Reference : Do Spermathecal Morphology And Inter-Mating Interval Influence Paternity In The Polyandr...
Scientific journals : Article
Life sciences : Entomology & pest control
http://hdl.handle.net/2268/18951
Do Spermathecal Morphology And Inter-Mating Interval Influence Paternity In The Polyandrous Beetle Tribolium Castaneum?
English
Bernasconi, Giorgina [> > > >]
Brostaux, Yves mailto [Université de Liège > > Gembloux Agro-Bio Tech >]
Meyer, Eric P. [> > > >]
Arnaud, Ludovic [> > > >]
2006
Behaviour
BRILL
143
5
643-658
Yes (verified by ORBi)
International
0005-7959
Leiden
Pays-Bas
[en] reproduction ; sexual selection ; sperm storage
[en] In polyandrous insects, postcopulatory sexual selection is a pervasive evolutionary force favouring male and female traits that allow control of offspring paternity. Males may influence paternity through adaptations for sperm competition, and females through adaptations facilitating cryptic female choice. Yet, the mechanisms are often complex, involving behaviour, physiology or morphology, and they are difficult to identify. In red flour beetles (Tribolium castaneum), paternity varies widely, and evidence suggests that both male and female traits influence the outcome of sperm competition. To test the role of spermathecal morphology and of sperm storage processes on the outcome of sperm competition, we mated each of 26 virgin females with two males, one of which carrying a phenotypic marker to assign
offspring paternity. We manipulated the interval between mating with the first and the second male, to create different conditions of sperm storage (overlapping and non-overlapping) in the female reproductive tract. To investigate the role of sperm storage more closely, we examined the relationship between paternity and spermathecal morphology in a subset of 14 experimental females. In addition, we also characterized variation in spermathecal morphology in three different strains, wildtype, Chicago black and Reindeer. No significant influence of the intermating interval was found on the paternity of the focal male, although the direction of the difference was in the expected direction of higher last male paternity for longer intervals. Moreover, paternity was not significantly associated with spermathecal morphology, although spermathecal volume, complexity, and tubule width varied significantly and substantially among individuals in all investigated strains.
Swiss National Science Foundation ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/18951
10.1163/156853906776759538
http://brill.publisher.ingentaconnect.com/content/brill/beh/2006/00000143/00000005/art00006

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