Thursday, January 17, 2013

New papers out now!

In these first weeks 2013  two new papers have been published relying on raptor migration and wintering. 
The first one is published on Bird Study and shows, through a ringing recoveries analysis, the leap-frog migration patterns of Western Marsh Harriers. Individuals "breeding in Northern and Eastern Europe migrate farther than individuals belonging to the populations within Western and Southern Europe, with no effect of age classes in relation to the latitude of wintering." Moreover "Males show a tendency to migrate longer distances than females" and "when taking into account only birds wintering south of the Sahara desert, juveniles winter further west than adults". The latter result "could be related to the different ability of experienced individuals to compensate for the wind drift of dominant easterly winds during migration over the desert in autumn.".
The other paper compares the autumn migration of Western Marsh Harriers and juvenile European Honey Buzzards through Greece. The paper is published on Journal of Biological Research-Thessaloniki. The results of this study show two different migration strategies, the Western Marsh Harriers "migrate through parallel flyways, while juvenile European Honey Buzzards migrate island hopping being attracted by landmarks and following leading lines of land masses.". The reason of this different migratory behaviour could be related to morphological differences in the two species. "A simulation process demonstrated marked differences in the energy consumption rates between the two species, highlighting that the powered flapping flight is particularly more disadvantageous for the European Honey Buzzard rather than for the Western Marsh Harrier".

Here following the links to read the papers:
Moreover are available the abstracts of two presentations made at two recent congresses  held in Italy last autumn:

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