Evening Grosbeak (Hesperiphona vespertina) Science Article 2 abstract All the authorities that have dealt with the plumages of the Evening Grosbeak have described the juveniles of both sexes as resembling the adult female. Allan Brooks, The AUK vol. 56, 1939 Download article download full text (pdf)
WINTER SURVEY DATA REVEAL RANGEWIDE DECLINE IN EVENINGGROSBEAK POPULATIONS
Evening Grosbeak (Hesperiphona vespertina) Science Article 3 abstract Once one of the most common species seen at bird feeding stations across much of North America in winter, the Evening Grosbeak (Coccothraustes vespertinus), appears to be experiencing a population decline. Like other finches associatedwith the boreal forest or high elevations, Evening Grosbeaks form flocks in winter, […]
THE SUBSPECIES OF HESPERIPHONA VESPERTINA
Evening Grosbeak (Hesperiphona vespertina) Science Article 1 abstract The writer’s attention was first called to the systematic status of the Evening Grosbeaks of western North America by Mr. Allan Brooks who stated in a letter that he had found certain peculiarities in his series gathered in British Columbia. JOSEPH GRINNELL, THE CONDOR Vol. 19, 1917 […]
Diet and foraging behaviour of the British Storm Petrel Hydrobates pelagicus in the Bay of Biscay during summer.
European Storm-petrel (Hydrobates pelagicus) Science Article 4 abstract The diet and the foraging behaviour of the British Storm Petrel Hydrobates pelagicus during the breeding period were studied from proventriculus contents obtained from adults belonging to two populations in the Bay of Biscay. The observed prey had various ecological affinities in two main groups. The first […]
The timing and pattern of moult of flight feathers of European Storm-petrel Hydrobates pelagicus in Atlantic and Mediterranean breeding areas
European Storm-petrel (Hydrobates pelagicus) Science Article 2 abstract Aims: We describe the pattern and timing of moult in European Storm-petrels Hydrobates pelagicus.Location: Benidorm Island (eastern Spain, Mediterranean Iberian coast) and Vizcaya (northern Spain, Atlantic Iberian coast).Methods: Birds were caught with mist-nests set in breeding colonies and the state of flight feathers was scored. Primary, secondary […]
Population size estimation and metapopulation relationships of Storm Petrels Hydrobates pelagicus in the Gulf of Biscay.
European Storm-petrel (Hydrobates pelagicus) Science Article 5 abstract Storm Petrels Hydrobates pelagicus are notoriously difficult to census because they nest in burrows and crevices, they visit land at night, and colonies are usually visited by large numbers of itinerant pre-breeding birds (Ratcliffe et al 1998, Insley et al 2002). The Spanish Storm Petrel population has […]
Ages of Storm Petrels Hydrobates pelagicus prospecting potential breeding colonies
European Storm-petrel (Hydrobates pelagicus) Science Article 1 abstract Each year, ringers using sound lures mark and recapture immature Storm Petrels Hydrobates pelagicus prospecting potential breeding colonies. Attempts have been made to estimate the size of this population, but a full demographic model has not been possible since the age structure of this population has not […]
Olfactory foraging strategies of procellariiform seabirds
European Storm-petrel (Hydrobates pelagicus) Science Article 3 abstract The study of olfactory foraging ability in procellariiform seabirds is now beginning to explore how species aremorphologically and behaviorally adapted to track odor plumes, and to relate these findings to models of odor transport innatural situations. According to the models, odors in atmospheric flow tend to be […]
Gonadal status upon spring arrival in long-distance and short-distancemigrating stonechats ( Saxicola torquata)
European Stonechat (Saxicola rubicola) Science Article 2 abstract Long-distance migration is often associated with relatively short breeding seasons and a start of reproductive activities shortly after arrival. The full activation of the reproductive system from the regressed state takes, however, several weeks and must, therefore, be initiated in the winter quarters or during spring migration. […]
Timing of molt as a buffer in the avian annual cycle
European Stonechat (Saxicola rubicola) Science Article 1 abstract Birds in seasonal environments must time stages in their annual life cycles precisely. While the fitness costs ofmistimed reproduction and migration are widely recognized, molt has been viewed as a more flexible element. Birds modify thetiming of molt in various ways to keep to overall timetables, but […]