Decline in gene diversity and strong genetic drift in the northward-expanding marginal populations of Fagus crenata

Kitamura, Keiko; Matsui, Tetsuya; Makoto, Kobayashi; Saitou, Hitoshi; Namikawa, Kanji; Tsuda, Yoshiaki

doi:10.1007/s11295-015-0857-y

Cited by 16 publications

(36 citation statements)

References 62 publications

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“…On the one hand, the inbreeding coefficient, G IS , also showed the same gradient (Figures 2d and 3). The reason for this tendency has not yet been clarified, but the same tendency has been reported in previous studies of marginal populations of the anemogamous species, Fagus crenata [4]; that is, the smaller the population, the lower the inbreeding coefficient.…”

Section: Discussionsupporting

confidence: 61%

“…In conclusion, the central-marginal hypothesis that marginal populations show less genetic variation and higher differentiation than do central populations [4][5][6] was found to be relevant to natural populations of A. sachalinensis in Hokkaido, with the southwestern populations being highly differentiated from the other populations. In addition, the longitudinal genetic cline revealed by Nagasaka et al [21] was supported by the 19 EST-SSR markers in this study.…”

Section: Discussionmentioning

confidence: 79%

“…The geographic distribution center provides favorable biotic and abiotic environments for species persistence. On the contrary, peripheral populations are exposed to unfavorable environmental conditions and the populations at the range margin are smaller and more isolated from each other than those at the range core [2][3][4]. The central-marginal hypothesis states that marginal populations show lower genetic variation and higher differentiation than do central populations (see review [5,6]).…”

Section: Introductionmentioning

confidence: 99%

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Geographical Gradients of Genetic Diversity and Differentiation among the Southernmost Marginal Populations of Abies sachalinensis Revealed by EST-SSR Polymorphism

Kitamura

Uchiyama

Ueno

et al. 2020

Forests

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Research Highlights: We detected the longitudinal gradients of genetic diversity parameters, such as the number of alleles, effective number of alleles, heterozygosity, and inbreeding coefficient, and found that these might be attributable to climatic conditions, such as temperature and snow depth. Background and Objectives: Genetic diversity among local populations of a plant species at its distributional margin has long been of interest in ecological genetics. Populations at the distribution center grow well in favorable conditions, but those at the range margins are exposed to unfavorable environments, and the environmental conditions at establishment sites might reflect the genetic diversity of local populations. This is known as the central-marginal hypothesis in which marginal populations show lower genetic variation and higher differentiation than in central populations. In addition, genetic variation in a local population is influenced by phylogenetic constraints and the population history of selection under environmental constraints. In this study, we investigated this hypothesis in relation to Abies sachalinensis, a major conifer species in Hokkaido. Materials and Methods: A total of 1189 trees from 25 natural populations were analyzed using 19 EST-SSR loci. Results: The eastern populations, namely, those in the species distribution center, showed greater genetic diversity than did the western peripheral populations. Another important finding is that the southwestern marginal populations were genetically differentiated from the other populations. Conclusions: These differences might be due to genetic drift in the small and isolated populations at the range margin. Therefore, our results indicated that the central-marginal hypothesis held true for the southernmost A. sachalinensis populations in Hokkaido.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Geographical Gradients of Genetic Diversity and Differentiation among the Southernmost Marginal Populations of Abies sachalinensis Revealed by EST-SSR Polymorphism

Kitamura

Uchiyama

Ueno

et al. 2020

Forests

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“…This heterogeneity is represented across studies of tree species. Empirical studies have found both lower genetic diversity (Mimura & Aitken, 2007;Marsico et al, 2009;Kitamura et al, 2015;Johnson et al, 2017) and similar or higher genetic diversity (Born et al, 2008;Pluess, 2011;Shi & Chen, 2012) in leading edge populations of tree species after range expansion. Temperate forest tree species are generally associated with high gene flow via wind-borne pollen across large geographic distances (Kremer et al, 2012), as well as a long life span and juvenile phase.…”

Section: Introductionmentioning

confidence: 99%

Long‐distance pollen dispersal during recent colonization favors a rapid but partial recovery of genetic diversity in Picea sitchensis

Elleouet

Aitken

2019

New Phytologist

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Summary Tree species in the northern hemisphere are currently subject to rapid anthropogenic climate change and are shifting their ranges in response. This prompts questions about the mechanisms allowing tree populations to respond quickly to selection pressures when establishing into new areas. Focusing on the northern expanding range edge of Picea sitchensis, a widespread conifer of western North America, we ask how genetic structure and diversity develop during colonization, and assess the role of demographic history in shaping the evolutionary trajectory of an establishing population. We combined 500 yr of tree‐ring and genotyping‐by‐sequencing data in 639 trees at the expansion front on the Kodiak Archipelago. We show that alleles accumulated rapidly during an increase in recruitment rate in the early 1700s. A shift from foreign to local pollen flow subsequently homogenized genetic structure at the expansion front. Taking advantage of the exceptional longevity of conifers, we highlight the major role of long‐distance pollen dispersal in the rapid but incomplete recovery of genetic diversity during the initial stages of colonization. We also warn that slow initial population growth as well as long‐lasting dominance of local gene flow by early founders could increase evolutionary load under a rapidly changing climate.

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“…This heterogeneity is present across studies of tree species. Empirical studies at the scale of species ranges have found both higher genetic diversity (Born et al, 2008; Pluess, 2011; Shi & Chen, 2012) and lower genetic diversity (Johnson et al, 2017; Kitamura et al, 2015; Marsico et al, 2009; Mimura & Aitken, 2007) in leading edge populations of tree species after range expansion. Temperate forest tree species are generally associated with high gene flow via wind-borne pollen across large geographic distances (Kremer et al, 2012), as well as a long lifespan and juvenile phase.…”

Section: Introductionmentioning

confidence: 99%

The interplay between demography and neutral evolution at the expansion front of a widespread conifer,Picea sitchensis

Elleouet

Aitken

2018

Preprint

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Tree species in the northern hemisphere have advanced and retreated with interglacial and glacial periods, and are currently subject to rapid anthropogenic climate change. These observations prompt questions about the mechanisms allowing tree populations to respond quickly to selection pressures when establishing into new areas. Focusing on the northern expanding range edge of Picea sitchensis, a widespread conifer of western North America, we ask how genetic structure and diversity develop during colonization, and assess the role of demographic history in shaping the evolutionary trajectory of a colonizing population. By combining nearly 500 years of tree-ring and genetic data at the expansion front on the Kodiak Archipelago, we show that allelic richness - but not expected heterozygosity - increased rapidly during early stages of establishment in the 1600s, while genetic differentiation from populations further from the front decreased. This trend ended in the 1700s, after an increase in population growth rate. These findings highlight the major role of long-distance pollen dispersal in the recovery of genetic diversity during initial stages of colonization, and suggest that demographic dynamics including an initial lag in population growth are likely limiting factors in the adaptation of tree populations tracking their niche in a changing climate.

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Decline in gene diversity and strong genetic drift in the northward-expanding marginal populations of Fagus crenata

Cited by 16 publications

References 62 publications

Geographical Gradients of Genetic Diversity and Differentiation among the Southernmost Marginal Populations of Abies sachalinensis Revealed by EST-SSR Polymorphism

Geographical Gradients of Genetic Diversity and Differentiation among the Southernmost Marginal Populations of Abies sachalinensis Revealed by EST-SSR Polymorphism

Long‐distance pollen dispersal during recent colonization favors a rapid but partial recovery of genetic diversity in Picea sitchensis

The interplay between demography and neutral evolution at the expansion front of a widespread conifer,Picea sitchensis

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