Abstract
Acoustic differentiation among Goldcrests (Regulus regulus) from the Canary Islands was investigated by sonagraphic analysis with respect to the recently discovered genetic subdivision of the Canarian populations into a clade from Tenerife and La Gomera (nominate ssp. teneriffae) and a second clade from La Palma and El Hierro (recently described as ssp. ellenthalerae). One common dialect, song type A, was found on all four islands inhabited by Goldcrests and is also present on São Miguel, Azores (ssp. azoricus). This one is composed of a rapid trill introduction followed by an ascending part and a terminal flourish. Further Canarian song types are variations of this dialect, differing in trill elements and composition of the second ascending phrase. A remarkably different dialect was exclusively found in the Anaga Mountains on Tenerife. The rhythmic song pattern of alternating high- and lower-pitched elements shows strong resemblance to the song of European nominate regulus and to other island dialects from the Azores. Local variations of song type A were found on El Hierro and La Palma. Three acoustic clusters can be distinguished by discriminant analysis, one comprising all songs of ssp. ellenthalerae from La Palma and El Hierro and two further teneriffae clusters encompassing songs from La Gomera on the one hand and those from Tenerife on the other. The findings are discussed with respect to the potential evolutionary causes of the different song repertoires on the Canaries, the Azores and the European continent and to the use of acoustic markers for taxonomic diagnosis.
References
Alström, P. & Olsson, U. (1999) The Golden-spectacled Warbler: a complex of sibling species, including a previously undescribed species. Ibis, 141, 545–568.
Alström, P. & Ranft, R. (2003) The use of sound in bird systematics and the importance of bird sound archives. Bulletin of the British Ornithological Club (Suppl.), 123A, 114–135.
Becker, P.H. (1977a) Verhalten auf Lautäußerungen der Zwillingsart, interspezifische Territorialität und Habitatansprüche von Winter- und Sommergoldhähnchen (Regulus regulus, R. ignicapillus). Journal für Ornithologie, 118, 233–260.
Becker, P.H. (1977b) Geographische Variation des Gesanges von Winter- und Sommergoldhähnchen (Regulus regulus, R. ignicapillus). Die Vogelwarte, 29, 1–37.
Becker, P.H. (1978) Vergleich von Lautäußerungen der Gattung Regulus (Goldhähnchen) als Beitrag zur Systematik. Bonner Zoologische Beiträge, 29, 101–121.
Becker, P.H., Thielcke, G. & Wüstenberg, H. (1980) Versuche zum angenommenen Kontrastverlust im Gesang der Blaumeise (Parus caeruleus) auf Teneriffa. Journal für Ornithologie, 121, 81–95.
Bergmann, H.H. & Schottler, B. (2001) Tenerife robin Erithacus (rubecula) superbus - a species of its own? Dutch Birding, 23, 140–146.
Catchpole, C.K. & Slater, P.B.J. (1995) Bird song. Biological themes and variation. Oxford University Press, Oxford, 248 pp.
Dickinson, E.C. (2003) The Howard & Moore complete checklist of the birds of the world. 3rd Edition. Christopher Helm, London, 1039 pp.
Dietzen, C., Witt, H.-H. & Wink, M. (2003) The phylogeographic differentiation of the European robin Erithacus rubecula on the Canary Islands revealed by mitochondrial sequence data and morphometrics: evidence for a new robin taxon on Gran Canaria? Avian Science, 3, 115–131.
Doutrelant, C., Leitao, A., Otter, K. & Lambrechts, M.M. (2000) Effect of blue tit song syntax on great tit territorial responsiveness — an experimental test of the character shift hypothesis. Behavioural Ecology and Sociobiology, 48, 119–124.
Eck, S. (1996) Die paläarktischen Vögel — Geospezies und Biospezies. Zoologische Abhandlungen Dresden, 51, 105–118.
Glutz von Blotzheim, U.N. & Bauer, K.M. (1991) Handbuch der Vögel Mitteleuropas, 12II. Aula-Verlag, Wiesbaden, 1460 pp.
Hartert, E. (1910) Die Vögel der paläarktischen Fauna 1. Friedländer & Sohn, Berlin, 832 pp.
Helbig, A.J., Martens, J., Seibold, I., Henning, F., Schottler, B. & Wink, M. (1996) Phylogeny and species limits in the palearctic chiffchaff Phylloscopus collybita complex: mitochondrial genetic differentiation and genetic evidence. Ibis, 138, 650–666.
Irwin, D.E., Bensch, S. & Price, T.D. (2000) Speciation in a ring. Nature, 409, 333–337.
Irwin, D.E., Alström, P., Olsson, U. & Benowitz-Fredericks, Z.M. (2001) Cryptic species in the genus Phylloscopus (Old World leaf warblers). Ibis, 143, 233–247.
Löhrl, H. & Thaler, E. (1980) Das Teneriffa-Goldhähnchen Regulus regulus teneriffae — Zur Biologie, Ethologie und Systematik. Bonner Zoologische Beiträge, 31, 78–96.
Lynch, A. (1996) The population memetics of birdsong. In: Kroodsma, D.E. & Miller, E.H. (Eds.) Ecology and evolution of acoustic communication in birds. Cornell University Press, 181–197.
Martens, J. (1980) Lautäußerungen, verwandtschaftliche Beziehungen und Verbreitungsgeschichte asiatischer Laubsänger (Phylloscopus). Advances in Ethology, 22, 1–71.
Martens, J. (1996) Vocalization and speciation of palearctic birds. In: Kroodsma, D.E. & Miller, E.H. (Eds) Ecology and evolution of acoustic communication in birds. Cornell University Press, pp. 221–240.
