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45 results for “Impatiens capensis”
Data from: Drift happens: molecular genetic diversity and differentiation among populations of jewelweed (Impatiens capensis Meerb.) reflect fragmentation of floodplain forests
Landscape features often shape patterns of gene flow and genetic differentiation in plant species. Populations that are small and isolated enough also become subject to genetic drift. We examined patterns of gene flow and differentiation among 12 floodplain populations of the selfing annual jewelweed (Impatiens capensis Meerb.) nested within four river systems and two major watersheds in Wisconsin, USA. Floodplain forests and marshes provide a model system for assessing the effects of habitat fragmentation within agricultural/urban landscapes and for testing whether rivers act to genetically connect dispersed populations. We generated a panel of 12,856 single nucleotide polymorphisms and assessed genetic diversity, differentiation, gene flow, and drift. Clustering methods revealed strong population genetic structure with limited admixture and highly differentiated populations (mean multilocus FST = 0.32, FST' = 0.33). No signals of isolation by geographic distance or environment emerged, but alleles may flow along rivers given that genetic differentiation increased with river distance. Differentiation also increased in populations with fewer private alleles (R2 = 0.51) and higher local inbreeding (R2 = 0.22). Populations varied greatly in levels of local inbreeding (FIS = 0.2 to 0.9) and FIS declined in smaller, more isolated populations. These results suggest that genetic drift dominates other forces in structuring these Impatiens populations. In rapidly changing environments, species must migrate or genetically adapt. Habitat fragmentation limits both processes, potentially compromising the ability of species to persist in fragmented landscapes.
Impatiens capensis (Balsaminaceae) - fruit - lateral or general close-up
Image of Impatiens capensis (Balsaminaceae) - fruit - lateral or general close-up
Impatiens capensis (Balsaminaceae) - seed - general view
Image of Impatiens capensis (Balsaminaceae) - seed - general view
Impatiens capensis (Balsaminaceae) - fruit - section or open
Image of Impatiens capensis (Balsaminaceae) - fruit - section or open
Impatiens capensis (Balsaminaceae) - inflorescence - frontal view of flower
Image of Impatiens capensis (Balsaminaceae) - inflorescence - frontal view of flower
Impatiens capensis (Balsaminaceae) - whole plant - in flower - general view
Image of Impatiens capensis (Balsaminaceae) - whole plant - in flower - general view
Impatiens capensis (Balsaminaceae) - inflorescence - lateral view of flower
Image of Impatiens capensis (Balsaminaceae) - inflorescence - lateral view of flower
Impatiens capensis (Balsaminaceae) - whole plant - juvenile
Image of Impatiens capensis (Balsaminaceae) - whole plant - juvenile
Impatiens capensis (Balsaminaceae) - whole plant - in flower - general view
Image of Impatiens capensis (Balsaminaceae) - whole plant - in flower - general view
Impatiens capensis (Balsaminaceae) - leaf - on upper stem
Image of Impatiens capensis (Balsaminaceae) - leaf - on upper stem
Impatiens capensis (Balsaminaceae) - stem - showing leaf bases
Image of Impatiens capensis (Balsaminaceae) - stem - showing leaf bases
Impatiens capensis (Balsaminaceae) - whole plant - juvenile
Image of Impatiens capensis (Balsaminaceae) - whole plant - juvenile
Impatiens capensis (Balsaminaceae) - inflorescence - frontal view of flower
Image of Impatiens capensis (Balsaminaceae) - inflorescence - frontal view of flower
Impatiens capensis (Balsaminaceae) - inflorescence - lateral view of flower
Image of Impatiens capensis (Balsaminaceae) - inflorescence - lateral view of flower
Impatiens capensis Meerb. (BR0000005396306)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Impatiens capensis (Balsaminaceae) - stem - showing leaf bases
Image of Impatiens capensis (Balsaminaceae) - stem - showing leaf bases
Data and code for: Plastic and quantitative genetic divergence mirror environmental gradients among wild, fragmented populations of Impatiens capensis
<p><strong>Premise of the study:</strong> Habitat fragmentation generates molecular genetic divergence among isolated populations but few studies have assessed phenotypic divergence and fitness in populations where the genetic consequences of habitat fragmentation are known. Phenotypic divergence could reflect plasticity, local adaptation, and/or genetic drift.</p> <p><strong>Methods:</strong> We examined patterns and potential drivers of phenotypic divergence among 12 populations of jewelweed (<em>Impatiens capensis </em>Meerb.) that show strong molecular genetic signals of isolation and drift among fragmented habitats. We measured morphological and reproductive traits in both maternal plants within natural populations and their self-fertilized progeny grown together in a common garden. We also quantified environmental divergence between home sites and the common garden.</p> <p><strong>Key results: </strong>Populations with less molecular genetic variation expressed less maternal phenotypic variation. Progeny in the common garden converged in phenotypes relative to their wild mothers but retained among-population differences in morphology, survival, and reproduction. Among-population phenotypic variance was 3-10x greater in home sites than in the common garden for 6 of 7 morphological traits measured. Patterns of phenotypic divergence paralleled environmental gradients in ways suggestive of adaptation. Progeny resembled their mothers less as the environmental distance between their home site and the common garden increased.</p> <p><strong>Conclusions: </strong>Despite strong molecular signatures of isolation and drift, phenotypic differences among these <em>Impatiens </em>populations appear to reflect both adaptive quantitative genetic divergence and plasticity. Quantifying the extent of local adaptation and plasticity and how these covary with molecular and phenotypic variation help us predict when populations may lose their adaptive capacity. </p>
Data and code for: Failure to purge: Population and individual inbreeding effects on fitness across generations of wild Impatiens capensis
<p>Inbreeding exposes deleterious recessive alleles in homozygotes, lowering fitness and generating inbreeding depression (ID). Both purging (via selection) and fixation (via drift) should reduce segregating deleterious mutations and ID in more inbred populations. These theoretical predictions are not well-tested in wild populations, which is concerning given purging/fixation have opposite fitness outcomes. We examined how individual- and population-level inbreeding and genomic heterozygosity affected maternal and progeny fitness within and among 12 wild populations of <em>Impatiens capensis</em>. We quantified maternal fitness in home sites, maternal multilocus heterozygosity (using 12,560 SNPs), and lifetime fitness of selfed and predominantly outcrossed progeny in a common garden. These populations spanned a broad range of individual- (<span class="s1"><em>f</em></span><span class="s2"><sub>i</sub></span><em> </em>= -0.17–0.98) and population-level inbreeding (<span class="s1"><em>F</em></span><span class="s2"><sub>IS</sub></span> = 0.25–0.87). More inbred populations contained fewer polymorphic loci, less fecund mothers, and smaller progeny, suggesting higher fixed loads. However, despite appreciable ID (mean: 8.8 lethal equivalents per gamete), ID did not systematically decline in more inbred population. More heterozygous mothers were more fecund and produced fitter progeny in outcrossed populations, but this pattern unexpectedly reversed in highly inbred populations. These observations suggest that persistent overdominance or some other force acts to forestall purging and fixation in these populations.</p>
Data and code for: Plastic and quantitative genetic divergence mirror environmental gradients among wild, fragmented populations of Impatiens capensis
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Data and code for: Failure to purge: Population and individual inbreeding effects on fitness across generations of wild Impatiens capensis
Open the record for dataset details and reuse information.
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