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Article
H. Hotker, Auteur ; W. Madlow, Auteur ; C. Marti, Auteur ; H. Meyer, Auteur ; H. Zang, Auteur ; N. Zbinden, AuteurSince many years, amateurs have played an important role in scientific ornithology. In this paper which is based on a symposium convened by Dachverband Deutscher Avifaunisten (DDA) on the meeting of the German Ornithologists Society in Leipzig i[...]
Article
H. Hotker, AuteurDans Ardea (90(3) 2002)Pied Avocets Recurvirostra avosetta breeding in the same colonies on the German Wadden Sea are known to winter in France, the United Kingdom and The Netherlands ('the North') or about 1000 km further south west in Portugal, SW Spain and Morocco [...]
Article
L. G. Underhill, Auteur ; J. S. Kirby, Auteur ; R. B. West, Auteur ; D. A. Scott, Auteur ; N. C. Davidson, Auteur ; L. Haanstra, Auteur ; T. Piersma, Auteur ; H. Hotker, Auteur ; D. A. Stroud, Auteur
Article
H. Hotker, Auteur ; M. Frederiksen, AuteurDans Ardea (89(3) 2001)After the breeding season Pied Avocets Recurvirostra avosetta gather at moulting sites. Counts show that some of these sites host large parts of the total population, but it is not known how many individuals use a particular site over a season ([...]
Article
H. Hotker, AuteurDans Ardea (86(1) 1998)This paper investigates factors influencing the intraspecific variability of incubation periods in Avocets Recurvirostra avosetta. The length of the incubation period of 278 clutches ranged from 19 to 34 days with an average of 23.1 days. Incuba[...]
Article
In many colonial bird species there is considerable intraspecific variation in colony size and inter-nest distance (colony density). Possible causes of this variation and its effects on hatching success (survival of eggs) and breeding success (p[...]
