| Titre : | Journal of Avian Biology 39(2) - MAR 2008 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Peter Sunde, Auteur
In species defending territories, fitness of newly independent juveniles could depend on phenotypic quality or early access to vacant resources as a result of rapid dispersal. In the first case, parent-offspring conflict will arise when parents [...]
Article
Heiko Schmaljohann, Auteur ;
Felix Liechti, Auteur ;
Bruno Bruderer, Auteur
Lesser black-backed gulls Larus fuscus migrate regularly along coastlines or the Nile to their wintering grounds in sub-Saharan Africa. They usually avoid the interior of the Sahara, but occur occasionally far inland when moving upstream along r[...]
Article
Jesus M. Aviles, Auteur ;
Elena Solis, Auteur ;
Juliana Valencia, Auteur ;
Carlos de la Cruz, Auteur ;
Gabriele Sorci, Auteur
Animals may assess the quality of other individuals by using information that is contained in elaborate traits. We investigated the degree of sexual dimorphism in structural blue plumage coloration and the potential signal value of these traits [...]
Article
Kristne Igaune, Auteur ;
Indriķis Krams, Auteur ;
Tatjana Krama, Auteur ;
Jadviga Bobkova, Auteur
Mating calls of animals are often detected by unintended receivers which use sexual signals to obtain information about the signaller. We investigated whether white storks Ciconia ciconia can eavesdrop mating calls of moor frogs Rana arvalis. Wh[...]
Article
Raul Bonal, Auteur ;
Jose M. Aparicio, Auteur
Predation may reduce prey numbers in such extent that prey may be depleted, which has negative effects on predator populations. Prey depletion would be more likely when the number of predators increase and/or concentrate their activity in a cert[...]
Article
Christin L. Pruett, Auteur ;
Kevin Winker, Auteur
To empirically determine the effects of sample size on commonly used measures of average genetic diversity, we genotyped 200 song sparrows Melospiza melodia from two populations, one genetically depauperate (n=100) and the other genetically dive[...]
Article
Vincenzo Penteriani, Auteur ;
Maria del Mar Delgado, Auteur ;
Paola Bartolommei, Auteur ;
Carlotta Maggio, Auteur ;
Carlos Alonso-Alvarez, Auteur ;
Graham J. Holloway, Auteur
The interactions among the multiple factors regulating predator-prey relationships make predation a more complex process than previously thought. The degree to which substandard individuals are captured disproportionately seems to be better a fu[...]
Article
Within-season variation in life-history parameters is characteristic of long-lived seabirds breeding in dynamic marine environments. Zooplanktivorous Cassin's auklets Ptychoramphus aleuticus breeding in central California feed primarily on eupha[...]
Article
Cyril Eraud, Auteur ;
Adrien Dorie, Auteur ;
Anne Jacquet, Auteur ;
Bruno Faivre, Auteur
Allocation of carotenoid pigments, either through nutritional provisioning or from endogenous reserves, makes up a form of non-genetic parental investment to progeny that may contribute to fitness. To date, carotenoids derived from endogenous re[...]
Article
Silke Laucht, Auteur ;
Emily H. DuVal, Auteur ;
Bart Kempenaers, Auteur
Theory predicts that overall population sex ratios should be around parity. But when individual females can receive higher fitness from offspring of one sex, they may benefit by biasing their brood sex ratios accordingly. In lekking species, hig[...]
Article
Heather Bears, Auteur ;
C. Drever, Auteur ;
Kathy Martin, Auteur
Morphologies of bird species often vary along elevation gradients, yet causes of the variation have not been examined experimentally. We investigated variation in morphological traits of the dark-eyed junco Junco hyemalis, breeding at 1,000 m a.[...]
