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ORIENTATIONAL RESPONSES TO DIFFERENT LIGHT STIMULI BY ADULT AND YOUNG SEDGE WARBLER (ACROCEPHALUS SCHOENOBAENUS) DURING AUTUMN MIGRATION: A FUNNEL TECHNIQUE STUDY by NATALE E. BALDACCINI and ELENA MARIA BEZZI1) (Istituto di Zoologia, Università di Parma, Via Università 12-43100 Parma, Italy) (With 2 Figures) (Acc. 26-III-1989) 1. Introduction ' Migratory birds, when choosing and maintaining a route, do not make use of only one orientational cue, but instead rely upon various reference systems organised in a hierarchical order (ABLE, 1980; WILTSCHKO et al., 1980; WILTSCHKO & WILTSCHKO, 1985). However, it seems improbable that the young migrant initially has the entire set of orientational cues at its disposition (EMLEN, 1969; WILTSCHKO 8L al., 1980; WILTSCHKO & WILTSCHKO, 1975). Such a complex integration of several reference systems certainly necessitates a process of biological maturation, or learn- ing, during the first migratory cycle, as has been demonstrated by PERDECK'S pioneer work (1958) on starlings. Moreover, in long-distance migrants the hierarchy of orientational cues should be particularly plastic, thereby enabling ecological adaptation to the distance and speed of migration (WILTSCHKO & WILTSCHKO, 1975). Hence we can expect dif- ferences in orientational behaviour between adults and yearlings at their first migration, in response to
Behaviour – Brill
Published: Jan 1, 1989
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