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100 results for “long-distance dispersal”
Data from: Genetic uniformity and long-distance clonal dispersal in the invasive androgenetic Corbicula clams
The clam genus Corbicula is an interesting model system to study the evolution of reproductive modes since it includes both sexual and asexual (androgenetic) lineages. While the sexual populations are restricted to the native Asian areas, the androgenetic lineages are widely distributed being also found in America and Europe where they form a major aquatic invasive pest. We investigated the genetic diversity of native and invasive Corbicula populations through a worldwide sampling. The use of mitochondrial and nuclear (microsatellite) markers revealed an extremely low diversity in the invasive populations with only four, undiversified, genetic lineages distributed across Europe and America. On the contrary, in the native populations, both sexual and androgenetic lineages exhibited much higher genetic diversity. Remarkably the most abundant and widely distributed invasive forms, the so-called form A and form R found in America and Europe respectively, are fixed for the same single COI (cytochrome c oxydase subunit I) haplotype and same multilocus genotype. This suggests that form R, observed in Europe since the 1980s, derived directly from form A found in America since the 1920s. In addition, this form shares alleles with some Japanese populations indicating a Japanese origin for this invasive lineage. Finally, our study suggests that few androgenetic Corbicula individuals successfully invaded the non-native range and then dispersed clonally. This is one striking case of genetic paradox raising the issue of invasive and evolutionary success of genetically undiversified populations.
FIGURE 9 in New species of Crotonia (Acari: Oribatida: Crotoniidae) from Lord Howe and Norfolk Islands: further evidence of long-distance dispersal events in the biogeography of a genus of Gondwanan relict oribatid mites
FIGURE 9. Distribution of Crotonia species-groups in the South-western Pacific region.
FIGURE 7 in New species of Crotonia (Acari: Oribatida: Crotoniidae) from Lord Howe and Norfolk Islands: further evidence of long-distance dispersal events in the biogeography of a genus of Gondwanan relict oribatid mites
FIGURE 7. Crotonia utricularia sp. nov. tritonymph a) dorsal; b) ventral.
FIGURE 6 in New species of Crotonia (Acari: Oribatida: Crotoniidae) from Lord Howe and Norfolk Islands: further evidence of long-distance dispersal events in the biogeography of a genus of Gondwanan relict oribatid mites
FIGURE 6. Crotonia utricularia sp. nov. deutonymph a) dorsal; b) ventral.
FIGURE 3 in New species of Crotonia (Acari: Oribatida: Crotoniidae) from Lord Howe and Norfolk Islands: further evidence of long-distance dispersal events in the biogeography of a genus of Gondwanan relict oribatid mites
FIGURE 3. Crotonia gorgonia sp. nov. paratype deutonymph a) dorsal; b) ventral.
FIGURE 1 in New species of Crotonia (Acari: Oribatida: Crotoniidae) from Lord Howe and Norfolk Islands: further evidence of long-distance dispersal events in the biogeography of a genus of Gondwanan relict oribatid mites
FIGURE 1. Crotonia gorgonia sp. nov. dorsal a) holotype female; b) paratype male.
FIGURE 5 in New species of Crotonia (Acari: Oribatida: Crotoniidae) from Lord Howe and Norfolk Islands: further evidence of long-distance dispersal events in the biogeography of a genus of Gondwanan relict oribatid mites
FIGURE 5. Crotonia utricularia sp. nov. holotype female a) dorsal; b) ventral.
FIGURE 2 in New species of Crotonia (Acari: Oribatida: Crotoniidae) from Lord Howe and Norfolk Islands: further evidence of long-distance dispersal events in the biogeography of a genus of Gondwanan relict oribatid mites
FIGURE 2. Crotonia gorgonia sp. nov. ventral a) holotype female; b) paratype male.
Data from: Occasional long-distance dispersal may not prevent inbreeding in a threatened butterfly
<p><strong>Background:</strong> To set up successful conservation measures, detailed knowledge on the dispersal and colonization capacities of the focal species and connectivity between populations is of high relevance. We developed species-specific nuclear microsatellite molecular markers for the grayling (<i>Hipparchia semele</i>), a butterfly endemic to Europe and of growing conservation concern in North-West Europe, and report on its population genetics, in a fragmented, anthropogenic landscape in Belgium. Our study included samples from 23 different locations nested in two regions and additional historical samples from two locations. We assessed contemporary<span>, </span><span><span>long-distance</span></span><span> disper</span>sal based on genetic assignment tests and investigated the effect of habitat loss and fragmentation on the population genetic structure and genetic variation using data of nine microsatellite loci.</p> <p><strong>Results:</strong> Detected dispersal events covered remarkably long distances, which were up to ten times larger than previously reported colonisation distances, with the longest movement recorded in this study even exceeding 100 km. However, observed frequencies of<span> </span><span><span>long-distance</span></span><span> </span>dispersal were low. Our results point to the consequences of the strong population decline of the last decades, with evidence of inbreeding in 72% of the recently sampled populations and low estimates of effective population sizes (<i>Ne</i>) (ranging from 20 to 54 individuals).</p> <p><strong>Conclusions:</strong> Our study shows low frequencies of<span> </span><span><span>long-distance</span></span><span> dispersal, which is unable to prevent inbreeding </span><span><span>in most of the local populations.</span></span><span> We discuss the significance for species conservation including future translocation events and </span><span><span>discuss</span></span><span> appropriate conservation strategies to maintain viable </span><span><span>grayling</span></span><span> (meta)p</span>opulations in highly fragmented, anthropogenic landscapes.</p>
Data from: Population genetic structure and long-distance dispersal among seabird populations: implications for colony persistence
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Data from: Occasional long-distance dispersal may not prevent inbreeding in a threatened butterfly
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Data from: Allometric scaling of long-distance seed dispersal by migratory birds
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Data from: The founding of Mauritian endemic coffee trees by a synchronous long-distance dispersal event
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Data from: Genetic uniformity and long-distance clonal dispersal in the invasive androgenetic Corbicula clams
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Data from: What is long-distance dispersal? and a taxonomy of dispersal events
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Data from: Occasional long-distance dispersal increases spatial synchrony of population cycles
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Phylogeny and biogeography of Acaena (Rosaceae) and its relatives: Evidence of multiple long-distance dispersal events across the globe
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Data from: Long-distance pollen and seed dispersal and inbreeding depression in Hymenaea stigonocarpa (Fabaceae: Caesalpinioideae) in the Brazilian savannah
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Fig. 4 in Systematics of Cuscuta chinensis species complex (subgenus Grammica, Convolvulaceae): evidence for long-distance dispersal and one new species
Fig. 4 Morphology of Cuscuta azteca. a Flower. b Outline of dissected calyx. c Dissected corolla showing infrastaminal scales (ifs). d Capsule. Bars 1 mm
Fig. 2 a–g in Systematics of Cuscuta chinensis species complex (subgenus Grammica, Convolvulaceae): evidence for long-distance dispersal and one new species
Fig. 2 a–g Scanning electron micrographs of multicellular protuberances on the calyx of Cuscuta chinensis species complex. a C. chinensis var. chinensis. b C. chinensis var. applanata. c–e C. alata. f
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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