Resumen de A funnel trap for the capture of tits

Juan Carlos Senar, Jordi Domènech, Luis María, Eulalia Moreno Mañas

• Baited funnel traps can capture high numbers of birds and generally do not suffer from trap-response biases (e. G. Trap-shyness or trap-wiseness). Here we describe a modified funnel trap and test its efficiency. The trap mainly captured tit species, but it also trapped other species such as Nuthatches Sitta europaea, Robins Erithacus rubecula, House Sparrows Passer domesticus and Jays Garrulus glandarius. The trap captured more than twice as many Great Tits Parus major as did baited mist nets. Moreover, it could be used under any meteorological conditions, was very easily set, and produced recapture rates close to 7 00%. Jhere was significant monthly variation in the mean number of Great Tits captured per half-day and trap, with the highest daily capture rate in July-August and the lowest in Novernber-December. Jhe high capture rate of birds in July-August was due to the presence of juvenile Great Tits (Euring age 34. The potential biases in the sarnpling of tit populations by means of funnel traps are reviewed with reference to the relevant literature.