Among- and within-population variation in outcrossing rate of a mixed-mating freshwater snail

Jokela, Jukka; Wiehn, Jürgen; Kopp, Kirstin

doi:10.1038/sj.hdy.6800851

Cited by 15 publications

(20 citation statements)

References 45 publications

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“…This indirect approach also allows the magnitude of inbreeding depression to be conveniently compared among populations. Hence, in several evolutionary and ecological studies, levels of late‐stage inbreeding depression have been estimated using this method (Keller & Waller 2002; Hodgins & Barrett 2006; Jokela et al . 2006; Edmands 2007; Kubota et al .…”

Section: Introductionmentioning

confidence: 99%

Interpopulation variation in mating system and late‐stage inbreeding depression in Magnolia stellata

et al. 2009

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Inbreeding has the potential to cause evolutionary changes in populations, although these changes are likely to drive populations to extinction through inbreeding depression and reductions in genetic diversity. We investigated the mating system and late-stage inbreeding depression (delta) in 10 populations of Magnolia stellata using nine microsatellite markers and evaluated the effects of population size and the degree of population isolation through inbreeding and inbreeding depression on the persistence of populations. The outcrossing rates were very similar (approximately 0.7) among populations, but the correlations of paternity, fractions of biparental inbreeding and inbreeding coefficients at the seed stage (F(S)) varied among populations, suggesting that the level of outcrossing was similar among populations, while the quality of it was not. A significant negative correlation was detected between F(S) and population size. The average value of delta was 0.709, and the values in six of the 10 populations were significant. The values of delta differed among populations, although clear relationships with population size and the degree of population isolation were not detected. However, in one population, which was very small and located in the edge of the species' range, we obtained a very low value of delta (-0.096), which may be indicative of purging or the fixation of deleterious alleles. Existing M. stellata populations that are small (and thus might be expected to have higher frequencies of inbreeding) and have large values of delta may be in danger of declining, even if the populations are located within the central region of the species' range.

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Section: Introductionmentioning

confidence: 99%

Interpopulation variation in mating system and late‐stage inbreeding depression in Magnolia stellata

et al. 2009

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“…Selfing is predicted to predominate when there are high costs for the male function or for mate searching, even though selfing may lead to a loss of heterozygosity (e.g. Jarne and Städler 1995;Jokela et al 2006). Overall, the higher efficiency of gene transmission through selfing compared to outcrossing is thought to be counterbalanced by inbreeding depression (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…producing selfed or outcrossed offspring (e.g. Henry et al 2005;Jokela et al 2006). A few studies showed that individuals can also perform mixed fertilisation, i.e.…”

Section: Introductionmentioning

confidence: 99%

The fate of received sperm in the reproductive tract of a hermaphroditic snail and its implications for fertilisation

et al. 2008

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Multiple mating, sperm storage and internal fertilisation enhance sperm competition. The great pond snail can use stored sperm for over three months, and frequently mates with different partners. This hermaphrodite, Lymnaea stagnalis, can also selffertilise and often produces egg masses containing both selfed and outcrossed eggs. Hence, a sperm recipient may exert considerable control over paternity. Using microsatellite markers, we show that when allosperm are present, all genotyped eggs are cross-fertilised. We also find that sperm have the opportunity to compete, because double matings lead on average to equal paternity for each sperm donor. This indicates that received sperm are randomly mixed in storage. To gain further insight into the mechanisms underlying the process of sperm storage, digestion and utilisation, we investigated the fate of donated sperm at different times after copulation. We find that within 3 h after transfer most sperm have been transported into the sperm-digesting organ. Fluorescent labelling of sperm in histological sections further reveals that allosperm are not stored in the fertilisation pouch, but upstream in either the hermaphroditic duct, seminal vesicles, or ovotestis. Besides contributing to the understanding of the mechanisms underlying sperm competition and/or cryptic sperm choice, this study shows that mixed mating cannot be treated as a separate issue in hermaphroditic animals.

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“…Hatching success was determined after 2 weeks (Jokela et al 2006) by recording hatched snails, undeveloped eggs, and developed but not hatched embryos in the egg clutch using a stereomicroscope and analysed as mean hatched eggs (%) per treatment. To quantify hatching success for B. tentaculata, eight egg-clutches per replicate and treatment was photographed after 3 weeks (Cather and Verdonk 1974) recording undeveloped eggs and developed but not hatched embryos by comparing the images before and after the 2 weeks.…”

Section: Methodsmentioning

confidence: 99%

Effects of 17α-ethinylestradiol on individual life-history parameters and estimated population growth rates of the freshwater gastropods Radix balthica and Bithynia tentaculata

et al. 2011

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Studies of aquatic environments exposed to 17α-ethinylestradiol (EE2) have demonstrated detrimental effects on fish communities. However, much less is known about effects on macro-invertebrates and especially how long-term exposure may affect critical life stages and ultimately population dynamics. We studied the effects of EE2 on relevant endpoints for population growth in two common freshwater gastropods, Radix balthica and Bithynia tentaculata, that differ in reproductive, foraging and anti-predator strategies and endocrine systems. We quantified critical life-history parameters (mortality, somatic growth rate, days to and size at first reproduction, egg production and hatching success) in a concentration-response, life cycle experiment. The two species responded to EE2 exposure in different ways, B. tentaculata showing a significantly lower somatic growth rate and R. balthica a higher somatic growth rate. However, the magnitudes of the effects were small and EE2 exposure did not have any significant effect on estimated population growth rates for the two snail species. The significant effects of EE2 on individual endpoints, but not on population growth rate for both species, emphasise the importance of evaluating higher level effects from long-term exposure studies.

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Among- and within-population variation in outcrossing rate of a mixed-mating freshwater snail

Cited by 15 publications

References 45 publications

Interpopulation variation in mating system and late‐stage inbreeding depression in Magnolia stellata

Interpopulation variation in mating system and late‐stage inbreeding depression in Magnolia stellata

The fate of received sperm in the reproductive tract of a hermaphroditic snail and its implications for fertilisation

Effects of 17α-ethinylestradiol on individual life-history parameters and estimated population growth rates of the freshwater gastropods Radix balthica and Bithynia tentaculata

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