| Titre : | Journal of Avian Biology 29(4) - DEC 1998 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
B. Bruderer, Auteur ;
F. Liechti, Auteur
Numerous reports on homogeneous streams of nocturnal migrants over land and water, crossing coastlines without taking any notice of the habitat change underneath, seem to contradict recent infrared observations along the French and Spanish Medit[...]
Article
G. R. Spedding, Auteur ;
P. B. S. Lissaman, Auteur
Micro Air Vehicles (MAVs) have excellent potential utility as flight platforms for optical, acoustic, electronic and chemical sensors for operation in hazardous sites with aerial access. The dimensions and performance specifications call for a 1[...]
Article
A. Kvist, Auteur ;
M. Klaassen, Auteur ;
A. Lindstrom, Auteur
The relationship between mass loss rate and chemical power in Eying birds is analysed with regard to water and heat balance. Two models are presented: the first model is applicable to situations where heat loads are moderate, i.e. when heat bala[...]
Article
Understanding bird night and migration depends on field observations, theory and laboratory experiments. Like the legs of a tripod, these three elements depend on each other for support. No one leg can be extended too far beyond the others, with[...]
Article
W. Nachtigall, Auteur
The paper contains three parts. (A) A short description is given on the development of the bird Eight wind-tunnel technology in my Munchen and Saarbrucken labs; three tunnels especially adapted for the study of pigeon Eight and of starling fligh[...]
Article
The changes in global climate, vegetation zones and sea level must have resulted in changes in the routes taken by migratory species. I consider whether populations are likely to be able to adapt to the accelerating change resulting from modific[...]
Article
A. Hedenstrom, Auteur ;
T. Alerstam, Auteur
Bird migration is typically characterized by periods of flight, when fuel is consumed, and intervening stopover periods when fuel is deposited. The resulting overall migration speed can be calculated on the basis of flight speed, rate of Furl de[...]
Article
M. R. Fuller, Auteur ;
W. S. Seegar, Auteur ;
L. S. Schueck, Auteur
We describe and compare the migration routes, length of migration, and duration of migration of Peregrine Falcons Falco peregrinus tundrius and Swainson's Hawks Buteo swainsoni in the Western Hemisphere. We radio tracked migrants using the Argos[...]
Article
J. M. McNamara, Auteur ;
R. K. Welham, Auteur ;
A. I. Houston, Auteur
We illustrate how a general technique for finding optimal cyclic routines can be applied to annual routines of migration. We present a schematic model in which there are two locations that differ in terms of food availability. We demonstrate how[...]
Article
A. H. Farmer, Auteur ;
J. A. Wiens, Auteur
We developed a dynamic state variable model of individual migrating shorebirds for use in testing hypotheses about spring migration strategies of the pectoral Sandpiper Calidris melanotos. We conducted model sensitivity analyses to determine how[...]
Article
S. Akesson, Auteur ;
T. Alerstam, Auteur
The possibility that albatrosses use a geomagnetic bi-coordinate map for long-distance navigation at sea was investigated by evaluating how five different geomagnetic parameters (i.e. total field intensity, horizontal and vertical field intensit[...]
Article
A. I. Houston, Auteur
Taking as my starting point the paper by Alerstam and Lindstrom (1990), I review models of optimal foraging and fuel loads during avian migration. As well as summarising previous results, I highlight topics where further work is required. I argu[...]
Article
W. Wiltschko, Auteur ;
P. Weindler, Auteur ;
R. Wiltschko, Auteur
Cage experiments with various species of migrating passerines indicate two distinct phases in migratory orientation in which magnetic and celestial cues interact in different ways. The first phase during the premigratory period involves the conv[...]
Article
R. M. Alexander, Auteur
An animal that migrates may travel to an area where the hazards of winter are less severe than in the breeding area, or where the food supply is better, but the journey may be danger ous and its energy cost May be high. Simple conditions are pre[...]
Article
G. A. Gudmundsson, Auteur ;
T. Alerstam, Auteur
Little attention has been given to the types of maps used in migration studies. However, we think that analyses of migration in two dimensions by applying different map projection rules may give valuable insights about biological control program[...]
