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38 results for “migration strategies”
Population specific annual cycles and migration strategies in a leap-frog migrant
<p>A common migratory pattern in birds is that northerly breeding populations migrate to more southerly non-breeding sites compared to southerly: a pattern called <i>leap-frog </i>migration. Not only do populations experience differences in migration distances, but also different environmental conditions, which may vary spatiotemporally within their annual cycles, crating distinctive selective pressures and migratory behaviors. Information on how populations schedule their annual cycles according to environmental conditions and by extension, adapt their migratory behaviors is important to understand drivers of migration and evolution of migration patterns at large. Here we use light level geolocators and citizen science data on regional spring arrivals to compare two populations of common ringed plover <i>Charadrius hiaticula </i>– a textbook example of a leap-frog migrant – breeding at different latitudes. We 1) describe and characterize the spatiotemporal patterns of the annual cycles, and 2) test predictions regarding speed and timing of migration derived from the population specific characterizations of the annual cycles. Winter distributions followed a leap-frog migration pattern, i.e. northern breeding population (NBP) wintered in W Africa and the southern (SBP) mainly in W Europe. The annual cycles were shifted temporally so that the NBP was always later in all stages compared to the SBP. The SBP spent more than twice as long time in the breeding area, but there was no difference in winter residency. There was no difference in migration duration, nor migration speed, between the two seasons within population, but the NBP spent more time on migration in both seasons and migrated faster in spring compared to the SBP. We also found a larger variation in spring arrival times across years in the SBP. This suggests that a complex interaction of population specific timing and variation of breeding onset, length of breeding season and proximity to the breeding area shape the annual cycle and migratory behaviors.</p>
Host species traits rather than migration and molting strategies explain feather bacterial load in Palearctic passerines
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Towards the Migration from JavaScript to TypeScript: Strategies and Quality Assessment
<p>Data used for the paper: "Towards the Migration from JavaScript to TypeScript: Strategies and Quality Assessment"</p>
Prospective Validation of "Cholecystectomy First" Strategy for Gallstone Migration
ClinicalTrials.gov study NCT02461147. IPD Sharing: Not stated. Countries: 1. Publications: 3.
Data from: A hidden Markov model to identify and adjust for selection bias: an example involving mixed migration strategies
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Population specific annual cycles and migration strategies in a leap-frog migrant
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Data from: Habitat-mediated effects of diurnal and seasonal migration strategies on juvenile salmon survival
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Data from: Complex migration and breeding strategies in an elusive bird species illuminated by genetic and isotopic markers
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Data from: Migration strategies and annual space-use in an Afro-Palaearctic aerial insectivore – the European nightjar Caprimulgus europaeus
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Data from: Host migration strategy is shaped by forms of parasite transmission and infection cost
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Complex post-breeding moult strategies in a songbird migrating along the East Asian flyway, the Pallas’s Grasshopper Warbler Locustella certhiola
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Data from: Migration strategy affects avian influenza dynamics in mallards (Anas platyrhynchos)
Studies of pathogen transmission typically overlook that wildlife hosts can include both migrant and resident populations when attempting to model circulation. Through the application of stable isotopes in flight feathers, we estimated the migration strategy of mallards (Anas platyrhynchos) - resident, intermediate-distance migrant or long-distance migrant, occurring on California wintering grounds. Our study demonstrates that mallards, a principal host of avian influenza virus (AIV) in nature, contribute differently to virus gene flow depending on migration strategy. No difference in AIV prevalence was detected between resident (9.6%), intermediate-distance (9.6%) and long-distance migrants (7.4%). Viral diversity among the three groups was also comparable, possibly owing to viral pool mixing when birds converge at wetlands during winter. These findings challenge the view that migratory animals are exposed to a higher number and diversity of pathogens. However, migrants and residents contributed differently to the virus gene pool at wintering wetlands. Migrants introduced virus from northern breeding grounds (Alaska and the NW Pacific Rim) into the wintering population, facilitating gene flow at continental scales, but circulation of imported virus appeared to be limited. In contrast, resident mallards acted as AIV reservoirs facilitating year-round circulation of limited subtypes (i.e. H5N2) at lower latitudes. This study supports a model of virus exchange in temperate regions driven by the convergence of wild birds with separate geographic origins and exposure histories.
Data from: Adaptive strategies in nocturnally migrating insects and songbirds: contrasting responses to wind
1. Animals that use flight as their mode of transportation must cope with the fact that their migration and orientation performance is strongly affected by the flow of the medium they are moving in, i.e. by the winds. Different strategies can be used to mitigate the negative effects and benefit from the positive effects of a moving flow. The strategies an animal can use will be constrained by the relationship between the speed of the flow and the speed of the animal's own propulsion in relation to the surrounding air. 2. Here we analyse entomological and ornithological radar data from north-western Europe to investigate how two different nocturnal migrant taxa, the noctuid moth Autographa gamma and songbirds, deal with wind by analysing variation in resulting flight directions in relation to the wind-dependent angle between the animal's heading and track direction. 3. Our results, from fixed locations along the migratory journey, reveal different global strategies used by moths and songbirds during their migratory journeys. As expected, nocturnally migrating moths experienced a greater degree of wind drift than nocturnally migrating songbirds, but both groups were more affected by wind in autumn than in spring. 4. The songbirds' strategies involve elements of both drift and compensation, providing some benefits from wind in combination with destination and time control. In contrast, moths expose themselves to a significantly higher degree of drift in order to obtain strong wind assistance, surpassing the songbirds in mean ground speed, at the cost of a comparatively lower spatiotemporal migratory precision. 5. Moths and songbirds show contrasting but adaptive responses to migrating through a moving flow, which are fine-tuned to the respective flight capabilities of each group in relation to the wind currents they travel within.
Stopover use of a large estuarine wetland by dunlins during spring and autumn migrations: linking local refuelling conditions to migratory strategies
<p>1. Carbon and nitrogen stable isotope values measured in blood (plasma and red blood cells) and toenails of dunlins (<em>Calidris alpina</em>) captured at the Tagus estuary, Portugal, during spring and autumn migrations.</p> <p>2. Biometric and haematological parameters of dunlins (<em>Calidris alpina</em>) captured at the Tagus estuary, Portugal, during spring and autumn migrations.</p> <p>3. Biometric parameters and plasma metabolite concentrations of dunlins (<em>Calidris alpina</em>) captured at the Tagus estuary, Portugal, during spring and autumn migrations.</p>
Data from: Predator prey games in multiple habitats reveal mixed strategies in diel vertical migration
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Data from: Migration strategy and pathogen risk: non-breeding distribution drives malaria prevalence in migratory waders
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Data from: Adaptive strategies in nocturnally migrating insects and songbirds: contrasting responses to wind
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Data from: Migration strategy affects avian influenza dynamics in mallards (Anas platyrhynchos)
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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
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.