A striking example of the founder effect in the mollusc Littorina saxatilis

Knight, Andrew; Hughes, Roger N.; Ward, Robert

doi:10.1111/j.1095-8312.1987.tb00441.x

Cited by 56 publications

(33 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, successive invasions of the Mediterranean fruit fly Ceratitis capitata (Medfly) during the 20th century in California have resulted in a loss of 60% of the ancestral allozyme genetic variation (Villablanca et al 1998). Significant decreases in genetic variability of the source population have been reported in introduced areas, especially in plants (Eckert et al 1996, Am- (Berlocher 1984, Tsutsui et al 2000, birds (Baker & Moeed 1987) and molluscs (Selander & Ochman 1983, Knight et al 1987, Johnson 1988. Interestingly, our data for Crepidula fornicata do not fit theoretical expectations for populations founded from a few individuals or empirical observations made for other exotic species.…”

Section: Discussioncontrasting

confidence: 74%

High genetic diversity and ephemeral drift effects in a successful introduced mollusc (Crepidula fornicata: Gastropoda)

Dupont¹,

Jollivet²,

Viard³

2003

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Human-mediated biological invasions are known to threaten biodiversity and are often the cause of economic problems, mainly via interspecific interactions with commercially valuable indigenous species. The hermaphroditic gastropod Crepidula fornicata (L.) is a successful marine invader of European coasts. In France, it was first recorded in the 1940s and now proliferates, competing with cultured and fished bivalves. To analyze the patterns of spread and the genetic architecture of the populations of this invader, 13 populations, 12 French and 1 native (American) (N = 660) were sexed and analyzed using 8 polymorphic enzyme loci. The majority of the populations showed balanced sex ratios. A high level of genetic diversity was detected in the French populations, contrary to the usual pattern of founder effect frequently reported for invaders. Moreover, most of the introduced populations were shown to be in migration-drift equilibrium. Thus, our results suggest that, in its introduced range, C. fornicata has stable populations and behaves genetically and demographically in the same way that it does over its native range. The pattern among French populations suggests that the introduction process was complex, and that C. fornicata from France derives from several genetically diverse, but poorly differentiated, source populations. Finally, this dataset also showed that the effects of shell-farmer-mediated transport between bays are only detectable at some specific localities. On the other hand, there was a good fit between patterns of genetic differentiation and the major hydrodynamic features along the French coasts, strongly suggesting that larval dispersal plays an important role in the spread of C. fornicata in Europe. KEY WORDS: Biological invasion · Slipper-limpet · Founder effect · Dispersal · Genetic diversity · ProtandryResale or republication not permitted without written consent of the publisher

show abstract

Section: Discussioncontrasting

confidence: 74%

High genetic diversity and ephemeral drift effects in a successful introduced mollusc (Crepidula fornicata: Gastropoda)

Dupont¹,

Jollivet²,

Viard³

2003

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…This relationship may, however, be rather inaccurate in some species (Berger, 1977). The level of population subdivision is also sensitive to historical phenomena, such as bottlenecks, founder events (Berger, 1977;Janson, 1987b;Knight et a!., 1987) and selection (Berger, 1983;Johannesson & Johannesson, 1989). However, other relationships are not easily found in comparative studies because of the difficulty in using closely related species with comparable life history characteristics (Wolf, 1991).…”

Section: Introductionmentioning

confidence: 99%

Distinct genetic subdivision in sympatric and sibling species of the genus Littorina (Gastropoda: Littorinidae)

Rolán‐Alvarez

Álvarez

1995

Heredity

View full text Add to dashboard Cite

The genetic structure of two sibling and sympatric species of the genus Littorina was compared using allozymic loci. The two species are biologically and ecologically well-known and mostly show similar life history characteristics. Three populations of L. mariae Sacchi & Rastelli and L. obtusata (L.) were studied in the Muros-Noya Ria (Galicia, NW Spain). In addition, four microgeographical subsamples taken from one of the populations were analysed for each species. Age, sex and genotypes for nine polymorphic loci were studied in 1250 snails of both species. L. mariae showed larger genetic population subdivision and lower heterozygosity levels for the loci studied than did L. obtusata. Heterozygote deficiencies were found in only a few cases in natural populations of both species, usually affecting the Lap-i locus. No significant genetic differences among age or sex classes were found. These results may be explained by the lower effective population size in L. mciriae than in L. obtusata. Known differences between these species in generation interval and population density during the winter can cause the different effective population sizes suggested. These life history characteristics appear to provide the most likely explanations for the differences in genetic differentiation and heterozygosity between the two species. A previously unknown L. mariae morph from exposed shores is tentatively suggested to be conspecific.

show abstract

“…Berger, 1973;Janson, 1987;Waples, 1987), although some species with apparently a great potential for gene flow have a surprisingly large genetic subdivision (Burton, 1983;Hedgecock, 1986). Littorinid snails have provided some of the clearest examples of the greater localized genetic differentiation and adaptation in species which lack a planktonic phase of development (Berger, 1973;Janson, 1987;Knight et al, 1987;Behrens Yamada, 1989). …”

Section: Introductionmentioning

confidence: 99%

Genetic subdivision of the intertidal snail Bembicium vittatum (Gastropoda: Littorinidae) varies with habitat in the Houtman Abrolhos Islands, Western Australia

Johnson

1991

Heredity

View full text Add to dashboard Cite

The littorine gastropod Bembicium vittatum has benthic egg masses and is thought to have little or no period of planktomc development. A study of allozyme polymorphisms in populations from the Houtman Abroihos Islands, Western Australia, permitted examination of genetic subdivision within and among island groups, and among populations from contrasting habitats which occur throughout the Abroihos archipelago. Across all populations, the average FST for five polymorphic loci was 0.163, which is very large for a marine species but similar to values found for other gastropods that lack planktonic development. The level of genetic subdivision varied dramatically with habitat. Over similar distances, the average FST among lake populations was 0.277, compared with 0.138 among populations from protected lagoonal shores, and only 0.022 among populations from relatively exposed shores. This variation emphasizes the need to consider local conditions when attempting to determine the genetic structure of a species.

show abstract

A striking example of the founder effect in the mollusc Littorina saxatilis

Cited by 56 publications

References 15 publications

High genetic diversity and ephemeral drift effects in a successful introduced mollusc (Crepidula fornicata: Gastropoda)

High genetic diversity and ephemeral drift effects in a successful introduced mollusc (Crepidula fornicata: Gastropoda)

Distinct genetic subdivision in sympatric and sibling species of the genus Littorina (Gastropoda: Littorinidae)

Genetic subdivision of the intertidal snail Bembicium vittatum (Gastropoda: Littorinidae) varies with habitat in the Houtman Abrolhos Islands, Western Australia

Contact Info

Product

Resources

About