Introduction 08/11/06
Total Page:16
File Type:pdf, Size:1020Kb
ADDIS ABABA UNIVERSITY SCHOOL OF GRADUATE STUDIES DEPARTMENT OF ZOOLOGICAL SCIENCES POPULATION ECOLOGY AND THREATS OF THE ROCK HYRAX (PROCAVIA CAPENSIS) IN BALE MOUNTAINS NATIONAL PARK, ETHIOPIA GEBREMESKEL TEKLEHAIMANOT REDA A THESIS SUBMITTED TO THE DEPARTMENT OF ZOOLOGICAL SCIENCES PRESENTED IN FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN ZOOLOGY (ECOLOGICAL AND SYSTEMATIC ZOOLOGY STREAM) ADDIS ABABA UNIVERSITY ADDIS ABABA, ETHIOPIA MAY 2015 ADDIS ABABA UNIVERSITY SCHOOL OF GRADUATE STUDIES Population Ecology and Threats of the Rock Hyrax (Procavia capensis) in Bale Mountains National Park, Ethiopia By Gebremeskel Teklehaimanot Reda A Thesis Presented to the School of Graduate Studies of the Addis Ababa University in Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Zoology (Ecological and Systematic Zoology Stream) Approved by Examining Board: Prof. Rhodes H. Makundi (Examiner) _______________________ Dr. Tilaye Wube (Examiner) _______________________ Prof. Balakrishnan M. (Advisor) _______________________ Prof. Afework Bekele (Chairman) _______________________ ABSTRACT Population Ecology and Threats of the Rock hyrax (Procavia capensis) in Bale Mountains National Park, Ethiopia Gebremeskel Teklehaimanot Reda Addis Ababa University, 2015 A study on the distribution, population status, feeding ecology, habitat utilization and threats to the rock hyrax (Procavia capensis Pallas 1766) was carried out in the Bale Mountains National Park (BMNP), Ethiopia during August 2010 – February 2013. Distribution of the rock hyrax was assessed by questionnaire survey and field observations. Population status of the species was studied by stratified random sampling using point count method. Direct observations by scan sampling and rumen content analysis were used to study the feeding ecology of the rock hyrax. Data for habitat utilization of the species were collected using quadrat sampling of fresh faecal boli, animal sighting and time spent by the rock hyraxes in different habitats. Threats and population trend of the rock hyrax were studied by questionnaire surveys, interviews and field observations. Data were analyzed using one-way ANOVA, t-test and chi-square test. A total of 30,003 individual rock hyraxes were recorded with a mean population density of 664.5 and 529.9 individuals/km2 during the wet and dry seasons, respectively in the nine sample counting sites. Adults comprised 70.5%, sub-adults comprised 8.3% and juveniles comprised 21.2% of the population. Male to female ratio was 1:1.4. Over 52% of the population constituted adult females and juveniles, showing reproductive potentiality and sustainability of the species. The mean colony range and mean colony size were 5–81.5 and 43, respectively. Rock hyraxes utilized more than 44 plant species as food. The species depends mainly on grasses, and increased browsing during the dry season. Habitat loss and fragmentation, wildfire and hunting by domestic dogs were the primary factors affecting the population status of the rock hyrax in BMNP. Awareness raising among the local people on conservation, benefit sharing of resources from the Park and conservation measures involving the local community are to be considered as priority measures in order to ensure sustainability of BMNP and the inhabiting rock hyraxes in the Park. Key words: Afro-alpine habitat, conservation, distribution, habitat utilization, hyrax, population estimate, questionnaire surveys. iii ACKNOWLEDGEMENTS First and foremost, I am extremely grateful to my advisor, Professor M. Balakrishnan for his advice, unreserved support and encouragements during this research programme from the proposal development to the final dissertation write up. His critical comments, punctual and valuable suggestions are greatly acknowledged. He is also thanked for providing me different articles relevant to the research work. I would also like to express my special appreciation and gratitude to my instructor and stream advisor, Professor Afework Bekele for his professional ethics, consistent follow up, fatherly approach and invaluable advice. My instructor, Dr. Abebe Getahun is also acknowledged for his genuine approach, advice and facilitating duties as Chairperson of the Department of Zoological Sciences during my research work. My sincere gratitude also goes to Dr. Gurja Belay, former Chairman of the Department of Biology, for his moral support and advice throughout the course of my research programme. I would like to thank the Department of Zoological Sciences and the School of Graduate Studies, Addis Ababa University for financial support to carry out my research work. I am grateful to the Ethiopian Wildlife Conservation Authority (EWCA) and Bale Mountains