Willow Ptarmigan (Lagopus lagopus) Science Article 12 abstract Sympatric populations of tetraonid birds tend to fluctuate in synchrony, at least onlocal scales. If shared parasites among sympatric populations of different tetraonidspecies are to operate as a local, synchronizing factor for population fluctuations atleast two conditions should be met Per R. Holmstad, Peter J. Hudson, Vigdis […]
OFFSHORE MARINE OBSERVATION OF WILLOW PTARMIGAN,INCLUDING WATER LANDINGS, KUSKOKWIM BAY, ALASKA
Willow Ptarmigan (Lagopus lagopus) Science Article 10 abstract We report an observation of Willow Ptarmigan (Lagopus lagopus) encountered 8 to 17 kmfrom the nearest shoreline on Kuskokwim Bay, Alaska, on 30 August 2003. The ptarmigan were observed flying,landing on our research vessel, and landing and taking off from the water surface CHRISTIAN E. ZIMMERMAN et […]
Re-mating in migratory Wigeon Anas penelope
Wigeon (Anas penelope) Science Article 4 abstract This note describes re-mating in migratory Wigeon Anas penelope in subsequent winters. Three pairs, out of five cases where both male and female partners returned to the study area, reformed in the following winter. Mitchell C., ARDEA 85 (2): 275-277. Download article download full text (pdf)
Constraints of feeding on Salicornia ramosissimaby wigeonAnas penelope: an experimental approach
Wigeon (Anas penelope) Science Article 1 abstract The coastal marshes of the Charente-Maritime (western France) are a major wintering area for wigeon Anas penelope. In these marshes, wigeon feed mainly on grasses, while foraging on Salicornia (a .eshy, succulent halophyte) is uncommon. In order to understand the reason for this under-exploitation, an experimental study was […]
Feeding behaviour of breeding Wigeon Anas penelope in relation to seasonal emergence and swarming behaviour of chironomids.
Wigeon (Anas penelope) Science Article 3 abstract Emergence of chironomids started in mid-April, and reached a peak at the end of April and in the beginning of May. Most ‘spring’ chironomids emerged around noon, whereas the majority of chironomids emerging later in the season, appeared at night. In general, there was a positive correlation between […]
Variation of pecking rate with sward height in wild wigeon Anas penelope
Wigeon (Anas penelope) Science Article 2 abstract We examined how pecking rate changed with sward height in wintering European wigeon Anas penelope in a nature reserve of the French Atlantic coast. Pecking rates were recorded as the time taken to perform 10 or 50 pecks. We found a negative correlation between pecking rate and sward […]
Tanagra minuta, an addition to the Mexican list
White-winged Becard (Pachyramphus polychopterus) Science Article 2 abstract While examining bird skins in the collection of the Moore Laboratory of Zoology, Phillips found in a series of T.affinis a previously undetected specimen of the White-vented Euphonia T. minuta Cabanis. The specimen, apparently an adult male: is labeled Palenque, Chiapas, altitude 210 m, 9 May 1946, […]
Bill deformity in a White-winged Becard, Pachyramphus polychopterus,(Aves: Suboscines: Tityridae) from Minas Gerais, Brazil
White-winged Becard (Pachyramphus polychopterus) Science Article 1 abstract Bill deformities have been recorded for several bird species around the world. Craves (1994) presented a revision on bill deformities in passerines (Aves: Passeres), which was updated by the Rouge River Bird Observatory (University of Michigan-Dearborn 2004). Bill abnormalities are known to occur in low frequency in […]
A flight-song display of White-throated Manakin
White-throated Manakin (Corapipo gutturalis) Science Article 1 abstract White-throated Manakin (Corapipo gutturalis) is known in northeastern South America from the Guianas, Venezuela, and northern Brazil (de Schauensee, The Species of Birds of South America, Livingston, Wynnewood, Pennsylvania, 1966). The species favors hilly forest in Venezuela, between 250 and 1100 m elevation (de Schauensee et al., […]
Biometric differences among the Dipper Cinclus cinclus populations ofSpain
White-throated Dipper (Cinclus cinclus) Science Article 4 abstract The length of the tarsus and wing, and the weight of the Dipper were measured in four mountain ranges inSpain (Cantabrian Mountains, western Pyrenees, the Central Mountains and Sierra Nevada). Francisco CAMPOS et al, ACTA ORNITHOLOGICA Vol. 40 (2005) No. 2 Download article download full text (pdf)