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180 results for “contact zone”
Fig. 17. Habitats N in Hybridization Among Western Whiptail Lizards (Cnemidophorus Tigris) In Southwestern New Mexico: Population Genetics, Morphology, And Ecology In Three Contact Zones
Fig. 17. Habitats N of Steins, near the central transect (tables 2, 3; figs. 3, 5; appendix 1), 23 August 1990. Top. Looking N (from low hill behind allelemobile in fig. 16, top) across the grassland that separates site 16 (marmoratus) and site 12 (largely punctilinealis; figs. 3, 49). Bottom. Looking NE at grassland and alkali flats, from same place as the top photograph.
Fig. 2. Site 49 in Hybridization Among Western Whiptail Lizards (Cnemidophorus Tigris) In Southwestern New Mexico: Population Genetics, Morphology, And Ecology In Three Contact Zones
Fig. 2. Site 49 (appendix 2). Huerfano Butte (E side), Pima County, Arizona, about 43 km SSE Tucson, showing dramatic change in vegetation (desertification) in less than 70 years (based on Lowe et al., 1970a; their fig. 2). Top. About 1902, courtesy of Walter S. Phillips, University of Arizona Bottom. 16 March 1969.
Figure 3 from: Matern A, Drees C, Hardtle W, von Oheimb G, Assmann T (2011) Historical ecology meets conservation and evolutionary genetics: a secondary contact zone between Carabus violaceus (Coleoptera, Carabidae) populations inhabiting ancient and recent woodlands in north-western Germany. ZooKeys 100: 545-563. https://doi.org/10.3897/zookeys.100.1546
Figure 3 - Correlogram showing the result of spatial autocorrelation analysis at three allozyme loci. Genetic distances D (Nei 1972) are indicated for the population pairs of the respective distance classes (squares). Dashed lines show the 95% confidence interval (1000 permutations) under the null hypothesis of spatially random differentiation. Significant deviations from the mean are indicated by filled squares (p < 0.05).
Figure 4 from: Matern A, Drees C, Hardtle W, von Oheimb G, Assmann T (2011) Historical ecology meets conservation and evolutionary genetics: a secondary contact zone between Carabus violaceus (Coleoptera, Carabidae) populations inhabiting ancient and recent woodlands in north-western Germany. ZooKeys 100: 545-563. https://doi.org/10.3897/zookeys.100.1546
Figure 4 - Maximum width of the aedeagus tip A and the quotient of maximum and minimum width of the aedeagus tip B are plotted for each population. Boxes display 25–75%- quartiles and bars indicate medians. Whiskers show the total range of values without outliers. Outliers are indicated as circles and extreme outliers as diamonds. Numbers of measured individuals per population are shown in brackets. Pie charts show frequencies of elytral sculpture classes "0" (white), "1" (grey), and "2" (black) in each population. Significant differences between populations are indicated by the lines marked with asterisks.
Figure 1 from: Matern A, Drees C, Hardtle W, von Oheimb G, Assmann T (2011) Historical ecology meets conservation and evolutionary genetics: a secondary contact zone between Carabus violaceus (Coleoptera, Carabidae) populations inhabiting ancient and recent woodlands in north-western Germany. ZooKeys 100: 545-563. https://doi.org/10.3897/zookeys.100.1546
Figure 1 - Carabus violaceus populations studied and proportion of specimens with different elytron sculptures (pie charts). White sections indicate the frequencies of smooth elytra, black sections indicate the frequencies of more than three striae per elytron, and grey sections indicate the frequencies of intermediate phenotypes, i.e. class "1". Numbers next to the pie charts indicate population number followed by sample size in brackets. The location of the study area is indicated as a white square on the map of Germany. Woodlands in the study region northwest of the town of Bramsche according to TK 50 3512 Bramsche (Landesvermessungsamt Niedersachsen 1998) are presented as striped patches. Size and position of ancient woodlands (black patches) are taken from the map by LeCoq (1805). In this study, these are called "Börsteler Wald" (in the north) and "Gehn" (in the south). White patches within woodlands indicate openings. Hedges are not shown.
Figure 2 from: Matern A, Drees C, Hardtle W, von Oheimb G, Assmann T (2011) Historical ecology meets conservation and evolutionary genetics: a secondary contact zone between Carabus violaceus (Coleoptera, Carabidae) populations inhabiting ancient and recent woodlands in north-western Germany. ZooKeys 100: 545-563. https://doi.org/10.3897/zookeys.100.1546
Figure 2 - Aedeagus tip of Carabus violaceus. 1 Maximum aedeagus width (AedMax), 2 minimum aedeagus width (AedMin), and 3 preputial field.
