Bald Eagle () Science Article 1 abstract Unprecedented mortality occurred in bald eagles (Haliaeetus leucocephalus) at DeGray Lake, Arkansas, during the winters of 1994-1995 and 1996-1997. The first eagles were found dead during November, soon after arrival from fall migration, and deaths continued into January during both episodes. In total, 29 eagles died at or […]
Category: Accipitriformes
Elanus leucurus breeding in Surinam
White-tailed Kite (Elanus leucurus) Science Article 2 abstract The South American race of the White-tailed Kite (E. l. leucurus) according to Hellmayr and Conover (‘Catalogue of Birds of the Americas’. Field Mus. Nat. Hist., Zool. Set. 13, pt. 1, No. 4: 18, 1949) has been found definitely breeding only in Argentina and Chile. ‘The scattered […]
Food partitioning between breeding White-tailed Kites(Elanus leucurus; Aves; Accipitridae) and Barn Owls(Tyto alba; Aves; Tytonidae) in southern Brazil
White-tailed Kite (Elanus leucurus) Science Article 1 abstract I examined the diet of breeding White-tailed Kites (Elanus leucurus; Aves; Accipitridae) and Barn Owls (Tyto alba; Aves; Tytonidae) in an agrarian area of southern Brazil by analyzing regurgitated prey remains. The objective was to evaluate how these raptors, which differ markedly in their hunting activity periods […]
PREY OF THE WHITE-TAILED KITE IN CENTRAL CHILE AND ITS RELATION TO THE HUNTING HABITAT
White-tailed Kite (Elanus leucurus) Science Article 3 abstract Between November 1973 and January 1974 we collected 702 pellets of Whitetailed Kites (Elanus lecurus) in two areas of central Chile differing in their vegetation physiognomy (disturbed versus undisturbed). We compared the diversity, age structure, and mean prey size of items found in pelletsf rom both simmTs.h […]
Nest-site selection by Marsh Harrier (Circus aeruginosus) in the shore belt of Helophytes on large lakes
Western Marsh Harrier (Circus aeruginosus) Science Article 2 abstract Nest-site selection by Marsh Harrier (Circus aeruginosus) was investigated on Lakes Meteliaiand Obelija in 1983n1986 and Lake fialtytis in 1984n1986 in southern Lithuania. Fifty five breedingpairs were detected and 49 nests (89.1%) were found. With regard to the potential breeding habitat,Lakes Meteliai and fialtytis represented extreme […]
The effect of predation by Marsh Harriers Circus aeruginosus on the survival of ducklings and game bird chicks.
Western Marsh Harrier (Circus aeruginosus) Science Article 4 abstract The level of predation by a pair of Marsh Harriers Circus aeruginosus on ducklings and gamebird chicks was calculated from observations of hunting ranges, feeding rates and diet, and estimates of the availability of prey during the breeding season. The harriers took 22% of the Pheasant […]
New material supplies in the Marsh Harrier Circus aeruginosus sexual roles daily and seasonal activity patterns and rainfall influence
Western Marsh Harrier (Circus aeruginosus) Science Article 5 abstract Nest maintenance is an important part of parental care for the Marsh Harrier Circus aeruginosus throughout the entire breeding period. Nest material supply trips are mainly carried out by the female as the male only contributes during incubation and the early nestling period. The trips rate […]
Main migratory direction of Marsh HarrierCircus aeruginosus: an analysis of recovery data ofspecimens ringed in Latvia from 1925 to 2004
Western Marsh Harrier (Circus aeruginosus) Science Article 1 abstract Th is paper describes the main migratory directions of the Latvian Marsh Harrier Circus aeruginosuspopulation and provides an overview of recovery data. Th e study was based on analysis of recoverydata of Marsh Harrier that were ringed in Latvia from 1925 to 2004 and subsequently recovered.In […]
Reproduction of the Marsh Harrier Circus aeruginosus in recent land reclamations in The Netherlands.
Western Marsh Harrier (Circus aeruginosus) Science Article 6 abstract We studied temporal variation in reproductive performance of Marsh Harriers Circus aeruginosus in two land reclamations in The Netherlands, i.e. South Flevoland and the Lauwersmeerpolder, embanked in 1968 and 1969 respectively. The number of breeding pairs in Flevoland rapidly increased to a maximum of 350 pairs […]
Predation by a Marsh Harrier Circusaeruginosus on Yellow-legged GullLarus michahellis nests
Western Marsh Harrier (Circus aeruginosus) Science Article 8 abstract This note reports a case of predation by an adult female Marsh Harrier Circus aeruginosus onthree nests of Yellow-legged Gulls Larus michahellis at the Ebro Delta. The predation wasobserved on 4 April 2002 on one of the dykes that separate the saltpan-heaters of La Trinitat(Punta de […]