Differences in the reproductive behaviour and larval development of two Canthon rutilans subspecies reinforce their thermal regional segregation
Two dung beetle subspecies of Canthon rutilans Castelnau (Coleoptera: Scarabaeidae, Scarabaeinae), C. rutilans rutilans and C. rutilans cyanescens, inhabit different environmental temperature conditions in southern Brazil. We developed a laboratory breeding experiment with 60 pairs of individualsof...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/229343 |
| Acceso en línea: | http://hdl.handle.net/10261/229343 |
| Access Level: | acceso abierto |
| Palabra clave: | Dung beetles Life cycle Ecophysiology Ethology Thermal adaptation Coleoptera Scarabaeidae Canthon rutilans Temperatures Scarabaeinae Breeding experiment Subspecies |
| Sumario: | Two dung beetle subspecies of Canthon rutilans Castelnau (Coleoptera: Scarabaeidae, Scarabaeinae), C. rutilans rutilans and C. rutilans cyanescens, inhabit different environmental temperature conditions in southern Brazil. We developed a laboratory breeding experiment with 60 pairs of individualsof the two subspecies at five temperature conditions (from 15 to 35°C) to compare the influence oftemperature on the behaviour of adults and the development of larvae. The behavioural patterns ofthe adults in both subspecies differ according to temperature. The size of food balls was smaller andlighter inC. rutilans cyanescens. Although temperature did not influence the feeding behaviour (mea-sured as the number of food balls made), reproductive behaviour (measured as the number of broodballs made by pair) was significantly lower at 15°C for both subspecies. Besides that, brood balls fromC. rutilans rutilanswere bigger and heavier at lower temperatures. The number of offspring and thetime of emergence depend on temperature too. However, the weight of the offspring and the longev-ity of adults depend on the subspecies and temperature treatment. These results demonstrate that thesubspecies have different thermal adaptations:C. rutilans rutilanshas reproductive behaviouradapted to living under colder and broader conditions thanC. rutilans cyanescens. |
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