Annual variations in reproductive characteristics of painted turtles (Chrysemys picta)

Schwarzkopf, Lin, and Brooks, Ronald J. (1986) Annual variations in reproductive characteristics of painted turtles (Chrysemys picta). Canadian Journal of Zoology, 64 (5). pp. 1148-1151.

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In Algonquin Park, Ontario, body size and clutch characteristics were recorded for 51 female painted turtles (Chrysemyspicta) in 1983, 61 in 1984, and 24 in 1985. Clutch size, clutch mass, and egg width correlated significantly with body size (carapace length) in all 3 years. Egg length and egg mass were significantly related to body size in 1984 and 1985, but not in 1983. There were no significant correlations of egg width or egg mass to clutch size. For a group of the same individuals compared by repeated-measures ANOVA, mean clutch mass and mean egg size, but not mean clutch size, varied significantly among years. Correlation of egg size with body size, lack of correlation between egg size and clutch size, and annual variation in egg size, but not clutch size, all fail to support current versions of optimal egg size theory. Twenty-six females nested in both 1983 and 1984 and 11 females nested in both 1984 and 1985. Fourteen females nested twice in 1 year: six in 1983 and eight in 1984. Between 43 and 73% of adult females nested in a given year and 12–13% nested twice in a single season. These estimates are similar to those reported for other populations of this species. It appears that variations in both clutch size (frequency) and egg size are important sources of variation in reproductive output.

Item ID: 36437
Item Type: Article (Research - C1)
ISSN: 1480-3283
Funders: Natural Sciences and Engineering Research Council of Canada (NSERC), Canadian National Sportsmen's Fund (CNSF)
Projects and Grants: NSERC Grant A5990
Date Deposited: 22 Feb 2016 01:24
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060207 Population Ecology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity @ 100%
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