Potential effects of highway mortality and habitat fragmentation on a population of painted turtles in Montana E9CBC35D-17E7-4C00-9213-03EFBB0C4692 Year: 2006 0) E > o o >• re n o Long Distance btwn Complexes •Short Distance btwn Complexes Temp. Emigration - To Off-Complex Winter/Early Early Summer Late Summer Spring Season Figure 7. Movement estimates for adult turtles by season for various types of movements. Bars represent standard errors. Probability of Survival To assess variation in survival probabilities within pond complexes, factors
Potential effects of highway mortality and habitat fragmentation on a population of painted turtles in Montana E9CBC35D-17E7-4C00-9213-03EFBB0C4692 Year: 2006 0) E > o o >• re n o Long Distance btwn Complexes •Short Distance btwn Complexes Temp. Emigration - To Off-Complex Winter/Early Early Summer Late Summer Spring Season Figure 7. Movement estimates for adult turtles by season for various types of movements. Bars represent standard errors. Probability of Survival To assess variation in survival probabilities within pond complexes, factors affecting probability of movement and capture were held constant. Within the candidate set of models, 2 models with alternative survival variables were within 2 QAICc of the best approximating model (Table 6). These best approximating models indicated that pond, season, and time (either drought or time over the study) were important factors affecting the probability of survival (Table 6). Survival was not influenced by distance to road (AQAICc = ) or by specific pond (AQAICc = ). Season consists of the intervals between trapping sessions: 'winter' is 9 months from September to May; 'early summer' is months from about late May to July; and 'late summer' is months from about mid-July to late August. Weighted average apparent seasonal survival rates ranged from a high of (SE = ) in ponds B and C which retained water during the drought to a low of (SE = ) in pond E which virtually dried up (Table 7). Survival rates in all pond complexes were higher overwinter than during summer 24
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