Martens, J., Eck, S., Päckert, M., Sun, Y.-H., 1999. The Golden-spectacled Warbler Seicercus burkii - a species swarm. Zoologische Abhandlungen Dresden, 50, 282–327.
Martens, J., Eck, S., Sun, Y.-H., 2002. Certhia tianquanensis Li, a treecreeper with relict distribution in Sichuan, China. Journal of Ornithology, 143, 440-455.
Martens, J. & Kessler, P. (2000) Territorial song and song neighbourhoods in the Scarlet Rosefinch Carpodacus erythrinus. Journal of Avian Biology, 31, 399–411.
Martens, J., Päckert, M., Nazarenko, A.A., Valchuk, O. & Kawaji, N. (1998) Comparative bioacoustics of territorial song in the Goldcrest (Regulus regulus) and its implications for the intrageneric phylogeny of the genus Regulus. Zoologische Abhandlungen Dresden, 50, 99–128.
Martín, A. & Lorenzo, J.A. (2001) Aves del archipélago Canario. Francisco Lemus, La Laguna, Tenerife, 787 pp.
McCracken, K. G. & Sheldon, F. H. (1997) Avian vocalization and phylogenetic signal. Proceedings of the National Academy of Science of the USA, 94, 3833–3836.
Päckert, M., Martens, J. & Hofmeister, T. (2001) Lautäußerungen der Sommergoldhähnchen von den Inseln Madeira und Mallorca (Regulus ignicapillus madeirensis, R. i. balearicus). Journal für Ornithologie, 142, 16–29.
Päckert, M., Martens, J., Nazarenko, A.A., Kosuch. J. & Veith, M. (2003) Phylogenetic signal in song of crests and kinglets (Aves: Regulus). Evolution, 57, 616–629.
Päckert, M., Martens, J., Nazarenko, A. A., Valchuk, O., Petri, B., Eck, S., Veith, M., 2005. The great tit, Parus major, a misclassified ring species. Biological Journal of the Linnean Society 86, 153–174.
Päckert, M. & Martens, J. (2004) Song dialects on the Atlantic islands: Goldcrests of the Azores (Regulus regulus azoricus, R. r. sanctae-mariae, R. r. inermis). Journal of Ornithology, 145, 23–30.
Päckert, M., Martens, J., Sun, Y.-H. & Veith, M. (2004) The radiation of the Seicercus burkii complex and its congeners — molecular genetics and bioacoustics. Organisms, Diversity and Evolution, 4, 341–364.
Päckert, M., Dietzen, C., Martens, J., Wink, M. & Kvist, L. (2006). Radiation of Atlantic Goldcrests (Regulus regulus ssp.): Evidence of a new taxon from the Canary Islands. Journal of Avian Biology, 37, 1–19.
Payne, R.B. & Payne, L.L. (1996) Demography, dispersal, and song dialects and the persistence of partnerships in Indigo Buntings. In: Black, J.M. (Ed.): Partnerships in birds: the study of monogamy. Oxford University Press, pp. 305–320.
Price, J.J. & Lanyon, S.M. (2004) Song and molecular data identify congruent but novel affinities of the Green Oropendola (Psarocolius viridis). The Auk, 121, 224–229.
Salzburger, W., Martens, J. & Sturmbauer, C. (2002) Paraphyly of the Blue Tit (Parus caeruleus) suggested from cytochrome b sequences. Molecular Phylogenetics and Evolution, 24, 19–25.
Schottler, B. (1995) Songs of blue tits Parus caeruleus palmensis from La Palma (Canary Islands): a test of hypothesis. Bioacoustics, 6, 135-152.
Seebohm, H. (1883) History of British birds, 1. R.H. Porter, London, 614 pp.
Slater, P.J.B. & Sellar P.J. (1986) Contrasts in the songs of two sympatric chaffinch species. Behaviour, 99, 46–64.
Storck, M. & Bergmann, H.-H. (1988) Der Gesang des Rotkehlchens (Erithacus rubecula superbus) von Teneriffa (Kanarische Inseln) — Struktur und Erkennen eines Inseldialekts. Zoologisches Jahrbuch Physiologie, 92, 197–212.
Sturmbauer, C., Berger, B., Dallinger, R. & Föger, M. (1997) Mitochondrial phylogeny of the genus Regulus and implications on the evolution of breeding behaviour in sylvioid songbirds. Molecular Phylogenetics and Evolution, 10, 144–149.
Thaler, E. (1981) Nachruf auf zwei Goldhähnchen. Die gefiederte Welt, 10, 187–189.
Thaler, E. (1990) Die Goldhähnchen. Die Neue Brehm-Bücherei, Wittenberg, Lutherstadt, 166 pp.
Thielcke, G. (1970) Lernen von Gesang als möglicher Schrittmacher von Evolution. Zeitschrift für zoologische Systematik und Evolutionsforschung, 8, 309–320.
Thielcke, G. (1972) On the origin of divergence of learned signals (songs) in isolated populations. Ibis, 115, 511–516.
Thielcke, G. (1984) Lebenslange Stabilität des Gesanges handaufgezogener Gartenbaumläufer (Certhia brachydactyla). Journal für Ornithologie, 125, 447–454.
Tubaro, P.L. (1999) Bioacústica aplicada a la sistematica, conservación y manejo depoblaciones naturales de aves. Etología, 7, 19–31.
Vaurie, C. (1954) Systematic notes on Palearctic birds. N° 8. Sylviinae: the genus Regulus. American Museum Novitates, 1684, 9.
Volsøe, H. (1951) The breeding birds of the Canary Islands. I. Introduction and synopsis of the species. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening i Kobenhavn, 113, 1–153.
Voous, K.H. (1962) Die Vogelwelt Europas und ihre Verbreitung. Parey, Hamburg, Berlin, 284 pp.