Détail de l'auteur
Documents disponibles écrits par cet auteur (18)
Ajouter le résultat dans votre panier Affiner la recherche
Article
Jochen Bellebaum, Auteur ; K. Lesley Szostek, Auteur ; Janusz Kloskowski, AuteurRed-necked Grebe (RNG) breeding numbers have been declining in parts of Europe for more than 10 years. We have examined population trends and estimated, for the first time, survival rates of RNGs in a population in eastern Poland in order to exp[...]
Article
Susanne Arbeiter, Auteur ; Angela Helmecke, Auteur ; Jochen Bellebaum, AuteurSummary Corncrakes Crex crex mainly breed in grassland, where they are threatened by mowing. Conservation requires delayed mowing or modified mowing methods. In large fields, it has been suggested that leaving strips of uncut grass may reduce mo[...]
Article
Jochen Bellebaum, Auteur ; Christoph Grueneberg, Auteur ; Johanna Karthaeuser, AuteurDuring the last 20 years our knowledge of the Corncrake breeding distribution and trends in numbers in Germany has greatly improved, despite the difficulties in surveying the species. Data from previous (1974-1995) and recent (2005-2009) breedin[...]
Article
Jochen Bellebaum, Auteur ; Wolfgang Maedlow, AuteurAdult sex ratio in ducks is male-biased, probably due to higher mortality of incubating females. In an introduced population of Mandarin Ducks Aix galericulata in Berlin and Potsdam, adult sex ratio (proportion of males) was 0.65 (95% confidence[...]
Article
Jochen Bellebaum, Auteur
Article
Jochen Bellebaum, Auteur ; Ulrich Koeppen, Auteur ; Bodo Grajetzky, AuteurEstimates of survival probabilities and reproduction in bird populations are of increasing importance for population modelling We used the free software MARK with data from the Hiddensee ringing scheme and a local colour ringing study on 110 Rob[...]
Article
Jochen Bellebaum, AuteurThe first national census of breeding Black-headed Gulls in Germany was undertaken in 1999 and the results were compared to earlier partial counts. A total of 151,400 pairs was counted in 305 colonies, showing a decline of about 25% since 1988, [...]
Article
Jochen Bellebaum, AuteurThe first national census of breeding Black-headed Gulls in Germany was undertaken in 1999 and the results were compared to earlier partial counts. A total of 151,400 pairs was counted in 305 colonies, showing a decline of about 25% since 1988, [...]
Article
Ramunas Zydelis, Auteur ; Jochen Bellebaum, Auteur ; Henrik Osterblom, Auteur ; Markus Vetemaa, Auteur ; Bernd Schirmeister, Auteur ; Antra Stipniece, Auteur ; Mindaugas Dagys, Auteur ; Mennobart van Eerden, Auteur ; Stefan Garthe, AuteurBird mortality in fishing gear is a global conservation issue and it is recognised that bycatch in industrial longline and trawl fisheries threatens several seabird species. Little is known however about the effects of bycatch in small-scale gil[...]
Article
Jochen Bellebaum, Auteur ; Jan Kube, Auteur ; Axel Schulz, Auteur ; Henrik Skov, Auteur ; Helmut Wendeln, AuteurAbundance of Long-tailed Ducks Clangula hyemalis wintering in the Pomeranian Bay was monitored between 1988 and 2014, using both ship-based and aerial surveys and correcting for distance dependent detection. Aerial surveys were conducted using a[...]
Article
Jochen Bellebaum, Auteur ; Martin Boschert, AuteurIn order to determine causes of nest losses in ground-breeding birds, distinctive characteristics of clutches successfully hatched as well as clutches destroyed by various predators and those lost due to other causes are described. The informati[...]
Article
Jochen Bellebaum, Auteur ; Martin Boschert, AuteurIn order to determine causes of nest losses in ground-breeding birds, distinctive characteristics of clutches successfully hatched as well as clutches destroyed by various predators and those lost due to other causes are described. The informati[...]
Article
Jochen Bellebaum, AuteurSeasonal occurence and success of first and second broods were investigated in two Coot populations in Westphalia (North-West Germany) 1992-1995. In the seminatural Lippe valley second broods occurred only in one of three years. Among the popula[...]
Article
Jochen Bellebaum, Auteur ; Christoph Bock, AuteurInsufficient productivity has driven population declines in grassland breeding waders with high levels of predation limiting productivity in many wetland reserves. We studied hatching and fledging success of Lapwings Vanellus vanellus in two con[...]
Article
Jochen Bellebaum, Auteur ; Christoph Bock, Auteur ; Stefan Garthe, Auteur ; Jan Kube, Auteur ; Marco Schilz, Auteur ; Nicole Sonntag, AuteurStandardised seabird surveys from ships and systematic counts of migrating birds in the German Baltic Sea from 2002 to 2008 revealed a regular occurrence of White-billed Divers mainly on spring migration (March to May). Migration intensity was 0[...]
Article
Jochen Bellebaum, Auteur
Article
Franziska Tanneberger, Auteur ; Jochen Bellebaum, Auteur ; Thomas Fartmann, Auteur ; Hans-Jochen Haferland, Auteur ; Angela Helmecke, Auteur ; Peter Jehle, Auteur ; Peter Just, Auteur ; Joachim Sadlik, AuteurIn the last German breeding area of the rapidly declining "Pomeranian" population of the Aquatic Warbler (Acrocephalus paludicola), the Lower Oder Valley National Park, we investigated changes in habitat suitability between 1993 and 2006 by comb[...]
Article
Jochen Bellebaum, Auteur ; Andreas Buchheim, Auteur ; Joerg Nowakowski, Auteur ; Michael Sell, AuteurSince c. 1968 large numbers of gulls winter in the Ruhr district, a highly industrialized urban landscape, where gulls forage mainly on refuse dumps. While refuse production rose, January numbers of Herring Gulls exceeded 8,000 in 1989 - 1995. A[...]
