| Titre : | Journal of Ornithology 142(2) - APR 2001 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
S. Toepfer, Auteur ;
M. Stubbe, Auteur
The Skylark (Alauda arvensis) is one of the most common birds in German farmlands. Recently populations declined rapidly in some regions. This new situation demands further research on the ecology and behaviour of this species. In particular, th[...]
Article
J. Flasbarth, Auteur
During the 133. International Annual Meeting of the German Ornithologists Society held in Leipzig, the author, president of NABU, the German partner of BirdLife International, showed the importance of ornithology for nature conservation during t[...]
Article
H. Ballasus, Auteur
Based on frequent goose counts, data are presented on abundance and spatial distribution of White-fronted Geese wintering in the north-western part of the Lower Rhine area, North Rhine Westfalia, FRG, in an area of about 117 km(2). In accordance[...]
Article
E. Bezzel, Auteur
In Central Europe all the different types of landscape are more or less totally exploited or will be influenced by human impacts in near future. Short-term processes rather than Longterm steady states will therefore influence bird numbers. This [...]
Article
T. Zollner, Auteur
From 1996 to 2000 43 male and 58 female Lapwings were observed from March Ist until June 15th. During 79 full day observations over a total of 1109 hours, 767 copulations were recorded. Viewed over the whole breeding period a copulation took on [...]
Article
Bird migration: a novel theory for the evolution, the control and the adaptability of bird migration
P. Berthold, Auteur
The migratory behaviour of many bird species is currently changing, evidently in connection with global warming; in general there is a shift towards sedentariness. Because experimental studies indicate that all crucial aspects of migration are u[...]
Article
H. H. Bergmann, Auteur ;
W. Engländer, Auteur ;
V. U. Arkhipov, Auteur
At the Ochotskian sea coast Thin-billed Eurasian Nutcrackers (Nucifraga caryocatactes macrorhynchos) harvested seeds of ripe cones of the brush pine Pinus pumila in late summer. The mean number of seeds carried in their sublingual pouch was 80, [...]
Article
Research on orientation is highlighted by the discovery of the sun-, star-, and magnetic compasses with many additional details, vector navigation with many details, and the concept of map and compass. German researchers contributed considerably[...]
Article
R. Prinzinger, Auteur
Article
A. Feduccia, Auteur
First discovered in 1860, Archaeopteryx has played a prominent role in discussions of avian origin especially during the 20(th) century. One of the most dramatic discoveries in modern ornithology involved the revelation of a completely new Glade[...]
Article
W. J. Bock, Auteur
Even with today's rapid communications, scientific advancements develop strikingly differently in various parts of the world so that it is often possible to trace the unfolding of a particular subject in one location and its subsequent spread to[...]
Article
J. A. Martinez, Auteur ;
I. Zuberogoitia, Auteur
The Eagle Owl (Bubo bubo) is a generalist predator that in Mediterranean areas feeds mainly on Rabbits (Oryctolagus cuniculus) At the end of 1997, a local outbreak of the rabbit haemorrhagic disease (RHD) decimated Rabbit populations in the area[...]
Article
W. Müller, Auteur ;
J. T. Epplen, Auteur ;
T. Lubjuhn, Auteur
Previous studies have shown that extra-pair fertilizations are much less frequent in Non-Passeriformes, especially in raptors, than in Passeriformes. Low breeding densities, high breeding synchrony and high rates of paternal effort have been dis[...]
Article
S. Zehnder, Auteur ;
L. Karlsson, Auteur
In autumn 1998, nocturnal bird migration at Falsterbo was recorded over a period of three months by means of a passive infrared device. At the same place a standardised trapping scheme is in operation. This study reveals for the first time a pos[...]
Article
Christian Jouanin, Auteur ;
F. Roux, Auteur ;
J. L. Mougin, Auteur ;
J. C. Stahl, Auteur
We stayed on the Portugese island of Selvagem Grande, 30 degrees N 16 degrees W, 300 km south of Madeira and 200 km north of Tenerife, from 9 May to 3 June 1991 in order to study the prelaying exodus in Gory's Shearwaters (Calonectris diomedea b[...]
