By Nikita Chernetsov
Most birds can't disguise the gap among their breeding and wintry weather quarters in a single hop. they need to make a number of flights alternated with stopovers. Which components govern the birds’ judgements to forestall, to prevent for a way lengthy, while to renew flight? what's greater – to acquire a lot gasoline and to make lengthy flights for lots of 1000's of kilometres, or to trip in small steps? Is it essential to locate habitats just like the breeding ones or different habitats could do? Are lengthy migratory flights certainly so high priced energetically as frequently assumed? This monograph summarizes our present wisdom at the ecology of songbird migrants in the course of migratory stopovers and on their behaviour.
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Extra info for Passerine Migration: Stopovers and Flight
This is further supported by tracking of radio-tagged pied flycatchers (Chernetsov et al. 2004) and European robins (Chernetsov and Mukhin 2006). e. 53% in autumn. 5%, Fig. 2). However, it is worth noting again that after crossing the Gulf of Mexico 79% of radio-tracked summer tanagers continued nocturnal migration on the first night after their arrival (Moore and Aborn 1996). 5 Concluding Remarks Duration of migratory stopovers of songbirds usually varies between 1 and 15 days. Sometimes, especially before and just after crossing large ecological barriers (large water bodies, deserts) stopovers may be longer and reach 20–25 days, occasionally even longer.
Brit Birds 69:384–399 Blyumental TI, Gavrilov VM, Dolnik VR (1967) O prichinakh volnoobraznosti migratsii zyablika (On the causes of wave-like pattern of the chaffinch migration). Comm Baltic Comm Study Bird Migr 4:69–80 Bolshakov CV, Bulyuk VN, Sinelschikova A (2000) Study of nocturnal departures in small passerine migrants: retrapping of ringed birds in high mist-nets. Vogelwarte 40:250–258 Bolshakov C, Bulyuk V, Chernetsov N (2003a) Spring nocturnal migration of Reed Warblers Acrocephalus scirpaceus: departure, landing and body condition.
The authors suggest that such a broad annual variation was due to varying abundance of plum aphids Hyalopterus pruni that is believed to be the main food of sedge warblers in late summer and autumn (Bibby and Green 1981). 1 days when only estimates after the initial capture are included; Table A3 in Schaub and Jenni 2001a). 7 days refers to the total stopover duration in Ginak in Gambia which may refer to the wintering range rather than autumn passage. It should however be emphasized that not all long stopovers should automatically be dismissed as unrelated to ‘true’ migration.