation is the slope of the regression line relating T th with T a (e.g. Chown and Scholtz, 1993;Merrick and Smith, 2004;Morgan, 1987;Oertli, 1989;Stone and Willmer, 1989;Verdu et al, 2004;Verdu et al, 2006). While a simplistic regression approach such as this ignores much of the detail regarding an insect's thermoregulatory ability (Chown and Nicholson, 2004), it nevertheless provides a coarse index of thermoregulatory precision under the conditions of measurement.…”

Section: Temperature Regulation and Thermal Conductancementioning

confidence: 99%

“…The slopes are quite variable in other beetles that are measured as they fly into light traps or in experimental enclosures. They range from essentially zero to 0.64 in several species (Chown and Scholtz, 1993;Merrick and Smith, 2004;Morgan, 1987;Oertli, 1989;Verdu et al, 2004;Verdu et al, 2006). This variation shows that the slope of the temperature relationship provides limited information about the factors influencing thermoregulatory precision, because the slope is affected by the balance between heat production and heat loss, both of which are independently variable.…”

Section: Temperature Regulation and Thermal Conductancementioning

confidence: 99%

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Endothermy of dynastine scarab beetles (Cyclocephala colasi)associated with pollination biology of a thermogenic arum lily(Philodendron solimoesense)

Seymour

White

Gibernau

2009

Journal of Experimental Biology

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SUMMARYCyclocephala colasi beetles are facultative endotherms that spend most of their adult lives inside the inflorescences of Philodendron solimoesense, where ambient temperature (T a ) averages about 28°C due to floral thermogenesis. Measurements of respiration within a range of T a showed that active beetles became spontaneously endothermic at T a below 28°C but were rarely endothermic above it. There was no evidence of endothermy within the inflorescences, indicating that activities in the floral chamber can occur without the high energy expense of endothermy. Bouts of endothermy occurred at lower T a in respirometer chambers mainly in the evening, when the insects normally fly from one inflorescence to another, and during the night, when they normally eat and mate within the inflorescence. Patterns of endothermy in individual episodes were studied in non-flying beetles with respirometry and infrared thermal imaging. Heat was generated in the thorax by oscillatory waves of respiration that were coupled with thoracic temperature (T th ) increases. Stationary beetles could regulate T th at about 33°C independently of T a between 16 and 29°C. At T a =20°C, this represents a 116-fold increase in metabolic rate over resting, ectothermic values. Endothermy was clearly a requirement for flight, and beetles departing inflorescences warmed to about 30°C before take-off. During flight, T th was dependent on T a , decreasing from 37 to 28°C at T a of 37 to 20°C, respectively. The lowest T a at which flight could occur was about 20°C. Thermal conductance of stationary, endothermic beetles increased at higher metabolic rates, probably because of increased ventilatory heat loss.

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Thermoregulation in endothermic dung beetles (Coleoptera: Scarabaeidae): Effect of body size and ecophysiological constraints in flight

Cited by 88 publications

References 20 publications

Chill tolerance variability within and among populations in the dung beetle Canthon humectus hidalgoensis along an altitudinal gradient in the mexican semiarid high plateau

Chill tolerance variability within and among populations in the dung beetle Canthon humectus hidalgoensis along an altitudinal gradient in the mexican semiarid high plateau

Comunidad de Escarabajos Coprófagos (Coleoptera: Scarabaeidae: Scarabaeinae) en Hábitats bajo Distinta Intensidad de Uso en Yuscarán, Honduras

Endothermy of dynastine scarab beetles (Cyclocephala colasi)associated with pollination biology of a thermogenic arum lily(Philodendron solimoesense)

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