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Documents disponibles écrits par cet auteur (26)
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Stefan Garthe, Auteur ; Karena Haecker, Auteur ; Alexander Mitschke, Auteur ; Volker Dierschke, Auteur ; Philipp Schwemmer, AuteurThe lower River Elbe, including Hamburg, is part of a distribution hotspot for Mediterranean Gulls in northwest Europe. We studied local population trends and foraging behaviours of 13 adult Mediterranean Gulls breeding on a roof top at the edge[...]
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Kathrin Hueppop, Auteur ; Jochen Dierschke, Auteur ; Volker Dierschke, Auteur ; Reinhold Hill, Auteur ; Klaas Felix Jachmann, Auteur ; Ommo Hueppop, AuteurWithin a project supported by the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety dealing with possible consequences of offshore wind farms on bird migration observations of migrating birds were carried out on three [...]
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Volker Dierschke, Auteur ; Fabian Bindrich, AuteurDuring migration, many passerine birds cross the southeastern North Sea (German Bight), an only small ecological barrier (
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Julia Delingat, Auteur ; Volker Dierschke, Auteur ; Heiko Schmaljohann, Auteur ; Bettina Mendel, Auteur ; Franz Bairlein, AuteurDans Ardea (94(3) 2006)Selection for early arrival is expected to shape optimal stopover decisions in migrating birds to minimise time spent on migration. Optimality models predict that fuel loads at departure from stopover sites and stopover duration should depend st[...]
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Volker Dierschke, Auteur
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Julia Delingat, Auteur ; Volker Dierschke, Auteur ; Heiko Schmaljohann, Auteur ; Franz Bairlein, AuteurIn migrating birds body mass change during stopover is often used to evaluate the quality of a stopover site. Because such body mass changes are difficult to survey in migrating birds various methods were developed to allow the analysis of large[...]
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Stefan Garthe, Auteur ; Nicole Sonntag, Auteur ; Philipp Schwemmer, Auteur ; Volker Dierschke, AuteurIncreasing plans for economic activities at sea have recently led to intensive studies of seabird IV distribution and seabird numbers. However, there are still some temporal gaps concerning seabird numbers, and important up-to-date information i[...]
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Stefan Garthe, Auteur ; Nicole Sonntag, Auteur ; Philipp Schwemmer, Auteur ; Volker Dierschke, AuteurIncreasing plans for economic activities at sea have recently led to intensive studies of seabird IV distribution and seabird numbers. However, there are still some temporal gaps concerning seabird numbers, and important up-to-date information i[...]
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Julia Delingat, Auteur ; Volker Dierschke, AuteurDuring migratory stopovers on the small offshore island Helgoland (North Sea), Northern Wheatears equally used grassland and beach habitats in spring. An increasing proportion of wheatears present in beach habitats during autumn migration can be[...]
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Volker Dierschke, Auteur ; Stefan Garthe, Auteur ; Nele Markones, AuteurOwing to the long distances to the nearest seabird colonies in Britain and Norway, the home ranges of seabirds breeding on Helgoland (southeastern North Sea) can be investigated by transect counts at sea. According to ship-based counts from the [...]
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Volker Dierschke, Auteur ; Stefan Garthe, Auteur ; Nele Markones, AuteurOwing to the long distances to the nearest seabird colonies in Britain and Norway, the home ranges of seabirds breeding on Helgoland (southeastern North Sea) can be investigated by transect counts at sea. According to ship-based counts from the [...]
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Marcin Przymencki, Auteur ; Klaudia Litwiniak, Auteur ; Irina Samusenko, Auteur ; Anna Wlodarczak-Komosinska, Auteur ; Volker Dierschke, Auteur ; Alexander Pyshko, Auteur ; Piotr Zieliński, AuteurRooftop-nesting by Mediterranean Gulls Ichthyaetus melanocephalus is rare, with the species typically breeding on small islands in wetland areas. This paper presents details of records of rooftop nesting by Mediterranean Gulls in Russia, Belarus[...]
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Volker Dierschke, AuteurTwelve-year counts of migrating divers revealed an extrapolated annual number of 27,400 birds (>95% Red-throated Divers) passing the sea in a
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Julia Delingat, Auteur ; Keith A. Hobson, Auteur ; Volker Dierschke, Auteur ; Heiko Schmaljohann, Auteur ; Franz Bairlein, AuteurLinking events of breeding, wintering and stopover areas has important ecological and conservation implications for migratory species. To find a tool to connect these different events in a long-distance migrating songbird, the Northern Wheatear [...]
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Volker Dierschke, AuteurOn the North Sea island of Helgoland (50 km off the German Wadden Sea coast), ten raptor species occur as regular migrants, with more or less regular presence of some species in summer (Kestrel, Northern Harrier) and winter (Sparrowhawk, Common [...]
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Volker Dierschke, AuteurOut of 84,827 landbirds (at most passerines) ringed on the small offshore island Helgoland (SE North Sea) during stopovers on spring and autumn migration from 1989 to 2000, only seven were recaptured in a later migration season (1 Sparrowhawk Ac[...]
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Volker Dierschke, Auteur ; Nils Helge Lorentzen, AuteurBased on observations of 55 colour-ringed individuals the occurrence of South Norwegian Great Black-backed Gulls on the island of Helgoland (German Bight) is described. Accordingly, birds marked as chicks along the skerries of Vest-Agder (Southe[...]
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Volker Dierschke, AuteurIn October 2014, a Red Kite successfully attacked a Great White Egret foraging on grassland in a group of 28 birds in northern Lower Saxony (Germany). The attack was continued after the egret took flight until it disgorged a prey item, most prob[...]
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Volker Dierschke, AuteurHerring Gulls, which were colour-ringed as chicks on the islands of Helgoland and Mellum (SE North Sea), have been resighted on a total of
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Volker Dierschke, Auteur ; Heiko Schmaljohann, Auteur ; Annegret Walter, Auteur
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Volker Dierschke, Auteur ; Robert W. Furness, Auteur ; Stefan Garthe, AuteurThe extent to which seabirds are displaced from, or attracted to, offshore wind farms (OWFs) is uncertain, but rapid development of OWFs in European waters could conflict with seabird conservation. We review post-construction studies of seabirds[...]
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Nele Markones, Auteur ; Volker Dierschke, Auteur ; Stefan Garthe, AuteurWe assessed seasonal differences in at-sea activity of Lesser Black-backed Gulls Larus fuscus, Black-legged Kittiwakes Rissa tridactyla and Common Guillemots Uria aalge in the south-eastern North Sea. The three species correspond to different ec[...]
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Guenther Busche, Auteur ; Volker Dierschke, AuteurAt the German Bight (SE North Sea), Turtle Doves occur much more often during spring migration (including summer migrants in July) than during autumn migration, the ratio of observed individuals is 2149:96 (i.e. 96:4, years 1972-2002) for Helgol[...]
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Volker Dierschke, AuteurThe minimum annual survival of Purple Sandpipers as derived from resighting rates in a colour-ringed population at Helgoland (SE North Sea) was higher in adults (80%) than in first-year birds (36%). In both first-year and adult birds, the minimu[...]
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Volker Dierschke, AuteurDuring autumn migration stopovers on the offshore island Helgoland (North Sea), Northern Wheatears Oenanthe oenanthe varied behaviour with respect to foraging conditions. In both types of habitat studied (wrack beds along the beach, grassland), [...]
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Volker Dierschke, AuteurCompared to descriptions from the 19th century and data from the first half of the 20th century, Red-spotted Bluethroats have considerably decreased as migrants on the island of Helgoland (southeastern North Sea). At least in the last decades th[...]
