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et al.We determined the degree of connectivity in the Eurasian Reed Warbler Acrocephalus scirpaceus between breeding regions in central and northern Europe and stopover sites in Iberia, during the autumn migration. We used both recovery data and wing length analyses to achieve this. Biometric data were obtained during 2009 at 11 sampling localities in Iberia, which we amalgamated into four major migratory areas within the region (Central, Western, Eastern and Southwestern Iberia, hereafter CI, WI, EI, SW). From the EURING database, we selected birds captured at their breeding sites in Europe and recaptured in Iberia during the autumn migration. Reed Warblers passing through WI had shorter wings than those in CI, EI and SW, suggesting that birds in WI migrated shorter distances, a fact also supported by recovery data. Although Reed Warblers showed some population overlap when passing through Iberia, we found that birds passing through EI and CI came from areas further to the east (continental Europe) than those passing through WI (mainly British Isles), thus supporting parallel migration. Reed Warblers tended to converge in southwestern Iberia, suggesting an effect of nearby geographical barriers.This research was funded by the Spanish Ministry of Education (pre-doctoral fellowship to MA), Basque Government (Txingudi Ringing Station), Gipuzkoa Administration (Txingudi Ringing Station), Caja de Ahorros del Mediterraneo (Pego-Oliva Park),\udUniversidad Autónoma de Madrid, Consejería de Medio\udAmbiente of Autonomous Andalusian Government (Doñana\udBiological Station) Portuguese Foundation for Science and\udTechnology (grant SFRH/BPD/40667/2007 awarded to JMN),\udSpanish Ministry of Science and Innovation (project CGL2010-\ud21933-C02-02; EB and JSM) and also by the LIFE Nature project “Restoration and management of wetlands: SPA Canal de Castilla”.Peer Reviewe

Connectivity in Reed WarblersAcrocephalus scirpaceusBetween Breeding Grounds in Europe and Autumn Stopover Sites in Iberia