Détail de l'auteur
Auteur Ulrich Koeppen |
Documents disponibles écrits par cet auteur (8)
Ajouter le résultat dans votre panier Affiner la recherche![]()
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
Naomi Itonaga, Auteur ; Ulrich Koeppen, Auteur ; Martin Plath, Auteur ; Dieter Wallschlaeger, AuteurFollowing a steep decline, White Stork Ciconia ciconia populations in Germany are currently increasing, allowing us to examine potential density-dependent effects on breeding dispersal. Our data suggest that the proportion of breeding dispersers[...]![]()
Article
Fraenzi Korner-Nievergelt, Auteur ; Annette Sauter, Auteur ; Philip W. Atkinson, Auteur ; Jerome Guelat, Auteur ; Wojciech Kania, Auteur ; Marc Kéry, Auteur ; Ulrich Koeppen, Auteur ; Robert A. Robinson, Auteur ; Michael Schaub, Auteur ; Kasper Thorup, Auteur ; Henk van der Jeugd, Auteur ; Arie J. van Noordwijk, AuteurRing re-encounter data, in particular ring recoveries, have made a large contribution to our understanding of bird movements. However, almost every study based on ring re-encounter data has struggled with the bias caused by unequal observer dist[...]![]()
Article
Peter Suedeck, Auteur ; Bernd Haelterlein, Auteur ; Wilfried Knief, Auteur ; Ulrich Koeppen, AuteurIn 1995, 7557 breeding pairs of Common Tern and 7329 pairs of Arctic Tern were counted along the German coasts. This is over 25 % less than in a similar survey 1939 (SCHULZ, 1947). The population development of each species is described separate[...]![]()
Article
Bernd Haelterlein, Auteur ; Peter Suedbeck, Auteur ; Wilfried Knief, Auteur ; Ulrich Koeppen, AuteurThe German coasts of the North and the Baltic Sea represent important breeding grounds for several bird species with high proportions of the![]()
Article
Ulrich Koeppen, Auteur ; Alexander Petrovich Yakovlev, Auteur ; Raimund Barth, Auteur ; Michael Kaatz, Auteur ; Peter Berthold, AuteurThe Kyrgyz population of the bar-headed goose Anser indicus has declined dramatically during the past decades. Human persecution during migration and habitat loss at stopover and wintering sites are commonly regarded as most serious threats. How[...]



