Magpie (Pica pica) Science Article 11 abstract In many animals immunity is not fully developed until adulthood but the youngstill need protection against various sets of pathogens. Thus, bird nestlings are highlydependent on antibodies received from their mother (in the eggs) during their rapidearly growth period. MARJO PIHLAJA, HELI SIITARI and RAUNO V. ALATALO, Journal […]
Differential maternal investment counteracts for late breeding inmagpies Pica pica: an experimental study
Magpie (Pica pica) Science Article 7 abstract Reproductive success in many avian populations declines throughout the breedingseason. Two hypotheses have gained attention to explain such a decline: the
Maternal effects on offspring Igs and egg size in relationto natural and experimentally improved food supply
Magpie (Pica pica) Science Article 8 abstract Maternal effects have been suggested to function as a mechanism for transgenerational plasticity,in which the environment experienced by the mother is translated into the phenotype of the offspring.In birds and other oviparous vertebrates where early development is within the egg, mothersmay be able to improve the viability prospects […]
JUVENILE GRAY JAY PREYS UPON MAGNOLIA WARBLER
Magnolia Warbler (Dendroica magnolia) Science Article 1 abstract A juvenile Gray Jay (Perisoreus canadensis) was observed to capture, kill, and eata healthy juvenile Magnolia Warbler (Dendroica magnolia), demonstrating that Gray Jaysdepredate free-flying birds in addition to nestlings and dead adults. Predation of birds, which was manifested in a recently independent bird, may be a regular […]
SERIES OF NESTS OF THE MAGNOLIA WARBLER.
Magnolia Warbler (Dendroica magnolia) Science Article 2 abstract The warblers were late in 1907. The cold, backward spring was behind time in unfolding catkin and leaf whereon the insect hosts prey, and the warblers who live on the insect life keep pace with the resurrection and birth of moth and butterfly, mosquito and aphis, caterpillar […]
Month to month changes in age ratio and brood size in Pink-footed Geese Anser brachyrhynchus in autumn
Pink-footed Goose (Anser brachyrhynchus) Science Article 7 abstract The conservation and management of wild goose populations requires an accurate estimate of productivity to be made each year, usually soon after the birds’ arrival in the wintering grounds. The best time to make the estimates is not always clear, however, since the measures used may vary […]
Month to month changes in age ratio and brood size in Pink-footed Geese Anser brachyrhynchus in autumn
Pink-footed Goose (Anser brachyrhynchus) Science Article 7 abstract The conservation and management of wild goose populations requires an accurate estimate of productivity to be made each year, usually soon after the birds’ arrival in the wintering grounds. The best time to make the estimates is not always clear, however, since the measures used may vary […]
Do parasitic mites decrease growth of nestling Pied Flycatchers Ficedula hypoleuca?
Pied Flycatcher (Ficedula hypoleuca) Science Article 10 abstract The effect of a parasitic mite Dermanyssus hirundinis on the growth and survival of nestling Pied Flycatcher Ficedula hypoleuca was tested by an experiment where the parasite level was reduced in half of the nest boxes using an insecticide, Although the abundance of mites was significantly reduced […]
Do parasitic mites decrease growth of nestling Pied Flycatchers Ficedula hypoleuca?
Pied Flycatcher (Ficedula hypoleuca) Science Article 10 abstract The effect of a parasitic mite Dermanyssus hirundinis on the growth and survival of nestling Pied Flycatcher Ficedula hypoleuca was tested by an experiment where the parasite level was reduced in half of the nest boxes using an insecticide, Although the abundance of mites was significantly reduced […]
Niche partitioning of two Palearctic passerinemigrants with Afrotropical residents in theirWest African winter quarters
Pied Flycatcher (Ficedula hypoleuca) Science Article 5 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 […]