Identifying the Environmental Factors That Determine the Genetic Structure of Populations

Foll, Matthieu; Gaggiotti, Oscar E.

doi:10.1534/genetics.106.059451

Cited by 318 publications

(404 citation statements)

References 37 publications

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“…We used the software GESTE 2.0 (Foll and Gaggiotti 2006) to identify population structure determinants using a Bayesian approach. The F ST values for each grid cell are calculated and the effect of environmental factors versus genetic drift on genetic divergence was evaluated using a generalized linear model for the grid cells (described above).…”

Section: Determinants Of Genetic Structurementioning

confidence: 99%

Red foxes colonizing the tundra: genetic analysis as a tool for population management

et al. 2016

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Climate change accelerates biodiversity alterations in northern ecosystems. A prevalent example is that tundra regions are invaded by boreal species. This impacts negatively on native species through competition, predation and transmission of zoonoses. Scandinavian red foxes (Vulpes vulpes) have emerged into the tundra and have altered the structure and function of the tundra community. For instance, they threaten persistence of the endangered Swedish Arctic fox (Vulpes lagopus). County board administrations implement control of the tundra red foxes, but little is known about the underlying expansion dynamics. A broad-scale study revealed high connectivity where northern areas were supplemented with red foxes from surrounding population. However, red fox expansion is most prevalent in tundra regions and the fine-scaled expansion dynamics in these areas have not yet been disseminated. With the aim of identifying the invasive pathways of tundra red foxes, we present microsatellite data for 205 Swedish red foxes and mitochondrial sequence variation in 102 foxes sampled across the historical boreonemoral distribution and recently colonized tundra regions. Genetic structuring was low with high levels of ongoing, asymmetric dispersal from surrounding boreal zones into tundra habitats causing high genetic admixture. In both tundra and boreo-nemoral regions, inter-individual relatedness decreased with increasing geographic distance and data suggests male-biased dispersal patterns. Overall, finescaled expansion patterns were affected by multiple factors and we discuss its implications for future red fox management.

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Section: Determinants Of Genetic Structurementioning

confidence: 99%

Red foxes colonizing the tundra: genetic analysis as a tool for population management

et al. 2016

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“…B 281: 20140949 differences in allele and genotype frequencies found between the two population types. We used the program GESTE [56] to compare eight alternative models of population differentiation. GESTE uses a Bayesian method to estimate population-specific F ST -values based on genetic data, and then relates these estimates to environmental explanatory variables using a generalized linear model framework [56].…”

Section: (B) Statistical Analysis Of Female Mate Preferencesmentioning

confidence: 99%

“…We used the program GESTE [56] to compare eight alternative models of population differentiation. GESTE uses a Bayesian method to estimate population-specific F ST -values based on genetic data, and then relates these estimates to environmental explanatory variables using a generalized linear model framework [56]. In this analysis, we used allele count data that were corrected for the presence of null alleles using the Oosterhout correction algorithm implemented in MICRO-CHECKER [52].…”

Section: (B) Statistical Analysis Of Female Mate Preferencesmentioning

confidence: 99%

Reinforcement generates reproductive isolation between neighbouring conspecific populations of spadefoot toads

Pfennig

Rice

2014

Proc. R. Soc. B.

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Reproductive character displacement is the adaptive evolution of traits that minimize deleterious reproductive interactions between species. When arising from selection to avoid hybridization, this process is referred to as reinforcement. Reproductive character displacement generates divergence not only between interacting species, but also between conspecific populations that are sympatric with heterospecifics versus those that are allopatric. Consequently, such conspecific populations can become reproductively isolated. We compared female mate preferences in, and evaluated gene flow between, neighbouring populations of spadefoot toads that did and did not occur with heterospecifics (mixed-and pure-species populations, respectively). We found that in mixed-species populations females significantly preferred conspecifics. Such females also tended to prefer a conspecific call character that was dissimilar from heterospecifics. By contrast, females from pure-species populations did not discriminate conspecific from heterospecific calls. They also preferred a more exaggerated conspecific call character that resembles heterospecific males. Moreover, gene flow was significantly reduced between mixed-and pure-species population types. Thus, character displacement (and, more specifically, reinforcement) may initiate reproductive isolation between conspecific populations that differ in interactions with heterospecifics.

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“…In order to verify the null hypothesis that divergence rates are not associated with longitude, latitude or species density, we used the Bayesian approach implemented in GESTE 2.0 software (Foll and Gaggiotti 2006). Briefly, the method uses the specific prior distribution for F i making the parameter to be a linear function of explanatory variables (e.g.…”

Section: Patterns Of Genetic Divergence Genetic Variation and Inbreementioning

confidence: 99%

Population at the edge: increased divergence but not inbreeding towards northern range limit in Acer campestre

Chybicki

Waldon‐Rudzionek

Meyza

2014

Tree Genetics & Genomes

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Ecological conditions shape natural distribution of plants. Populations are denser in optimal habitats but become more fragmented in the areas of suboptimal environmental conditions. Usually, fragmentation increases towards the limits of species distribution. Fragmented populations are often characterised by decreased genetic variation, and this effect is frequent in peripheral populations, mostly due to the reduced effective population size. Interestingly, the genetic consequences of fragmentation seem to be relatively weak in forest trees. Using microsatellite markers, we assessed the impact of population fragmentation on the genetic structure of a European tree species Acer campestre. Within the study area, this medium-size wind-dispersed and insect-pollinated tree reveals a gradual decrease in population density towards the northern range limit. Over the distance of 150 km, we detected the significant decrease in allelic richness, heterozygosity as well as an increase in the rate of population divergence along with latitude. On the other hand, we failed to show that the observed patterns of genetic structure result from the variation in population densities. Moreover, inbreeding levels revealed no association with both density and geographic location, suggesting that pollen limitation does not occur, even at the range margin. As we showed that there is no difference in a dispersal scale between low-and highdensity populations in the study species, we argue that the genetic structure is a result of postglacial recolonization. However, unlike many other forest trees, A. campestre showed the sharp latitudinal genetic pattern at a very restricted spatial scale. Limited dispersal and high fragmentation are likely the reasons.

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Identifying the Environmental Factors That Determine the Genetic Structure of Populations

Cited by 318 publications

References 37 publications

Red foxes colonizing the tundra: genetic analysis as a tool for population management

Red foxes colonizing the tundra: genetic analysis as a tool for population management

Reinforcement generates reproductive isolation between neighbouring conspecific populations of spadefoot toads

Population at the edge: increased divergence but not inbreeding towards northern range limit in Acer campestre

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