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62 results for “mallard”
Data from: Idenitfying hybrids & the genomics of hybridization: mallards & American black ducks of Eastern North America
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Hourly GPS location data from mallards (Anas platyrhynchos), green-winged teal (Anas crecca), and American wigeon (Mareca americana) transmittered in Arkansas
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Data from: Transfer of maternal antibodies against avian influenza virus in mallards (Anas platyrhynchos)
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Data from: ddRAD‐seq data reveal significant genome‐wide population structure and divergent genomic regions that distinguish the mallard and close relatives in North America
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Data from: Endozoochory of aquatic ferns and angiosperms by mallards in Central Europe
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Data from: Admixture between released and wild game birds: a changing genetic landscape in European mallards (Anas platyrhynchos)
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Persistence of an endangered native duck, feral mallards, and multiple hybrid swarms across the main Hawaiian Islands
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Data from: Lincoln estimates of mallard (Anas platyrhynchos) abundance in North America
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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: Eggshell coloration reflects both yolk characteristics and dietary carotenoid history of female mallards
1. Avian eggshell coloration has frequently been examined in a functional context (e.g. mimicry, camouflage), but in recent years, an interest has emerged in identifying the mechanisms that drive eggshell colour variation. 2. Eggshell coloration is predominately caused by pigment deposition; one such pigment is the antioxidant biliverdin, and deposition of biliverdin into eggshells may be costly to mothers due to depletion of their antioxidant reserves. Previous work has shown that dietary supplementation during laying with another type of antioxidant – carotenoid pigments – induces females to produce more biliverdin-rich eggshells. However, the impact of pre-laying nutrition – including the developmental period early in life – on eggshell coloration has not been investigated. 3. Here, we raised female mallards (Anas platyrhynchos) from hatching, supplemented their diets with carotenoids during early-, mid- or late-developmental periods, and at adulthood measured female circulating carotenoid levels, yolk carotenoid levels, and eggshell coloration. We found that carotenoid supplementation during the late stages of development (transitional period from juvenile to adult plumage) promoted the laying of eggs with more biliverdin-rich eggshells. Independent of developmental dietary treatment, females with higher circulating carotenoid levels at the time of egg laying produced more biliverdin-rich eggshells and more carotenoid-rich yolks. When controlling for female identity, we found that more biliverdin-rich eggshells were associated with more carotenoid-rich, but smaller, yolks. We also detected a laying order effect; later-laid eggs had larger, less carotenoid-rich yolks and less biliverdin-rich eggshells. 4. Taken together, these results demonstrate that eggshell coloration reveals carotenoid status of both mothers and yolks and that diet quality more than 1 month prior to laying can affect eggshell coloration in a waterfowl species. As mallards are considered to be capital breeders in terms of lipid stores, our findings provide a new developmental perspective on the carryover of lipid-soluble and antioxidant nutrient reserves for breeding.
Data from: Vocal plasticity in mallards: multiple signal changes in noise and the evolution of the Lombard effect in birds
Signal plasticity is a building block of complex animal communication systems. A particular form of signal plasticity is the Lombard effect, in which a signaler increases its vocal amplitude in response to an increase in the background noise. The Lombard effect is a basic mechanism for communication in noise that is well-studied in human speech and which has also been reported in other mammals and several bird species. Sometimes, but not always, the Lombard effect is accompanied by additional changes in signal parameters. However, the evolution of the Lombard effect and other related vocal adjustments in birds are still unclear because so far only three major avian clades have been studied. We report the first evidence for the Lombard effect in an anseriform bird, the mallard (Anas platyrhynchos). In association with the Lombard effect, the fifteen ducklings in our experiment also increased the peak frequency of their calls in noise. However, they did not change the duration of call syllables or their call rates as has been found in other bird species. Our findings support the notion that all extant birds use the Lombard effect to solve the common problem of maintaining communication in noise, i.e. it is an ancestral trait shared among all living avian taxa, which means that it has evolved more than 70 million years ago within that group. At the same time, our data suggest that parameter changes associated with the Lombard effect follow more complex patterns, with marked differences between taxa, some of which might be related to proximate constraints..
