| Titre : | Ostrich 70(1) - MAR 1999 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
F. Vuilleumier, Auteur
To reconstruct the spatio-temporal development of life on earth biogeographers have traditionally used several units of analysis and various kinds of data. The species has long been a fundamental unit, and a map of a species' distribution a basi[...]
Article
C. J. Bibby, Auteur
Never previously has there been such an opportunity for biologists to inform and advise environmental decision-makers. Ornithologists have a special contribution to make because of the extent and quality of the information available to us. This [...]
Article
A. A. Dhondt, Auteur ;
F. Adriaensen, Auteur
Great Tits Parus major and Blue Tits Parus caeruleus compete for food and for cavities. By providing nest boxes with entrance holes small enough to exclude Great Tits, but allowing access to Blue Tits, either by themselves or in combination with[...]
Article
Nicholas Barry Davies, Auteur
Experiments show co-evolution between the Common Cuckoo Cuculus canorus and its hosts. Both egg mimicry and laying behaviour of cuckoos have evolved in relation to host defences. In turn, host egg rejection and aggression to cuckoos have evolved[...]
Article
W. J. Bock, Auteur
Woodpeckers are the first example of adaptive evolution by Natural Selection mentioned by Darwin who commented that their 'feet, tail, beak and tongue' are 'so admirably adapted to catch insects under the bark of trees'. Over the ensuing decades[...]
Article
L. G. Underhill, Auteur
Avian demography is defined here as the study of the statistics of bird populations. Ornithology has generated types of data - or been the first discipline to generate them - which do not lend themselves to standard statistical analyses. In thes[...]
Article
A. V. Andreev, Auteur
As northern climates changed towards those existing at present, bird taxa kept evolving forms adapted to the variety of high-latitude habitats - inland, coastal and alpine. These habitats are structurally simple and dominated by dramatic seasona[...]
Article
R. E. Ricklefs, Auteur ;
E. Bermingham, Auteur
Patterns of taxonomic differentiation and geographical distribution of West Indian birds suggest that taxa may pass through phases of increasing and decreasing geographical range. Such sequences are referred to as taxon cycles. Although decline [...]
Article
S. Ishii, Auteur
I report here on novel endocrinological methods originally developed for the artificial breeding of the Japanese Crested Ibis, Nipponia nippon. According to the most recent information, the only wild population in the world is one of about 60 in[...]
Article
P. Berthold, Auteur
Theories about the evolution of migratory behaviour in birds have recently been grouped in eight categories (Rappole 1995). Common to all of them is the idea that migration originated in ancestral sedentary populations by some kind of 'behaviour[...]
