Notice
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 17
- document 1 document 2 document 3
- niveau 1 niveau 2 niveau 3
Descriptif
GENTREE Final Conference :
Christian RELLSTAB - WSL Birmensdorf · Switzerland
GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment'
27-31 January 2020, Avignon, France
Christian RELLSTAB - WSL Birmensdorf · Switzerland : Geographic andenvironmental determinants of neutral and adaptive genomic variationin Swiss stone pine
Disentangling the factors that govern the distribution of genetic diversity is crucial to set measures for conserving species genetic diversity.
It is generally accepted that the distribution of neutral genetic diversity of a species mostly depends, among other factors, on effective population size, the degree of population fragmentation (i.e. gene flow), geographic position (i.e. peripherality/centrality) within its native range, and habitat suitability within its ecological niche.
However, it remains unclear to what degree genetic diversity at neutral and adaptive loci correlates with geographic peripherality or habitat suitability.
Using range-wide distribution maps and exome-based genomic data, we first tested whether geographic peripherality explains population genetic diversity at >17,000 neutral and adaptive SNPs in 24 Alpine populations (480 individuals) of Pinus cembra, a keystone species of the timberline ecotone.
To define neutral and adaptive SNP sets, we used various approaches (gene diversity estimates, FST outlier test, and environmental association analysis) that identify signatures of selection. We then established ecological niche models for the study species and investigated the relationship between habitat suitability and genetic diversity at both neutral and adaptive loci.
Our results show that geographic peripherality and habitat suitability were not highly correlated. Various estimates of neutral genetic diversity decreased with geographic peripherality, but were usually not correlated with habitat suitability.
In contrast, genetic diversity (He) declined with increasingly suitable conditions at loci showing a strong signal for positive selection based on Tajima’s D. Our results suggest that populations at the edge of the geographic distribution harbor less neutral genetic diversity due to small population sizes and restricted gene flow. Moreover, we argue that populations from highly suitable habitats already went through strong selection processes, are adapted to local conditions, and therefore exhibit reduced genetic diversity at adaptive loci compared to populations at the niche edge.
Our findings provide new insights into the relationships between adaptive genetic variation, geographic position, and habitat suitability, and on spatial patterns of adaptive genetic variation.
We discuss the importance of disentangling neutral and adaptive genetic variation to better refine a species’ adaptive capacity.
This is highly important for conservation projects in which forest and conservation managers or other stakeholders need reliable estimates of population genetic diversity for drawing recommendations in the context of environmental change.
Dans la même collection
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 25
GENTREE Final Conference : Anna-Maria FARSAKOGLOU - Aristotle University of Thessaloniki · Greece GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 16
GENTREE Final Conference : Julie GAUZERE - University of Edinburgh · United Kingdom GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 8
GENTREE Final Conference : Benjamin DAUPHIN - WSL Birmensdorf · Switzerland GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment' 27-31
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 30
GENTREE Final Conference : Marcus LINDNER - European Forest Institute Bonn · Germany GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 22
GENTREE Final Conference : Erik KJAER - University of Copenhagen · Denmark GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment' 27-31
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 13
GENTREE Final Conference : José Alberto RAMÍREZ-VALIENTE - CIFOR-INIA Madrid · Spain GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment'
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 5
GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment'
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 27
GENTREE Final Conference : François LEFÈVRE - INRAE Avignon · France GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment' 27-31
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 19
GENTREE Final Conference : Cathleen PETIT-CAILLEUX - INRAE Avignon · France GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment'
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 10
GENTREE Final Conference : Natalia VIZCAINO PALOMAR - INRAE Bordeaux · France GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment' 27
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 2
GENTREE Final Conference : Antoine KREMER - INRAE Bordeaux · France GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment' 27-31 January 2020,
-
[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 24
GENTREE Final Conference : Sally AITKEN - University of British Columbia Vancouver · Canada GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing