Recuperaciones por condición para Andarríos bastardo

Most recoveries are at the end of breeding season and during autumn migration (~87% in Jul-Sep), when juveniles have primarily been ringed. The majority of encounters are in C and N Europe (~73% combined). the percentage of recoveries of dead birds decreased from 82% pre-1961 to 6% after 1991 with live birds increasing from 13% before 1961 to 84% after 1991 (mostly recaptures by ringers). Shooting was an important factor until about 20 years ago (74% of all pre-1961 and 46% of all 1961-90 recoveries), more recently shooting accounts for just 2.4% of all recoveries. Most of the distant (>=50 km) recoveries are less than 2,500 km away, but a few move >8,000 km.

Movimientos anuales para Andarríos bastardo

Post-breeding dispersal and autumn migration start as early as late Jun, adults being ahead of juveniles which follow about a month later. Migration takes place overland on a broad front (Van Gils et al. 2020). The mean direction for autumn migration in S Sweden was SSW for juveniles and SW for adults (Iwajomo et al. 2013). Autumn migration is most intensive Aug to mid-Sep, although the African wintering grounds are reached as early as late Jul. Spring migration takes place mostly Mar to mid-May, although some late migrants are encountered in the Mediterranean until late May. In Europe, spring migration is quick, with one peak and with males generally preceding females (Remisiewicz et al. 2006, 2007). Few birds remain in Africa in the breeding season.

Breeding sites are reached mostly in May, locally (far N) - even in early Jun.

Few birds remain summering in S Africa (Oschadleus 2002).

Conectividad por mes por región para Andarríos bastardo

Dispersal movements and migration start in mid-summer, with adults leaving first. In Europe, peak passage is in late summer and early autumn. The birds are in their African wintering sites between late summer and mid-spring (rarely late spring). The wintering grounds in W Africa are mainly the Inner Niger Delta, the Gulf of Guinea and the Senegal Delta (Zwarts et al. 2009). In tropical Africa, return migration is mostly in early to mid-spring; late spring in the Mediterranean region and Europe. Data from Germany suggest a progressively earlier arrival in spring and delayed departure in autumn, presumably in response to climate change (Anthes 2004). The overall picture suggests that more easterly routes are taken in spring than in autumn.