Tag: Willow Warbler

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, […]

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 […]

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 […]

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 […]