European Robin (Erithacus rubecula) Science Article 3 abstract Partially migratory behavior, the occurrence of resident and migratory individuals in a population, has been reported in free-living birds. I examined this behavior in the European Robin (Erithacus rubecula) under controlled experimental conditions. In an offspring group from a partially migratory field population, 36 (78%) individuals exhibited […]
Migration and flight behaviour of Honey Buzzards Pernis apivorus in Southern Israel observed by radar.
European Honey Buzzard (Pernis apivorus) Science Article 1 abstract Observations on the schedule, volume and direction of spring and autumn migration of Honey Buzzards Pernis apivorus show that the northern Arava is at the southeastern edge of the species’ main autumn flyway (funneling into the Negev with southwesterly directions), and at the northwestern edge of […]
Reduced availability of refuse and breeding output in a herring gull (Larus argentatus) colony
European Herring Gull (Larus argentatus) Science Article 1 abstract We studied the reproductive performance of herring gulls (Larus argentatus) in an old stable colony in SW Finland. Over the period 1993-1997, the colony decreased, and the garbage dumps the birds may have utilised have all closed. This had an effect on the breeding performance of […]
Herring Gull Larus argentatus and Lesser Black-backed Gull L. fuscus feeding at fishing vessels in the breeding season: Competitive scavenging versus efficient flying
European Herring Gull (Larus argentatus) Science Article 9 abstract The distribution and feeding range of Herring Gulls and Lesser Black-backed Gulls breeding on the Dutch Wadden Sea islands were assessed, using the results of ship-based surveys in the southern North Sea. The occurrence of both species in association with commercial fishing vessels is described in […]
Skull Deformity in a Herring Gull Chick (Larus argentatus)
European Herring Gull (Larus argentatus) Science Article 3 abstract A skull deformity resulting in death of a herring gull chick (Larus argentatus) isdescribed in detail. The bones of the skull and upper jaw were twisted, assymetrical and of unusual size or absent. The lower jaw had an almost
Egg predation in the Herring Gull Larus argentatus: Why does it vary so much between nests?
European Herring Gull (Larus argentatus) Science Article 8 abstract We studied egg loss in Herring Gulls Larus argentatus on the Dutch Frisian Island of Terschelling. Conspecific egg predation was the main cause of egg loss. Late breeding, a small inter-nest distance and a low vegetation cover enhanced egg predation. Predation was more frequent in nests […]
Breeding Lesser Black-backed Gulls Larus graellsii and Herring Gulls Larus argentatus: Coexistence or competition?
European Herring Gull (Larus argentatus) Science Article 10 abstract While Lesser Black-backed Gull Larus graellsii numbers increase substantially at the German North Sea coast since the late 1980s, Herring Gull Larus argentatus numbers have been roughly stable since the mid-1980s. In order to investigate whether a different ecology might explain the current trends, we studied […]
Effects of changes in the availability of human refuse on breeding parameters in a Herring Gull Larus argentatus population in Brittany, France
European Herring Gull (Larus argentatus) Science Article 7 abstract Feeding behaviour and breeding parameters of Herring Gulls Larus argentatus were studied on Treberon, France, before (1983-88) and after (1989) a decrease of 80% in the amount of refuse dumped at a nearby tip. In 1989, fewer gulls visited the refuse tip than before the alteration, […]
Courtship feeding between Yellow-legged Gull Larus cachinnans and Herring Gull L. argentatus in the Western Mediterranean
European Herring Gull (Larus argentatus) Science Article 5 abstract Several species of large white-headed gulls, genus Larus, often hybridize freely where they occur sympatrically (Ingolfsson 1987, Pierotti 1987, Spear 1987, Pierotti & Annett 1993). In the Ebro Delta (Ebro Delta National Park, 40
Diseases and Pathological Conditions of the Herring Gull
European Herring Gull (Larus argentatus) Science Article 4 abstract Many wild birds are parasitised by organisms that afflict domestic animals particularly poultry, and even man. Perhaps the best examples are the encephalomyelitis viruses which can kill domestic animals and man, but which have little or no effect on the bird natural hosts3. Large numbers of […]