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59 results for “gene dispersal”
Data from: Limited gene dispersal and spatial genetic structure as stabilizing factors in an ant-plant mutualism
Comparative studies of the population genetics of closely associated species are necessary to properly understand the evolution of these relationships because gene flow between populations affects the partners' evolutionary potential at the local scale. As a consequence (at least for antagonistic interactions), asymmetries in the strength of the genetic structures of the partner populations can result in one partner having a co-evolutionary advantage. Here, we assess the population genetic structure of partners engaged in a species-specific and obligatory mutualism: the Neotropical ant-plant, Hirtella physophora, and its ant associate, Allomerus decemarticulatus. Although the ant cannot complete its life cycle elsewhere than on H. physophora and the plant cannot live for long without the protection provided by A. decemarticulatus, these species also have antagonistic interactions: the ants have been shown to benefit from castrating their host plant and the plant is able to retaliate against too virulent ant colonies. We found similar short dispersal distances for both partners, resulting in the local transmission of the association and, thus, inbred populations in which too virulent castrating ants face the risk of local extinction due to the absence of H. physophora offspring. On the other hand, we show that the plant populations probably experienced greater gene flow than did the ant populations, thus enhancing the evolutionary potential of the plants. We conclude that such levels of spatial structure in the partners' populations can increase the stability of the mutualistic relationship. Indeed, the local transmission of the association enables partial alignments of the partners' interests, and population connectivity allows the plant retaliation mechanisms to be locally adapted to the castration behaviour of their symbionts.
Candidate gene polymorphisms are linked to dispersive and migratory behaviour: searching for a mechanism behind the "paradox of the great speciators"
<p>The "paradox of the great speciators" has puzzled evolutionary biologists for over half a century. A great speciator requires excellent dispersal <span>propensity</span> to explain <span>its</span> occurrence on multiple islands, but reduced dispersal ability to explain <span>its</span> high number of subspecies. A rapid reduction in dispersal ability is often invoked to solve this apparent paradox, but a proximate mechanism has not been identified yet. Here, we explored the role of six genes linked to migration and animal personality differences (<em>CREB1, CLOCK, ADCYAP1, NPAS2, DRD4, </em>and<em> SERT</em>) in 20 South Pacific populations of silvereye (<em>Zosterops</em> <em>lateralis</em>) that range from highly sedentary to partially migratory, to determine if genetic variation is associated with dispersal propensity and migration. We detected genetic associations in three of the six genes: i) in a partial migrant population, migrant individuals had longer microsatellite alleles at the <em>CLOCK</em> gene compared to resident individuals from the same population; ii) <em>CREB1</em> displayed longer average microsatellite allele lengths in recently colonised island populations (< 200 years), compared to evolutionarily older populations. Bayesian broken stick regression models supported a reduction in <em>CREB1</em> length with time since colonisation; and iii) like <em>CREB1</em>, <em>DRD4</em> showed differences in polymorphisms between recent and old colonisations but a <span>larger</span> sample is needed to confirm. <em>ADCYAP1</em>, <em>SERT</em>, and <em>NPAS2</em> were variable but that variation was not associated with dispersal propensity. The association of genetic variants at three genes with migration <span>and</span> dispersal ability in silvereyes provides the impetus for further exploration of genetic mechanisms underlying dispersal shifts and the prospect of resolving a long-running evolutionary paradox through a genetic lens.</p>
Restricted dispersal in a sea of gene flow
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Data from: Gene flow by larval dispersal in the Antarctic notothenioid fish Gobionotothen gibberifrons
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Data from: Extremely reduced dispersal and gene flow in an island bird
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Data from: Limited gene dispersal and spatial genetic structure as stabilizing factors in an ant-plant mutualism
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Data from: Fire-induced population reduction and landscape opening increases gene flow via pollen dispersal in Pinus halepensis
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Data from: Maintaining genetic diversity and population panmixia through dispersal and not gene flow in a holocyclic heteroecious aphid species
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Data from: When genes move farther than offspring: gene flow by male gamete dispersal in the highly philopatric bat species Thyroptera tricolor
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Data from: Estimating the molecular evolutionary rates of mitochondrial genes referring to Quaternary Ice Age events with inferred population expansions and dispersals in Japanese Apodemus
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Data from: Walking in a heterogeneous landscape: dispersal, gene-flow and conservation implications for the giant panda in the Qinling Mountains
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Candidate gene polymorphisms are linked to dispersive and migratory behaviour: searching for a mechanism behind the “paradox of the great speciators”
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Data from: Is dispersal guided by the environment? A comparison of interspecific gene flow estimates among differentiated regions of a newt hybrid zone.
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Data from: Asymmetric contributions of seed and pollen to gene dispersal in the marsh orchid Dactylorhiza umbrosa in Asia Minor
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Data from: Low plant density enhances gene dispersal in the Amazonian understory herb Heliconia acuminata
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Data from: Fragmentation of Atlantic Forest has not affected gene flow of a widespread seed-dispersing bat
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Data from: Estimates of gene flow and dispersal in wild riverine Brook Trout (Salvelinus fontinalis) populations reveal ongoing migration and introgression from stocked fish
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Data from: Habitat discontinuities form strong barriers to gene flow among mangrove populations, despite the capacity for long distance dispersal
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Data from: Return of the ghosts of dispersal past: historical spread and contemporary gene flow in the blue sea star Linckia laevigata
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Data from: Landscape permeability and individual variation in a dispersal-linked gene jointly determine genetic structure in the Glanville fritillary butterfly
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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.