Northern Harrier (Circus cyaneus) Science Article 2 abstract Egg and liver samples of Montagu’s and Marsh Harriers from the 1990’s were examined for their burden of DDT and PCB. The DDT burden in both species was distinctly higher in the eggs than in juveniles and adults, whereby the values for the adults were clearly higher […]
Tag: all of Circus
Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus
Northern Harrier (Circus cyaneus) Science Article 4 abstract Hen Harriers Circus cyaneus and Montagu’s Harriers Circus pygargus are medium-sized raptors that differ in size (Hen Harrier being slightly bigger than Montagu’s Harrier) and breeding system (Montagu’s Harriers are semi-colonial and Hen Harriers defend nesting-hunting territories). In contrast, the diets of the two species when in […]
Copulatory Behavior Of Semi-Colonial Montagu’s Harriers
Montagus Harrier (Circus pygargus) Science Article 1 abstract The copulatory behavior of the monogamous Montagu’s Harrier (Circus pygargus) was studied between 1992 and 1995 near Madrid, Spain. Copulations started around 20 days before laying, and typically stopped at the end of the laying period. Copulation frequency peaked just before the start of the laying period, […]
The diet of Montagu’s Harriers Circus pygargus in relation to land-use systems in pseudosteppe areas of Extremadura (SW Iberian Peninsula)
Montagus Harrier (Circus pygargus) Science Article 6 abstract The feeding of Montagu’s Harriers Circus pygargus during the breeding period was studied in relation to the land-use systems (agricultural or pasture-lands) in pseudosteppe areas of Extremadura (SW Spain). A total of 1,180 prey items was identified from the combined analysis of pellets and prey remains collected […]
Food-niche differentiation in sympatric Hen Circus cyaneus and Montagu’s Harriers Circus pygargus
Montagus Harrier (Circus pygargus) Science Article 5 abstract Hen Harriers Circus cyaneus and Montagu’s Harriers Circus pygargus are medium-sized raptors that differ in size (Hen Harrier being slightly bigger than Montagu’s Harrier) and breeding system (Montagu’s Harriers are semi-colonial and Hen Harriers defend nesting-hunting territories). In contrast, the diets of the two species when in […]
Satellite tracking of two Montagu’s Harriers ( Circus pygargus ): dual pathways during autumn migration
Montagus Harrier (Circus pygargus) Science Article 4 abstract Autumn migration routes of two Dutch female Montagu’s Harriers (Circus pygargus) were documented for the first time using satellite telemetry. Both migrated to their African wintering area
Age-related differences in foraging behaviorof Montagus harrier Circus pygargus males in south-east Poland
Montagus Harrier (Circus pygargus) Science Article 2 abstract The hunting behaviour and habitat use of second-calendar-year males (subadult) and grey (adult) males of Montagu’s harrier Circus pygargus were compared in south-east Poland. Subadult males performed cruising flights less frequently than did adult males. In contrast, subadult males more frequently soared thermals and were harassed more […]
Veranderungen in der Zusammensetzung der PCB- und DDT-Gemische in verschiedenen Lebensstadien der Wiesenweihe (Circus pygargus) und der Rohrweihe (Circus aeruginosus) in Nordrhein-Westfalen, Deutschland
Montagus Harrier (Circus pygargus) Science Article 3 abstract Egg and liver samples of Montagu’s and Marsh Harriers from the 1990’s were examined for their burden of DDT and PCB. The DDT burden in both species was distinctly higher in the eggs than in juveniles and adults, whereby the values for the adults were clearly higher […]
Long-Winged Harrier Predation on Wattled Jacana Eggs
Long-winged Harrier (Circus buffoni) Science Article 1 abstract Long-winged Harriers (Circus buffoni) prey on small birds, mammals, and reptiles (ffrench, A Guide to the Birds of Trinidad and Tobago, 1973:1131. Although they take eggs of various species of birds (Haverschmidt, The Birds of Surinam 1968:67), no records are available on the efficiencies and rates of […]
Western Marsh Harrier (Circus aeruginosus)
[order] ACCIPITRIFORMES | [family] Accipitridae | [latin] Circus aeruginosus | [authority] Linnaeus, 1758 | [UK] Western Marsh Harrier | [FR] Busard des roseaux | [DE] Rohrweihe | [ES] Aguilucho Lagunero Occidental | [NL] Bruine Kiekendief Subspecies Monotypic species Genus The genus Circus is a cosmopolitan genus of about ten species. They are medium-sized, slender hawks, […]