From refugia to contact: pine processionary moth hybrid zone in a complex biogeographic setting
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Data from: Revisiting the Iberian honey bee (Apis mellifera iberiensis) contact zone: maternal and genome-wide nuclear variation provide support for secondary contact from historical refugia
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Data from: Selection on outlier loci and their association with adaptive phenotypes in Littorina saxatilis contact zones
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Data from: Assessing reproductive isolation using a contact zone between parapatric lake-stream stickleback ecotypes
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Data from: Experimental contact zones reveal causes and targets of sexual selection in hybridizing lizards
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Data from: Genetic data reveal fine-scale ecological segregation between larval plethodontid salamanders in replicate contact zones
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Data from: Sperm divergence in a passerine contact zone: indication of reinforcement at the gametic level
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Data from: Estimation of the dispersal of a major pest of maize by cline analysis of a temporary contact zone between two invasive outbreaks
Dispersal is a key factor in invasion, and in the persistence and evolution of species. Despite the importance of estimates of dispersal distance, dispersal measurement remains a real methodological challenge. In this study, we characterized dispersal by exploiting a specific case of biological invasion, in which multiple introductions in disconnected areas lead to secondary contact between two differentiated expanding outbreaks. By applying cline theory to this ecological setting, we estimated σ, the standard deviation of the parent-offspring distance distribution, of the western corn rootworm, Diabrotica virgifera virgifera, one of the most destructive pests of maize. This species is currently invading Europe, and the two largest invasive outbreaks, in Northern Italy and Central Europe, have recently formed a secondary contact zone in Northern Italy. We identified vanishing clines at 12 microsatellite loci throughout the contact zone. By analyzing both the rate of change of cline slope and the spatial variation of linkage disequilibrium at these markers, we obtained two σ estimates of about 20 km.generation−1/2. Simulations indicated that these estimates were robust to changes in dispersal kernels and differences in population density between the two outbreaks, despite a systematic weak bias. These estimates are consistent with the results of direct methods for measuring dispersal applied to the same species. We conclude that secondary contact resulting from multiple introductions is very useful for the inference of dispersal parameters and should be more widely used in other species.
Data from: Dobzhansky-Muller incompatibilities, dominance drive, and sex-chromosome introgression at secondary contact zones: a simulation study
Dobzhansky-Muller (DM) incompatibilities involving sex chromosomes have been proposed to account for Haldane's rule (lowered fitness among hybrid offspring of the heterogametic sex) as well as Darwin's corollary (asymmetric fitness costs with respect to the direction of the cross). We performed simulation studies of a hybrid zone to investigate the effects of different types of DM incompatibilities on cline widths and positions of sex-linked markers. From our simulations, X-Y incompatibilities generate steep clines for both X-linked and Y-linked markers; random effects may produce strong noise in cline center positions when migration is high relative to fitness costs, but X- and Y-centers always coincide strictly. X-autosome and Y-autosome incompatibilities also generate steep clines, but systematic shifts in cline centers occur when migration is high relative to selection, as a result of a dominance drive linked to Darwin's corollary. Interestingly, sex-linked genes always show farther introgression than the associated autosomal genes. We discuss ways of disentangling the potentially confounding effects of sex biases in migration, we compare our results to those of a few documented contact zones, and we stress the need to study independent replicates of the same contact zone.
Data from: Estimation of the dispersal of a major pest of maize by cline analysis of a temporary contact zone between two invasive outbreaks
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Data from: Dobzhansky-Muller incompatibilities, dominance drive, and sex-chromosome introgression at secondary contact zones: a simulation study
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Adverse prognosis of glioblastoma contacting the subventricular zone: biological correlates
GEO Series GSE134783. Homo sapiens. 71 samples. Type: Expression profiling by array.
FIGURE 1 in Characterization of a secondary contact zone of the Great Tit Parus major and the Japanese Tit P. minor (Aves: Passeriformes) in Far Eastern Siberia with DNA markers.
FIGURE 1. Map showing the sampled populations in the Amur River Valley. Upper pies on each location show the frequency of major (blue) and minor (red) haplotypes and lower pies the mean probabilities of individuals being assigned to major or minor based on microsatellites.
Figure 2 in Rare genetic admixture and unidirectional gene flow between Vipera aspis and Vipera berus at their contact zone in western France
Figure 2. NewHybrids results using Jeffreys priors of V. aspis and V. berus samples collected in the Loire Atlantique department (France). Morphologically intermediate individuals include individual 4.14 which was genetically assigned to V. aspis. The hybridization level of individuals 14 and 71 could not be clearly assigned. BcVa = F1 × Vipera aspis; BcVb = F1 × Vipera berus.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.