The influence of self‐fertilization and grouping on fitness attributes in the freshwater snail Physa acuta: population and individual inbreeding depression

By Jarne, Perdieu, Pernot, Delay, Dávid. 2000

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Populations of the European freshwater pulmonate Physa acuta are not reproductively isolated from American Physa heterostropha or Physa integra (2005, methodology): “from prezygotic factors; a reduction in the fecundity of self-fertilizing individuals of Physa is well documented (Wethington & Dillon 1997; Jarne et al. 2000).”
Inbreeding depression and family variation in a social insect, Bombus terrestris (Hymenoptera: Apidae) (2005, background): “Although spring queens of many family lines will be present at the start of the season, reproduction appears to be dominated by a few, very successful colonies that produce most, or all of the sexuals, especially as far as females (the daughter queens) are concerned (Donovan and Weir 1978, Mu¨ller a”
How did this snail get here? Several dispersal vectors inferred for an aquatic invasive species (2013, background): “Self-fertilisation is frequently found in Physa and pulmonates in general (Dillon & Wethington, 1995; Jarne et al., 2000).”