Where do crows go in winter? The research, which is published in Ecology Letters, was conducted Eagles migrate through bad weather to arrive in time to nest April 5, Migration is tough, and birds do everything they can to optimize it. How do factors like weather and experience affect the strategies they choose?
Study of bird migration tricky due to hybridization August 23,Estonian Research Council The hybrid of the lesser spotted eagle and the greater spotted eagle Credit: Urmas Sellis Hybridization among bird species is a widespread phenomenon, which is best illustrated in Estonia by the lesser spotted eagle and the greater spotted eagle.
However, due to the fact that the migration strategies of both bird species are completely different, studying their hybrid offspring helps ornithologists discover a lot about their migration secrets.
The lesser spotted eagle is an early leaving far traveler. The greater spotted eagle is a late leaving short- and middle-distance traveler.
At the same time, studying hybrids can reveal answers to ecological questions.
It has previously only been possible to conduct experiments with small passerines in order to check these assumptions. The research of migration of big birds with a longer lifespan has been hampered by inadequate technical capacities.
To follow the migration, hybrid birds were fitted with GPS transmitters tracking their exact location in Estonia, Lithuania and Poland.
The data was gathered for more than a decade, and to obtain a better overview, the researchers compiled a thorough migration database. The hybrid of the lesser spotted eagle and the greater spotted eagle. Instead, the hybrids rather chose to overwinter at the latitudes more typical of greater spotted eagles.
In addition, the variety of their migration routes and the size of winter territories was more characteristic of the greater spotted eagle.
These results show that although social and territorial factors can impact the migration strategies of birds with a longer lifespan, the role of genetic factors in these species is bigger than presumed.The Smithsonian Migratory Bird Center is dedicated to understanding, conserving and championing the grand phenomenon of bird migration.
Founded in , and located at the Smithsonian's National Zoo in Washington, D.C., SMBC scientists seek to clarify why migratory bird populations are declining before the situation becomes desperate.
A flock of Barnacle Geese during autumn migration Example of long distance bird migration routes. Bird migration is the regular seasonal journey undertaken by many species of.
Ornithology is a branch of zoology that concerns the study of pfmlures.coml aspects of ornithology differ from related disciplines, due partly to the high visibility and the aesthetic appeal of birds.
Most marked among these is the extent of studies undertaken by amateurs working within the parameters of strict scientific methodology. migration - the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding periodic event, recurrent event - an event that recurs at intervals.
bird seems pre-programmed to leave its breeding area at a certain time each year, and to return at another time.
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Timing, directions and distances are relatively constant from year to year. This type of migration is found in both. Tracking Radar Studies of Bird Migration TIMOTHY C. WILLIAMS JANET M.
WILTJAMS The State University of New Yurk at BufWo JOHN M. TEAL JOHN W. KANWISHER Woods Hole Qcemographic Institution R ADARS HAVE NOW BEEN USED to study bird migration for more than two dec- ades (ref. 1).The majority of these studies.