. The Canadian field-naturalist. 244 The Canadian Field-Naturalist Vol. 106 Table 1. Sizes and body masses of juvenile and young adult Snapping Turtles of known age from all aquatic areas on the E. S. George Reserve [data include means and (ISE)]. Age N Carapace length (mm) Plastron length (mm) Weight (g) 0 1 2 3 4 5 6 7 8 9 10 11 12 871 43 38 70 61 56 65 47 53 33 41 25 26 () () () () () () () () () () () () () () () () () () 1
. The Canadian field-naturalist. 244 The Canadian Field-Naturalist Vol. 106 Table 1. Sizes and body masses of juvenile and young adult Snapping Turtles of known age from all aquatic areas on the E. S. George Reserve [data include means and (ISE)]. Age N Carapace length (mm) Plastron length (mm) Weight (g) 0 1 2 3 4 5 6 7 8 9 10 11 12 871 43 38 70 61 56 65 47 53 33 41 25 26 () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () () Test; D/= II, P = ). Marsh depth at point of capture had a positive linear relationship with mean age of turtles captured (Figure 2). Painted Turtles showed similar relationships of age to marsh depth. Males and females below the age of six years increased in size and body mass (Table 2a,b). However, growth slows as males approach maturity at age four, whereas growth of females does not slow until they reach minimum age at sexual maturity at age seven (Sexton 1959; Gibbons 1968; Ernst 1971; Wilbur 1975; Tinkle et al. 1981). Painted Turtles of different ages were cap- tured at significantly different water depths (ANOVA; F554 = , P = ). Mean water depth at the point of capture increased in the follow- ing rank order by age: two, one, three, four, six, and five years. Water depth at age two was not different from those at ages one and three (MRT; P > ), but was significantly different from those for ages four and older (MRT; P < ). Similar age differ- 65-r. I I I I I I I I I I I I I 0 123456789 10 1112 13 AGE (yr) Figure 2. The relationship between Snapping Turtle age a
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