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 […]
Category: Africa
Ringing recoveries and the increase in numbers of European Great Crested Grebes Podiceps cristatus.
Great Crested Grebe (Podiceps cristatus) Science Article 3 abstract 221 recovery data of European Great Crested Grebes were analysed. Great Crested Grebes migrate SE to winter mainly in southern parts of the (former) Soviet Union or Turkey (Fennoscandian birds), or in the central European lakes (individuals from northwestern Europe). A second wintering area is found […]
Phenology habitat choice and reproduction of the Great Crested Grebe Podiceps cristatus on a fish-farm.
Great Crested Grebe (Podiceps cristatus) Science Article 2 abstract On a fish-farm in The Netherlands Great Crested Grebe breeding pairs arrived in two distinct periods. We suggest this pattern reflects differences in migratory behaviour, whereby late birds are migrants. In early arriving grebes clutch size decreased with an increasing pre-laying period, whereas in late grebes […]
Food intake of Great Crested Grebes Podiceps cristatus wintering on cold water as a function of various cost factors
Great Crested Grebe (Podiceps cristatus) Science Article 4 abstract Food intake rate during the nonbreeding season of Great Crested Grebes Podiceps cristatus was estimated by reconstructing the stomach content of drowned birds from recognizable remains of the fish prey. Food intake by individual birds since the ejection of the last pellet (the accumulated prey mass) […]
Breeding success of Great Crested Grebe Podiceps cristatus on fishponds
Great Crested Grebe (Podiceps cristatus) Science Article 1 abstract Between 1993 and 2000, breeding success of Great Crested Grebe Podiceps cristatus was monitored at two fishpond localities, Vrbje in central and Race in north-eastern Slovenia. During the study 50 and 23 nests with eggs were found, respectively. On average, 1.3 chicks per territorial pair survived […]
Microverontreinigingen in lepelaarkuikens uit het Zwanenwater
Eurasian Spoonbill (Platalea leucorodia) Science Article 1 abstract De broedkolonies van de lepelaar (Platalea leucorodia) behoren tot de meest noordelijke in het verspreidingsgebied van de soort. Sinds het begin van de zestiger jaren heeft de soort sterk onder druk gestaan, met een dramatisch dieptepunt van minder dan 200 broedparen eind jaren zestig. Naast verstoring, habitatverlies, […]
Dispersal and migration in Eurasian Spoonbills Platalea leucorodia
Eurasian Spoonbill (Platalea leucorodia) Science Article 2 abstract Sightings of Eurasian Spoonbills marked at the Odiel marshes, SW. Spain, were analysed to determine the extent of philopatry, sites of dispersal and the temporal and spatial patterns of migration in this population. Odiel Spoonbills winter in the Senegal delta (2500 km south of the Odiel). However, […]
Egyptian Geese Alopochen aegyptiacus moulting on Dassen Island, South Africa
Egyptian Goose (Alopochen aegyptiacus) Science Article 1 abstract Egyptian Geese have increased in numbers in the Western Cape in recent decades, and they are considered agricultural pests in the Swartland region, the grain-producing area on the mainland adjacent to Dassen Island (Hockey et al. 1989). It is possible that traditional moult sites on the mainland […]
Levels of polychlorinated biphenyls andorganochlorine pesticides in serum samples ofEgyptian Vulture (Neophron percnopterus) from Spain
Egyptian Vulture (Neophron percnopterus) Science Article 9 abstract Concentrations of 23 polychlorinated biphenyls (PCBs), p,p0-DDT and two of its metabolites, p,p0-DDE and p,p0-TDE have been measured in serum samples of up to 1 ml of Egyptian Vulture (Neophron percnopterus) gathered from five populations in Spain. B. Gomara and L. Ramos, Chemosphere 55 (2004) 577-583 Download […]
Use of alternative nests for clutch replacement In the Egyptian Vulture Neophron Percnopterus
Egyptian Vulture (Neophron percnopterus) Science Article 1 abstract Many single-brooded bird species may raise young from replacement clutches after failingin an initial attempt. The rate of clutch replacement among raptors varies depending on their size, latitude and food abundance. In temperate regions it seems to be usual in small accipitrids and falcons and less frequent […]