. Ecology of a population of desert tortoises, Gopherus agassizi, in Ward Valley, California . 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 Schnab

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. Ecology of a population of desert tortoises, Gopherus agassizi, in Ward Valley, California . 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

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