Data from: Speciation genomics and a role for the Z chromosome in the early stages of divergence between Mexican ducks and mallards
Speciation is a continuous and dynamic process, and studying organisms during the early stages of this process can aid in identifying speciation mechanisms. The mallard (Anas platyrhynchos) and Mexican duck (A. [p.] diazi) are two recently diverged taxa with a history of hybridization and controversial taxonomy. To understand their evolutionary history, we conducted genomic scans to characterize patterns of genetic diversity and divergence across the mitochondrial DNA (mtDNA) control region, 3523 autosomal loci and 172 Z-linked sex chromosome loci. Between the two taxa, Z-linked loci (ΦST = 0.088) were 5.2 times more differentiated than autosomal DNA (ΦST = 0.017) but comparable to mtDNA (ΦST = 0.092). This elevated Z differentiation deviated from neutral expectations inferred from simulated data that incorporated demographic history and differences in effective population sizes between marker types. Furthermore, 3% of Z-linked loci, compared to <0.1% of autosomal loci, were detected as outlier loci under divergent selection with elevated relative (ΦST) and absolute (dXY) estimates of divergence. In contrast, the ratio of Z-linked and autosomal differentiation among the seven Mexican duck sampling locations was close to 1:1 (ΦST = 0.018 for both markers). We conclude that between mallards and Mexican ducks, divergence at autosomal markers is largely neutral, whereas greater divergence on the Z chromosome (or some portions thereof) is likely the product of selection that has been important in speciation. Our results contribute to a growing body of literature indicating elevated divergence on the Z chromosome and its likely importance in avian speciation.
Fig. 2 in Helminths Of The Mallard, Anas Platyrhynchos (Aves, Anatidae) In Ukraine: Analysis Of The Diversity In Mixed Forest Zone And The Black Sea Region
Fig. 2. Prevalence (with lower and upper confidence intervals at significant level 95 %) and average intensity (with range; in case when one or two birds were infected by a certain type of helminth, then the actual intensity values are given) of Mallard´s infection with: A — cestodes from the mixed forest zone; B — cestodes from the steppe zone; C — nematodes and acanthocephalans from the mixed forest zone; D — nematodes and acanthocephalans from the steppe zone.* Logarithmic scale was used.
Figure 2 in Ontogeny of Chenophila platyrhynchos sp. nov. (Acari: Syringophilidae), an ectoparasite of the Mallard Anas platyrhynchos (Anseriformes: Anatidae)
Figure 2. Chenophila platyrhynchos sp. nov., male: A) dorsal view, B) ventral view, C) gnathosoma in dorsal view, D) gnathosoma in ventral view, E) peritremes, and F) genito-anal region.
Figure 1 in Ontogeny of Chenophila platyrhynchos sp. nov. (Acari: Syringophilidae), an ectoparasite of the Mallard Anas platyrhynchos (Anseriformes: Anatidae)
Figure 1. Chenophila platyrhynchos sp. nov., female: A) dorsal view, B) ventral view, C) gnathosoma in dorsal view, D) gnathosoma in ventral view, E) peritremes, F) fan-like seta p'III, G) solenidia of leg I.
Figure 5 in Ontogeny of Chenophila platyrhynchos sp. nov. (Acari: Syringophilidae), an ectoparasite of the Mallard Anas platyrhynchos (Anseriformes: Anatidae)
Figure 5. Chenophila platyrhynchos sp. nov.: A) egg; larva: B) dorsal view, C) ventral view, D) gnathosoma in dorsal view, E) gnathosoma in ventral view, F) tarsus I in dorsal view, G) peritremes.
Data from: Migration strategy affects avian influenza dynamics in mallards (Anas platyrhynchos)
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Data from: Speciation genomics and a role for the Z chromosome in the early stages of divergence between Mexican ducks and mallards
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Data from: Vocal plasticity in mallards: multiple signal changes in noise and the evolution of the Lombard effect in birds
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Data from: Eggshell coloration reflects both yolk characteristics and dietary carotenoid history of female mallards
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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)
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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.