es_100_lecture_6-1

Life are there management actions that can are help

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Unformatted text preview: Modeling Population Viability for the Desert Tortoise in the Western Mojave Desert Daniel Doak, Peter Kareiva, and Brad Klepetka Ecological Applications Summarized data taken over 15 years in several different studies 8 stages in life based on carapace size size Yearling Yearling Juvenile 1 & 2 Immatures 1 & 2 Adults (3 size classes) Transition probabilities Transition GROWTH = SLOW. Animals tend to stay in same size class. •Reproduction widely variable across populations •Can run model with any of the 4 reproductive rates Desert Tortoise conclusions Desert Animals tend to stay in size class (growth Animals = slow) slow) Survival probability in stages 6 and 7, Survival when reproduction is highest is important when Reproduction widely variable among Reproduction populations populations Can run models with different fecundity values Can ALL MODELS SHOW POP. DECLINE even ALL with best reproductive values with D.T. conclusions…con...
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This note was uploaded on 12/25/2009 for the course ENV S 100 taught by Professor Staff during the Fall '08 term at UCSB.

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