A weighted difference barrier method in landscape genetics

Mu, Lan; Radke, John

doi:10.1007/s10109-009-0079-7

Cited by 3 publications

(2 citation statements)

References 34 publications

(45 reference statements)

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“…Despite this, there was no significant accumulation of genetic diversity in downstream populations along the main channel. This result suggests that hydrochory is not sufficient to produce a clear unidirectional gene flow along the water course, although it may Identifying potential barriers that cause the fragmentation of lineages of terrestrial organisms is one of the major focuses of landscape genetics (e.g., Manni et al 2004;O'Connell et al 2006;Mu and Radke 2009). For instance, mountain ridges may provide geographical barriers that obstruct gene flow, thus producing genetic differentiation between populations across mountain ridges (e.g., Taberlet et al 1998).…”

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confidence: 89%

Multiple-scaled spatial genetic structures of Fraxinus mandshurica over a riparian–mountain landscape in Northeast China

Uchiyama

Shen

et al. 2009

Conserv Genet

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Landscape genetics increasingly focuses on the way in which landscape features cause the fragmentation of lineages of terrestrial organisms. However, landscape features can also provide functional connectivity or corridors, enhancing the dispersal of plant populations, particularly the case in riparian habitat. Unfortunately, recent research in tree genetics has paid little attention to this role. To examine the possible effects of landscape connectivity on the current population genetic distribution of Fraxinus mandshurica and to provide insights into conserving the local genetic diversity for this endangered tree species, we used nine nuclear microsatellite loci to examine the spatial genetic structure of F. mandshurica at multiple-scales over a riparian-mountain landscape in Northeast China. F-statistics indicated that the magnitude of among-population genetic differentiation was significantly higher between the riparian and mountain habitats than within the riparian habitat. Spatial analysis of molecular variance and principal coordinate analysis consistently revealed that this species exhibited a clear landscape genetic structure between the riparian and mountain habitats, despite no significant isolation by distance pattern being identified by the Mantel test. Spatial autocorrelation analysis further demonstrated significant, positive fine-scale spatial genetic structure among individuals over short distances (\80 m) in each mountain population. Conversely, no spatial genetic structures were identified within and among the riparian populations. Overall, the results suggest that seed dispersal is very low among mountain populations; however seed transport is probably enhanced by a secondary phase of hydrochory (water-dispersal) among riparian populations during flooding. Despite this, there was no significant accumulation of genetic diversity in downstream populations along the main channel. This result suggests that hydrochory is not sufficient to produce a clear unidirectional gene flow along the water course, although it may impede the development of spatial genetic structuring within and among riparian populations.

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confidence: 89%

Multiple-scaled spatial genetic structures of Fraxinus mandshurica over a riparian–mountain landscape in Northeast China

Uchiyama

Shen

et al. 2009

Conserv Genet

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“…One approach to the evaluation of landscape barriers in the role of species differentiation and disease transmission is an area of landscape ecology called wombling (Womble 1954), named for the first author to publish this idea. Approaches to wombling in the geography literature have been algorithmic (Monmonier 1979;Mu and Radke 2009), while approaches in the statistics literature have been model-based. Lu and Carlin (2005) first used a Bayesian hierarchical model-based framework for wombling and Lu et al (2007) also considered covariates when performing Bayesian areal wombling.…”

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confidence: 99%

Spatial analysis linking landscape features and genetic population structure in cougars ($Puma concolor$) in the northern Rocky Mountains

Waller

Wheeler

2012

Statistics and Its Interface

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Landscape genetics is a field of research that seeks to understand the drivers of the observed spatial distribution of genetic variation in a species of plant or animal using methods from population genetics, landscape ecology, geography, and spatial statistics. One of the important research areas in landscape genetics is to identify landscape barriers to genetic flow. Barriers can limit interaction of organisms and hence lead to genetic structure (i.e. frequency of genotypes) in a population that becomes increasingly spatially structured over time. Here, we investigate model-based spatial methods to assess the relationship between landscape and genotype distributions of cougars (Puma concolor) in Western North America. Previous research has assessed genetic differentiation in cougars in North America using a non-spatial Bayesian clustering model and found evidence of genetic population structure in cougars, with suggestive but indistinct spatial boundaries between subpopulations. To determine if including spatial information on samples in a classification model would refine the observed spatial signal within the genetic population structure, we applied Bayesian classification models to microsatellite loci data with associated spatial locations. The spatial model revealed two clearly differentiated cougar subpopulations, in contrast to the two overlapping subpopulations suggested by methods not accounting for space. We also explored through geographic information systems and generalized linear models whether resulting genetic population structure boundaries aligned with landscape features. The spatial correspondence of genetic subpopulations and a major river and road is suggestive of possible landscape barriers to cougar movement. This study demonstrates that the use of explicit spatial information and Bayesian classification models adds novel insight when investigating genetic population structure in a species.

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Scallop Genetics and Genomics

Krause¹,

Brand²

2016

Developments in Aquaculture and Fisheries Science

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A weighted difference barrier method in landscape genetics

Cited by 3 publications

References 34 publications

Multiple-scaled spatial genetic structures of Fraxinus mandshurica over a riparian–mountain landscape in Northeast China

Multiple-scaled spatial genetic structures of Fraxinus mandshurica over a riparian–mountain landscape in Northeast China

Spatial analysis linking landscape features and genetic population structure in cougars ($Puma concolor$) in the northern Rocky Mountains

Scallop Genetics and Genomics

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