A Spatial and Temporal Approach to Microevolutionary Forces Affecting Population Biology in the Freshwater Snail<i>Biomphalaria pfeifferi</i>

Charbonnel, Nathalie; Quesnoit, M.; Razatavonjizay, R.; Brémond, Philippe; Jarne, Philippe

doi:10.1086/343875

Cited by 31 publications

(11 citation statements)

References 59 publications

(55 reference statements)

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“…Mate availability was expected to differ with habitat. Episodes of low density should be less frequent in permanent than in temporary habitats, because population bottlenecks associated with drying-out events are expected to be more frequent in temporary habitats (Charbonnel et al, 2002;Trouvé et al, 2003;Bousset et al, 2004). They should also be more frequent in closed than in open habitats, because immigration more easily refills populations after a population bottleneck in open than in closed habitats (Bousset et al, 2004).…”

Section: Tests Of the Rahmentioning

confidence: 99%

“…Its role was suggested in freshwater snails because these organisms often inhabit unpredictable temporary habitats (eg Jarne and Charlesworth, 1993;Städler and Jarne, 1997;Charbonnel et al, 2002). Tsitrone et al (2003a) clarified the conditions under which RA is likely to play a role in mainly outcrossing animal species (see Introduction).…”

Section: Tests Of the Rahmentioning

confidence: 99%

“…Second, P. acuta is the commonest species in isolated habitats (ie ponds) of the area studied here (reviewed in Henry, 2002), in accordance with its invasive status (Dillon et al, 2002;Bousset and Jarne, unpublished data). As colonization has been shown to be associated with founding events in freshwater snails (Charbonnel et al, 2002;Meunier et al, 2004), this opens opportunities for selfing as a RA strategy. In this context, Tsitrone et al (2003a) have shown theoretically that a key-factor, if RA is to play a role in the evolution of selfing, is the waiting time -the time that an isolated individual should wait before selfing when compared to an outcrossing individual.…”

Section: Introductionmentioning

confidence: 98%

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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: Tests Of the Rahmentioning

confidence: 99%

Section: Tests Of the Rahmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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

et al. 2005

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“…Freshwater snails of the Basommatophoran group offer excellent biological models to address these issues (Städler and Jarne, 1997;Charbonnel et al, 2002c;Chapuis et al, 2007;Escobar et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Selfing species are less variable and more strongly structured than the outcrossing ones (Jarne, 1995;Escobar et al, 2011). Several studies using neutral genetic markers have also concluded that the population genetic structure at short spatial scale is affected by habitat characteristics (hydrological permanence or habitat openness; for example, Charbonnel et al, 2002c;Trouvé et al, 2003;Bousset et al, 2004). For example, less variation is maintained in closed (for example, ponds) than in open (for example, rivers) habitats (Bousset et al, 2004;Escobar et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Contrasting the distribution of phenotypic and molecular variation in the freshwater snail Biomphalaria pfeifferi, the intermediate host of Schistosoma mansoni

et al. 2013

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Population differentiation was investigated by confronting phenotypic and molecular variation in the highly selfing freshwater snail Biomphalaria pfeifferi, the intermediate host of Schistosoma mansoni. We sampled seven natural populations separated by a few kilometers, and characterized by different habitat regimes (permanent/temporary) and openness (open/closed). A genetic analysis based on five microsatellite markers confirms that B. pfeifferi is a selfer (sE0.9) and exhibits limited variation within populations. Most pairwise F ST were significant indicating marked population structure, though no isolation by distance was detected. Families from the seven populations were monitored under laboratory conditions over two generations (G 1 and G 2 ), allowing to record several life-history traits, including growth, fecundity and survival, over 25 weeks. Marked differences were detected among populations for traits expressed early in the life cycle (up to sexual maturity). Age and size at first reproduction had high heritability values, but such a trend was not found for early reproductive traits. In most populations, G 1 snails matured later and at a larger size than G 2 individuals. Individuals from permanent habitats matured at a smaller size and were more fecund than those from temporary habitats. The mean phenotypic differentiation over all populations (Q ST ) was lower than the mean genetic differentiation (F ST ), suggesting stabilizing selection. However, no difference was detected between Q ST and F ST for both habitat regime and habitat openness.

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Surprisingly little population genetic structure in a fungus‐associated beetle despite its exploitation of multiple hosts

Wood

Donald

Formica

et al. 2013

Ecology and Evolution

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In heterogeneous environments, landscape features directly affect the structure of genetic variation among populations by functioning as barriers to gene flow. Resource-associated population genetic structure, in which populations that use different resources (e.g., host plants) are genetically distinct, is a well-studied example of how environmental heterogeneity structures populations. However, the pattern that emerges in a given landscape should depend on its particular combination of resources. If resources constitute barriers to gene flow, population differentiation should be lowest in homogeneous landscapes, and highest where resources exist in equal proportions. In this study, we tested whether host community diversity affects population genetic structure in a beetle (Bolitotherus cornutus) that exploits three sympatric host fungi. We collected B. cornutus from plots containing the three host fungi in different proportions and quantified population genetic structure in each plot using a panel of microsatellite loci. We found no relationship between host community diversity and population differentiation in this species; however, we also found no evidence of resource-associated differentiation, suggesting that host fungi are not substantial barriers to gene flow. Moreover, we detected no genetic differentiation among B. cornutus populations separated by several kilometers, even though a previous study demonstrated moderate genetic structure on the scale of a few hundred meters. Although we found no effect of community diversity on population genetic structure in this study, the role of host communities in the structuring of genetic variation in heterogeneous landscapes should be further explored in a species that exhibits resource-associated population genetic structure.

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A Spatial and Temporal Approach to Microevolutionary Forces Affecting Population Biology in the Freshwater SnailBiomphalaria pfeifferi

Cited by 31 publications

References 59 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

Contrasting the distribution of phenotypic and molecular variation in the freshwater snail Biomphalaria pfeifferi, the intermediate host of Schistosoma mansoni

Surprisingly little population genetic structure in a fungus‐associated beetle despite its exploitation of multiple hosts

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