Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-26T19:35:33.143Z Has data issue: false hasContentIssue false
  • English
  • Français

Conserving the endemic birds on the Comoro Islands, II: population fluctuations on Ngazidja

Published online by Cambridge University Press:  11 May 2010

Jan Stevens ,
Marc Herremans  and
Michel Louette
Jan Stevens
Affiliation:
Provinciaal Natuurcentrum, Zuivelmarkt 33, B-3500 Hasselt, Belgium
Marc Herremans
Affiliation:
Department of Wildlife and National Parks (Ornithology Section), P.O. Box 131, Gaborone, Botswana
Michel Louette
Affiliation:
Koninklijk Museum voor Midden-Afrika, B-3080 Tervuren, Belgium
Rights & Permissions [Opens in a new window]

Summary

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Land bird abundances on Ngazidja, Comoro Islands, obtained by point counts in September 1985 and November–December 1989 are compared. The overall abundance of most species did not differ significantly. Most differences can be interpreted as normal within-year fluctuations. Some important changes are identified and attributed to shortterm vegetation changes: increase of Columba polleni, Coracopsis vasa, Zoonavena grandidieri, Coracina cinerea in Nioumbadjou after abandonment of forest exploitation; decrease of Coracina cinerea at M'Lima Mani North after replacement of the natural shrub layer by bananas. Genuine long-term population changes occur in Coracopsis nigra (increase) and Corvus albus (decrease).

Il s'agit d'une comparaison entre les abondances d'oiseaux terrestres, relevées sur Ngazidja, îles Comores, au cours de comptages par points effectués en septembre 1985 et novembre-décembre 1989. L'abondance générate de la plupart des espèces ne diffère pas de façon significative. La plupart des différences peuvent être interprétées comme des fluctuations annuelles normales. Des changements importants sont identifiés et attribués à des changements de végétation à court terme: augmentation de Columba polleni, Coracopsis vasa, Zoonavena grandidieri, Coracina cinerea dans Nioumbadjou après l'abandon de l'exploitation de la forêt; diminution de Coracina cinerea au Mont Lima Mani Nord après le remplacement de la couche d'arbustes naturelle par des bananiers. De véritables changements de population à long terme sont observés chez Coracopsis nigra (augmentation) et chez Corvus albus (diminution).

Type
Research Article
Information
Bird Conservation International , Volume 2 , Issue 1 , March 1992 , pp. 81 - 91
Copyright
Copyright © Birdlife International 1992

References

Benson, C. W. (1960) The birds of the Comoro Islands: results of the British Ornithologists' Union Centenary Expedition 1958. Ibis 103b: 5–106.CrossRefGoogle Scholar
Boag, P. T. (1986) The genetics of island birds. Ada XIX Congr. Internatn. Orn. 1986: 1550–1563.Google Scholar
Brosset, A. (1989) Population dynamics of birds in a northeastern Gabon forest. Ostrich (suppl.) 14: 1–6.CrossRefGoogle Scholar
Diamond, J. M. (1985) Population processes in island birds: immigration, extinction and fluctuations. Pp. 17–21 in Moors, P. J., ed. Conservation of island birds. Cambridge, U.K.: International Council for Bird Preservation (Techn. Publ. 3).Google Scholar
Diamond, A. W., ed. (1987) Studies of Mascarene Island birds. Cambridge, U.K.: Cambridge University Press.CrossRefGoogle Scholar
Fogden, M. P. L. (1972) The seasonality and population dynamics of equatorial forest birds in Sarawak. Ibis 114: 307–343.CrossRefGoogle Scholar
Frith, C. B. (1976) A twelve-month field study of the Aldabran Fody Foudia eminentissima aldabrana. Ibis 118: 155–178.CrossRefGoogle Scholar
Herremans, M. (1988) Inter-island variation in bird vocalizations on the Comoros. Proc. 6th Pan-Afr. Orn. Congr.: 281–295.Google Scholar
Herremans, M., Louette, M. and Stevens, J. (1991) Conservation status and vocal and morphological description of the Grand Comoro Scops Owl Otus pauliani Benson i960. Bird Consent. Internatn. 1: 123–133.CrossRefGoogle Scholar
Hustings, M. F. H., Kwak, R. G. M., Opdam, P. G. M. and Reynen, M. J. S. M. (1985) Vogelinventarisatie, achtergronden, richtlijnen en verslaggeving. Wageningen: PUDOC.Google Scholar
Komdeur, J., Bullock, I. D. and Rands, M. R. W. (1991) Conserving the Seychelles Warbler Acrocephalus sechellensis by translation: a transfer from Cousin Island to Aride Island. Bird Conserv. Internatn. 1: 177–185.CrossRefGoogle Scholar
Louette, M. (1988) Les oiseaux des Comores. Ann. Mus. R. Afr. Cent., Zool. 255: 1–192.Google Scholar
Louette, M. and Herremans, M. (1982) The Blue Vanga Cyanolanius madagascarinus on Grand Comoro. Bull. Brit. Orn. Club 102: 132–135.Google Scholar
Louette, M. and Herremans, M. (1985) Taxonomy and evolution in the Bulbuls (Hypsipetes) on the Comoro Islands. Proc. Internatn. Symp. African Vertebr., Bonn 1985: 407–423.Google Scholar
Louette, M., Stevens, J., Bijnens, L. and Janssens, L. (1988) A survey of the endemic avifauna of the Comoro Islands. Cambridge, U.K.: International Council for Bird Preservation (Study Report 25).Google Scholar
MacArthur, R. H. and Wilson, E. O. (1967) The theory of island biogeography. Princeton: Princeton University Press.Google Scholar
Milon, P., Petter, J. J. and Randrianasolo, G. (1973) Faune de Madagascar: XXXV Oiseaux. Paris: CNRS.Google Scholar
Prŷs-Jones, R. P. and Diamond, A. W. (1984) Ecology of the land birds on the granitic and coraline islands of the Seychelles, with particular reference to Cousin Island and Aldabra Atoll. Pp. 529–558 in Stoddart, D. R., ed. Biogeography and ecology of the Seychelles Islands. The Hague: Dr W. Junk.Google Scholar
Sokal, R. R. and Rohlf, F. J. (1969) Biometry: the principles and practice of statistics in biological research. San Francisco: W. H. Freeman.Google Scholar