Guillemot (Uria aalge) Science Article 1 abstract When ashore, a Guillemot Uria aalge usually walks with the tarsus in contact with the ground and this results in severe wear of rings. Even the change from soft to hard metal rings in the early 1960s only increased the useful life of a ring placed on a […]
CHICK DIET AND DAILY ACTIVITY PATTERN OFCOMMON MURRES AND BLACK-LEGGED KITTIWAKESAT BLUFF SEABIRD COLONY,NORTON SOUND, ALASKA
Guillemot (Uria aalge) Science Article 8 abstract At Bluff seabird colony, Norton Sound, Alaska, Common Murres(Uria aalge) fed their chicks with mostly blennies in the afternoon. Parents ofBlack-legged Kittiwakes (Rissa tridactyla) shifted chick guarding duties at any timeof day. Foraging trip time of the murres at Bluff (3.6 hr) was about 1.4-3.3 timeslonger than other […]
Bycatches of common guillemot (Uria aalge) in the Baltic Sea gillnet fishery
Guillemot (Uria aalge) Science Article 5 abstract Bycatch of common guillemots (Uria aalge) appears to be the single most serious threat to the population, and the proportion ofrecoveries of ringed birds in fishing gear, compared with other finding circumstances, has significantly increased during a 28 yearperiod (P
Long-term study of mortality in thecommon guillemot in the Baltic Sea
Guillemot (Uria aalge) Science Article 4 abstract This study is based on a uniquely large and long-term data set ofringed common guillemots (Uria aalge) in the Baltic Sea. We analysedrecoveries of 42,824 common guillemots ringed in Sweden from1912-1998. Most of the birds were juveniles ringed on the island ofStora Karlso in the southern Baltic proper. […]
Competition for breeding sites and site-dependent population regulation in a highly colonial seabird, the common guillemot Uria aalge
Guillemot (Uria aalge) Science Article 7 abstract The hypothesis of site-dependent population regulation predicts that birds utilize available nesting sites in a pre-emptive (ideal despotic) manner, leading to density dependence in heterogeneous habitats as poorer sites are used at higher population densities. At small population sizes adaptive site choice protects populations against fluctuations (the buffer […]
NOTES ON THE BEHAVIOR AND ECOLOGY OF THE RED-COTINGAS (COTINGIDae: PHOENICIRCUS)
Guianan Red-Cotinga (Phoenicircus carnifex) Science Article 1 abstract The two specieso f red-cotingas,P hoenicircus, are little-known birds with a patchy distribution in the rain forests of northern and central South America. We observed the foraging, displays, and vocalizations of the Guianan Red-Cotinga (P. curnifex) in Suriname and of the Black-necked Red-Cotinga (P. nigricollis) in northeastern […]
PREDATION AND ANTIPREDATOR BEHAVIOR AT GUIANAN COCK-OF-THE-ROCK LEKS
Guianan Cock-of-the-rock (Rupicola rupicola) Science Article 1 abstract I documented predator attacks and antipredator behavior at four display sites of Guianan Cock-of-the-Rock (Rupicolaru picola) in Suriname from 1980 to 1985. Most observations were made at a large lek that averaged 55 territorial males, with supplemental data on display groups of 1, 2, and 6 males. […]
Modelling nesting habitat preferences of Eurasian Griffon Vulture Gyps fulvus in eastern Iberian Peninsula
Griffon (Gyps fulvus) Science Article 2 abstract To apply modern habitat modelling techniques using generalized linear models approach to generate not only explicative but also predictive habitat suitability models. Ecological factors that could affect the species? nesting habitat preferences at two spatial scales, one referred to the colony as a sampling unit and another trying […]
Seasonal and daily activity pattern in Griffon Vulture (Gyps fulvus) colonies on the island of Crete (Greece).
Griffon (Gyps fulvus) Science Article 1 abstract Morning and evening counts undertaken in Griffon Vulture Gyps fulvus colonies and communal roosts revealed that their numbers fluctuated by season and time of the day. In the colonies the vultures built up high numbers during the pre-breeding and incubation periods (November-February) with maxima in December-January and dropped […]
A SECOND BREEDING RECORD FOR THE GREY-HOODED GULL (LARUS CZRROCEPHALUS) ON THE COAST OF PERU
Grey-hooded Gull (Chroicocephalus cirrocephalus) Science Article 1 abstract The Grey-hooded Gull (Larms cirrocephalus) is known to breed at only one locality west of the Andes, a small coastal pond named Laguna Chica in the Departamento de lea, Peru (Tovar and Ashmole, Condor 72:119, 1970). We report here a second and larger colony, 56 km north […]