Fabião, AntónioRodrigues, D.J.C.Figueiredo, M.E.Tenreiro, P.J.2009-10-212009-10-212000"Die Vogelwarte". 40 (2000) 292-297http://hdl.handle.net/10400.5/1361Results from recoveries, recaptures and resightings indicated a resident character of the portuguese mallard populations. Some winter migration may reach the studied areas but movements from the summer-ringed birds showed mostly dispersion and abmigration, although some were as long as 3580 km long until Russia. Frequent movements between local portuguese mallard populations resulted from dispersion.engmallardanas platyrhynchosmigrationmovementsPortugaljournal article