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Southern Gerenuk Southern Gerenuk Population Biologist Nicole Clausen, (Litocranius walleri) [email protected] AZA Animal Program AZA SSP Coordinator/ Studbook Keeper Christina Seely, Population Viability [email protected] Analysis Report AZA SSP Vice-C oordinator Manda Butler [email protected] AZA Antelope & Giraffe TAG Vice-Chair Sharon Joseph, [email protected] AZA Antelope & Giraffe TAG Chair Martha Fischer, [email protected] Photo by: Deidre Lantz th December 20 , 2013 TABLE OF CONTENTS Table of Contents ............................................................................................................................................................................................................. 1 Executive Summary .......................................................................................................................................................................................................... 2 Population Viability Analysis (PVA) Model Description .................................................................................................................................................... 3 Population’s Demographic Background ........................................................................................................................................................................... 4 PVA Model Setup ............................................................................................................................................................................................................. 5 Starting Population: .................................................................................................................................................................................................... 5 Age Structure: ............................................................................................................................................................................................................. 5 Current Demographics and Genetics: .............................................................................................................................................................................. 6 Reproduction: ............................................................................................................................................................................................................. 6 Mortality: .................................................................................................................................................................................................................... 6 Genetic Management: ................................................................................................................................................................................................ 7 Inbreeding Depression: .............................................................................................................................................................................................. 7 MODEL SCENARIOS .......................................................................................................................................................................................................... 9 BASELINE MODELS ......................................................................................................................................................................................................... 10 If Conditions Remain the Same ........................................................................................................................................................................... 10 ALTERNATE MODEL SCENARIOS ..................................................................................................................................................................................... 13 Alternate Mortality Rates ................................................................................................................................................................................... 13 ALTERNATE MODEL SCENARIOS ..................................................................................................................................................................................... 14 Increased Female Probability of Breeding [p(B)] ................................................................................................................................................. 14 ALTERNATE MODEL SCENARIOS ..................................................................................................................................................................................... 16 Importing Individuals .......................................................................................................................................................................................... 16 ALTERNATE MODEL SCENARIOS ..................................................................................................................................................................................... 17 Import for Artificial Insemination........................................................................................................................................................................ 17 ALTERNATE MODEL SCENARIOS ..................................................................................................................................................................................... 18 Varying Space ...................................................................................................................................................................................................... 18 ALTERNATE MODEL SCENARIOS ..................................................................................................................................................................................... 19 No Genetic Management .................................................................................................................................................................................... 19 ALTERNATE MODEL SCENARIOS ..................................................................................................................................................................................... 20 Combining Multiple Management Actions – Space and Increased Female p(B) – AZA only ............................................................................... 20 Genetic Results Across Scenarios ................................................................................................................................................................................... 22 Risk Results .................................................................................................................................................................................................................... 23 Management Actions ..................................................................................................................................................................................................... 24 Conclusions .................................................................................................................................................................................................................... 24 Acknowledgements ........................................................................................................................................................................................................ 25 Appendix A. Literature Cited .......................................................................................................................................................................................... 26 Appendix B. Studbook Data Exports ............................................................................................................................................................................... 27 Appendix C. ZooRisk PVA Model Setup .......................................................................................................................................................................... 27 Appendix D. Risk Categories And Results ....................................................................................................................................................................... 28 Appendix e. Overall Results Table .................................................................................................................................................................................. 29 Appendix F. Included Individuals .................................................................................................................................................................................... 29 Appendix G. Male and Female Mortality Rates (Qx) ..................................................................................................................................................... 32 Appendix H. Inbreeding.................................................................................................................................................................................................. 33 Appendix I. Definitions ..................................................................................................................................................................................................
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