منابع مشابه
The Evolution of Differential Bird Migration
of Baker's View of Avian Migration Baker (197S) defines migration to include any non-accidental movement by a metazoan from one spatial unit to another' He assumes It at migrations have evolved because they are, or historically have been' "J"piitat the level of individual selection' (As he puts it, chickens cross the road because they find conditions sufficiently better on the other side to hav...
متن کاملWeather and bird migration Norman Elkins
© British Birds 98 • May 2005 • 238-256 ABSTRACT Bird migration in and through Britain and Ireland shows great variation, both seasonally and annually. Much depends on atmospheric conditions, which can equally hinder and assist migration, both on a broad scale (the distribution, extent, intensity and movement of pressure patterns), and at a local level (temporal and spatial changes in wind, vis...
متن کاملIndividuality in bird migration: routes and timing.
The exploration of animal migration has entered a new era with individual-based tracking during multiple years. Here, we investigated repeated migratory journeys of a long-distance migrating bird, the marsh harrier Circus aeruginosus, in order to analyse the variation within and between individuals with respect to routes and timing. We found that there was a stronger individual repeatability in...
متن کاملNeotropical Bird Migration during the Ice Ages: Orientation and Ecology
--Reconstruction f breeding habitat of North American Neotropical migrants 18,000 years ago and 9,000 years ago indicated major shifts in both location and composition of plant communities relative to present conditions. Increased vegetation in xeric areas may have compensated, at least in part, for the reduction in breeding habitat due to glaciation. Autumnal flights of Neotropical passerine m...
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ژورنال
عنوان ژورنال: Nature
سال: 1934
ISSN: 0028-0836,1476-4687
DOI: 10.1038/134574b0