Hooded Crow (Corvus corone cornix) Science Article 2 abstract The study area (16 km2) in ‘Ujscie Warty’ National Park, W Poland-was the valley of a lowland river at its confluence with the River Odra, covered by a mosaic of grassy vegetation and willow scrub. 111 breeding attempts were recorded during 2000-2002. The mean nest density […]
Category: Corvidae
Identifying the demographic determinants of population growth rate: a case study of red-billed choughs Pyrrhocorax pyrrhocorax
Chough (Pyrrhocorax pyrrhocorax) Science Article 3 abstract Identifying which age-specific demographic rates underlie variation in a population’s growth rate (?) is an important step towards understanding the population’s dynamics. Using data from a 20-year study of marked individuals, we describe patterns of demographic variation and covariation in the Scottish red-billed chough population (Pyrrhocorax pyrrhocorax), and […]
Breeding density and distribution of Choughs Pyrrhocorax pyrrhocorax nesting in river cliffs: The role of nest-site availability.
Chough (Pyrrhocorax pyrrhocorax) Science Article 2 abstract The breeding abundance of Choughs Pyrrhocorax pyrrhocorax was investigated in relation to type of rock and related features of nesting cliffs along rivers in south-eastern Madrid (Central Spain). Gypsum cliffs are larger and provide more nest sites than clay and limestone cliffs. Cliffs used by breeding Choughs contained […]
Age-specific reproductive performance in red-billed choughs Pyrrhocorax pyrrhocorax: patterns and processes in a natural population
Chough (Pyrrhocorax pyrrhocorax) Science Article 5 abstract Using data from a 20-year study of individually marked red-billed choughs, we examine how reproductive performance varies with age in male and female breeders, and investigate whether population-level trends result from changes in individual performance and/or the phenotypic composition of the breeding population. Across the population, mean clutch […]
Environmental variability, life-history covariation and cohort effects in the red-billed chough Pyrrhocorax pyrrhocorax
Chough (Pyrrhocorax pyrrhocorax) Science Article 4 abstract The consequences of environmental variability for life-history evolution are predicted to depend on the pattern of covariation amongst life-history traits. Using data from a 20-year study of individually marked red-billed choughs, we investigate the short- and long-term life-history consequences of population-wide variation in reproductive conditions, and demonstrate clear […]
Demographic consequences of prey availabilityand diet of Red-billed Choughs Pyrrhocoraxpyrrhocorax
Chough (Pyrrhocorax pyrrhocorax) Science Article 6 abstract Capsule Variation in prey availability appears to influence Chough fledging success and juvenile survival. Aims To determine seasonal and annual variations in Chough prey and how these influence fledging success and juvenile survival. CHRISTIAN KERBIRIOU and ROMAIN JULLIARD, Bird Study (2007) 54, 296-306 Download article download full text […]
Pair composition and reproductive success across a hybrid zone of carrion crows and hooded crows
Carrion Crow (Corvus corone corone) Science Article 2 abstract The Carrion Crow (Corvus corone corone) and the Hooded Crow (C. corone cornix) have parapatric ranges in Europe with narrow areas of hybridization. Reproductive biology of populations of Carrion and Hooded crows and hybrids is described for four areas in northern Italy. Nonrandom mating was observed […]
Reproductive success increases with group size in cooperativecarrion crows, Corvus corone corone
Carrion Crow (Corvus corone corone) Science Article 5 abstract The effect of group size and the number of helpers on reproductive success is crucial to understand theevolution and maintenance of cooperative breeding. In northern Spain, carrion crows form kin-groups(three to nine individuals) where up to five individuals contribute to rearing the young DANIELA CANESTRARI et […]
Kleptoparasitism by Peregrine Falcons on Carrion Crows
Carrion Crow (Corvus corone corone) Science Article 1 abstract […]. The study area was Bizkaia, a small province of 2300 km2 located in the north of Spain. In this area we have monitored about 35-38 Peregrine territories since 1997. During this time we have studied the prey of Peregrines in the nests, recording 931 prey […]
Does year-round territoriality rather than habitat saturation explain delayed natal dispersal and cooperative breeding in the carrion crow?
Carrion Crow (Corvus corone corone) Science Article 4 abstract The ecological factors that promote delayed dispersal of offspring in cooperatively breeding bird species are poorly understood. While single population studies have supported the view that natal dispersal is delayed as a consequence of lack of suitable breeding vacancies (ecological constraints hypothesis), recent theoretical models claim […]