. Bulletin. Science; Natural history; Natural history. CONSERVATION OF DIPODOMYS STEPHENS! 27 100 ^ 13 Q- "^ S. ^ O o ⢠w 'â =. 'w -Q <D O Q. o CL. Log [Initial Female Population] Fig. 9. Probability of population persistence for 50, 100, and 200 years as a function of natural log of initial female population size. Error bars are one standard deviation around the mean. decreases as greater lengths of time are considered. However, all three curves level off when initial female population sizes are greater than 10^^^, indicating that beyond this point, fu
. Bulletin. Science; Natural history; Natural history. CONSERVATION OF DIPODOMYS STEPHENS! 27 100 ^ 13 Q- "^ S. ^ O o ⢠w 'â =. 'w -Q <D O Q. o CL. Log [Initial Female Population] Fig. 9. Probability of population persistence for 50, 100, and 200 years as a function of natural log of initial female population size. Error bars are one standard deviation around the mean. decreases as greater lengths of time are considered. However, all three curves level off when initial female population sizes are greater than 10^^^, indicating that beyond this point, further increases in initial population size do not substantially improve persistence probabilities over each time period. Table 4 summarizes the results of Figure 9 at some convenient points, and presents the results for selected combinations of persistence probability and mod- eled time span. Because the program only considers females, and 1:1 sex ratios typically occur in natural populations, the MVP estimates from the model must be doubled to include males. This correction was made for the values in Table 4. Planning for Persistence The MVP sizes resulting from the BOOMBUST model refer to geographically continuous populations of potentially interbreeding individuals. Such populations of D. stephensi can only be realized and sustained if reserves sufficiently large to support the recommended population size are protected. The observed population densities and the sizes of currently occupied sites, along with the selected MVP size, provide the basis for identifying areas in which protection of D. stephensi would best be focused. Table 4. Initial population sizes needed to achieve various probabilities of persistence for different periods of time, according to BOOMBUST model results. Probability of persistence 50 year 100 year 200 year 95% 90% 75% 5261 2193 833 13,214 4798 1205 24,605 8934 2094. Please note that these images are extracted from scanned page images that may hav
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