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36 results for “Anas platyrhynchos”
Fig. 7 in Threat of cercarial dermatitis in Hungary: A first report of Trichobilharzia franki from the mallard (Anas platyrhynchos) and European ear snail (Radix auricularia) using molecular methods
Fig. 7. Ocellata-type of furcocercaria emerged from Radix auricularia.
Shortgrass Steppe site, station USGS Breeding Bird Survey Route 17305, Nunn, CO, study of animal abundance of Anas platyrhynchos in units of numberPerSightingEffort on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Shortgrass Steppe (SGS) contains animal abundance of Anas platyrhynchos measurements in numberPerSightingEffort units and were aggregated to a yearly timescale.
Data from: Lincoln estimates of mallard (Anas platyrhynchos) abundance in North America
Estimates of range-wide abundance, harvest, and harvest rate are fundamental for sound inferences about the role of exploitation in the dynamics of free-ranging wildlife populations, but reliability of existing survey methods for abundance estimation is rarely assessed using alternative approaches. North American mallard populations have been surveyed each spring since 1955 using internationally coordinated aerial surveys, but population size can also be estimated with Lincoln's method using banding and harvest data. We estimated late summer population size of adult and juvenile male and female mallards in western, midcontinent, and eastern North America using Lincoln's method of dividing (i) total estimated harvest, H, by estimated harvest rate, h, calculated as (ii) direct band recovery rate, f, divided by the (iii) band reporting rate, p. Our goal was to compare estimates based on Lincoln's method with traditional estimates based on aerial surveys. Lincoln estimates of adult males and females alive in the period June–September were 4.0 (range: 2.5–5.9), 1.8 (range: 0.6–3.0), and 1.8 (range: 1.3–2.7) times larger than respective aerial survey estimates for the western, midcontinent, and eastern mallard populations, and the two population estimates were only modestly correlated with each other (western: r = 0.70, 1993–2011; midcontinent: r = 0.54, 1961–2011; eastern: r = 0.50, 1993–2011). Higher Lincoln estimates are predictable given that the geographic scope of inference from Lincoln estimates is the entire population range, whereas sampling frames for aerial surveys are incomplete. Although each estimation method has a number of important potential biases, our review suggests that underestimation of total population size by aerial surveys is the most likely explanation. In addition to providing measures of total abundance, Lincoln's method provides estimates of fecundity and population sex ratio and could be used in integrated population models to provide greater insights about population dynamics and management of North American mallards and most other harvested species.
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: Admixture between released and wild game birds: a changing genetic landscape in European mallards (Anas platyrhynchos)
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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.
Fig. 3 in Morphometric Analysis Of Сapillaria Anatis (Nematoda, Capillariidae) From Anas Platyrhynchos Domesticus
Fig. 3. Tail end of Ơ Сapillaria anatis: а — general view; b — laterally; с — dorsally; d — proximal end of spicule; Pb — pseudobursa, Ll — lateral lobes, Sh — spicule sheath with small spikes, S — spicule, Ds — distal end of spicule.
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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Comparative analysis of Tsaiya duck (Anas platyrhynchos) transcriptional profiling between high and low hatchability
GEO Series GSE23100. Anas platyrhynchos. 4 samples. Type: Expression profiling by array.
Expression profiling of skeletal muscle in two breeds of duck (Anas platyrhynchos)
GEO Series GSE65628. Anas platyrhynchos. 4 samples. Type: Expression profiling by high throughput sequencing.
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Allen Brain Atlas
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