Landscape permeability and individual variation in a dispersal-linked gene jointly determine genetic structure in the Glanville fritillary butterfly

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DiLeo , M F , Husby , A & Saastamoinen , M 2018 , ' Landscape permeability and individual variation in a dispersal-linked gene jointly determine genetic structure in the Glanville fritillary butterfly ' , Evolution Letters , vol. 2 , no. 6 , pp. 544-556 . https://doi.org/10.1002/evl3.90

Title: Landscape permeability and individual variation in a dispersal-linked gene jointly determine genetic structure in the Glanville fritillary butterfly
Author: DiLeo, Michelle F.; Husby, Arild; Saastamoinen, Marjo
Contributor: University of Helsinki, External Funding
University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, External Funding
Date: 2018-12
Language: eng
Number of pages: 13
Belongs to series: Evolution Letters
ISSN: 2056-3744
URI: http://hdl.handle.net/10138/294745
Abstract: There is now clear evidence that species across a broad range of taxa harbor extensive heritable variation in dispersal. While studies suggest that this variation can facilitate demographic outcomes such as range expansion and invasions, few have considered the consequences of intraspecific variation in dispersal for the maintenance and distribution of genetic variation across fragmented landscapes. Here, we examine how landscape characteristics and individual variation in dispersal combine to predict genetic structure using genomic and spatial data from the Glanville fritillary butterfly. We used linear and latent factor mixed models to identify the landscape features that best predict spatial sorting of alleles in the dispersal-related gene phosphoglucose isomerase (Pgi). We next used structural equation modeling to test if variation in Pgi mediated gene flow as measured by F-st at putatively neutral loci. In a year when the population was recovering following a large decline, individuals with a genotype associated with greater dispersal ability were found at significantly higher frequencies in populations isolated by water and forest, and these populations showed lower levels of genetic differentiation at neutral loci. These relationships disappeared in the next year when metapopulation density was high, suggesting that the effects of individual variation are context dependent. Together our results highlight that (1) more complex aspects of landscape structure beyond just the configuration of habitat can be important for maintaining spatial variation in dispersal traits and (2) that individual variation in dispersal plays a key role in maintaining genetic variation across fragmented landscapes.
Subject: Dispersal
eco-evolutionary dynamics
fst
gene flow
genetic structure
intraspecific variation
landscape genetics
landscape matrix
metapopulation
LIFE-HISTORY VARIATION
PHOSPHOGLUCOSE-ISOMERASE
HABITAT FRAGMENTATION
POPULATION-STRUCTURE
MODEL SELECTION
METABOLIC-RATE
R PACKAGE
EVOLUTION
PGI
METAPOPULATION
1181 Ecology, evolutionary biology
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