Article
R. Wehner, Auteur
Among the movements of animals across the surface of our planet, the wide-ranging migratory journeys of birds and the smaller-scale foraging excursions of social (hymenopteran) insects provide some of the most intriguing examples of biological s[...]
Article
K. J. Lohmann, Auteur ;
C. M. F. Lohmann, Auteur
Hatchling sea turtles emerge from underground nests, scramble to the ocean, and migrate to the open sea. Loggerhead Caretta caretta hatchlings from eastern Florida, U.S.A., appear to use three different sets of orientation cues sequentially as t[...]
Article
T. Alerstam, Auteur ;
A. Hedenstrom, Auteur
The full magnitude and complexity of bird migration have not been possible to grasp until after the revolutionary discoveries made with the aid of, e.g., ringing, systematic field observations and radar. These have opened up opportunities for a [...]
Article
B. A. Nolet, Auteur ;
R. H. Drent, Auteur
Current models of bird migration consider the optimal decision making of individuals irrespective of the behaviour of conspecifics. We observed the foraging behaviour of Bewick's Swans Cygnus columbianus during their stop-over in the Dvina Bay i[...]
Article
T. Fransson, Auteur
Whitethroats at a coastal autumn stopover site were supplied with mealworms arl libitum and their fuel accumulation rates were recorded by repeated weighings by means of a remote-controlled balance. This study focuses on two questions: (1) How d[...]
Article
F. Liechti, Auteur ;
B. Bruderer, Auteur
Tracking radar measurements of winds at the Eight levels of bird migration during several migratory seasons in central Europe, southern Israel and the western Mediterranean are analysed with regard to optimal migratory behaviour in relation to w[...]
Article
R. Sandberg, Auteur ;
B. Holmquist, Auteur
By computer simulations of different Eight routes for spring migrating Knots Calidris canutus, potential orientational 'danger zones' were revealed in the equator area and north of the Arctic circle. An evaluation of the availability of directio[...]
Article
F. Bairlein, Auteur
Prior to migration, many migratory birds accumulate large stores of lipids as the prime energy for their migratory flights. Although this phenomenon is well known, comparatively little is known about the mechanisms of fat accumulation, and the n[...]
Article
T. P. Weber, Auteur ;
T. Alerstam, Auteur ;
A. Hedenstrom, Auteur
Despite evidence that wind conditions are ail important factor in determining stopover decisions, models of time-minimizing bird migration have up to now emphasized the optimal response of the migrants to variations in fuel acquisition rates. We[...]
Article
H. Biebach, Auteur
During long-distance migration, passerine birds alternate between Eight and stopover phases. Flight phases can last one to three consecutive nights with rest during the days; stopover phases last one to three weeks. During long flight phases, su[...]
Article
T. Alerstam, Auteur ;
A. Hedenstrom, Auteur
Article
P. J. Butler, Auteur ;
A. J. Woakes, Auteur ;
C. M. Bishop, Auteur
Few studies of Night physiology have used birds that are in the migratory state. Thug we obtained behavioural and physiological data from a group of Svalbard Barnacle Geese before and during the autumn migration from their breeding area around N[...]
Article
T. Piersma, Auteur
Avian long-distance migration involves the storage and expenditure of very large fuel loads. Birds may double in weight before take-off on flights of many 1000 km, and they may lose half their body mass over the subsequent few days that such tri[...]
Article
L. Jenni, Auteur ;
S. Jenni-eiermann, Auteur
Energy management for endurance flight critically determines the ecological options in the life history of migrant birds. Apart from the amount of energy stores, the types of fuel used and metabolic constraints determine endurance performance in[...]
Article
A. L. R. Thomas, Auteur ;
A. Hedenstrom, Auteur
Conventional models of bird Eight combine metabolic, mechanical, and aerodynamic components to calculate the rate of fuel consumption and power required for flight, from which we may derive the optimal speeds Eying animals should use in differen[...]
