Impact of clonal growth on effective population size in Hymenoxys herbacea (Asteraceae)

Campbell, Lesley G.; Husband, Brian C.

doi:10.1038/sj.hdy.6800653

Cited by 12 publications

(15 citation statements)

References 39 publications

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“…For example, in the long-term, clonal reproduction may reduce the number of genetically distinct individuals within a population and hence decrease the effective population size (e.g. [3,4]). It may also lead to a spatial genetic autocorrelation, which could be falsely attributed to limited propagule dispersal or kin-structured colonization (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fine-scale temporal and spatial variation of taxon and clonal structure in the Daphnia longispina hybrid complex in heterogeneous environments

et al. 2012

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BackgroundCyclical parthenogenetic water fleas of the genus Daphnia have become a prominent model organism in ecology and evolution. In the past, analyses of their population structure have been limited by the prevailing use of allozyme markers, which in general do not allow for the distinction of individual clones. In this study, we used 10 microsatellite markers to track changes in the taxonomic and clonal composition of Daphnia populations, and traced the abundance of the most common clones in two European reservoirs. One of the localities was inhabited by a single species of the Daphnia longispina complex (D. galeata), the other by two parental species (D. galeata and D. longispina) and their interspecific hybrids. The study took place during the transition from summer stratification to autumn mixing, representing a period of major environmental change within lake habitats.ResultsIn both reservoirs, we observed temporal (generation-to-generation) and spatial (along the heterogeneous reservoir environment) changes in Daphnia community structure. In the single-species reservoir, the clonal diversity of D. galeata increased with time, as a few dominant clones were replaced by a higher number of less common clones. A loss in selective advantage for the dominant clones may have been due to gradual changes in the environment, or due to selection acting in a negative frequency-dependent manner. In the multispecies reservoir, there were no apparent temporal trends in clonal diversity but we observed significantly lower clonal diversity in the interspecific hybrids than in the coexisting parental species, supporting the existence of reproductive barriers between the parental genomes.ConclusionsOur study, tracing clonal lineages of Daphnia in time and space by the fine-resolution markers, contributes to the understanding of how clonal reproduction impacts community structure in cyclically parthenogenetic organisms.

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Section: Introductionmentioning

confidence: 99%

Fine-scale temporal and spatial variation of taxon and clonal structure in the Daphnia longispina hybrid complex in heterogeneous environments

et al. 2012

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“…A multitude of life‐history traits may influence genetic variation and N e of plant populations. For instance, asexual reproduction may diminish random genetic drift by increasing the probability of preserving alleles in a population (Campbell and Husband, 2005), whereas nonrandom mating decreases N e because of shorter coalescence times to most recent common ancestor (Nordborg and Donnelly, 1997; Charlesworth, 2009). Seed banks should have profound consequences for the effect of genetic drift and, thus, patterns of genetic structuring (Templeton and Levin, 1979; Vitalis et al, 2004).…”

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confidence: 99%

Genetic consequences of seed banks in the perennial herb Arabidopsis lyrata subsp. petraea (Brassicaceae)

Falahati‐Anbaran

Lundemo

Ågren

et al. 2011

American J of Botany

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• Premise of the Study: Seed banks may increase the effective population size (Ne) of plants as a result of elevated coalescence times for alleles residing in the populations. This has been empirically demonstrated in populations of the annual Arabidopsis thaliana, whereas comparable data for perennial species are currently lacking. We studied the contribution of seed banks to effective sizes of natural populations of the self‐incompatible, perennial Arabidopsis lyrata subsp. petraea, a close relative of A. thaliana. • Methods: Fourteen populations of A. lyrata collected throughout the Norwegian distribution range were analyzed using microsatellite markers. • Key Results: The genetic composition of seed‐bank and aboveground cohorts was found to be highly similar, with little genetic differentiation between cohorts in most populations. However, the proportion of private alleles was higher in aboveground than in seed‐bank cohorts. The presence of seed banks significantly increased total Ne, but the contribution from seed banks to overall Ne were lower than the contribution from aboveground cohorts in most populations. Estimated historical Ne values, reflecting the effective sizes of populations throughout the history of the species, were considerably higher than estimates of contemporary Ne, reflecting number of reproducing individuals within the past few generations. • Conclusions: The results show that the seed bank contributes to total Ne in the perennial herb A. lyrata. However, the contribution is similar to or lower than that of the above‐ground fraction of the population and markedly weaker than that previously documented in the annual A. thaliana.

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“…A few studies on the effect of stage‐specific vital rates on N e in which elasticity or other forms of perturbation analysis were used have been published (Yonezawa et al 2000; Campbell & Husband 2005). Yonezawa et al (2000) analyzed the effect of vital rates on N e in one population of the perennial plant Fritillaria camtschatcensis .…”

Section: Discussionmentioning

confidence: 99%

“…We calculated the elasticity of N e , N a , and λ to matrix elements a ij and lower‐level vital rates (survival rates [ u j ] and flowering probabilities [ p j ]). Elasticities were estimated numerically by perturbing the matrix elements (or the vital rates) by a small quantity that was proportional to their values (0.01%) (Heppell et al 2000; Campbell & Husband 2005): where y is one of N e , N a , or λ; x is a matrix element or a vital rate; y + and y − are the values of y when x is respectively increased or decreased by 0.01%.…”

Section: Methodsmentioning

confidence: 99%

Effect of Stage‐Specific Vital Rates on Population Growth Rates and Effective Population Sizes in an Endangered Iteroparous Plant

Andrello¹,

Nicolè²,

Till–Bottraud³

et al. 2012

Conservation Biology

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Effective population size (N(e)) determines the strength of genetic drift and can influence the level of genetic diversity a population can maintain. Assessing how changes in demographic rates associated with environmental variables and management actions affect N(e) thus can be crucial to the conservation of endangered species. Calculation of N(e) through demographic models makes it possible to use elasticity analyses to study this issue. The elasticity of N(e) to a given vital rate is the proportional change in N(e) associated with a proportional increase in that vital rate. In addition, demographic models can be used to study N(e) and population growth rate (λ) simultaneously. Simultaneous examination is important because some vital rates differ diametrically in their associations with λ and N(e). For example, in some cases increasing these vital rates increases λ and decreases N(e). We used elasticity analysis to study the effect of stage-specific survival and flowering rates on N(e), annual effective population size (N(a)), and λ in seven populations of the endangered plant Austrian dragonhead (Dracocephalum austriacum). In populations with λ ≥ 1, the elasticities of N(e) and N(a) were similar to those of λ. Survival rates of adults were associated with greater elasticities than survival rates of juveniles, flowering rates, or fecundity. In populations with λ < 1, N(e) and N(a) exhibited greater elasticities to juvenile than to adult vital rates. These patterns are similar to those observed in other species with similar life histories. We did not observe contrasting effects of any vital rate on λ and N(e); thus, management actions that increase the λ of populations of Austrian dragonhead will not increase genetic drift. Our results show that elasticity analyses of N(e) and N(a) can complement elasticity analysis of λ. Moreover, such analyses do not require more data than standard matrix models of population dynamics.

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Impact of clonal growth on effective population size in Hymenoxys herbacea (Asteraceae)

Cited by 12 publications

References 39 publications

Fine-scale temporal and spatial variation of taxon and clonal structure in the Daphnia longispina hybrid complex in heterogeneous environments

Fine-scale temporal and spatial variation of taxon and clonal structure in the Daphnia longispina hybrid complex in heterogeneous environments

Genetic consequences of seed banks in the perennial herb Arabidopsis lyrata subsp. petraea (Brassicaceae)

Effect of Stage‐Specific Vital Rates on Population Growth Rates and Effective Population Sizes in an Endangered Iteroparous Plant

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