Article
Arne Moksnes, Auteur ;
Eivin Roskaft, Auteur ;
Geir Rudolfsen, Auteur ;
Sigrun Skjelseth, Auteur ;
Bard G. Stokke, Auteur ;
Oddmund Kleven, Auteur ;
H. Lisle Gibbs, Auteur ;
Marcel Honza, Auteur ;
Barbara Taborsky, Auteur ;
Yvonne Teuschl, Auteur ;
Wolfgang Vogl, Auteur ;
Michael Taborsky, Auteur
Females of the obligate brood parasitic common cuckoo Cuculus canorus are assumed to lay eggs of consistent colour and pattern and egg characteristics have been used to separate between different individuals. We tested the "constant egg-type hyp[...]
Article
Lucinda H. Male, Auteur ;
Tom V. Smulders, Auteur
Many animals use hoarding as a long-term strategy to ensure a food supply at times of shortage. We suggest that long-term scatter hoarders, whose caches are vulnerable to potentially high pilferage, should hoard in ways to reduce cache loss. Thi[...]
Article
Ann E. Edwards, Auteur
Laysan and black-footed albatrosses, Phoebastria immutabilis and P. nigripes, exhibit both annual and biennial breeding frequencies, and annually replace flight feathers in patterns that can be described as large, small or medium in extent. Larg[...]
Article
Yoav Perlman, Auteur ;
Ido Tsurim, Auteur
Trading-off food and safety is considered a predominant component of foraging behavior. We examined whether predators' response to potential prey is state-dependent, and suggest that risk of injury while pursuing the prey affects the predators' [...]
Article
Stephen A. Oswald, Auteur ;
Stuart Bearhop, Auteur ;
Robert W. Furness, Auteur ;
Brian Huntley, Auteur ;
Keith C. Hamer, Auteur
Birds such as great skuas Catharacta skua adapted for successful breeding at high latitudes may experience problems of heat dissipation in mild climates. Great skuas spend time bathing at freshwater sites close to breeding territories and here, [...]
Article
Shinichi Nakagawa, Auteur ;
Terry Burke, Auteur
In many species, females prefer older males as social and genetic mates, and male secondary sexual traits often act as age indictor mechanisms. It has been reported that almost all the extra-pair paternity in one population and recently in anoth[...]
Article
Hugh Drummond, Auteur ;
Cristina Rodriguez, Auteur ;
Hubert Schwabl, Auteur
We examined androgens in clutches of two booby species that differ in their sibling conflict. Blue-footed booby Sula nebouxii chicks show an aggression-submission relationship, aggression is normally moderate and siblicide is facultative. Brown [...]
Article
Tadeusz Zając, Auteur ;
Wojciech Solarz, Auteur ;
Wojciech Bielański, Auteur
During nine years of study, we detected a mechanism corresponding to site dependence operating in a population of the sedge warbler Acrocephalus schoenobaenus inhabiting a natural wetland of high within-habitat heterogeneity. Sites with a larger[...]
Article
Thord Fransson, Auteur ;
Christos Barboutis, Auteur ;
Roger Mellroth, Auteur ;
Triantaphyllos Akriotis, Auteur
Large numbers of passerine migrants cross the Sahara desert every year on their way to-and-from wintering areas in tropical Africa. In the desert, hardly any fuelling opportunities exist and most migrants have to prepare in advance. A central qu[...]
Article
Adele Mennerat, Auteur ;
Philippe Perret, Auteur ;
Samuel P. Caro, Auteur ;
Philipp Heeb, Auteur ;
Marcel M. Lambrechts, Auteur
Nesting birds use several behavioural or physiological defence mechanisms against parasites. On Corsica, female blue tits Cyanistes caeruleus incorporate fresh fragments of a limited number of aromatic plants in the nest cup, from the end of nes[...]
Article
Maaike E. de Heij, Auteur ;
Richard Ubels, Auteur ;
G. Henk Visser, Auteur ;
Joost M. Tinbergen, Auteur
Several studies have shown that enlargement of clutches during incubation reduces the long-term survival of parents. In line with these findings, studies on the energetic costs of nocturnal incubation show an increase in energy expenditure with [...]
