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23 January 2020 Saproxylic Cetoniidae (Coleoptera: Scarabaeoidea): A ‘Females' World’ or a Question of Dependence on Deadwood?
Sandra Martínez-Pérez, Gerardo Sanchez-Rojas, Eduardo Galante, Estefanía Micó
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We explored the dependence of some Cetoniidae species on saproxylic environments and microhabitats in a Mediterranean oak forest by analyzing species collected using different kinds of traps—log emergence, hollow emergence, and interception traps—and the sex ratio of the species in each trap. Comparing the sex ratio of the species collected via emergence versus interception was useful to unravel the degree of dependence on saproxylic microhabitats. Among the species studied, Cetonia aurataeformis Curti, 1913 (Coleoptera: Cetoniidae) was the only obligate tree hollow inhabitant. Special attention should thus be paid to the maintenance of tree hollows for the species' conservation in Mediterranean forests. A gradient of dependence on tree hollows was established from the more dependent Protaetia (Potosia) cuprea (Fabricius, 1775) (Coleoptera: Cetoniidae) and Protaetia (Potosia) opaca (Fabricius, 1787) (Coleoptera: Cetoniidae) to the less dependent Protaetia (Netocia) morio (Fabricius, 1781) (Coleoptera: Cetoniidae). All the latter species can be considered facultatively dependent, to varying degrees, on tree hollows. By contrast, the saproxylic affinity of Protaetia (Netocia) oblonga (Gory and Percheron, 1833) (Coleoptera: Cetoniidae), Tropinota squalida (Scopoli, 1783) (Coleoptera: Cetoniidae) and Oxythyrea funesta (Poda, 1761) (Coleoptera: Cetoniidae) was doubtful. Generally, the sex ratio of the studied species was female-biased. A possible explanation may be local male competition for females, suggesting the Cetoniinae is a female world. However, the range of difference in the female-biased sex ratio among species suggests it is important to explore other possible causes, such as differences in dispersal abilities.

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Sandra Martínez-Pérez, Gerardo Sanchez-Rojas, Eduardo Galante, and Estefanía Micó "Saproxylic Cetoniidae (Coleoptera: Scarabaeoidea): A ‘Females' World’ or a Question of Dependence on Deadwood?," Environmental Entomology 49(2), 288-295, (23 January 2020).
Received: 30 July 2019; Accepted: 21 December 2019; Published: 23 January 2020

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facultative tree hollow
Mediterranean oak forest
obligate tree hollow
saproxylic environment
sex ratio
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