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| HAL : hal-00623335, version 1 |
| DOI : 10.1016/j.jaridenv.2011.04.021 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Arid Environments 75 (2011) 1232-1236 |
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| The recent expansion of an avian invasive species (the Cattle Egret Ardea ibis) in Algeria |
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| A. Si Bachir 1F. Ferrah 1 |
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| (2011) |
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| This study identifies new information on the recent distribution of an invasive bird species, the Cattle Egret Ardea ibis, in Algeria. Breeding and wintering distributions as well as breeding numbers were obtained from large-scale surveys in 1999 and 2007, and from historical data. Between 1999 and 2007, the total number of colonies found increased from 51 to 87, and most were located in the northern part of the country. The breeding distribution area, confined to the coastal areas in the 1970s, has shifted further south, and reached the northern part of the Sahara since the 2000s. Most colonies were established during the period 1980e1995. The oldest colonies were generally larger than the recent ones. The number of colonies increased by 83% between 1999 and 2007 in the 12 administrative units (wilayas) surveyed. The number of breeding pairs increased from 7765 in 1999 to 28544 in 2007, corresponding to an annual population growth rate of 17.7%. The changes in distribution and population dynamics since the 1970s and the potential factors affecting these changes are discussed. |
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| 1 : | Département de Biologie |
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Université de Batna |
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| 2 : | Centre d'études biologiques de Chizé (CEBC) |
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CNRS : UPR1934 |
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| 3 : | Laboratoire Ecologie Fonctionnelle et Environnement (EcoLab) |
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PRES Université de Toulouse – Institut National Polytechnique de Toulouse - INPT – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées – CNRS : UMR5245 |
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| Domaine | : | Sciences de l'environnement |
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| Birds - Distribution - Invasion - North-Africa - Range extension |
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| hal-00623335, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00623335 | |
| oai:hal.archives-ouvertes.fr:hal-00623335 | |
| Contributeur : Martine Lacalle | |
| Soumis le : Mercredi 14 Septembre 2011, 09:32:36 | |
| Dernière modification le : Lundi 28 Novembre 2011, 10:00:29 | |
