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68 results for “isolation–by–distance”
Data from: Phylogenetic diversity of two geographically overlapping species in the lichen genus Sticta (Ascomycota: Peltigeraceae): Isolation by distance, environment, or fragmentation?
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Data from: Fine-scale sampling reveals distinct isolation by distance patterns in chum salmon (Oncorhynchus keta) populations occupying a glacially dynamic environment
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Data from: Beyond isolation by distance: what best explains functional connectivity among populations of three sympatric plant species in an ancient terrestrial island system?
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Data from: Lack of genetic isolation by distance, similar genetic structuring but different demographic histories in a fig-pollinating wasp mutualism
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Data from: Multi-level patterns of genetic structure and isolation by distance in the widespread plant Mimulus guttatus
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An evaluation of isolation by distance (IBD) and isolation by resistance (IBR) on genetic structure of the Persian squirrel (Sciurus anomalus) in the Zagros forests of Iran
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Data from: Multi-level patterns in population genetics: variogram series detects a hidden isolation-by- distance- dominated structure of Scandinavian brown bears Ursus arctos
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Isolation by geographical distance after release from Pleistocene refugia explains genetic and phenotypic variation in Xylotrupes siamensis (Coleoptera: Scarabaeidae)
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Climate and ice in the last glacial maximum explain patterns of isolation by distance inferred for alpine grasshoppers
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Coalescent-based species delimitation is sensitive to geographic sampling and isolation by distance
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Data from: Isolation-by-distance in landscapes: considerations for landscape genetics
In landscape genetics, isolation-by-distance (IBD) is regarded as a baseline pattern that is obtained without additional effects of landscape elements on gene flow. However, the configuration of suitable habitat patches determines deme topology, which in turn should affect rates of gene flow. IBD patterns can be characterized either by monotonically increasing pairwise genetic differentiation (for example, FST) with increasing interdeme geographic distance (case-I pattern) or by monotonically increasing pairwise genetic differentiation up to a certain geographical distance beyond which no correlation is detectable anymore (case-IV pattern). We investigated if landscape configuration influenced the rate at which a case-IV pattern changed to a case-I pattern. We also determined at what interdeme distance the highest correlation was measured between genetic differentiation and geographic distance and whether this distance corresponded to the maximum migration distance. We set up a population genetic simulation study and assessed the development of IBD patterns for several habitat configurations and maximum migration distances. We show that the rate and likelihood of the transition of case-IV to case-I FST–distance relationships was strongly influenced by habitat configuration and maximum migration distance. We also found that the maximum correlation between genetic differentiation and geographic distance was not related to the maximum migration distance and was measured across all deme pairs in a case-I pattern and, for a case-IV pattern, at the distance where the FST–distance curve flattens out. We argue that in landscape genetics, separate analyses should be performed to either assess IBD or the landscape effects on gene flow.
Drivers of intraspecific differentiation of the alpine cold tolerant herb Notopterygium oviforme: the roles of isolation by distance and ecological factors
<p>Determining the driver mechanisms of phenotypic and genetic divergence of species have long been the central topic in evolutionary biology. However, the relative roles of isolation by distance (IBD) and environment factors in contributing to species divergence is largely undetermined in perennial herbs in East Asia. In this study, we collected population genetic samples of a cold-tolerant perennial herb <i>Notopterygium oviforme</i> in central China. We integrated the population transcriptomes, whole chloroplast genomes, genotyping-by-sequencing, microsatellite markers and ecological environment factors to determine the relative contributions of geography, climatic and soil factors on genetic, chemical and phenotypic trait divergence. The clearly genetic distinction was identified between the west Qinling (WQ) and east Qinling Mountains (EQ) geographical groups within<i> N. oviforme</i>. Interestingly, the two groups have existed the obviously niche conservatism, which might have caused the similarity of most leaf functional traits. Multiple matrix regression with randomization analysis showed that the spatial pattern of intraspecific divergence mainly resulted from effect of IBD, not isolation by environment. Meanwhile, transcriptomic expression divergence and some ecological factors have played the key roles in differentiation of intraspecific lineage. Approximate Bayesian Computation showed that both lineages have experienced the historically population expansion, and the recent range contraction. Molecular dating suggested that the intraspecific divergence was closely associated with the dramatically uplifts of the Qinling Mountains in East Asia. These results demonstrated that the geography, geological and environmental factors together shaped the cryptic intraspecific diversification and population dynamics shifts of<i> </i>perennial cold tolerant herb.</p>
Data from: Relationship between genetic distances and postzygotic reproductive isolation in diploid Fragaria (Rosaceae)
Studies of reproductive isolation are important for understanding speciation and species delimitation. We studied seven components of reproductive isolation at different taxonomic and geographical levels and their relationship with genetic distance in diploid Fragaria. Isolation was only evident between different taxa at later stages (post F1 survivorship) not at the earlier ones of fruit and seed set, F1 seed germination and survivorship. Within F. vesca, isolation at the later stages was positively correlated with genetic distance, but this was not found at interspecific levels. The lack of isolation between F. vesca and the other species at the early stages provide the chance for hybrid formation, but high levels of infertility expressed among the offspring can lead to potentially opposing evolutionary outcomes. Within F. vesca, there was evidence of unexpected isolation promoting evolutionary diversification and incipient speciation. Reproductive isolation values between sympatric and allopatric species pairs were similar and indicate a lack of reinforcement in Fragaria. This, combined with the lack of correlation between genetic distance and isolation at interspecific levels shows that genetic distance is not always proportionally correlated with the degree of isolation in plants and suggests that evolutionary processes may be playing differently in plants compared to animals.
Random Similarity Isolation Forest - precalculated distances matrices
<p>Precalculated distance matrices for Random Similarity Isolation Forest algorithm.</p>
Drivers of intraspecific differentiation of the alpine cold tolerant herb Notopterygium oviforme: the roles of isolation by distance and ecological factors
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Data from: Relationship between genetic distances and postzygotic reproductive isolation in diploid Fragaria (Rosaceae)
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Data from: The trouble with isolation by distance
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Data from: Isolation-by-distance in landscapes: considerations for landscape genetics
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Transcriptional responses of fungi (Rhizopus microsporus host [ATCC5 2813] and non-host [ATCC 11559] isolates) and bacteria (Burkholderia sp B13 ) to interaction with each other at a distance (pre-con
GEO Series GSE98095. Rhizopus microsporus ATCC 52813; Burkholderia sp. b13. 24 samples. Type: Expression profiling by high throughput sequencing.
Data from: Climatic suitability, isolation by distance and river resistance explain genetic variation in a Brazilian whiptail lizard
Spatial patterns of genetic variation can help understand how environmental factors either permit or restrict gene flow and create opportunities for regional adaptations. Organisms from harsh environments such as the Brazilian semiarid Caatinga biome may reveal how severe climate conditions may affect patterns of genetic variation. Herein we combine information from mitochondrial DNA with physical and environmental features to study the association between different aspects of the Caatinga landscape and spatial genetic variation in the whiptail lizard Ameivula ocellifera. We investigated which of the climatic, environmental, geographical and/or historical components best predict: (1) the spatial distribution of genetic diversity, and (2) the genetic differentiation among populations. We found that genetic variation in A. ocellifera has been influenced mainly by temperature variability, which modulates connectivity among populations. Past climate conditions were important for shaping current genetic diversity, suggesting a time lag in genetic responses. Population structure in A. ocellifera was best explained by both isolation by distance and isolation by resistance (main rivers). Our findings indicate that both physical and climatic features are important for explaining the observed patterns of genetic variation across the xeric Caatinga biome.
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