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Population status and structure of mountain nyala in the Bale Mountains National Park, Ethiopia
Befekadu Refera and Afework Bekele
 Biology Department, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
Correspondence: Afework Bekele, Biology Department, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia. E-mail: Zagt@telecom.net.et
Copyright © 2004 African Journal of Ecology
KEYWORDS
Bale Mountains • mountain nyala • population structure

Abstract

AbstractIntroductionThe study areaMethodsResultsReferences

The study on the population status and structure of mountain nyala (Tragelaphus buxtoni) was carried out in the Bale Mountains National Park, Ethiopia during the wet and dry seasons of 2000/2001. Total counts were carried out in an area of 13.1 km2. The count ranged between 682 and 732 individuals. Females comprised 62.9% while males 27.4%. The calf ratio was 9.7%. The group structure of the animals varied with season. Large herds were frequently observed during the wet season and smaller groups during the dry season. Group size changed seasonally. In both seasons, 7–12 individuals were the frequent group size formation. The maximum group (62) was observed during the wet season. The population trend of the animal from 1975 to 1990 indicated a recovery and increase. But between 1990 and 1995 the population showed a continuous and steep decline. However, between 1995 and 2000 the population trend showed a better condition when compared with the previous years.

Résumé

AbstractIntroductionThe study areaMethodsResultsReferences

On a réalisé une étude sur le statut et la structure de la population de Nyala de montagne (Tragelaphus buxtoni) dans le Parc National des Bale Mountains, en Éthiopie, pendant les saisons pluvieuses et sèches de 2000/2001. On a fait des comptages totaux sur une surface de 13.1 km2. Leur nombre se situe entre 682 et 732 individus. Les femelles représentaient 62.9% du total, les mâles 27.4%, et les jeunes 9.7%. La structure des groupes variait avec les saisons. Les grands groupes s'observaient fréquemment pendant la saison des pluies, et les plus petits en saison sèche. La taille du groupe aussi variait avec les saisons. Tant en saison sèche qu'en saison des pluies, la taille la plus fréquente du groupe allait de 7 à 12 individus. Le plus grand groupe (62) a été observé en saison des pluies. Entre 1975 et 1990, la population a présenté une tendance à la restauration et des chiffres à la hausse. Mais entre 1990 et 1995, le déclin fut continu et rapide. Cependant, entre 1995 et 2000, la condition de la population s'améliore par rapport aux années précédentes.


(Manuscript accepted 2 October 2002)

DIGITAL OBJECT IDENTIFIER (DOI)
10.1111/j.0141-6707.2004.00437.x About DOI

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