Journal ArticleDOI
Removal and subsequent ingestion of rivals' semen during copulation in a tree cricket
TLDR
It is suggested that rivals' semen is flushed out of the female?s sperm storage organ by the semen of the last male during post‐copulatory oro‐genital grooming.Abstract:
. A novel combination of adaptations resulting from sperm competition is demonstrated for the tree cricket Truljalia hibinonis (Matsumura) (Podoscirtinae: Gryllidae: Orthoptera). 87.5% of the semen of previous males is displaced onto the penis of the copulating male and is removed at the end of copulation. Semen thus removed is ingested during post-copulatory oro-genital grooming. No overt morphological adaptations for sperm removal were observed and, on the basis of anatomical evidence, it is suggested that rivals' semen is flushed out of the female?s sperm storage organ by the semen of the last male.read more
Citations
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Journal ArticleDOI
The function of nuptial feeding in insects: a review of empirical studies
TL;DR: Evidence for the potential ofnuptial gifts to function as either paternal investment, mating effort, or both is reviewed for each form of nuptial feeding in each insect taxon for which sufficient data are available.
Journal ArticleDOI
Complexity of seminal fluid: a review
TL;DR: The diversity of microorganismal, cellular and molecular components of seminal fluids can be interpreted in the light of emergence of co-adapted complexes, host–parasite coevolution, male–female arms races, sperm competition, pleiotropy and redundancy of function.
Book ChapterDOI
10 – Sperm Competition in Insects: Mechanisms and the Potential for Selection
Leigh W. Simmons,M.T. Siva-Jothy +1 more
TL;DR: The chapter focuses on the understanding of the mechanisms of sperm competition, which are essential for interpreting nonrandom patterns of paternity and for predicting the types of adaptations that sperm competition can generate.
Journal ArticleDOI
Sperm displacement without sperm transfer in drosophila melanogaster.
TL;DR: It is shown that when Drosophila melanogaster females are mated twice, the semen of the second male causes a reduction of the effective number of resident sperm from the previous mating, indicating that a sperm‐incapacitation process plays a role in the well‐documented phenomenon of sperm displacement (last‐male advantage) in this species.
Journal ArticleDOI
Analysing sperm competition data: simple models for predicting mechanisms.
TL;DR: Prospective models are developed for analysing sperm competition data so as to predict the underlying mechanisms determining paternity in multiply mated females and can be increased by manipulating the number of sperm transferred by each male.
References
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Journal ArticleDOI
Sperm competition and its evolutionary consequences in the insects
TL;DR: In this article, Simpson et al. describe a method to solve the problem of homonymity in Bee W l d 34, 14) and show that it works well in beekeeping.
Journal ArticleDOI
Dual Function of the Damselfly Penis: Sperm Removal and Transfer
TL;DR: The male of Calopteryx maculata (Beauvois) (Odonata) uses its penis not only to transfer sperm to the female but also to remove sperm deposited in the female's sperm storage organs from previous matings.
Journal ArticleDOI
Environmental Uncertainty and the Parental Strategies of Marsupials and Placentals
TL;DR: A comparison of marsupial and placental parental strategies as a test of predictions about the pattern of expenditure of parental effort suggests that marsupials have long been under selection imposed by frequent loss of offspring or conditions in which termination of offspring was frequently favored.