. Ecology of a population of desert tortoises, Gopherus agassizi, in Ward Valley, California. Desert tortoise; Turtles; Reptile populations. If the curve of absolute density is extended (by estimation) to the point where recaptures equal captures, then the popu- lation estimate is 59 to 64 tortoises per square kilome- 2 ter (150 to 165 tortoises/mile ). 20CX Curve A-Total number of tor- toises marked to interval Curve B- R:T X 100 for inter- val 100 Est imated Conelusion Y = X + 15 10 15 18 Consecutive 5-day intervals Figure 2. Progressive proportion of recaptures (R) to total da
. Ecology of a population of desert tortoises, Gopherus agassizi, in Ward Valley, California. Desert tortoise; Turtles; Reptile populations. If the curve of absolute density is extended (by estimation) to the point where recaptures equal captures, then the popu- lation estimate is 59 to 64 tortoises per square kilome- 2 ter (150 to 165 tortoises/mile ). 20CX Curve A-Total number of tor- toises marked to interval Curve B- R:T X 100 for inter- val 100 Est imated Conelusion Y = X + 15 10 15 18 Consecutive 5-day intervals Figure 2. Progressive proportion of recaptures (R) to total daily captures (T) for consecutive 5-day intervals during the study period (curve B) compard to absolute density increase per consecutive interval (curve A). As the plot was covered only twice, a standard mark- recapture calculation ( Lincoln Index; Marten Regres- sion Method, 1970; Hayne modified Lincoln Index, 1949) could not be applied. However, a Schnabel (1938) calcula- tion, which uses cumulative, daily population estimates and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Karl, Alice; United States. Dept. of the Interior. Bureau of Land Management. [S. l. : s. n. ]
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