National Park (BMNP) administration for allowing me to undertake this research work in the Park and to live-trap rock hyraxes and collect rumen contents for this study. Frankfurt Zoological Society (FZS) is thanked for logistic support. I am also indebted to the Ethiopian Meteorological Agency (EMA) for providing me meteorological data of the study area. The Ethiopian Wildlife and Natural History iv Society (EWNHS) and EWCA are also acknowledged for allowing me to freely access relevant literatures from their respective libraries. My parent institution, Mekelle University is thanked for sponsoring me to pursue my PhD study as well as financial and material assistance. I am also indebted to the BMNP Warden, Scouts, Ecologists and Field Assistants for their overall support during the study period. The local people in Karari, Gojera and Hora Soba villages in BMNP are also thanked for sharing their valuable time, knowledge and experiences during the questionnaire survey and interviews, which was instrumental for the successful completion of my research work. My sincere gratitude also goes to Ato Melaku Wondafrash, National Herbarium, Addis Ababa University and Dr. Getinet Masresha for their help in identification of plant species of the study area in the herbarium. W/ro Mulu Berhe is thanked for her assistance in the laboratory during analysis of hyrax food. Ato Bamlaku Amente is acknowledged for his assistance in the preparation of the study area map. I would also like to express my appreciation to my friends of the Post-graduate Programme, Department of Zoological Sciences for their overall assistance during the course of my study. Lastly, but not least, I would like to thank my family for their moral support and encouragements throughout my study period. v DEDICATION I dedicate this dissertation to my lovely children, Merkeb Gebremeskel and Yishak Gebremeskel. vi TABLE OF CONTENTS Page Contents…………………...…………..……………………………...…………..….....vii List of Figures………………..………………………………………………….….…. x List of Tables……….………………….………………………………………….…....xiii List of Appendices………....…………………………………………………..……….xv 1. Introduction and literature review…………………..…………………...…………..1 1.1 Introduction…………………………………………………..……………………..1 1.2 Literature review………………………………………..………………………......8 Taxonomy……………………………….......………………………………….. 8 Physical characteristics and physiology……………………………………...…10 Distribution and habitat……………………………………………….……..….14 Social behaviour and grouping………………………………………………....17 Feeding behaviour and diet…………………………………..…………………21 Reproductive biology and behaviour………………………………………..….22 Communication…………………………………………………………………24 Threats……………...……………......………………………...………………..25 Conservation status……………………………………………………………..27 1.3 Justification of the study…………………………………………………………...28 1.4 Objectives of the study……………………………………………………..……... 30 1.4.1 General objective…………………………………………………………….30 1.4.2 Specific objectives………………………………………………...…………30 vii 1.5 Research questions……………………………..…………………………………....30 2. The study area and methods………………..…………………………….……...…32 2.1 Description of the study area……………………………..……………………...32 2.1.1 Geology and soil……………………………………………………………..33 2.1.2 Climate…………………………………………………………………….....34 2.1.3 Hydrology…………………………………………………………..………..36 2.1.4 Vegetation……………………………………………………………………37 2.1.5 Fauna…………………………………………………………………………38 2.1.6 Human settlement and land-use patterns…………………………………….39 2.2 Methods…………………………………………………………………………..41 2.2.1 Duration of the study……………………………………………………..…41 2.2.2 Data collection………………………………………………………………41 2.2.2.1 Distribution………………………………………………………...……42 2.2.2.2 Population census...………………………………………………….......43 2.2.2.3 Diet composition……………………...………………………………....59 2.2.2.4 Threats to rock hyrax…………………………………………………....71 2.2.3 Data analyses……………………………………………………………..…76 3. Results…………………………...………………………………………………..…78 3.1 Distribution ……………..…..……………………………………………………78 3.2 Population status……………………………………………………………….…83 3.3 Diet composition………………………………...………………………………..91 3.4 Threats to rock hyrax…………………………………………………………....108 3.4.1 Demographic and socio-economic characteristics of the respondents selected from Karari, Gojera and Hora Soba villages....................................................108 3.4.2 Respondents’ views on the population trend of rock hyrax …..…….…...……108 viii 3.4.3 Threats to the rock hyrax and the Park…………………………..…….……...109 3.4.4 Response about awareness of the local people on the Park, conservation and status and threats of the rock hyrax….……………………………………….119 3.4.5 Suggestions given by the respondents to ensure sustainability of wildlife and the Park………………………..……………………………….…….….….….121 4. Discussion……………...……………………………………………………………122 4.1 Distribution …………….……………………..…………………………………122 4.2 Population