| Titre : | Ardea 90(2) - FAL 2002 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
M. Marchesan, Auteur
The operational sex ratio (OSR) is the ratio of fertilisable females to sexually active males in a population. The aim of this study was to determine the i effects of OSR variations on pair bond dynamics and on the level of sperm competition in [...]
Article
D. Boertmann, Auteur ;
C. Egevang, Auteur
Numbers of Greenland White-fronted Geese Anser albifrons flavirostris in two Ramsar-sites in West Greenland seemed to be unaffected of increasing numbers of Canada Geese Branta canadensis.
Article
S. Komenda-Zehnder, Auteur ;
F. Liechti, Auteur ;
B. Bruderer, Auteur
About 23 000 tracks of individual nocturnal migrants and density measurements in 131 nights were recorded by tracking radar at two sites in Israel during autumn 1991 and spring 1992. We used this data to analyse the occurrence of reverse migrati[...]
Article
B. Faivre, Auteur ;
J. Secondi, Auteur ;
B. Frochot, Auteur ;
F. Cezilly, Auteur
Demographic studies were conducted in Burgundy (eastern France) on the Melodious Warbler Hippolais polyglotta. This species has been expanding in Europe since the beginning of the 1960s. Over a three-year period, mean clutch size was 4.47 eggs. [...]
Article
A. B. Van Den Burg, Auteur
Avian eggs are subject to hatching failure, the extent of which varies among species. Eurasian Sparrowhawks show on average 10% less hatching failures than Barn Owls. The difference in hatching success between these species may, among others, or[...]
Article
N. M. Groen, Auteur ;
L. Hemerik, Auteur
During a monitoring study from 1984-87, a population of 70-95 breeding pairs of the Black-tailed Godwit Limosa limosa and their offspring were observed. Clutch size, fraction hatched, fledging probability, first year survival and the yearly resi[...]
Article
P. Tryjanowski, Auteur ;
S. Kuzniak, Auteur
We studied population size and productivity of White Storks Ciconia ciconia in 1983-2000 in 417 km(2) of the Obra river valley in western Poland and its response to Common Vole Microtus arvalis density. The 33 to 60 nesting pairs fluctuated in c[...]
Article
J. M. Ward, Auteur ;
J. D. Blount, Auteur ;
G. D. Ruxton, Auteur ;
D. C. Houston, Auteur
Since Buxton's (1923) observation that many animals inhabiting desert environments exhibit black pelage, various hypotheses have been proposed to explain the evolutionary origins of this phenomenon. In this review, these hypotheses are examined [...]
Article
S. Herrando, Auteur ;
L. Brotons, Auteur ;
R. del Amo, Auteur ;
S. Llacuna, Auteur
Animal succession and restoration of community structure after fire are related to vegetation regeneration, which is influenced by climate. As the thermo-Mediterranean life zone is characterised by stronger dryness conditions than other Mediterr[...]
Article
A. McGowan, Auteur ;
W. Cresswell, Auteur ;
G. D. Ruxton, Auteur
We studied Red Knot Calidris canutus foraging on intertidal mudflats that were subject to attacks by Peregrine Falcons Falco peregrinus. Foraging rate and position with respect to cover that a predator might use was unaffected by weather, but re[...]
Article
C. P. F. Redfern, Auteur ;
G. W. Douglas, Auteur ;
T. A. Halliday, Auteur
Redwings which died by flying into a lighthouse off North Wales, UK, while on migration were used to examine the relationship between fat levels and intestine size. The weight of claviculo-coracoid fat was used as a measure of relative fat level[...]
Article
S. L. Hazlitt, Auteur ;
R. C. Ydenberg, Auteur ;
D. B. Lank, Auteur
We investigate parental food provisioning and chick growth to better understand how parental effort and territory structure relate to reproductive success in the American Black Oystercatcher. American Black Oystercatcher chick diet was comprised[...]
Article
A. Exnerova, Auteur ;
V. Jarosik, Auteur ;
A. Kristin, Auteur
The variation in foraging behaviour was investigated in the Northern Wheatear Oenanthe oenanthe in three structurally different habitats: early succession stages of spoil-banks, suburban wastelands, and grasslands. In each habitat, data were col[...]
Article
J. Stahl, Auteur ;
D. Bos, Auteur ;
MJJE Loonen, Auteur
We report on the effects of salt deposition on food plants on the foraging preferences of Dark-bellied Brent Branta bernicla and Barnacle Geese B. leucopsis in a coastal staging habitat. Within one salt-marsh plant community, dominated by Red Fe[...]
Article
A. Roulin, Auteur
During a 12-year study of the Barn Owl Tyto alba I investigated the short- and long-term fitness correlates of hatching date, brood size and hatching rank. Observations showed that nestling survival was lower at the end of the breeding season an[...]
