| Titre : | Journal of Avian Biology 42(6) - NOV 2011 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Adrian Surmacki, Auteur ;
Mark Liu, Auteur ;
Austin Mercadante, Auteur ;
Geoffrey E. Hill, Auteur
We used observations of male eastern bluebirds captured twice within a breeding season to test whether changes in structural coloration are related to feather abrasion. Between first and second broods, the UV chroma and brightness of feathers de[...]
Article
Simon C. Griffith, Auteur ;
Emma C. Pariser, Auteur ;
Barbara Tschirren, Auteur ;
Lee B. Astheimer, Auteur
Zebra finches have played a central role in the discovery of a variety of maternal effects over the past decade, with females shown to adjust resource allocation to their eggs in response to variables such as the appearance of their partner, the[...]
Article
Golo Maurer, Auteur ;
Steven J. Portugal, Auteur ;
Phillip Cassey, Auteur
Current research into the evolution and adaptive function of avian eggshell pigmentation, including maculation, has focused mostly on signalling-based and structural function hypotheses but ignored the potential consequences of shell pigmentatio[...]
Article
Ismael Galvan, Auteur
Feather microstructure affects the light absorbed by plumage pigments. However, the effect of particular elements of feather microstructure on the expression of pigmentary colours or on the size of colour patches has never been investigated. Her[...]
Article
Michal Vinkler, Auteur ;
Tomáš Albrecht, Auteur
Immunocompetence is a term used in avian immunological ecology to refer to the ability of an individual to overcome potential parasite infections. However, there are multiple ecological definitions of this term currently used and all of them are[...]
Article
Wolfgang Goymann, Auteur ;
Meta M. Landys, Auteur
Past studies have suggested a fundamental difference in testosterone concentrations between tropical and northern latitude male birds, with the convention being that males in the tropics express much lower levels of testosterone. However, recent[...]
Article
Robert E. Ricklefs, Auteur ;
Julia Dodge Gray, Auteur ;
Steven C. Latta, Auteur ;
Maria Svensson-Coelho, Auteur
We compared the haemosporidian parasite faunas (Plasmodium and Haemoproteus) of small land birds on the islands of St Lucia, St Vincent and Grenada in the southern Lesser Antilles. The islands differ in distance from the South American source of[...]
Article
Aleksi Lehikoinen, Auteur ;
Tatu Hokkanen, Auteur ;
Heikki Lokki, Auteur
Irruptive migrants often show biased sex and age ratio, and typically young females are the most abundant class participating in irruptions. Several hypotheses have been proposed to explain differential migration in birds. We examined these hypo[...]
Article
Carlos Navarro, Auteur ;
Tomas Perez-Contreras, Auteur ;
Jesus M. Aviles, Auteur ;
Kevin J. McGraw, Auteur ;
Juan J. Soler, Auteur
The hypothesis that eggshell colouration is a sexually selected trait of female birds is based on the fact that biliverdin, the pigment responsible for blue-green colours of the eggshell, is a potent antioxidant and that only females with high a[...]
Article
Ville Vasko, Auteur ;
Toni Laaksonen, Auteur ;
Jari Valkama, Auteur ;
Erkki Korpimäki, Auteur
Costs and benefits of dispersal can vary in space and time, depending on environmental factors and individual state. Plastic, condition-dependent dispersal strategies, in which individuals rely on external cues such as food abundance to adjust t[...]
Article
Muhammad Asghar, Auteur ;
Dennis Hasselquist, Auteur ;
Staffan Bensch, Auteur
One group of commonly found parasites in birds, for which fitness consequences and effects on life history traits have been much debated are Haemosporidian blood parasites. In a long term study population of great reed warblers Acrocephalus arun[...]
Article
Alastair Franke, Auteur ;
Jean-François Therrien, Auteur ;
Sebastien Descamps, Auteur ;
Joel Bety, Auteur
In long-lived species, population growth rate is highly sensitive to changes in adult survival. Despite the growing concerns regarding recent climate changes, few studies have investigated the effect of climatic conditions on survival in long-li[...]
Article
David D. Hope, Auteur ;
David B. Lank, Auteur ;
Barry D. Smith, Auteur ;
Ronald C. Ydenberg, Auteur
The effects of relative fuel load on migration speed and on vulnerability have been investigated, but the effects of seasonal variation in predation danger on the amount of fuel and duration of stopover have not been considered. We analyzed seas[...]
Article
Kyle A. Cutting, Auteur ;
Keith A. Hobson, Auteur ;
Jay J. Rotella, Auteur ;
Jeffrey M. Warren, Auteur ;
Susan E. Wainwright-de la Cruz, Auteur ;
John Y. Takekawa, Auteur
Lesser scaup Aythya affinis populations have declined throughout the North American continent for the last three decades. It has been hypothesized that the loss and degradation of staging habitats has resulted in reduced female body condition on[...]
