Founder effects and geographical variation in the invading cladoceran Bosmina (Eubosmima) coregoni Baird 1857 in North America

Demelo, Rita; Hebert, Paul D. N.

doi:10.1038/hdy.1994.147

Cited by 41 publications

(20 citation statements)

References 39 publications

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“…This result is in agreement with population genetic theory, which predicts that newly established populations will exhibit founder effects, including loss of genetic variation and/or alteration of genetic structure from passing trough a bottleneck, if the founding population is small (Boileau et al 1992;DeMelo & Hebert 1994). The same homogeneity was found for D. obtusa by Bachiorri et al (1991): all the 1341 D. obtusa specimens analyzed between 1987 and 1989 resulted monomorphic for 15 loci.…”

Section: Discussionsupporting

confidence: 88%

On the presence of Daphnia galeata in Lake Orta (N. Italy)

Piscia

Seďa²,

Bonacina³

et al. 2006

J Limnol

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Section: Discussionsupporting

confidence: 88%

On the presence of Daphnia galeata in Lake Orta (N. Italy)

Piscia

Seďa²,

Bonacina³

et al. 2006

J Limnol

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“…We have to take into consideration that the pollen exchange considerably increases gene flow, which reduces F st and limits the effects of successive founder events, allowing the maintenance of a high level of genetic diversity. Demelo and Hebert (1994) give numerical values for the intra-deme diversity and F st in a species of the freshwater invertebrate Bosmina coregoni. Their results show rather high F st values (0.18 to 0.36) but not a great loss of diversity within the populations.…”

Section: Detecting a Colonization Process In Natural Populationsmentioning

confidence: 99%

“…As pointed out by Kremer (1994), there have been only a hundred or so generations since the beginning of the recolonization by forest trees of Europe and North America, about 18,000 years ago. Some species have also been introduced into new habitats, often consecutively to human migrations, and have from there colonized new places (Demelo and Hebert, 1994;Johnson, 1988). They have suffered several founder events.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Coalescence Times, Genetic Diversity and Structure during Colonization

Austerlitz

Jung-Muller²,

Godelle³

et al. 1997

Theoretical Population Biology

282

302

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We consider the impact of a colonization process on the genetic diversity and spatial structure of a geographically subdivided population. A stepping-stone model combined with coalescence theory is used to predict the evolution of sequence divergence and genetic parameters. We first derive analytical results for coalescence times in a population undergoing logistic growth. We next consider a stepping-stone model in which demes are successively colonized, starting from a first deme at one of the borders of the metapopulation. We use recurrence equations to calculate coalescence times for two genes chosen either inside the same deme or in different demes. This allows us to obtain the distribution and the expectation of the coalescence times, and to deduce from them the distribution of the average pairwise differences and the evolution of F st . Our results reflect the impact of the founder effect, which becomes stronger as the distance of the deme from the first deme increases. An increase in migration rate or growth rate generally leads to a decrease of the founder effect. F st (i) increases during the beginning of the colonization, (ii) decreases when migration creates homogenization and (iii) increases again towards an equilibrium value. The distributions of pairwise coalescence times or differences between sequences show a peak corresponding to the colonization period. These results could help detect former colonization events in natural populations.] 1997 Academic Press

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“…These ecological changes can have a direct impact on the evolutionary dynamics of populations, especially by influencing the relative importance of natural selection and stochastic processes (Mayr 1963;Templeton 1980;Carson and Templeton 1984;Stebbins 1989;Barton 1989). Empirical evidence for the evolutionary significance of stochastic processes during colonization, however, remains limited, in part because most studies on the genetic consequences of colonization have focused on genes of little selective importance, primarily allozyme loci (Brown and Marshall 1981;Berlocher 1984;Baker and Moeed 1987;Barrett and Shore 1990;Demelo and Hebert 1994). Attempts to examine the stochastic effects of colonization on adaptive traits often encounter problems teasing apart genetic changes resulting from altered selection pressures from those arising from founder effect and genetic drift 4 Corresponding author.…”

mentioning

confidence: 99%

GENETIC DRIFT AND FOUNDER EFFECT IN NATIVE VERSUS INTRODUCED POPULATIONS OF AN INVADING PLANT,LYTHRUM SALICARIA(LYTHRACEAE)

1996

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Abstract.-There are few convincing examples of genetic drift at loci under selection in natural populations. The plant sexual polymorphism tristyly provides an opportunity to investigate genetic drift because stochastic processes interacting with frequency-dependent selection give rise to a diagnostic pattern of morph-frequency variation. A previous study of 102 Ontario populations of the introduced tristylous wetland herb Lythrum salicaria provided evidence for the role of stochastic processes during colonization. However, whether stochastic effects are greater in these recently introduced populations compared to native Eurasian populations remains unclear. The propensity of this species to invade disturbed habitats suggests that episodes of colonization and periods of small population size must also occur in the native range. A survey of 102 populations in southwestern France indicated reduced stochastic effects in native populations. Populations exhibited significantly lower morph loss than in Ontario (5% vs. 23%) and significantly higher values of morph evenness. The greater incidence of trimorphism in French populations was not associated with larger population sizes; populations were significantly smaller than those in Ontario (means: 266 vs. 487). Morph evenness was positively correlated with population size among French but not Ontario populations, providing further evidence of nonequilibrium conditions in introduced compared to native populations. The incidence of trimorphism was unexpectedly high in small native populations (N:S 25; 22 of 27 populations trimorphic). Computer simulations indicated that levels of gene flow on the order of m 2: 0.05 can account for the maintenance of tristyly in small populations. The high connectivity of populations within the agricultural landscape typical of southwestern France may facilitate levels of gene flow sufficient to maintain trimorphism in small populations.

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Founder effects and geographical variation in the invading cladoceran Bosmina (Eubosmima) coregoni Baird 1857 in North America

Cited by 41 publications

References 39 publications

On the presence of Daphnia galeata in Lake Orta (N. Italy)

On the presence of Daphnia galeata in Lake Orta (N. Italy)

Evolution of Coalescence Times, Genetic Diversity and Structure during Colonization

GENETIC DRIFT AND FOUNDER EFFECT IN NATIVE VERSUS INTRODUCED POPULATIONS OF AN INVADING PLANT,LYTHRUM SALICARIA(LYTHRACEAE)

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