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23 results for “Passerine migration”
Fig. 1 in Infestation With Ixodes Ricinus Ticks On Migrating Passerine Birds In Lithuania And Norway
Fig. 1 Molecular taxonomical identification of the I. ricinus by PCR assay. Lines 1 and 15 – 50 bp marker; Line 2 –negative control; Lines 2-13 –positive results: amplified 150 bp specific fragment for I. ricinus; Line 14 – positive control of I. ricinus (150 bp)
Logger data for article "Effects of blood parasite infections on spatiotemporal migration patterns and activity budgets in a long-distance migratory passerine"
<p>The supplement loggerDATA.zip is a ZIP Archive (to be unzipped e.g. with <a href="https://www.izarc.org/downloads">https://www.izarc.org/downloads</a>) containing 40 folders and one .txt file. In the readME.txt file one can find a detailed description of the folder content and the data specifications of the files used for the analyses in the article "Effects of blood parasite infections on spatiotemporal migration patterns and activity budgets in a long-distance migratory passerine".</p> <p>For more information of how the data can be analysed and visualised please see: <a href="https://kiranlda.github.io/PAMLrManual/">https://kiranlda.github.io/PAMLrManual/</a>.</p>
Migration variables and infection data for article "Effects of blood parasite infections on spatiotemporal migration patterns and activity budgets in a long-distance migratory passerine"
<p>Data related to the article "Effects of blood parasite infections on spatiotemporal migration patterns and activity budgets in a long-distance migratory passerine" in the format .csv. The 1st file (SupplTab_EcoEvo_data.csv) contains all variables used for the analyses and the 2nd file (SupplTab_EcoEvo_glossary.csv) contains explanations about the variables in the 1st file.</p>
Data from: Mechanical and structural adaptations to migration in the flight feathers of a Palaearctic passerine
<p>Current avian migration patterns in temperate regions have been developed during the glacial retreat and subsequent colonization of the ice-free areas during the Holocene. This process resulted in a geographic gradient of greater seasonality as latitude increased that favoured migration-related morphological and physiological (co)adaptations. Most evidence of avian morphological adaptations to migration comes from the analysis of variation in the length and shape of the wings, but the existence of intra-feather structural adjustments has been greatly overlooked despite their potential to be under natural selection. To shed some light on this question, we used data from European robins Erithacus rubecula overwintering in Campo de Gibraltar (Southern Iberia), where sedentary robins coexist during winter with conspecifics showing a broad range of breeding origins and, hence, migration distances. We explicitly explored how wing length and shape, as well as several functional (bending stiffness), developmental (feather growth rate) and structural (size and complexity of feather components) characteristics of flight feathers varied in relation to migration distance, which was estimated from the hydrogen stable isotope ratios of the summer-produced tail feathers. Our results revealed that migration distance not only favoured longer and more concave wings, but also promoted primaries with a thicker dorsoventral rachis and shorter barb lengths, which in turn conferred more bending stiffness to these feathers. We suggest that these intra-feather structural adjustments could be an additional, largely unnoticed, adaptation within the avian migratory syndrome that might have the potential to evolve relatively quickly to facilitate the occupation of seasonal environments.</p>
Fig. 2 in Infestation With Ixodes Ricinus Ticks On Migrating Passerine Birds In Lithuania And Norway
Fig. 2 Larval and nymphal infestation rates of passerine migratory birds in Norway and Lithuania
Fig. 2 in Fuel Load And Flight Range Estimation Of Migrating Passerines In The Western Part Of The Carpathian Basin During The Autumn Migration
Fig. 2. Potential flight ranges (+ SE) of passerine species stopping over in Tömörd during
Fig. 1 in Fuel Load And Flight Range Estimation Of Migrating Passerines In The Western Part Of The Carpathian Basin During The Autumn Migration
Fig. 1. Potential Mediterranean flyway in southern Europe (arrows) and the location of Tömörd
Data from: Mechanical and structural adaptations to migration in the flight feathers of a Palaearctic passerine
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Winter connectivity and leapfrog migration in a migratory passerine
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Data from: Causes and consequences of partial migration in a passerine bird
Many animal species have populations in which some individuals migrate and others remain on the breeding grounds. This phenomenon is called partial migration. Despite substantial theoretical work, empirical data on causes and consequences of partial migration remain scarce, mainly because of difficulties associated with tracking individuals over large spatial scales. We used stable hydrogen isotopes in claw material to determine whether skylarks Alauda arvensis from a single breeding population in the Netherlands had migrated or remained resident in the previous winter and investigated whether there were causes or consequences of either strategy. Age and sex had no influence on the propensity to migrate, but larger individuals were more likely to be residents. The wintering strategy was not fixed within individuals. Up to 45% of individuals measured in multiple years switched strategies. Reproductive parameters were not related to the wintering strategy, but individuals that wintered locally experienced lower future return rates, and this was directly correlated with two independent measures of immune function. Our results suggest that partial migration in skylarks is based neither on genetic dimorphism nor on an age- and sex-dependent condition. Instead, the wintering strategy is related to structural size and immune function. These new insights on causes and consequences of partial migration advance our understanding of the ecology, evolution, and coexistence of different life-history strategies.
