BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:There and back again\; the migration of the garden warbler - Ulf O
 ttosson - A.P. Leventis Ornithological Research Institute\, Jos\, Nigeria
DTSTART:20120306T160000Z
DTEND:20120306T170000Z
UID:TALK34909@talks.cam.ac.uk
CONTACT:Oskar Brattstrom
DESCRIPTION:The migratory strategy of the Garden Warbler Sylvia borin\, a 
 long-distance passerine migrant\, has been the subject of many studies. Ga
 rden Warblers stop-over to refuel at suitable sites both in Europe and in 
 sub-Saharan Africa as they migrate to their wintering grounds. This strate
 gy therefore provides an excellent opportunity of understanding the moveme
 nt and energetics of migratory birds in general. In this presentation we w
 ill present data from several sites along the migratory journey: Southeast
 ern Sweden (Ottenby Bird Observatory 1950-2008)\, Northern Nigeria (Malamf
 atori near Lake Chad 1999-2000)\, Central Nigeria (Amurum near Jos 2001-20
 06) and Southeastern Nigeria (Becheve Nature Reserve\, Obudu Plateau Oct-D
 ec 2005 and Dec 2007-Jan 2008). Garden Warblers start to migrate towards S
 W over Europe in July-August and start to arrive in Northern Nigeria from 
 the end of August. After spending a short time in the Sahel zone\, they mo
 ve down to Central Nigeria in the Guinea savanna where conditions deterior
 ate in the north. At the Amurum site\, they start to increase their body m
 ass again in October-November and then\, after being quite numerous\, they
  disappear\, probably migrating towards Southeast Nigeria and their final 
 winter quarters. Garden Warblers begin to turn up in Southeastern Nigeria 
 from mid-October and numbers gradually increase. The average fuel loads at
  the different sites vary markedly and probably reflect the migratory stra
 tegy and the distance of the next migratory leap. At Obudu the average fue
 l load was relatively lower as compared to the autumn mean at Amurum\, sug
 gesting that they may not embark on a longer journey further south. The hi
 ghest fuel loads was found in spring at Amurum when birds are heading stra
 ight north over the migratory barrier imposed by the Sahara and most likel
 y also the Mediterranean Sea. Very few Garden Warblers were trapped at Mal
 amfatori in spring indicating that the Guinea savanna region serves as the
  departure point for the final trans-Saharan migration.  
LOCATION:Part II Lecture Theatre\, Department of Zoology
END:VEVENT
END:VCALENDAR