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39 results for “expansion patterns”
Fig. 5 A in Phylogeographic patterns of genetic diversity in the common spadefoot toad, Pelobates fuscus (Anura: Pelobatidae), reveals evolutionary history, postglacial range expansion and secondary contact
Fig. 5 A multilocus cline at four diagnostic allozyme loci along transect in the contact zone of Pelobates fuscus fuscus and P. f. vespertinus. The vertical axis shows the frequency of genetic variants diagnostic for P. f. fuscus (variation diagnostic for P. f. vespertinus is the inverse)
Fig. 2 in Phylogeographic patterns of genetic diversity in the common spadefoot toad, Pelobates fuscus (Anura: Pelobatidae), reveals evolutionary history, postglacial range expansion and secondary contact
Fig. 2 Unweighted pair group method with arithmetic mean phenogram (a) and neighbor-joining tree (b) showing genetic (allozyme) relationship among the Pelobates species populations sampled based on Nei's (1978) unbiased genetic distance (DNei); bootstrap values ≥ 70 %. Correspondence analysis of allele frequencies among the studied samples of P. fuscus (c), where dark circles represent P. f. vespertinus samples, gray circles are samples from the contact zone from Kursk Province of Russia, open circles are P. f. fuscus samples from Eastern
Data from: Sex-specific shifts in morphology and colour pattern polymorphism during range expansion of an invasive lizard
Aim: Human-assisted range expansion of animals to new environments can lead to phenotypic shifts over ecological timescales.We investigated whether phenotypic changes are sex-specific using an invasive lizard (Lampropholis delicata). Location: Pacific region (Hawaiian Islands, Lord Howe Island, New Zealand, eastern Australia) Methods: Using our knowledge of theintroduction history of L. delicata, we examined museum specimens of individuals collected across the native and introduced range to determine whether shifts in morphologyor colour pattern polymorphism had occurred during its range expansion, and if so, whether they differed between the sexes. Results: Sexual dimorphism in both size and shape was documented within the native range of the delicate skink. However, during range expansion, phenotypic shifts were observed in shape, but not size. In two of the three invasive populations, these phenotypic shifts were sex-specific. In the Hawaiian Islands, changes in shape were driven by males, whereas in New Zealand it was due to shifts in females.Similarly, changes in the frequency of a colour pattern polymorphism, a mid-lateral stripe shown to have sex-specific impacts on fitness (positive in females, negative in males), occurred following colonisation of the Hawaiian Islands and Lord Howe Island. In Hawaii, the incidence of the polymorphism increased over time in females, and decreased in males. Main conclusions: Phenotypic shifts during the range expansion of invasive species may be sex-specific, and are potentially related to the degree of realised niche shift that has occurred between the source and introduced range.
Data from: Patterns of genetic diversity reveal multiple introductions and recurrent founder effects during range expansion in invasive populations of Geranium carolinianum (Geraniaceae)
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Data from: Geography best explains global patterns of genetic diversity and post-glacial co-expansion in marine turtles
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Data from: Patterns of niche filling and expansion across the invaded ranges of an Australian lizard
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Data from: Thermal segregation drives patterns of alder and willow expansion in a montane ecosystem subject to climate warming
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Expansion of non-native plant Flaveria bidentis (L.) Kuntze driven by range of factors leading to patchy distribution patterns
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Data from: Long-term expansion of juniper populations in managed landscapes: patterns in space and time
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Data from: Sex-specific shifts in morphology and colour pattern polymorphism during range expansion of an invasive lizard
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Data from: Loci under selection during multiple range expansions of an invasive plant are mostly population-specific, but patterns are associated with climate
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Data from: Phylogeographic pattern of range expansion provides evidence for cryptic species lineages in Silene nutans in Western Europe
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Data from: Spatial variation in Allee effects influences patterns of range expansion
Allee effects are thought to slow range expansion and contribute to stable range boundaries. Recent studies have shown Allee effects to vary spatiotemporally due to influences of environmental heterogeneity on population processes. Gradients in Allee effects might occur as a species' range approaches suboptimal conditions while expanding into new territory. Allee effects could exhibit patchiness if drivers of positive density dependence (e.g., mate finding rates) are influenced by habitat patchiness. However, theoretical studies have largely assumed Allee effects to be spatially constant. The goal of this study was to evaluate how spatiotemporal patterns of range expansion respond to spatial variations in Allee effects. We simulated spread in landscapes that differed in the spatial configuration and range of Allee thresholds. We compared spread with a constant Allee effect to spread in landscapes where the Allee threshold varied along a gradient or in a patchy fashion. Landscape configuration affected patterns of range expansion when Allee thresholds were near or exceeded the number of colonizing immigrants. In gradient landscapes, spread decelerated as the range edge approached higher Allee thresholds. In patchy landscapes, spread advanced quickly through areas with lower Allee thresholds and stalled in areas with higher Allee thresholds. Both focal and neighboring locations influencing spread. Spatial variation in Allee effects may be an underappreciated source of heterogeneity in patterns of range expansion. When Allee effects vary, spread estimates based on a spatially averaged Allee threshold may not accurately predict realized rates of spread. Our findings suggest that spread can occur despite generally high Allee thresholds if Allee thresholds are low in a subset of patches. This result has negative implications for controlling the spread of invasive species, but it also suggests range shifts by native species in response to climate change may be possible with even sparsely distributed refugia from Allee effects.
Data from: Phylogeography and paleodistribution models of a widespread birch (Betula platyphylla Suk.) across East Asia: multiple refugia, multidirectional expansion, and heterogeneous genetic pattern
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Data from: Spatial variation in Allee effects influences patterns of range expansion
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Expansion of the circadian transcriptome in Brassica rapa supports genome wide diversification of homeolog gene expression patterns
GEO Series GSE123654. Brassica rapa subsp. trilocularis. 96 samples. Type: Expression profiling by high throughput sequencing.
Next Generation Sequencing (m6A-seq) Reveals RNA m6A Methylation Patterns During the Expansion of Tomato
GEO Series GSE178904. Solanum lycopersicum. 12 samples. Type: Expression profiling by high throughput sequencing; Methylation profiling by high throughput sequencing.
Fig. 4 in Phylogeographic patterns of genetic diversity in the common spadefoot toad, Pelobates fuscus (Anura: Pelobatidae), reveals evolutionary history, postglacial range expansion and secondary contact
Fig. 4 Geographic location of populations sampled in the contact zone between Pelobates fuscus fuscus and P. f. vespertinus in Kursk Province of Russia. a Light and dark sectors show the proportion of membership of each population in clusters of P. f. fuscus and P. f. vespertinus, respectively, according to results of the Structure analysis based on allozyme data; b sectors show proportion of individuals determined as pure parental species (P. f. fuscus in light and P. f. vespertinus in dark colors) and hybrid plus "intermediate" individuals (gray color) in each population, according to results of the New Hybrids analysis based on allozyme data; c light and dark sectors show the proportion of membership of each population in clusters of P. f. fuscus and P. f. vespertinus, respectively, according to cyt b data. Localities are numbered as in Table 1 and Fig. 1
Fig. 6 in Phylogeographic patterns of genetic diversity in the common spadefoot toad, Pelobates fuscus (Anura: Pelobatidae), reveals evolutionary history, postglacial range expansion and secondary contact
Fig. 6 Potential niche models (dark gray area) of Pelobates f. fuscus (a) and P. f. vespertinus (b) based on Maxent. Localities of P. f. fuscus and P. f. vespertinus are designated as triangles (b) and squares (a), respectively. Models are above the average 10-percentile training threshold
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Allen Brain Atlas
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