Collared Forest Falcon (Micrastur semitorquatus) Science Article 3 abstract Five of the seven species of the mysterious Forest-falcons (Micrastur: Falconidae) occur en Los Amigos river basin, Madre de Dios, Peru Ursula Valdez, Boletin SAO Vol. XVI (No. 02) – Dic. 2006 Download article download full text (pdf)
NEST-SITE CHARACTERISTICS AND BREEDING DENSITY OFTWO SYMPATRIC FOREST-FALCONS IN GUATEMALA
Collared Forest Falcon (Micrastur semitorquatus) Science Article 2 abstract The Barred Forest-Falcon (Micrastur ruficollis) and Collared Forest-Falcon (M. semitorquatus) are cavity nesters with similar geographic distributions but differences in body size. For Barred and Collared forest-falcons, nest height averaged 17 and 20 m above ground, nest tree dbh averaged 95 and 167 cm, and nest […]
Availability and use of public information and conspecific density for settlement decisions in the collared flycatcher
Collared Flycatcher (Ficedula albicollis) Science Article 4 abstract Public information, i.e. local reproductive performance of conspecifics, is expected to be a highly valuable cue for breeding habitat selection. However, the access to this cue may be spatially and temporally constrained. When public information is unavailable, individuals may use other integrative cues, such as the local […]
Evolution and expression of genetic variation in nestling traits
Collared Flycatcher (Ficedula albicollis) Science Article 2 abstract Environmental conditions experienced during early life are known to impact upon the development of passerinenestlings, as well as on their performance and fitness as adults. Nevertheless, little is yet known about the relative importanceof different types of maternal, environmental and genetic effects as proximate determinants of variation […]
Immune challenge mediates vocal communication in a passerine bird: an experiment
Collared Flycatcher (Ficedula albicollis) Science Article 3 abstract Secondary sexual characters may have evolved in part to signal resistance to parasites. Avian song has been hypothesized to be involved in this process, but the role of parasites in modulating acoustic communication systems in birds remains largely unknown, owing to lack of experiments. We studied the […]
Reproductive investment and moult-breeding overlap in the collared flycatcher Ficedula albicollis: an experimental approach
Collared Flycatcher (Ficedula albicollis) Science Article 1 abstract We manipulated brood sizes of 132 pairs of the collared flycatcher to investigate whether or not an investment in reproduction was traded against an investment and timing of the post-nuptial moult. Our manipulations did not affect the probability of moult-breeding overlap in males, and there was no […]
Survival to first breeding is not sex-specific in the Coal Tit (Parus ater)
Coal Tit (Parus ater) Science Article 1 abstract Differential survival of males and females affects the structure and dynamics of avian populations, but studying sex-specific survival rates is difficult. This is especially true for offspring if the period between hatching and first breeding is considered. Under certain conditions, however, the determination of offspring sex ratio, […]
Winter Distribution of Subspecies of Clapper Rails (Rallus longirostris) in Florida with Evidence for Long-distance and Overland Movements
Clapper Rail (Rallus longirostris) Science Article 1 abstract Little is known of the extent of movement and winter ranges of Clapper Rails (Rallus longirostris) in the United States despite years of study by ornithologists and game biologists (Stewart 1951, 1954;Mangold 1977). For example, only recently was it learned that the endangered southwestern population, R. l. […]
Breeding biology of the citrine wagtail (Motacilla citreola) in the Gdansk region (N Poland)
Citrine Wagtail (Motacilla citreola) Science Article 1 abstract In the years 1997-2001, I observed 28 broods of the Citrine Wagtail (Motacilla citreola) in the Gulf of Gdask region. First birds arrived at the study area at the end of April. A successful breeding cycle lasted about 1 month and included: 3-4 days of nest building, […]
Phylogeographic patterns in Motacilla flava and Motacilla citreola: species limits and population history
Citrine Wagtail (Motacilla citreola) Science Article 2 abstract We conducted phylogeographic analyses of Motacilla fl ava (Yellow Wagtail) andM. citreola (Citrine Wagtail). We analyzed mitochondrial DNA sequences from 167 M. fl avaspecimens obtained from 17 localities throughout Eurasia and Alaska, and 38 specimens of M.citreola obtained from 7 Eurasian localities. Phylogenetic analysis revealed three clades […]