Wilsons Storm-petrel (Oceanites oceanicus) Science Article 4 abstract Captive Wilsons’ storm-petrels (Oceanites oceanicus) fed a diet of pure wax (hexadecyl oleate) or triacylglycerol (olive oil) increased in body mass or lost mass moreslowly than birds given only water, depending upon the quantity of lipid they were fed. BRYAN S. OBST, Wilson Bull., 98(2), 1986, pp. […]
FIRST RECORD OF WILSONS PHALAROPE, PHALAROPUS TRICOLOR, FOR TOBAGO
Wilsons Phalarope (Phalaropus tricolor) Science Article 1 abstract On 28 September 1990, Charles and Betty Crabtree, Andrew Cunningham, Faye Barnes, Mary Hurd, and the authors discovered a Wilson’s Phalarope (Phalaropus tricolor) at Buccoo Marsh, Tobago, West Indies William L. Murphy, Trevor Yip Hoi and Adolphus James, J. Soc. Conserv. Study Carib. Birds) 4(2):2-3 Download article […]
Progress with the statistical analysis of primary molt
Willow Warbler (Phylloscopus trochilus) Science Article 1 abstract This paper considers two extensions to the statistical analysis of primary molt. The first extension relates to thedevelopment of statistical models that allow the simultaneous estimation of molt parameters for diverse groups of birds.Parameter estimation uses the method of maximum likelihood and the EM algorithm. The likelihood […]
Niche partitioning of two Palearctic passerinemigrants with Afrotropical residents in theirWest African winter quarters
Willow Warbler (Phylloscopus trochilus) Science Article 2 abstract In bird migration systems, the question of coexistence and competition of migrants with residents in the nonbreeding season andtheir role in shaping the evolution of present avian communities is much debated. However, conclusions are often drawn ina speculative way. In the Palearctic-African bird migration system, many studies […]
Spring passage of Willow Warbler Phylloscopus trochilusacross the western Mediterranean:comparing islands with the mainland
Willow Warbler (Phylloscopus trochilus) Science Article 4 abstract Spring migration of Willow Warbler Phylloscopus trochilus over the western Mediterranean was studied using observations collected at a ringing station on the mainland of Spain (Aiguamolls de l’Emporda), and at an island station (Cabrera, one of the Balearics). During the years 1993-2001, birds were caught and measured […]
Intraspecific variation in sperm length in two passerine species, the Bluethroat Luscinia svecica and the Willow Warbler Phylloscopus trochilus.
Willow Warbler (Phylloscopus trochilus) Science Article 3 abstract Sperm cells are highly diversified in birds and considerable research effort has focused on variation in sperm morphology between species. However, surprisingly little is known about intraspecific variation in sperm morphology in birds. We analyzed between- and within-male variation in total sperm length in two passerine species, […]
Growth and size of Willow Tit Parus montanus under different environmental conditions
Willow Tit (Parus montanus) Science Article 1 abstract This six years study focuses on the effect of environmental factors on Willow Tit (Parus montanus) nestling growth . For each brood, nestling growth during the growth period (day 1-12) was related to the amount of food and temperature du ring this peri od as well as […]
Factors influencing Willow Tit Poecile montanus site occupancy: a comparison of abandoned and occupied woods
Willow Tit (Parus montanus) Science Article 4 abstract The British Willow Tit Poecile montanus kleinschmidti underwent a decline of 85% between 1970 and 2003. The cause of this decline is unknown. However, several hypotheses have been put forward to account for it: competition from other tit species, predation by Great Spotted Woodpeckers Dendrocopos major and […]
Hunger-dependency of hiding behaviour after a predator attack in dominant and subordinate Willow Tits.
Willow Tit (Parus montanus) Science Article 3 abstract We studied rank-specificity of predation risk taking in captive Willow Tits Parus montanus. Level of risk taking was expressed by duration of hiding after a simulated predator attack. By manipulating available food, we separated the effects of hunger and other rank associated factors on accepted predation risk. […]
The breeding biology of the Willow Tit in Northeastern Siberia
Willow Tit (Parus montanus) Science Article 2 abstract The Magadan region of northeastern Siberia. Clutch size and number of fledglings averaged 7.5 and 6.5, respectively, and both were correlated negatively with the date of the first egg. Nestling growth rate was correlated positively with the date of the first egg, but was not related to […]