Clonal Diversity in Alpine Populations of Polygonum viviparum (Polygonaceae)

Diggle, Pamela K.; Lower, Steven S.; Ranker, Tom A.

doi:10.1086/297579

Cited by 67 publications

(61 citation statements)

References 64 publications

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“…Surprisingly, genetic diversity of alpine plant populations is not as depleted as predicted from small population sizes and repeated vegetative multiplication, a fact that suggests that gene flow and repeated seedling recruitment during succession might be more frequent than commonly thought (Diggle et al 1998;Pluess and Stöcklin 2004;Reisch et al 2007). …”

Section: Intraspecific Variationmentioning

confidence: 82%

Life-History Responses to the Altitudinal Gradient

Laiolo

Obeso

2017

Advances in Global Change Research

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We review life-history variation along elevation in animals and plants and illustrate its drivers, mechanisms and constraints. Elevation shapes life histories into suites of correlated traits that are often remarkably convergent among organisms facing the same environmental challenges. Much of the variation observed along elevation is the result of direct physiological sensitivity to temperature and nutrient supply. As a general rule, alpine populations adopt 'slow' life cycles, involving long lifespan, delayed maturity, slow reproductive rates and strong inversions in parental care to enhance the chance of recruitment. Exceptions in both animals and plants are often rooted in evolutionary legacies (e.g. constraints to prolonging cycles in obligatory univoltine taxa) or biogeographic history (e.g. location near trailing or leading edges). Predicting evolutionary trajectories into the future must take into account genetic variability, gene flow and selection strength, which define the potential for local adaptation, as well as the rate of anthropogenic environmental change and species' idiosyncratic reaction norms. Shifts up and down elevation in the past helped maintain genetic differentiation in alpine populations, with slow life cycles contributing to the accumulation of genetic diversity during upward migrations. Gene flow is facilitated by the proximity of neighbouring populations, and global warming is likely to move fast genotypes upwards and reduce some of those constraints dominating alpine life. Demographic buffering or compensation may protect local alpine populations against trends in environmental conditions, but such mechanisms may not last indefinitely if evolutionary trajectories cannot keep pace with rapid changes.

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Section: Intraspecific Variationmentioning

confidence: 82%

Life-History Responses to the Altitudinal Gradient

Laiolo

Obeso

2017

Advances in Global Change Research

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“…Carex uvula in the Alps has a value of 7.7, and apparently shows little recruitment via sexual progeny (Steinger et al, 1996). There is significant genetic variability in this and other species of alpine and arctic Carex as well as other species that are either primarily (Steinger et al, 1996;Escaravage et al, 1998) or entirely (Diggle et al, 1998) dependent upon establishment by asexual propagules. This variability may be maintained either by random events such as recurrent mutation and drift or by selection generated by the heterogeneous environments encountered in these settings.…”

Section: Discussionmentioning

confidence: 93%

“…This variability may be maintained either by random events such as recurrent mutation and drift or by selection generated by the heterogeneous environments encountered in these settings. The association between specific environments and specific genotypes and allele frequencies in Carex scopulorum and frequencies of specific clones in the asexual Polygonum viviparum (Diggle et al, 1998) are strongly suggestive in this regard.…”

Section: Discussionmentioning

confidence: 93%

Genetic Variability and Its Ecological Implications in the Clonal Plant Carex scopulorum Holm. in Colorado Tundra

Linhart

Gehring

2003

Arctic, Antarctic, and Alpine Research

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“…Ramets sharing the same multilocus genotype were assumed to be clones from the same individual because patterns of isozyme electrophoresis generally reflect the overall level of variation within a whole genome (Hamlick 1989;Diggle et al 1998). To verify this assumption, we calculated the probability that two sampled ramets belonging to different genets would have the same multilocus genotype by chance (P gen; Parks & Werth 1993).…”

Section: Analysis Of Genotypic Variationmentioning

confidence: 99%

Isozyme variation under different modes of reproduction in two clonal winter annuals, Sedum rosulato‐bulbosum and Sedum bulbiferum (Crassulaceae)

Tsujimura

Ishida

2008

Plant Species Biology

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We studied isozyme variation in two annual species that produce bulbils, Sedum rosulatobulbosum, which includes both sexually reproducing plants and obligate clonal plants that result from triploidy (fertile and sterile S. rosulato-bulbosum, respectively), and an obligate clonal plant, Sedum bulbiferum, to examine the relationship between reproductive mode and isozyme variation. The sterile S. rosulato-bulbosum population exhibited no genotypic variation, but showed high genetic variation (gene diversity, He = 0.60) because five of the six loci that we analyzed were heterozygous. Almost all ramets of S. bulbiferum across 20 populations shared an identical isozyme phenotype, although we could not identify the genetic basis of the phenotype. In contrast, fertile S. rosulato-bulbosum exhibited genotypic variation across the species, but comprised genotypically uniform and polymorphic populations whose genotypic variations correlated positively with the genetic variations within the populations (He at the genet level per population ranged from 0.08 to 0.37). Genetic drift and habitat conditions inhibiting seedling recruitment may have caused this among-population variation. The results for sterile and fertile S. rosulatobulbosum suggest that exclusive clonal reproduction causes low genotypic variation, but maintains genetic variation within individuals. Factors that affect the maintenance of genetic variation in these plants are discussed on the basis of these findings.

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Clonal Diversity in Alpine Populations of Polygonum viviparum (Polygonaceae)

Cited by 67 publications

References 64 publications

Life-History Responses to the Altitudinal Gradient

Life-History Responses to the Altitudinal Gradient

Genetic Variability and Its Ecological Implications in the Clonal Plant Carex scopulorum Holm. in Colorado Tundra

Isozyme variation under different modes of reproduction in two clonal winter annuals, Sedum rosulato‐bulbosum and Sedum bulbiferum (Crassulaceae)

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