Sedge Warbler (Acrocephalus schoenobaenus) Science Article 6 abstract During migration, many species of birds rely onstored fat for fuel. The extra mass taken on for migrationentails costs (Witter and Cuthill 1993). Timeand energy must be devoted to foraging to build upfat loads, and increased feeding may increase therisk of being attacked by predators. An additionalcost […]
Does tape-luring of migrating eurasian reed-warblers increase number of recruits or capture probability?
Sedge Warbler (Acrocephalus schoenobaenus) Science Article 3 abstract Tape-luring often is used in studies of bird migration, and the technique can strongly augment the total number of birds captured. Additional captures from tape-luring could result from increasing the capture probability of birds already at the stopover site, or from attracting birds that normally would have […]
Distribution, density, diet and productivity of the Scops Owl Otus scops in the Italian Alps
Scops-Owl (Otus scops) Science Article 1 abstract The Scops Owl Otus scops is probably the least known European owl. We surveyed Scops Owls in the Trento region (6200 km2) of the central-eastern Italian Alps between 1995 and 2003 and we intensively monitored a subpopulation in a 50-km2 plot between 2000 and 2003. In the whole […]
The structure of song and its geographical variation in the scarlet tanager (Piranga olivacea)
Scarlet Tanager (Piranga olivacea) Science Article 2 abstract no abstract Shy, Eyal, American Midland Naturalist; Jul1984, Vol. 112 Issue 1, p119, Download article download full text (pdf)
PIGMENTATION IN THE SCARLET TANAGER, PIRANGA OLIVACEA
Scarlet Tanager (Piranga olivacea) Science Article 1 abstract Conspicuous coloration of passerines and probably of many other birds is importantin species recognition and sexual behavior (Hamilton, 1961). The signalfunctions of plumages have accompanied the evolution of sexual dimorphism ALAN H. BRUSH, THE CONDOR, 69:549-559, 1967 Download article download full text (pdf)
A new subspecies of Scarlet Macaw and its status and conservation
Scarlet Macaw (Ara macao) Science Article 1 abstract Scarlet Macaws from northern Middle America (Mexico through Nicaragua) differ from those occurring from Costa Rica southward throughout the species’ range in South America. This new subspecies (Ara macaw cyanoptera) differs in having yellow wing covert feathers tipped with blue, but with no green band separating the […]
A NEW SUBSPECIES OF SCARLET MACAW ANO ITS STATUS ANO CONSERVATION
Scarlet Macaw (Ara macao) Science Article 3 abstract Scarlet Macaws from northern Middle America (Mexico through Nicaragua) differ from those occurring from Costa Rica southward throughout the species’ range in South America. This new subspecies (ATa macav cyanoptera)differs in having yellow wing covert feathers tipped with blue, but with no green band separating the yellow […]
Response of a Scarlet Macaw Ara macao population to conservation practices in Costa Rica
Scarlet Macaw (Ara macao) Science Article 2 abstract The Central Pacific Conservation Area contains one of Costa Rica’s two viable, but threatenedScarlet Macaw Ara macao populations. For 14 years (1990-2003), we monitored the size of thispopulation. Non-linear models fitted to 1990-1994 observations revealed seasonal and longtermchanges in population size. The peak of annual population size […]
FOOD HABITS OF THE SCARLET AND WHITE IBIS IN THE ORINOCO PLAINS
Scarlet Ibis (Eudocimus ruber) Science Article 3 abstract The Scarlet Ibis is neotropical and distributed from the northeastern coast of South America from Colombia to Brazil and the Orinoco Llanos. The White Ibis occurs from the coastal plain of southern North America, through Central America, into Venezuela (Hancock et al. 1992). EDUARD AGUILERA,C RISTINAR AMO […]
FORAGING ECOLOGY OF SEVEN SPECIES OF NEOTROPICAL IBISES (THRESKIORNITHIDae) DURING THE DRY SEASON IN THE LLANOS OF VENEZUELA
Scarlet Ibis (Eudocimus ruber) Science Article 1 abstract sympatric species of ibises (Threskiomithidae) in the Venezuelan llanos during the dry season of 1989. Scarlet (Eudocimus ruber), Glossy (Plegadis falcinellus), and Bare-faced (Phimosus infiscatus) ibises were the most common species. White (E. albus), Green (Mesembrinibis cayennensis), Sharp-tailed (Cercibis oxycerca), and Buff-necked( Theristicus caudatus) ibises together made […]