Varying levels of female promiscuity in four Apodemus mice species

Bryja, Josef; Patzenhauerová, Hana; Albrecht, Tomáš; Mošanský, Ladislav; Stanko, Michał; Stopka, Pavel

doi:10.1007/s00265-008-0656-7

Cited by 39 publications

(48 citation statements)

References 65 publications

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“…A. agrarius also had longer apical hooks than A. sylvaticus; the difference was not considerable but still apparent. Similarly, in A. agrarius a slightly higher percentage of multiple paternity was found in the high vegetation season: A. agrarius 69.2%, A. sylvaticus 68.8%, however, in spring and summer together: it was in A. agrarius 58.8% and in A. sylvaticus 68.2% (Bryja et al 2008). Some smaller differences in the sperm life-span can also thus point to less pronounced differences in the risk of sperm competition.…”

Section: Discussionmentioning

confidence: 93%

“…The train of one male must catch up with the train of the previous male. The high percentage of multiple paternities in the field mice (Bryja et al 2008) testifies for this strategy. Sperm strategies are also related to the social behaviour.…”

Section: Discussionmentioning

confidence: 99%

“…In field mice, with the higher risk of sperm competition, the multiple paternity rate was found to be 69.2% in Apodemus agrarius (Pallas, 1771), 68.8% in A. sylvaticus (L., 1758), 56.3% in A. flavicollis (Melchior, 1834) and 45% in A. uralensis (Pallas, 1811) (former A. microps Kratochvíl et Rosický, 1952) (during high vegetation season) (Bryja et al 2008), while in the western house mouse (Mus domesticus Schwarz et Schwarz, 1943) the multiple paternity was in the range of values 23% (Dean et al 2006) and 26% (Firman & Simmons 2008) only.…”

Section: Introductionmentioning

confidence: 99%

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Changes in the curvature of sperm apical hooks in murine rodents

et al. 2011

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Sperm apical hooks in murine rodents play an important role in sperm competition. Apical hooks are more curved and longer in species with relatively larger testes, that is in species with a higher risk of sperm competition. The sperm can form aggregations, 'trains', that can move faster than individual sperm, thus reaching the egg earlier as was observed in Apodemus sylvaticus. The apical hook plays an important role for train formation. This study focuses on the changes in the curvature of sperm apical hooks during the final stages of spermiogenesis and stages before fertilization (sperm-life span). Apical hook curvatures of field mice (A. agrarius and A. sylvaticus) vary significantly between dormant and active sperm. In contrast, there are no significant differences among the stages in the eastern house mouse. Since there are high ranges of angle values in all stages, the mean angles of apical hook curvature are not appropriate for evaluating risk of sperm competiton. The ranges of angle values point to a level of flexibility of the apical hooks. The lengths of sperm hooks in individual species do not change during particular stages. The length and flexibility of the sperm apical hooks are important for the formation of sperm aggregations, thus these sperm characters indicate the risk of sperm competition and the sperm strategies in murine rodents.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in the curvature of sperm apical hooks in murine rodents

et al. 2011

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“…In the studies summarized, sperm competition risk is assessed using a variety of methods including data on mating systems, rates of extra-pair paternity, number of spermatophores recovered from female reproductive tracts (for some insect species), frequency of males adopting alternative reproductive tactics, female remating rates, reproductive behaviors, and sexual size dimorphism. Hosken (1997Hosken ( , 1998 and Lemaître et al Hosken (1997), Breed & Taylor (2000), Ramm et al (2005), Bryja et al (2008), Gomendio et al (2011) and Montoto et al (2011aMontoto et al ( , 2011b Rose et al (1997) and Tourmente et al (2011b) Primates Harcourt et al (1981Harcourt et al ( , 1995, Møller (1988), Gomendio & Roldan (1991), Kappeler (1997), Anderson & Dixon (2002), Nascimento et al (2008), Lemaître et al (2009) Indicates studies with broad taxonomic coverage.…”

Section: Sperm: Solders In the Battle For Fertilizationmentioning

confidence: 99%

Sperm wars and the evolution of male fertility

Simmons¹,

Fitzpatrick²

2012

Reproduction

306

343

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Females frequently mate with several males, whose sperm then compete to fertilize available ova. Sperm competition represents a potent selective force that is expected to shape male expenditure on the ejaculate. Here, we review empirical data that illustrate the evolutionary consequences of sperm competition. Sperm competition favors the evolution of increased testes size and sperm production. In some species, males appear capable of adjusting the number of sperm ejaculated, depending on the perceived levels of sperm competition. Selection is also expected to act on sperm form and function, although the evidence for this remains equivocal. Comparative studies suggest that sperm length and swimming speed may increase in response to selection from sperm competition. However, the mechanisms driving this pattern remain unclear. Evidence that sperm length influences sperm swimming speed is mixed and fertilization trials performed across a broad range of species demonstrate inconsistent relationships between sperm form and function. This ambiguity may in part reflect the important role that seminal fluid proteins (sfps) play in affecting sperm function. There is good evidence that sfps are subject to selection from sperm competition, and recent work is pointing to an ability of males to adjust their seminal fluid chemistry in response to sperm competition from rival males. We argue that future research must consider sperm and seminal fluid components of the ejaculate as a functional unity. Research at the genomic level will identify the genes that ultimately control male fertility.

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“…In highly promiscuous field mice (Apodemus) with documented multiple paternities (Bryja & Stopka 2005, Bryja et al 2008, Johnson et al 2007, where up to 60% of their sperm undergo synchronised spontaneous AR (Moore et al 2002, Johnson et al 2007, Clift et al 2009), every minute may count in the sperm race to fertilise the egg. Several molecular mechanisms may be involved in speeding up the fertilising process.…”

Section: Introductionmentioning

confidence: 99%

Progress of sperm IZUMO1 relocation during spontaneous acrosome reaction

Šebková¹,

Děd²,

Veselá³

et al. 2014

Reproduction

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It has been recently shown in mice that sperm undergo acrosome reaction (AR) by passing through cumulus cells; furthermore, the acrosome-reacted sperm can bind to zona pellucida and consequently fertilise the egg. During AR, the relocation of the primary fusion protein IZUMO1 into the equatorial segment is crucial for sperm-egg fusion. There is a high rate of spontaneous AR in rodents, with up to 60% in promiscuous species. The aim of this study was to clarify whether the IZUMO1 relocation in sperm after spontaneous and induced AR is the same, and whether there is a correlation between the speed of IZUMO1 relocation and species-specific mating behaviour in field mice. Immunofluorescent detection of IZUMO1 dynamics during the in vitro capacitation, spontaneous, calcium ionophore and progesterone-induced AR was monitored. Our results show that during spontaneous AR, there is a clear IZUMO1 relocation from the acrosomal cap to the equatorial segment, and further over the whole sperm head. In addition, there is positive tail tyrosine phosphorylation (TyrP) associated with hyperactive motility. Moreover, the beginning and the progress of IZUMO1 relocation and tail TyrP positively correlate with the level of promiscuity and the acrosome instability in promiscuous species. The findings that crucial molecular changes essential for sperm-egg fusion represented by dynamic movements of IZUMO1 also happen during spontaneous AR are vital for understanding fertilisation in mice.

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Varying levels of female promiscuity in four Apodemus mice species

Cited by 39 publications

References 65 publications

Changes in the curvature of sperm apical hooks in murine rodents

Changes in the curvature of sperm apical hooks in murine rodents

Sperm wars and the evolution of male fertility

Progress of sperm IZUMO1 relocation during spontaneous acrosome reaction

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