Baltimore Oriole (Icterus galbula) Science Article 2 abstract Of all our beautiful summer residents the Baltimore Oriole (Zcterus galbula) is the most handsome. This statement applies to both form and coloration. Migration records covering twelve years show that these birds come to southern Iowa on dates ranging from April 26 to May 6, and that […]
Category: Passeriformes
VARIACION DEL HEMATOCRITO DURANTE EL PERIODOREPRODUCTOR EN EL RABILARGO CYANOPICA CYANUS
Azure-winged Magpie (Cyanopica cyanus) Science Article 3 abstract Changes in the haematocrit in Azure-winged Magpies Cyanopica cyanus during the reproductiveperiod. Previous studies have suggested that the haematocrit could be related to a number of factors within the birds’ biological cycle. In this study, the variation found in the haematocrit of Azure-winged Magpies Cyanopica cyanus during […]
Testosterone and helping behavior in the azure-winged magpie(Cyanopica cyanus): natural covariation and an experimental test
Azure-winged Magpie (Cyanopica cyanus) Science Article 2 abstract In this study, we investigated patterns of natural covariation between testosterone and reproductive status in a cooperatively breeding bird species, the azurewinged magpie (Cyanopica cyanus). To assess the relationship between testosterone and breeding behavior,we also manipulated testosterone (T) levels early in the season (before breeding started) using […]
Synchronic east
Azure-winged Magpie (Cyanopica cyanus) Science Article 4 abstract Morphometric and genetic analyses were performed to investigate the relationships between populations of the azure-winged magpie (Cyanopica cyanus). In the morphometric analysis 193 specimens were included representing seven of the nine currently accepted subspecies. Among eight characters analysed, four showed significant differences between samples from Spain and […]
Notes on Phyhoseopus coronatus iiimae
Arctic Warbler (Phylloscopus borealis) Science Article 1 abstract Three of these little-known Willow Warblers were taken in the southern part of Okinawa Shims, Riu KM Islands, in the fall of 1945. Unfortunately, two were lost subsequently, but in view of the bird’s rarity, it seems worth while to place on record the notes that were […]
Breeding Ecology and Habitat Associationsof the Arctic Warbler in Interior Alaska
Arctic Warbler (Phylloscopus borealis) Science Article 2 abstract The Alaska Bird Observatory (ABO) initiated a three-year study in May 2004 to describe the breeding biology and habitat associations of Arctic Warblers (Phylloscopus borealis kennecotti) along the Denali Highway (Milepost 23-34) between Tangle Lakes and Maclaren Summit. Richard Ring, Susan Sharbaugh, and Nancy Dewitt, Alaska Bird […]
Offspring sex ratio variation in relation to brood sizeand mortality in a promiscuous species: the AquaticWarblerAcrocephalus paludicola
Aquatic Warbler (Acrocephalus paludicola) Science Article 15 abstract We analyse nestling sex ratio variation in the Aquatic WarblerAcrocephalus paludicolato testfor predictions from sex allocation theory that the brood sex ratio is close to parity. We alsotested Fiala’s (1980) prediction that there is no difference in sex ratio between broodsaffected and not affected by mortality, and […]
Identifying autumn migration routes for the globallythreatened Aquatic WarblerAcrocephalus paludicola
Aquatic Warbler (Acrocephalus paludicola) Science Article 3 abstract The migration strategy of the globally threatened Aquatic WarblerAcrocephalus paludicolaneeds to be known to ensure that effective action is taken to conserve its principal stopoversites. R. JULLIARD et al, Ibis(2006), 148, 735-743 Download article download full text (pdf)
Die aktuelle Situation des SeggenrohrsangersAcrocephalus paludicola in Deutschland
Aquatic Warbler (Acrocephalus paludicola) Science Article 12 abstract During the 20th century the Aquatic Warbler lost nearly all its breeding sites in Germanydue to drainage of fen mires, land reclamation and intensified agriculture. ANGELA HELMECKE et al, Ber. Vogelschutz 40 (2003): 81-89 Download article download full text (pdf)
Notes on the Hoary Redpoll on its central Canadian Arctic breeding grounds
Arctic Redpoll (Carduelis hornemanni) Science Article 1 abstract G. Ron Austing and I made the following observations of the Hoary Redpoll (Acanthis hornemanni) during the period of 30 June to 15 July 1972 while photographing birds around Bathurst Inlet Lodge at the mouth of the Burnside River on Bathurst Inlet (66′ 50′ N., 108′ 02′ […]