THE CONSERVATION BENEFITS OF ESTIMATING TURNOVER IN BIRDS

CONVENORS
Dr Mark Rehfisch
British Trust for Ornithology, The Nunnery, Thetford, IP24 2PU, UK
T: +44 (0) 1842 750050 F: +44 (0) 1842 750050 E: Mark.Rehfisch@bto.org

Dr Roger Pradel

Centre d'Ecologie Fonctionnelle et Evolutive, UMR 5175, 1919 route de Mende, F-34293 Montpellier Cedex 5, France
T: +33 467 613 265 F: +33 467 412 138 E: Roger.Pradel@cefe.cnrs.fr

DESCRIPTION
One of the major issues in avian conservation has been understanding how birds use sites during the non-breeding period and stop-over sites during the spring and autumn passage, and how we can measure parameters such as the arrival and departure times, the length of stay, survival as well as the total number of birds using such sites. Recent advances in mark-recapture methods have allowed some of these issues to be addressed. During this symposium methods for estimating turnover, survival and site usage will be described as will approaches to gathering the field data that they require. Turnover and survival estimates calculated from existing data sets will be presented. The ecological and conservation implications of turnover, survival and the ecological importance of stop-over sites will be discussed. A proposed European project to calculate turnover will be introduced.

KEYNOTE 1: Atkinson, P.W.
The future of survival and turnover?

KEYNOTE 2: Pradel, R., Atkinson, P., Choquet, R., Drewitt, A., Frederiksen, M. & Rehfisch, M.
Methodological overview

Jacquie Clark

What existing turnover studies tell us

Bauer, S., Ens, B. & Klaassen, M.        

Many routes leading to Rome : potential causes for the multi-route migration system of Red Knots Calidris canutus islandica

Vögeli, M., Laiolo, P., Serrano, D. & Tella, J.

Who are we sampling? Apparent survival differs between methods in a

secretive species