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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Pairing and insemination patterns in a giant weta (Deinacrida rugosa: Orthoptera; Anostostomatidae)
Author(s): Kelly, Clint D
Bussiere, Luc
Gwynne, Darryl T
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Keywords: Sexual size dimorphism
Assortative mating
Sperm competition risk
Spermatophore transfer
Scramble competition
Mate choice
Sexual behavior in animals
Sexual dimorphism (Animals)
Issue Date: Sep-2010
Date Deposited: 28-Jun-2013
Citation: Kelly CD, Bussiere L & Gwynne DT (2010) Pairing and insemination patterns in a giant weta (Deinacrida rugosa: Orthoptera; Anostostomatidae). Journal of Ethology, 28 (3), pp. 483-489.
Abstract: Positive size assortative mating can arise if either one or both sexes prefer bigger mates or if the success of larger males in contests for larger females leaves smaller males to mate with smaller females. Moreover, body size could not only influence pairing patterns before copulation but also the covariance between female size and size of ejaculate (number of spermatophores) transferred to a mate. In this field study, we examine the pre-copulatory mate choice, as well as insemination, patterns in the Cook Strait giant weta (Deinacrida rugosa). D. rugosa is a large orthopteran insect that exhibits strong female-biased sexual dimorphism, with females being nearly twice as heavy as males. Contrary to the general expectation of male preference for large females in insects with female-biased size dimorphism, we found only weak support for positive size assortative mating based on size (tibia length). Interestingly, although there was no correlation between male body size and the number of spermatophores transferred, we did find that males pass more spermatophores to lighter females. This pattern of sperm transfer does not appear to be a consequence of those males that mate heavier females being sperm depleted. Instead, males may provide lighter females with more spermatophores perhaps because these females pose less of a sperm competition risk to mates.
DOI Link: 10.1007/s10164-010-0211-7
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