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, […]
Autumn migration of thrushes over eastern Finland: A comparison of visible migration and ringing recovery patterns
Mistle Thrush (Turdus viscivorus) Science Article 1 abstract The migration of thrushes Turdus spp over eastern Finland was investigated using data from 4,482 foreign recoveries of five species ringed in Finland between 1913 and 2001, and records of visible migration of nearly 28,000 thrushes observed during diurnal autumn movements between 1996 and 2001. Ringing recoveries […]
Breeding performance of the middle spotted woodpecker Dendrocopos medius in relation to weather and territory quality
Middle Spotted Woodpecker (Dendrocopos medius) Science Article 5 abstract Reproductive success in birds is influenced by a variety of factors, many of which can be attributed to human activities such as land use or forest management. Others like weather or age of the birds are not under human control but are influential as well. From […]
Nest-site selection and niche partitioning among the Great Spotted Woodpecker Dendrocopos major and Middle Spotted Woodpecker Dendrocopos medius in riverine forest of Central Europe
Middle Spotted Woodpecker (Dendrocopos medius) Science Article 2 abstract We studied nest-site selection of the Great- and Middle Spotted Woodpecker inhabiting the riverine forest remnants of Central Poland. In addition to nest tree characteristics and location in relation to edge proximity, a comparison between nesting and random sites within the woodpeckers’ territories allowed a study […]
Accuracy and efficiency of different techniques for censusing territorial Middle Spotted Woodpeckers Dendrocopos medius
Middle Spotted Woodpecker (Dendrocopos medius) Science Article 3 abstract The aim of the study was to test whether the methods using the playback technique produce accuratedata of population size when compared to the standard mapping and nest-searching methods. The three-visitmethod with audio-stimulation was found to produce data of the same accuracy (100%, n = 11 […]
Factors affecting the occurrence of middle spotted and great spotted woodpeckers in deciduous forests ? a case study from Poland.
Middle Spotted Woodpecker (Dendrocopos medius) Science Article 1 abstract Based on published data on 117 deciduous forest sites studied in Poland, relationships between habitat factors (size of study plot, type and age of forest stands) and breeding of great spotted and middle spotted woodpeckers were examined. As compared with middle spotted woodpeckers, great spotted woodpeckers […]
Characteristics of trees preferred by foraging Middle Spotted Woodpecker Dendrocopos medius in northern Switzerland
Middle Spotted Woodpecker (Dendrocopos medius) Science Article 4 abstract The endangered Middle Spotted Woodpecker Dendrocopos medius is restricted to oak forests. We analysed this woodpecker’s foraging trees and behaviour in a coppice-with-standards wood in the Swiss lowlands. Oaks Quercus spp. were highly preferred and their diameter at breast height mainly ranged from 36-72 cm, corresponding […]
Correlates of hunting range size in breeding merlins
Merlin (Falco columbarius) Science Article 1 abstract I studied variables affecting size of hunting range in breeding Merlins (Falco columbarius) from May to July, 1987-l 990 in Saskatoon, Canada. Males were monitored during most of the breeding season, whereas females were observed only in the fledging period when they hunt. During the incubation period, the […]
ETUDE D’UNE COLONIE DE MOUETTE MELANOCEPHALELarus melanocephalus EN BASSE VALLEE DE LA MARNE :PREMIERS RESULTATS
Mediterranean Gull (Larus melanocephalus) Science Article 2 abstract La Mouette melanocephale Larus melanocephalus connait un spectaculaire essor numerique etgeographique en Europe de l’Ouest depuis la moitie du siecle dernier. Initialement confinee aux rivesukrainiennes de la mer Noire, son aire de reproduction s’est rapidement etendue vers le nord-ouest Francois BOUZENDORF, LE PASSER, 108 vol. 42 n […]
PCBs and organochlorine pesticide residues in eggs of threatened colonial charadriiform species (Aves, Charadriiformes) from wetlands of international importance in northeastern Greece
Mediterranean Gull (Larus melanocephalus) Science Article 4 abstract The levels of eight PCB congeners (IUPAC 8, 20, 28, 52, 101, 118, 138 and 180) and 13 organochlorine pesticides (a-HCH, b-HCH, Lindane, Heptachlor, Heptachlor epoxide, Aldrin, Dieldrin, Endrin, 2,4′-DDT, 2,4′-DDD, 4,4′-DDT 4,4′-DDD and 4,4′-DDE) were measured in eggs of Mediterranean gulls Vassilis Goutner et al, Belg. […]