. Ecology of a population of desert tortoises, Gopherus agassizi, in Ward Valley, California . N Active - 18 Basking - 4 Retreat - 22 nctive - 41 Basking - 14 Retreat - 16 Active - 51 Basking - 17 Retrea t - 16 Active - 8 Basking - 4 Retreat - 9 O O o o o o o o o o \C CD O (N *3" O O t-i rH iH i â i o o o o VD 00 o o o Time (PST) Figure 9. Tortoise activity relative to time of day in March through June. /\/\/\ represents active tortoises, |'.;:'^V':1 repre- sents basking and | | represents retreat. Many tortoises were active in windspeeds (= 20 mph). Two tortoises were active durin
. Ecology of a population of desert tortoises, Gopherus agassizi, in Ward Valley, California . N Active - 18 Basking - 4 Retreat - 22 nctive - 41 Basking - 14 Retreat - 16 Active - 51 Basking - 17 Retrea t - 16 Active - 8 Basking - 4 Retreat - 9 O O o o o o o o o o \C CD O (N *3" O O t-i rH iH i â i o o o o VD 00 o o o Time (PST) Figure 9. Tortoise activity relative to time of day in March through June. /\/\/\ represents active tortoises, |'.;:'^V':1 repre- sents basking and | | represents retreat. Many tortoises were active in windspeeds (= 20 mph). Two tortoises were active during rain, although one burrowed tortoise was also found during rain. Two burrowed tortoises were observed in April and June at T of and °C at 0630 and 1048 h, respectively, gs Retreat at preferred activity times and temperatures may be an indication that all tortoises are not active daily (Berry, personal communication; Karl, 1979b). Activity increased in April and May, of all sighted tortoises (n = 84) and (n = 71), respectively, over that in March, (n = 21). It decreased again in June, (n = 44). Burrows may have been used more for midday retreats as
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