Ok - Dutch Birding

More documents

Recommendations

Info

4 a r S ec 1/ocalizations of Common, Lesser and Arctic Aedpolls L H z A s 4 2 Jf~r++ 1 ~dil 0 n i Sec 1 e i c S + ~ ~ ~ r,+ ~ ~ E 6 +~ I Y ry ja, r A r .., S e c FIGURE 3 Perching calls of Ihree Common Redpolls Carduelrs flarnmea flammea (C-E) and Iwo Arctic Redpofls C hornemanni exilipes {A-8 } 12
1/ocalirations of Common, Lesser and Arctic Redpolls broken up into several smaller syllables, of which the last was emphasized and clearly descending (figure 3A-B) . This was different from Common which showed one main note, with a generally ascending trend throughout the call (figure 3C-E). Although some variation was obvious, the essential features were present in all full calls analysed . To human ears, the call sounded in Common like a pure whistle rapidly increasing in pitch, pweet . In Arctic, it sounded somewhat hesitating and hoarse, pwljeeu, the descending final syllable being obvious. HolboeRii-type redpolls gave calls structured like those of Common . The perching call of Lesser Redpoll was essentially similar to that of Common Redpoll but the main note was generally more S-shaped which could also be distinguished by human ears (figure 2B-C) . Vocal isolation between Common and Arctic seems well developed . A decoy Arctic showed hardly any vocal reaction when a flock of Commons was flying over. It only once called vigorously, just before it was joined by another Arctic which called very simifarly_ These observations give support to the statemen t A 4 IM ~M~ +M A • ~ ~ ~ ~' I~ z 0 . . s . ~ Z e 0 1 S .c FiGUpr a Breeáing-call adoption 6y femaie Common Redpol! Carduelis ffammea flammea (B , same individual as in figure iD) and fernale Arctic Redpolls C hornemanni exilipes (C, same individual as in figure 1A,C) when paired wíth same male Common (A) 1 3
Page 1 and 2: O~ ~ .` . ~ >Ok ~=• t~ A 6 t ZE ,
Page 3 and 4: ! DUTCH DANUBIA B1RD[NG in samenwer
Page 5 and 6: (Qr~et,fal- 8ird Club The Clubs reg
Page 7 and 8: Kleine Geelpootruiter bij Oosterlan
Page 9 and 10: Kleine Geelpootruiter bij Oosterlan
Page 11 and 12: Reuzenzwartkopmeeuw in IJsselmeerge
Page 13 and 14: Reuzenzwartkopmeeuw in IJsselmeerge
Page 15 and 16: Vocalizations of Common, Lesser and
Page 17: Vocalizations of Common, Lesser and
Page 21 and 22: Vocalizations of Common, Lesser and
Page 23 and 24: notes on asian-pacific bird s Durin
Page 25 and 26: mystery photographs 6-7 Littie Whim
Page 27 and 28: mededelinge n Soortnamen in Dutch B
Page 29 and 30: mededelingen Vorkstaartplevier bij
Page 31 and 32: mededelinge n der bruingele rand of
Page 33 and 34: mededelingen graelfsii . Judging fr
Page 35 and 36: mededelingen dra Lark Melanocorypha
Page 37 and 38: mededelingen Bird records in Morocc
Page 39 and 40: mededelinge n 15-16 Booted Eagles H
Page 41 and 42: ieve n Het is -gelukkig- pas de eer
Page 43 and 44: ecent wp reports 20 Arnerican Pipit
Page 45 and 46: ecent wp reports .~. 23 Isabellíne
Page 47 and 48: ecente meldingen ^&btw y .~1 F *
Page 49 and 50: ecente meldinge n 27 Kleinste Jager
Page 51 and 52: ecente meldingen 31-32 Vorkstaa rtm
Page 53 and 54: ecente meldingen 35 Pestvogel 8omby
Page 55 and 56: ecente meldingen loop vanuit august
Page 57 and 58: ecente meldingen oktober, op Texel
Page 59 and 60: ■ ■ ■ ■ ■ ■ ■ ■ ■
Page 61 and 62: NATUUR & B 9 VELDGIDSEN-VOORRAAD VO
Page 63 and 64: dutch birdin g editorial addres s D

Ok - Dutch Birding

Create successful ePaper yourself

Delete template?

Save as template?