Sparrowhawk (Accipiter nisus) Science Article 5 abstract No significant diurnal variation in mean weight was detected in trapped European Sparrowhawks (Accipiter nisus). Weights of males fluctuated rather little through the year, but were highest in March and lowest in August. During the breeding cycle, males lost weight slightly in the prelay/early laying periods, when they […]
A test of the condition-bias hypothesis yields different results for two species of sparrowhawks (Accipiter)A Test Of The Condition-Bias Hypothesis Yields Different Results For Two Species Of Sparrowhawks (Accipizter)
Sparrowhawk (Accipiter nisus) Science Article 2 abstract Determination of body condition of birds is important for many field studies. However, when using trapping methods based on food as a lure, the sample of trapped birds could be biased toward individuals in poor physical condition. We provide information on body mass, body condition, and sex and […]
Causes and consequences of breeding dispersal in the Sparrowhawk Accipiter nisus
Sparrowhawk (Accipiter nisus) Science Article 1 abstract Sparrowhawks Accipiter nisus were present on particular territories for only one breeding season, but others were present on the same territory for up to eight seasons. Short periods of occupancy were due partly to mortality and partly to about one third of surviving birds of both sexes changing […]
Spanish Sparrow Passer hispaniolensis breeding success in 2002 in southern Portugal
Spanish Sparrow (Passer hispaniolensis) Science Article 2 abstract […]. During the breeding season of 2002 (from May to June), the breeding biology of the Spanish Sparrow was studied in the region of Castro Verde (37 deg 41?N, 08 deg 03?W, Alentejo, Southern Portugal). The Castro Verde region is a cereal steppe with cereal crops alternating […]
Variation of nestling diet across the breeding season in Spanish Sparrow Passer hispaniolensis in southern Portugal
Spanish Sparrow (Passer hispaniolensis) Science Article 1 abstract […]. The study was carried out in May and June 2000 in Castro Verde, Southern Portugal (37 deg 41?N, 08 deg 03?W). The Castro Verde region is a cereal crop steppe, alternating with fallow grounds, which are usually grazed by sheep and cattle. The sparrows nest in […]
Parental Care, Male Desertion, and Reproductive Success in the Spanish Sparrow, Passer hispaniolensis
Spanish Sparrow (Passer hispaniolensis) Science Article 3 abstract Parental care in altricial birds is costly, and mate desertion can occur due to sexual conflict over the level of parental investment in the offspring. This cessation of parental care by 1 parent can affect the success of the current reproduction. In the Spanish Sparrow (Passer hispaniolensis), […]
Long-term changes in nest defense intensity of the spanish Imperial Eagle Aquila adalberti.
Spanish Imperial Eagle (Aquila adalberti) Science Article 1 abstract This paper deals with the variations recorded in the nest defence of the Imperial Eagle Aquila adalberti after the declaration of Donana as a national park (Parque Nacional Donana, SW Spain) and the cessation of strong human pressure. Increases have been detected in the defence and […]
Notes on reproduction of the Southern lapwing , in Colombia
Southern Lapwing (Vanellus chilensis) Science Article 1 abstract Despite its wide distribution throughout most of South America, the Southern Lapwing (Vanellus chilensis) remains poorly studied, and even the most basic aspects of its natural history have been only briefly reported. According to Johnsgard (1981) four subspecies are recognized, of which. only cayennensis occurs at the […]
Diet composition and prey choice of the Southern grey shrike Lanius meridionalis L. in South-eastern Spain: the importance of vertebrates in the diet
Southern Grey Shrike (Lanius meridionalis) Science Article 2 abstract The Southern grey shrike consumes several beetle types, grasshoppers, and, during the breeding period, lizards. Birds and small mammals are captured incidentally. It consistently rejects prey smaller than 10 mm long, and prey are larger during the breeding period and summer. Compared with other populations of […]
Biometrics of the Southern Grey Shrike Lanius meridionalis in relation to age and sex.
Southern Grey Shrike (Lanius meridionalis) Science Article 1 abstract The biometrics of Southern Grey Shrike Lanius meridionalis and differences from the closely related Great Grey Shrike L. excubitor are poorly characterised. The aim of this study was to describe sex and age variation in external biometric measurements for the nominate Southern Grey Shrike L. m. […]