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opencc-by-4.0Oct 2017View details →

Genome-wide population structure and admixture analysis reveals weak differentiation among Ugandan goat breeds

Summary Uganda is endowed with a large population of goats from predominantly indigenous breeds reared in diverse production systems, whose existence is threatened by crossbreeding with exotic Boer goats. Knowledge about the genetic characteristics and relationships among these Ugandan goat breeds and the potential admixture of the exotic breed Boer is still limited. Using a medium density single nucleotide polymorphism (SNP) panel, we assessed the genetic diversity, population structure and admixture in six Ugandan goat breeds. Samples from five indigenous Ugandan goat breeds including Mubende (n=29), Kigezi (n=29), Small East African (n=29), Sebei (n=29) and Karamojong (n=15), and the exotic breed Boer (n=13) from different agro-ecological regions of Uganda were genotyped using the GoatSNP50 BeadChip. Analysis of genotype data revealed high levels of polymorphism with the proportion of polymorphic SNPs ranging from 0.885 in Kigezi to 0.928 in Sebei. The overall mean genetic diversity indices across breeds for HO and HE was 0.355±0.147 and 0.384±0.143 respectively. Principle components, genetic distances and ADMIXTURE analyses revealed weak population sub-structuring among the breeds. Principle components separate Kigezi and weakly Small East African from other indigenous goats. Sebei and Karamojong are tightly entangled together while Mubende occupies a more central position with high admixture from all other local breeds. The Boer breed showed a unique cluster from the Ugandan indigenous goat breeds. The results reflect common ancestry but also some level of geographical differentiation. ADMIXTURE and four population test analyses further revealed gene-flow from Boer to Ugandan indigenous goat breeds and varying levels of admixture among the Ugandan indigenous breeds. Generally, moderate to high levels of genetic variability were observed in the Ugandan goat breeds. Our findings provide useful insight to devise strategies to maintain genetic diversity in local goat breeds from Uganda and to design appropriate breeding programs to exploit within breed diversity and heterozygote advantage in cross-breeding schemes.

opencc-by-4.0May 2024View details →

Correlation-based Analysis of the Influence of Bound Constraint Handling Methods on Population Dynamics in Differential Evolution

The dataset is  based on the average values collected over 5 independent runs, considering the largest common number of iterations for LSHADE algorithm coupled with ’sat’, ’midT’, ’midB’, ’unif’, ’beta’, ’mir’, ’tor’, ’expC_R’, ’expC_T’, ’expC_B’, ’vectR’, ’vectT’, ’vectB’, ’mahalanobis’ correction methods, on BBOB function f3, 4, 5, 16, 23, instance 1 Plots for the averaged values are included for measures 'pop_size', 'best', 'error', 'prob_infeas', 'genMutatedComponent', 'genSuccessMutants','meanImprovements', 'varPop', 'avgF', 'avgCR', 'extension', 'shape', 'eccentricity', 'kl_unif'

Fig. 6. RAPD band patterns and mean heterozygosity across S in MORPHOLOGICALAND GENETIC DIFFERENTIATION OF SAXIFRAGA HIRCULUS L. (SAXIFRAGACEAE) POPULATIONS IN LITHUANIA Edita Meškauskaitė, Donatas Naugžemys, Donatas Žvingila, Jonas Remigijus

Fig. 6. RAPD band patterns and mean heterozygosity across S. hirculus populations in Lithuania

Fig. 2 in MORPHOLOGICALAND GENETIC DIFFERENTIATION OF SAXIFRAGA HIRCULUS L. (SAXIFRAGACEAE) POPULATIONS IN LITHUANIA Edita Meškauskaitė, Donatas Naugžemys, Donatas Žvingila, Jonas Remigijus

Fig. 2. Variation in morphologic features of S. hirculus generative individuals in Lithuania

Fig. 1 in MORPHOLOGICALAND GENETIC DIFFERENTIATION OF SAXIFRAGA HIRCULUS L. (SAXIFRAGACEAE) POPULATIONS IN LITHUANIA Edita Meškauskaitė, Donatas Naugžemys, Donatas Žvingila, Jonas Remigijus

Fig. 1. The location of S. hirculus research sites in Lithuan

Fig. 3 in MORPHOLOGICALAND GENETIC DIFFERENTIATION OF SAXIFRAGA HIRCULUS L. (SAXIFRAGACEAE) POPULATIONS IN LITHUANIA Edita Meškauskaitė, Donatas Naugžemys, Donatas Žvingila, Jonas Remigijus

Fig. 3. Frequency distribution of runners per S. hirculus floral shoot in the studied populations

opencc-by-4.0Mar 2024View details →

Figure 5 in Pleistocene population differentiation in the ant Myrmica scabrinodis (Hymenoptera: Formicidae) - a taxonomic borderline case

Figure 5. Measuring the maximum width of scape at lobe level.

opencc-zeroJan 2023View details →

Genomic diversity and differentiation between island and mainland populations of White‐tailed Eagles (Haliaeetus albicilla)

