Signature of mid‐Pleistocene lineages in the European silver fir (<i>Abies alba</i>Mill.) at its geographic distribution margin

Scotti‐Saintagne, Caroline; Boivin, Thomas; Suez, Marie; Musch, Brigitte; Fady, Bruno

doi:10.1002/ece3.7886

Cited by 10 publications

(10 citation statements)

References 109 publications

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“…We sampled stands with strongly different demographic patterns: (i) likely to have been stable on the long term for A. alba , as these stands belong to a biogeographical sector with long‐standing presence of the species (Scotti‐Saintagne et al, 2021); (ii) recently introduced from a genetically diverse seed source and potentially having adapted to new conditions over few generations for C. atlantica (Lefèvre et al, 2004); and (iii) belonging to pioneer species, and therefore having probably undergone repeated colonization events ( P. halepensis : Ruiz Daniels et al, 2019, Olsson et al, 2021, Vendramin et al, 2021; P. pinaster : Bucci et al, 2007). To take these diverse stories into account in our analyses, we estimated historical demographic transitions and used them in population models to control for their effects on genetic diversity patterns as explained below.…”

Section: Methodsmentioning

confidence: 99%

Common microgeographical selection patterns revealed in four European conifers

et al. 2022

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Microgeographical adaptation occurs when the effects of directional selection persist despite gene flow. Traits and genetic loci under selection can then show adaptive divergence, against the backdrop of little differentiation at other traits or loci. How common such events are and how strong the selection is that underlies them remain open questions. Here, we discovered and analysed microgeographical patterns of genomic divergence in four European and Mediterranean conifers with widely differing life-history traits and ecological requirements (Abies alba MIll., Cedrus atlantica [Endl.] Manetti, Pinus halepensis Mill. and Pinus pinaster Aiton) by screening pairs from geographically close forest stands sampled along steep ecological gradients. We inferred patterns of genomic divergence by applying a combination of divergence outlier detection methods, demographic modelling, Approximate Bayesian Computationinferences and genomic annotation to genomic data. Surprisingly for such small geographical scales, we showed that selection is strong in all species but generally affects different loci in each. A clear signature of selection was systematically detected on a fraction of the genome, of the order of 0.1%-1% of the loci depending on the species. The novel modelling method we designed for estimating selection coefficients showed that the microgeographical selection coefficient scaled by population size (Ns) was 2-30. Our results convincingly suggest that selection maintains withinpopulation diversity at microgeographical scales in spatially heterogeneous environments. Such genetic diversity is likely to be a major reservoir of adaptive potential, helping populations to adapt under fluctuating environmental conditions.

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Section: Methodsmentioning

confidence: 99%

Common microgeographical selection patterns revealed in four European conifers

et al. 2022

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“…Also, the Pyrenees lineages of Abies alba Mill. diverged from its ancestral Alpine lineages during the EMPT (Scotti-Saintagne et al ., 2021). In the Apennine Peninsula, mesophilous tree species such as Juglans responded with a range reduction for EMPT (Orain et al ., 2015).…”

Section: Discussionmentioning

confidence: 99%

Evolutionary history ofCastanea sativaMill. in the Caucasus driven by Middle and Late Pleistocene paleoenvironmental changes

Beridze

Sękiewicz

Walas

et al. 2023

Preprint

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Due to global climate cooling and aridification since the Paleogene, the members of the Neogene flora were extirpated from the Northern Hemisphere or were confined to a few refugial areas. For some species, the final reduction/extinction came in the Pleistocene, but some others have survived climatic transformations up to the present. This has occurred in Castanea sativa, a species of high commercial value in Europe and a significant component of the Caucasian forest biodiversity. In contrast to the European range, neither the historical biogeography nor the population genetic structure of the species in the isolated Caucasian range has been clarified. Here, based on a survey of 21 natural populations from the Caucasus and a single one from Europe, we provide likely biogeographic reconstruction and genetic diversity details. By applying Bayesian inference, species distribution modelling, and fossil pollen data, we estimated (1) the time of the Caucasian - European divergence during the Middle Pleistocene (436.5 ka), (2) the time of divergence among Caucasian lineages, and (3) outlined the glacial refugia for species. The climate changes related to the Early Middle Pleistocene Transition and the alpine orogenic uplift in the region are proposed as the major drivers of the intraspecific divergence and European-Caucasian disjunction, while the impact of the last glacial cycle was of marginal importance.

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“…The low genetic diversity of these populations are most probably the results of genetic drift due to founder effects, long term isolation or population size reduction due to recurring unfavourable environmental conditions (Excoffier et al, 2009 ). In particular, silver fir populations from the Pyrenees have long been isolated from the rest of the range as suggested by the presence of macroremains older than 15 kyr BP (Terhürne‐Berson et al, 2004 ) and recent genetic study (Scotti‐Saintagne et al, 2021 ). PYR is also the farthest site from the largest effective refugia of the multiple glacial cycles situated in the Apennines.…”

Section: Discussionmentioning

confidence: 99%

“…Genetic diversity was the lowest in the westernmost (Pyrenees, PYR) and the easternmost (Carpathians, FAG) extremes of the distribution range (Figure 1 and Table 1). The low genetic diversity of these populations are most probably the results of genetic drift due to founder effects, long term isolation or population size reduction due to recurring unfavourable environmental conditions (Excoffier Berson et al, 2004) and recent genetic study (Scotti-Saintagne et al, 2021). PYR is also the farthest site from the largest effective refugia of the multiple glacial cycles situated in the Apennines.…”

Section: Genetic Diversity Of Silver Fir Populations Across the Speci...mentioning

confidence: 99%

Fine‐scale spatial genetic structure across the species range reflects recent colonization of high elevation habitats in silver fir (Abies albaMill.)

Major¹,

Höhn²,

Avanzi

et al. 2021

Molecular Ecology

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Signature of mid‐Pleistocene lineages in the European silver fir (Abies albaMill.) at its geographic distribution margin

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 10 publications

References 109 publications

Common microgeographical selection patterns revealed in four European conifers

Common microgeographical selection patterns revealed in four European conifers

Evolutionary history ofCastanea sativaMill. in the Caucasus driven by Middle and Late Pleistocene paleoenvironmental changes

Fine‐scale spatial genetic structure across the species range reflects recent colonization of high elevation habitats in silver fir (Abies albaMill.)

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