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6 results for “Anas crecca crecca”
Рис. 2. ВоΔопΛавающие и окоΛовоΔные виΔы птиц на берегах Ямуны: 1 — Anas crecca, Himantopus himantopus; 2 — Ardea alba, Egretta garzetta, Ardeola grayii; 3 — Himantopus himantopus; 4 — Himantopus himantopus, Recurvirostra avosetta; 5 — Phalacrocorax niger, Amaurornis phoenicurus; 6 — Platalea leucorodia, Mycteria leucocephala; 7 — Ardea cinerea; 8 — Anas poecilorhyncha Fig. 2. Waterfowl and shorebird species on the Yamuna River: 1 — Anas crecca, Himantopus himantopus; 2 — Ardea alba, Egretta garzetta, Ardeola grayii; 3 — Himantopus himantopus; 4 — Himantopus himantopus, Recurvirostra avosetta; 5 — Phalacrocorax niger, Amaurornis phoenicurus; 6 — Platalea leucorodia, Mycteria leucocephala; 7 — Ardea cinerea; 8 — Anas poecilorhyncha in Aggregation of the wintering birds on the Yamuna River in India
Рис. 2. ВоΔопΛавающие и окоΛовоΔные виΔы птиц на берегах Ямуны: 1 — Anas crecca, Himantopus himantopus; 2 — Ardea alba, Egretta garzetta, Ardeola grayii; 3 — Himantopus himantopus; 4 — Himantopus himantopus, Recurvirostra avosetta; 5 — Phalacrocorax niger, Amaurornis phoenicurus; 6 — Platalea leucorodia, Mycteria leucocephala; 7 — Ardea cinerea; 8 — Anas poecilorhyncha Fig. 2. Waterfowl and shorebird species on the Yamuna River: 1 — Anas crecca, Himantopus himantopus; 2 — Ardea alba, Egretta garzetta, Ardeola grayii; 3 — Himantopus himantopus; 4 — Himantopus himantopus, Recurvirostra avosetta; 5 — Phalacrocorax niger, Amaurornis phoenicurus; 6 — Platalea leucorodia, Mycteria leucocephala; 7 — Ardea cinerea; 8 — Anas poecilorhyncha
Shortgrass Steppe site, station USGS Breeding Bird Survey Route 17305, Nunn, CO, study of animal abundance of Anas crecca 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 crecca measurements in numberPerSightingEffort units and were aggregated to a yearly timescale.
Data from: A parapatric propensity for breeding precludes the completion of speciation in common teal (Anas crecca, sensu lato)
Speciation is a process in which genetic drift and selection cause divergence over tSpeciation is a process in which genetic drift and selection cause divergence over time. However, there is no rule dictating the time required for speciation, and even low levels of gene flow hinder divergence, so that taxa may be poised at the threshold of speciation for long periods of evolutionary time. We sequenced mitochondrial DNA (mtDNA) and eight nuclear introns (nuDNA) to estimate genomic levels of differentiation and gene flow between the Eurasian common teal (Anas crecca crecca) and the North American green-winged teal (A. c. carolinensis). These ducks come into contact in Beringia (northeastern Asia and northwestern North America) and have likely done so, perhaps cyclically, since the Pliocene-Pleistocene transition, ~2.6 Ma, when they apparently began diverging. They have diagnosable differences in male plumage and are 6.9% divergent in the mtDNA control region, with only 1 of 58 crecca and 2 of 86 carolinensis having haplotypes grouping with the other. Two nuclear loci were likewise strongly structured between these teal (ΦST > 0.35), but six loci were undifferentiated or only weakly structured (ΦST = 0.0–0.06). Gene flow between crecca and carolinensis was ~1 individual per generation in both directions in mtDNA, but was asymmetrical in nuDNA, with ~1 and ~20 individuals per generation immigrating into crecca and carolinensis, respectively. This study illustrates that species delimitation using a single marker oversimplifies the complexity of the speciation process, and it suggests that even with divergent selection, moderate levels of gene flow may stall the speciation process short of completion.
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: A parapatric propensity for breeding precludes the completion of speciation in common teal (Anas crecca, sensu lato)
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Data from: Heteropatric speciation in a duck, Anas crecca
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