Black-headed Gull (Larus ridibundus) Science Article 2 abstract During early development male offspring in avian species often suffer from enhanced mortality compared to female offspring. This has been attributed to different nutritional requirements, as sex-biased mortality has been reported particularly in sexually size-dimorphic species. However, other traits of the male phenotype, such as the embryonic […]
Hatching date influences age at first reproductionin the black-headed gull
Black-headed Gull (Larus ridibundus) Science Article 1 abstract In long-lived colonial birds, age at recruitment is an important life-history character. Variation in this parameter may reflect differences in several factors, including competitive ability and breeding strategies. Further, these differences may be due to timing of hatching (for instance through differences in competitive ability). We investigated […]
Sympatry of the Black-faced Hawk Leucopternis melanopsand the White-browed Hawk Leucopternis kuhli in theLower Rio Tapajos, Para, Brazil
Black-faced Hawk (Leucopternis melanops) Science Article 1 abstract Black-faced Hawk Leucopternis melanops is distributed north of the Amazon riverand has been considered allopatric with Leucopternis kuhli, a similar species (or raceseparated by the Amazon river) south of the Amazon. However, doubt exists as towhether L. melanops also occurs south of the Amazon. Although two specimens […]
Open-habitat birds in recently burned areas: the role of the fire extent and species’ habitat breadth
Black-eared Wheatear (Oenanthe hispanica) Science Article 1 abstract Single burned areas contained 0 to 15 open-habitat species (mean = 7.6), and in all the areas combined there were 22 species, including 17 with an unfavourable conservation status in Europe. The most frequent were Carduelis cannabina, Lullula arborea, Alectoris rufa, Oenanthe hispanica and Emberiza cia, but […]
NOTES ON THE LIFE HISTORY OF THE BLACK-CRESTEDANT SHRIKE IN SURINAM
Black-crested Antshrike (Sakesphorus canadensis) Science Article 1 abstract The Black-crested Ant Shrike (Sakesphorus cayanensis) is a mediumsized member of the large, neotropical family of antbirds (Formicariidae). In the male the head, sides of face, throat, and breast are uniform black. The abdomen and sides of the breast are slate gray, while the upper back is […]
DISCOVERY OF BREEDING BLACK-CAPPED PETRELS ON HISPANIOLA
Black-capped Petrel (Pterodroma hasitata) Science Article 3 abstract The status of the Black-capped Petrel (Pterodroma hasitata), which formerly bred on several West Indian islands, has been obscure since late in the nineteenth century, when the location of the diminishing breeding colonies was lost to science DAVID B. WINGATE, The Auk, 81: 147-159. April, 1964 Download […]
A RE-EVALUATION OF THE STATUS OF THE ENDANGEREDBLACK-CAPPED PETREL, PTERODROMA HAS/TATA, IN CUBA
Black-capped Petrel (Pterodroma hasitata) Science Article 1 abstract The Black-capped Petrel, Pterodroma hasitata, is the only extant gadfly petrel known to breed in the West Indies region. Now seriously threatened or endangered, breeding populations are known on only one of the five historically documented breeding islands David S. Lee & Nicasio Vina, ORNITOLOGIA NEOTROPICAL 4:99-101 […]
A Black-capped Petrel Specimen from Florida
Black-capped Petrel (Pterodroma hasitata) Science Article 2 abstract The Black-capped Petrel (Pterodroma hasitata) is a rare bird anywhere in North America (Palmer, 1962). and may exist only in small numbers throughout the world because of habitat alteration Glen E. Woolfenden, Florida Field Naturalist Vol. 2 Spring 1974 Download article download full text (pdf)
RESULTS OF SEARCH FOR NESTING BLACK-CAPPED PETRELS (Pterodroma hasitata) IN DOMININCA
Black-capped Petrel (Pterodroma hasitata) Science Article 4 abstract Evidence shows the Black-capped Petrel was abundant in Dominica during the last half of the 19th century (Bent 1922, Lawrence 1878). Studies done in the early 20th century continued to show the bird was seen ‘not infrequently’ off the coast of Dominica in the vicinity of Roseau […]
THE NESTING OF SOME VENEZUELAN BIRDS
Black-capped Donacobius (Donacobius atricapilla) Science Article 2 abstract I passed the interval from 15 March to 24 July 1966 at ‘La Araguata,’ a large cattle farmsituated among the hills near Pirapira, some 20 miles south of Valencia in the state ofCarabobo, Venezuela. Although most of my time was devoted to the study of the RufousfrontedThornbird […]