Selfing, Outcrossing, and Mixed Mating in the Freshwater Snail Physa heterostropha: Lifetime Fitness and Inbreeding Depression

Wethington, Amy R.; Dillon, Robert T.

doi:10.2307/3226896

Cited by 54 publications

(56 citation statements)

References 33 publications

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“…These results are in agreement with those in a natural population from the same area (0.921 in Jarne et al, 2000). Wethington and Dillon (1997) found a rather lower value (0.385), but this was under laboratory conditions with North-American individuals. Our estimates based on F is (average t F is : 0.89) were close to those derived from progeny arrays.…”

Section: Discussionsupporting

confidence: 82%

“…This might be interpreted as evidence of limited inbreeding depression. However, this would be surprising since strong inbreeding depression has been consistently detected in P. acuta (Wethington and Dillon, 1997;Jarne et al, 2000;Henry et al, 2003). Moreover, in the partially selfing population Lam12, F is did not differ from zero, suggesting the occurrence of inbreeding depression between the juvenile and adult stages.…”

Section: Discussionmentioning

confidence: 94%

“…Since P. acuta stores sperm after copulation (eg Wethington and Dillon, 1997), preferentially outcrosses (Jarne et al, 2000;Tsitrone et al, 2003b;Bousset et al, 2004) and G 0 individuals were placed in optimal conditions for egg laying, we assumed that the estimated outcrossing rate reflects that under natural conditions.…”

Section: Methodsmentioning

confidence: 99%

“…This is particularly likely since inbreeding depression is strong in juvenile P. acuta (Wethington and Dillon, 1997;Jarne et al, 2000;Henry et al, 2003;Tsitrone et al, 2003b). The t m value should therefore explain population-level variation in the proportion of fertile G 0 individuals (p fert ), and t mf should explain family-level variation in the number of eggs per capsule (N egg ), incubating time (t incub ) and survival at 7 days (S 7 d ).…”

Section: Selfing Rates and Fitness Traitsmentioning

confidence: 99%

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Partial selfing, ecological disturbance and reproductive assurance in an invasive freshwater snail

et al. 2005

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Although reproductive assurance (RA) might play a central role in the evolution of the selfing rate, this hypothesis has never been seriously investigated in an hermaphroditic animal. We studied the mating system of the freshwater snail Physa acuta in which the availability of mating partners might be highly variable, because this species is an efficient colonizer occupying unstable habitats. A total of 11 populations differing in ecological disturbance regime (water level, openness) and snail densities were monitored over 2 years. The outcrossing rate was estimated in ca 10 families per population using microsatellite markers and the progenyarray approach. Components of fecundity and survival were recorded for each progeny. Predominant outcrossing (t m ¼ 0.94) was detected, with a few individuals (4%) purely selfing. The outcrossing rate did not explain among-family variation in fitness components. None of the predictions formulated under the RA hypothesis were verified: (i) selfing was related neither to disturbed habitats, nor to temporal density fluctuations, (ii) it was positively related to population density, (iii) it co-occurred with multiple paternity, and (iv) it did not induce delayed reproduction. Explanations for these negative results are discussed in light of other arguments supporting the RA hypothesis in P. acuta, as well as alternative theories explaining the occurrence of partial selfing, as either a genetically fixed or plastic trait. Heredity (2005) 95, 428-436.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Selfing Rates and Fitness Traitsmentioning

confidence: 99%

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Partial selfing, ecological disturbance and reproductive assurance in an invasive freshwater snail

et al. 2005

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“…The male partner is sometimes prevented from mating by the female partner retreating into its shell. The sperm transferred during mating is stored and might be used for several weeks for ova fertilization, either in highly outcrossing (VianeyLiaud, 1998;Wethington & Dillon, 1997) or highly selfing (De Larambergue, 1939) species, although the temporal dynamics of allosperm exhaustion has not been evaluated in B. pfeifferi.…”

Section: (I) the Species Studiedmentioning

confidence: 99%

Prior selfing and the selfing syndrome in animals: an experimental approach in the freshwater snailBiomphalaria pfeifferi

et al. 2008

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SummaryInbreeding species of hermaphroditic animals practising copulation have been characterized by few copulations, no waiting time (the time that an isolated individual waits for a partner before initiating reproduction compared with paired individuals) and limited inbreeding (self-fertilization) depression. This syndrome, which has never been fully studied before in any species, is analysed here in the highly selfing freshwater snail Biomphalaria pfeifferi. We conducted an experiment under laboratory conditions over two generations (G 1 and G 2 ) using snails sampled from two populations (100 individuals per population). G 1 individuals were either isolated or paired once a week (potentially allowing for crosses), and monitored during 29 weeks for growth, fecundity and survival. Very few copulations were observed in paired snails, and there was a positive correlation in copulatory activity (e.g. number of copulations) between the male and female sexual roles. The waiting time was either null or negative, meaning that isolated individuals initiated reproduction before paired ones. G 2 offspring did not differ in hatching rate and survival (to 28 days) between treatments, but offspring from paired individuals grew faster than those from isolated individuals. On the whole, the self-fertilization depression was extremely low in both populations. Another important result is that paired G 1 individuals began laying (selfed) eggs several weeks prior to initiating copulation : this is the first characterization of prior selfing (selfing initiated prior to any outcrossing) in a hermaphroditic animal. A significant population effect was observed on most traits studied. Our results are discussed with regard to the maintenance of low outcrossing rates in highly inbreeding species.

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Novel environments induce variability in fitness‐related traits

Balph,

Krist

2023

Ecology and Evolution

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Selfing, Outcrossing, and Mixed Mating in the Freshwater Snail Physa heterostropha: Lifetime Fitness and Inbreeding Depression

Cited by 54 publications

References 33 publications

Partial selfing, ecological disturbance and reproductive assurance in an invasive freshwater snail

Partial selfing, ecological disturbance and reproductive assurance in an invasive freshwater snail

Prior selfing and the selfing syndrome in animals: an experimental approach in the freshwater snailBiomphalaria pfeifferi

Novel environments induce variability in fitness‐related traits

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