Using whole genome shotgun sequences from 92 white-tailed eagles (Haliaeetus albicilla) sampled from Greenland, Iceland, Norway, Denmark, Estonia, and Turkey between 1885–1950 and after 1990, we investigate the genomic variation within countries over time, and between countries. Clear signatures of ancient biogeographic substructure across Europe and the North‐East Atlantic are observed. The greatest genomic differentiation was observed between island (Greenland and Iceland) and mainland (Denmark, Norway and Estonia) populations. The two island populations share a common ancestry from a single mainland population, distinct from the other sampled mainland populations, and despite the potential for high connectivity between Iceland and Greenland they are well separated from each other and are characterized by inbreeding and little variation. Temporal differences also highlight a pattern of regional populations persisting despite the potential for admixture. All sampled populations generally showed a decline in effective population size over time, which may have been shaped by four historical events: I) isolation of refugia during the last glacial period 110‐115,000 years ago, II) population divergence following the colonization of the deglaciated areas ~10,000 years ago, III) human population expansion, which led to the settlement in Iceland ~1,100 years ago, and IV) human persecution and exposure to toxic pollutants during the last two centuries.

opencc-zeroMar 2023View details →

Data from: Differential gene expression and mitonuclear incompatibilities in fast- and slow-developing inter-population Tigriopus californicus hybrids

Mitochondrial functions are intimately reliant on proteins and RNAs encoded in both the nuclear and mitochondrial genomes, leading to inter-genomic coevolution within taxa. Hybridization can break apart coevolved mitonuclear genotypes, resulting in decreased mitochondrial performance and reduced fitness. This hybrid breakdown is an important component of outbreeding depression and early-stage reproductive isolation. However, the mechanisms contributing to mitonuclear interactions remain poorly resolved. Here we scored variation in developmental rate (a proxy for fitness) among reciprocal F2 inter-population hybrids of the intertidal copepod Tigriopus californicus, and used RNA sequencing to assess differences in gene expression between fast- and slow-developing hybrids. In total, differences in expression associated with developmental rate were detected for 2,925 genes, whereas only 135 genes were differentially expressed as a result of differences in mitochondrial genotype. Up-regulated expression in fast developers was enriched for genes involved in chitin-based cuticle development, oxidation-reduction processes, hydrogen peroxide catabolic processes, and mitochondrial respiratory chain complex I. In contrast, up-regulation in slow developers was enriched for DNA replication, cell division, DNA damage, and DNA repair. Eighty-four nuclear-encoded mitochondrial genes were differentially expressed between fast- and slow-developing copepods, including twelve subunits of the electron transport system (ETS) which all had higher expression in fast developers than in slow developers. Nine of these genes were subunits of ETS complex I. Our results emphasize the major roles that mitonuclear interactions within the ETS, particularly in complex I, play in hybrid breakdown, and resolve strong candidate genes for involvement in mitonuclear interactions.

opencc-zeroSep 2023View details →

Soil composition, phenotypic and genetic data to: Adaptive differentiation on serpentine soil in diploid versus autotetraploid populations of Biscutella laevigata (Brassicaceae)

Serpentine soils exhibit extreme properties (e.g. high magnesium content) influencing plant growth and survival and have been repeatedly documented to promote adaptive edaphic differentiation in plants. Individuals from four pairs of nearby diploid and autotetraploid populations of Biscutella laevigata sampled on serpentine vs non-serpentine soils in a factorial design are used to assess the genetic and phenotypic changes associated with edaphic origin and ploidy level. Individual samples from natural populations were subjected to soil elemental analysis and genotyping using restriction site-associated DNA sequences (RAD-seq) to link genetic variation with contrasting soils and ploidy levels. In diploids, genetic variation was consistent with demographic contraction and a pattern of isolation by environment with respect to the ratio of calcium / magnesium concentrations, whereas tetraploids presented evidence of expansion with limited edaphic differentiation. The genetic basis of tolerance and adaptation to serpentine was further assessed experimentally on seed-grown individuals from all populations subjected to high (serpentine-like) vs low (control) concentrations of magnesium in hydropony. Fitness-related phenotypic traits under experimental cultivation were consistent with adaptive differentiation among diploid ecotypes but not among the tetraploids that similarly grow in both habitats and consistently present higher investment in roots. Further work comparing experimentally resynthesized polyploids to natural diploids and polyploids has to tease the role of whole genome duplication apart from the impact of post-polyploidy evolution.

opencc-zeroSep 2023View details →

Data from: Evolutionarily labile dispersal behavior and discontinuous habitats enhance population differentiation in island vs continentally distributed swallows

The causes of population divergence in vagile groups remain a paradox in evolutionary biology: dispersive species should be able to colonize new areas, a prerequisite for allopatric speciation, but dispersal also facilitates gene flow, which erodes population differentiation. Strong dispersal ability has been suggested to enhance divergence in patchy habitats and inhibit divergence in continuous landscapes, but empirical support for this hypothesis is lacking. Here we compared patterns of population divergence in a dispersive clade of swallows distributed across both patchy and continuous habitats. The Pacific Swallow (Hirundo tahitica) has an insular distribution throughout Southeast Asia and the Pacific, while its sister species, the Welcome Swallow (H. neoxena), has a continental distribution in Australia. We used whole-genome data to demonstrate strong genetic structure and limited introgression among insular populations, but not among continental populations. Demographic models show that historic changes in habitat connectivity have contributed to population structure within the clade. Swallows appear to exhibit evolutionarily labile dispersal behavior in which they reduce dispersal propensity after island colonization despite retaining strong flight ability. Our data support the hypothesis that fragmented habitats enhance population differentiation in vagile groups, and suggest that labile dispersal behavior is a key mechanism underlying this pattern.