Different landscape effects on the genetic structure of two broadly distributed woody legumes, <i>Acacia salicina</i> and <i>A. stenophylla</i> (Fabaceae)

Encinas‐Viso, Francisco; McDonald-Spicer, Christiana; Knerr, Nunzio; Thrall, Peter H.; Broadhurst, Linda

doi:10.1002/ece3.6952

Cited by 2 publications

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References 57 publications

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“…However, not all species react in the same way to habitat fragmentation. Encinas-Viso et al (2020) showed that reduced forested area had a significant impact on the genetic differentiation of the Australian legume Acacia salicina but not on A. stenophylla , which inhabits largely the same area. Foré et al (1992) even found decreased genetic differentiation in post-fragmentation populations compared to pre-fragmentation populations in Acer saccharum from the USA.…”

Section: Discussionmentioning

confidence: 96%

Drivers of genetic differentiation and recent evolutionary history of an Eurasian wild pea

Hellwig

Abbo

Ophir

2021

Preprint

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Genetic diversity a major determinant for the capacity of species to persist and adapt to their environments. Unraveling the factors affecting genetic differentiation is crucial to understand how genetic diversity is shaped and species may react to changing environments. We employed genotyping by sequencing to test the influence of climate, space, latitude, altitude and land cover on genetic differentiation in a collection of 81 wild pea samples (Pisum sativum ssp. elatius) from across its distribution range from western Europe to central Asia. We also attempted to elucidate the species recent evolutionary history and its effect on the current distribution of genetic diversity. Association of single SNPs with climate variables were analyses to test for signatures of local adaptation. Genetic variation was geographically structured into six distinct genetic cluster. Two of which were associated with a taxonomic group (Pisum sativum ssp. humile) that according to some researchers does not qualify for a sub-species rank due to its alleged lack of genetic distinctness from other conspecific groups. The effect of the tested factors influencing genetic differentiation were rather variable among genetic clusters. The climate predictors were most important in all clusters. Land use was more important in clusters from areas strongly influenced by human land use, especially by agriculture. We found a statistically significant association of 3,623 SNPs (2.4 % of all SNPs) with one of the environmental predictors. Most of them were correlated with latitude followed by temperature, precipitation and altitude. Estimation of SNP effects of the candidates resulted in a missense to silent ratio of 0.45, suggesting many of the observed candidates SNPs may alter the encoded amino acid sequence. Wild peas went through a genetic bottleneck during the last glacial period followed by population recovery. Probably associated with this population recovery, we detected a range expansion, which may have led to an eastward range expansion of the European cluster to Turkey and thereof southwards and eastwards. Overall, the interplay of several environmental factors and the recent evolutionary history affected the distribution of genetic diversity in wild peas where each subpopulations were differently affected by those factors and processes.

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Section: Discussionmentioning

confidence: 96%

Drivers of genetic differentiation and recent evolutionary history of an Eurasian wild pea

Hellwig

Abbo

Ophir

2021

Preprint

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“…Another meta‐study demonstrated that regardless of the ecological or life‐history traits of the investigated species, fragmentation is likely to negatively impact plant sexual reproduction (Aguilar et al, 2006), however, not all species react in the same manner. Encinas‐Viso et al (2020) showed that reduced forested area had a significant impact on the genetic differentiation of the Australian legume Acacia salicina but not on Acacia stenophylla , which inhabits largely the same area. Foré et al (2011) even found decreased genetic differentiation in post‐fragmentation populations compared to pre‐fragmentation populations in Acer saccharum from the USA.…”

Section: Discussionmentioning

confidence: 99%

Drivers of genetic differentiation and recent evolutionary history of an Eurasian wild pea

Hellwig

Abbo

Ophir

2021

Journal of Biogeography

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Aim Genetic diversity is a major determinant for the capacity of species to persist and adapt to their environments. Unravelling the factors affecting genetic differentiation is crucial to understand how genetic diversity is shaped and species may react to changing environments. We investigated the drivers of genetic differentiation and their interplay with the evolutionary history in a wild pea to test how those may have affected the distribution of genetic diversity. Location Mediterranean basin, western Asia. Taxon Pisum sativum (Fabaceae). Methods We employed restriction site associated DNA (RAD) sequencing of a collection of 81 wild pea samples. The influence of environmental factors on genetic differentiation was tested by estimating the association of these factors and genetic variation using gradient forest analysis. Stairwayplots were used to estimate past effective population sizes and clines of allele frequencies were analysed to detect past expansion patterns. Association of single nucleotide polymorphisms with environmental variables was tested to find signatures of local adaptation. Results The effect of the tested factors influencing genetic differentiation was variable among genetic clusters. Climate predictors were most important in all clusters. Land cover was more important in clusters from areas strongly influenced by human land use. We found statistically significant associations of 3623 SNPs with environmental variables. Most of these SNPs were correlated with latitude followed by temperature. Wild peas went through a genetic bottleneck during the last glacial period followed by population recovery. The detected range expansion patterns suggested an eastward range expansion of the European cluster to Turkey and thereof southwards and eastwards. Main conclusion Drivers of genetic differentiation do not act in a uniform manner within a species. The distribution of genetic variation and the processes affecting this distribution have to be viewed in the context of the hierarchical structure of genetic variation and the environment of its entities to understand how genetic diversity was shaped and may change in the future.

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Different landscape effects on the genetic structure of two broadly distributed woody legumes, Acacia salicina and A. stenophylla (Fabaceae)

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 2 publications

References 57 publications

Drivers of genetic differentiation and recent evolutionary history of an Eurasian wild pea

Drivers of genetic differentiation and recent evolutionary history of an Eurasian wild pea

Drivers of genetic differentiation and recent evolutionary history of an Eurasian wild pea

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