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DESERT TORTOISE CONCEPTUAL MODEL

DESERT TORTOISE CONCEPTUAL MODEL. PHILIP A. MEDICA. U.S. FISH & WILDLIFE SERVICE. ACKNOWLEDGMENTS. Todd Esque, U.S. Geological Survey, Las Vegas Field Station, Las Vegas, NV John Hamill, U.S. Department of Interior, Barstow, CA

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DESERT TORTOISE CONCEPTUAL MODEL

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  1. DESERT TORTOISE CONCEPTUAL MODEL PHILIP A. MEDICA U.S. FISH & WILDLIFE SERVICE

  2. ACKNOWLEDGMENTS Todd Esque, U.S. Geological Survey, Las Vegas Field Station, Las Vegas, NV John Hamill, U.S. Department of Interior, Barstow, CA Debra Hughson, National Park Service, Mojave National Preserve, Barstow, CA Robert Fulton, California State University, Desert Studies Center, Zzyzx, CA Jim Andre’, University of California, Riverside, Granite Mountain Desert Research Center, Kelso, CA

  3. OBJECTIVE: The objective of the Desert Tortoise Conceptual Model is to guide the development of a multifaceted, ecologically adaptive, predictive tool. This model will assist in predicting the population fluctuations with varying environmental inputs that impact survivorship, reproduction, longevity, as well as population structure and function. This Model will assist in the evaluation of desert tortoise recovery rangewide, and will be usable as a predictive tool for the evaluation of management practices.

  4. ABIOTIC FACTORS DESERT TORTOISE POPULATIONS BIOTIC FACTORS

  5. CLIMATE RAINFALL ABIOTIC FACTORS ABIOTIC FACTORS WIND/DUST SOLAR RADIATION TEMPERATURE ENSO & PDSO GEOMORPHOLOGY CATASTROPHIC EVENTS AGE SLOPE ELEVATION ASPECT SUBSTRATE

  6. SUBSTRATE CHEMICAL COMPOSITION CRYPTO- BIOTIC CRUST SOIL TYPE BURROWING QUALITIES TEXTURE STRUCTURE

  7. DESERT TORTOISE HABITAT COMPONENTS VEGETATION BIOTIC FACTORS MICROORGANISMS DISEASE PARASITES PREDATORS NATURAL HISTORY

  8. POPULATION DENSITY REPRODUCTIVE POTENTIAL FOOD/WATER GROWTH LONGEVITY ACTIVITY TORTOISE NATURAL HISTORY HOME RANGE BEHAVIOR DISPERSAL SEX/AGE RATIO MORTALITY GENETICS MORPHOLOGY NATALITY PREDATORS HABITAT SELECTION PARASITES

  9. AGE/SIZE AT SEXUAL MATURITY REPRODUCTIVE POTENTIAL LONGEVITY CLUTCH SIZE CLUTCH FREQUENCY

  10. HUMAN RELATED IMPACTS UPON DESERT TORTOISE POPULATIONS AGRICULTURE COLLECTION DESERTIFICATION DUMPS/LANDFILLS EXOTICS FIRE GRAZING GENETIC ISOLATION HABITAT FRAGMENTATION MINING NOISE OHV’S POLLUTION RECREATION RELEASE OF CAPTIVES RESEARCERS ROADS SHOOTING URBANIZATION TORTOISE

  11. From: S. Payne. 1974. Terrestrial model: Animal Processes (Version III). U.S. IBP Desert Biome Report

  12. Ephemeral Plants Abiotic Factors Tortoise Reproduction Natality Desert Tortoise Population Mortality Parasites Diseases Decomposers

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