Host species traits rather than migration and molting strategies explain feather bacterial load in Palearctic passerines
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Data from: A tale of two seasons: the link between seasonal migration and climatic niches in passerine birds.
<p class="MsoCommentText">The question of whether migratory birds track a specific climatic niche by seasonal movements has important implications for understanding the evolution of migration, the factors affecting species' distributions and the responses of migrants to climate change. Despite much research, previous studies of bird migration have produced mixed results. However, whether migrants track climate is only one half of the question, the other being why residents remain in the same geographic range year-round. We provide a literature overview and test the hypothesis of seasonal niche tracking by evaluating seasonal climatic niche overlap across 437 migratory and resident species from eight clades of passerine birds. Seasonal climatic niches were based on a new global dataset of breeding and non-breeding ranges. Overlap between climatic niches was quantified using ordination methods. We compared niche overlap of migratory species to two null expectations, 1) a scenario in which they do not migrate and 2) in comparison to the overlap experienced by closely related resident species, while controlling for breeding location and range size. Partly in accordance with the hypothesis of niche tracking, we found that the overlap of breeding vs. non-breeding climatic conditions in migratory species was greater than the overlap they would experience if they did not migrate. However, this was only true for migrants breeding outside the tropics and only relative to the overlap species would experience if they stayed in the breeding range year-round. In contrast to the hypothesis of niche tracking, migratory species experienced lower seasonal climatic niche overlap than resident species, with significant differences between tropical and non-tropical species. Our study suggests that in seasonal non-tropical environments migration away from the breeding range may serve to avoid seasonally harsh climate; however, different factors may drive seasonal movements in the climatically more stable tropical regions.</p>
Optimal Stopover Model: a state dependent habitat selection model for staging passerines during migration
<p>1. During their seasonal migration, birds stage in areas comprising stopover sites of varying quality. Given that migrating birds have a limited information about their environments, they may land at a low-quality stopover site in which their fuel deposition rate (FDR) is low. Birds landing at such sites, should decide either to extend their stopover duration or to quickly depart in search for a better site. These decisions, however, strongly depend on their body condition upon landing.</p> <p>2. To understand the decision-making process of passerines within a stopover area, comprising stopover sites of varying quality, prior to the crossing of a large ecological barrier, we constructed a state-dependent habitat selection model. The model assumes that even if migrating birds have an expectation of encountered area quality, they cannot control for their initial landing site. Once landing, movement between a low to high quality stopover site will occur only if the body condition of these birds is high to the extent that they can entail the energetic cost of movement. Birds in the model aim to maximize their fuel load at the end of the stopover period, to suffice for successfully crossing a large ecological barrier.</p> <p>3. The model is based on empirical data on autumn migrating Blackcaps (Sylvia atricapilla), collected at two important stopover sites in the Negev desert of Israel. Migrating passerines staging at these two sites differ in their fuel deposition rate and body condition. The model shows that the optimal behavior when arriving at a low-quality stopover site is to abandon it quickly. However, as lean individuals cannot entail the costs of searching for an alternative site, they have no other choice but to stay there even if their chances to successfully cross the Sahara Desert ahead are low.</p> <p>4. Our model can be applied to other ecological systems. Proper use of this model may allow good assessment of stopover site quality, as indicated by the bird's fuel deposition rate, regardless of specific site characteristics. Hence it can help applying targeted management decisions regarding the maintenance of stopover sites or establishment of new ones.</p>
Optimal Stopover Model: a state dependent habitat selection model for staging passerines during migration
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Data from: Causes and consequences of partial migration in a passerine bird
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Data from: Carry-over effects of winter habitat quality on en route timing and condition of a migratory passerine during spring migration
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Evolution of altitudinal migration in passerines is linked to diet
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Data from: Comparative analysis of the plasma metabolome of migrating passerines: Novel insights into stopover metabolism
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Data from: A tale of two seasons: the link between seasonal migration and climatic niches in passerine birds.
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Evolution of moult-migration is directly linked to aridity of the breeding grounds in North American passerines
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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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