Genetic structure of the endemic Papaver occidentale indicates survival and immigration in the Western Prealps

Pittet, Loïc; Fragnière, Yann; Grünig, Sandra; Bétrisey, Sébastien; Clément, Benoît; Gerber, Emanuel; Ronikier, Michał; Kozlowski, Gregor; Parisod, Christian (2020). Genetic structure of the endemic Papaver occidentale indicates survival and immigration in the Western Prealps. Alpine Botany, 130(2), pp. 129-140. Springer 10.1007/s00035-020-00238-3

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Climatic oscillations of the Quaternary rapidly compelled plant species to shift their geographical range. How alpine plant species responded to climate change, however, remains elusive and remnants of the cold-adapted flora that currently strive in restricted ranges as small, isolated populations have been particularly overlooked. To address the evolutionary history of such a ‘glacial relict’, we here sampled and genotyped all known native populations of a narrow endemic species from the northwestern Alps, Papaver occidentale, as well as closely related taxa with double digest restriction-site Associated DNA (ddRAD) sequencing. Spatial patterns of genetic variation across populations coupled with insights from climatic niche modelling through time address underpinings of the long-term persistence of the species in face of climate changes. Evidence from population genetics and ecological modelling indicates that P. occidentale likely persisted through the last glacial maximum outside of the Western Prealps and that a major lineage recolonized the area from lower elevation, external regions. Differentiated lineages at the Northern margins of the species distribution range highlight highly divergent and geographically restricted populations that include considerable share of private markers and may indicate local glacial survival in isolated conditions. Our data thus imply that processes having shaped intraspecific spatial genetic structure within the Alps can be complex and lead to mosaic of populations with a mixed-history of local survival and immigration. A better understanding of spatio-temporal aspects of range contraction–expansion is crucial to shed light on processes underlying the evolution of remnant populations of such endemic species and set conservation priorities considering current climate changes.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Ecological Genomics

UniBE Contributor:

Grünig, Sandra and Parisod, Christian Gérard

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1664-2201

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

14 Aug 2020 15:48

Last Modified:

28 Oct 2020 11:59

Publisher DOI:

10.1007/s00035-020-00238-3

Uncontrolled Keywords:

arctic-alpine fora; conservation biology; ddRAD sequencing; narrow endemic species; Papaver alpinum species complex; refugia during last glacial maximum

BORIS DOI:

10.7892/boris.145791

URI:

https://boris.unibe.ch/id/eprint/145791

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