Sedge Warbler (Acrocephalus schoenobaenus) Science Article 2 abstract Orientation cage experiments were performed with 260 Reed Warblers on the southern coast of Spain during autumn 1996, in order to test the hypothesis that birds in good body condition should exhibit a higher amount of migratory restlessness and an activity concentrated more strongly towards one direction […]
Category: Passeriformes
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)
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)
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 […]
High Migratory Fuel Loads Impair Predator Evasion in Sedge Warblers
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 […]
The study of bird migration across the WesternSahara; a contribution with sound luring
Sedge Warbler (Acrocephalus schoenobaenus) Science Article 4 abstract During spring and autumn migration 2003, the Swiss Ornithological Institute set up a concerted project in Mauritania to study bird migration across the Sahara. I participated with a side project using artificial induction of landfall with sound luring in an attempt to overcome the potential problem of […]
Proficient incubation by inexperienced SavannahSparrows Passerculus sandwichensis
Savannah Sparrow (Passerculus sandwichensis) Science Article 3 abstract We compared the incubation behaviour of 1-year-old female Savannah Sparrows Passerculussandwichensis nesting for the first time with that of older females that had nested in previousyears on Kent Island, New Brunswick, Canada. Using temperature probes inserted into 32nests, we determined the length and variability of incubation shifts […]
Post-mortem digestion of stomach contents in the Savannah Sparrow
Savannah Sparrow (Passerculus sandwichensis) Science Article 7 abstract Van Koersveld (Proc. 10th Intern. Ornith. Congr.: 592-594,1 951) demonstrated that digestion in Corvidae continues for 20 to 30 minutes after death unless stopped in somemanner. He also demonstrated that soft-bodied forms such as earthworms were completely digested within that time and wireworm larvae were nearly gone […]
FIFTY:FIFTY OFFSPRING SEX RATIOS IN SAVANNAH SPARROWS (PASSERCULUS SANDWICHENSIS)
Savannah Sparrow (Passerculus sandwichensis) Science Article 2 abstract Over a 14 year period, we determined offspring sex ratios in a population ofSavannah Sparrows (Passerculus sandwichensis) breeding on Kent Island, an isolated 80 ha islandin the Bay of Fundy, New Brunswick, Canada, based on morphological measurements of318 independent juveniles and 361 returning adults of known parentage. […]
SEXUAL DIMORPiHSM AND POPUIATION SEX RATIOS IN JUVENILE SAVANNAH SPARROWS
Savannah Sparrow (Passerculus sandwichensis) Science Article 8 abstract Savannah Sparrows (Passerculus sandwichensis) breeding on Kent Island, New Brunswick, Canada, are polygynous and sexually dimorphic in size. The sex of 7-d-old nestlingscannot be reliably identified by size alone, but juveniles begin to display clear sexualdimorphism in size by the time they reach independence, several weeks after […]