Observations on the Life Cycles of Painted Turtles (Genus Chrysemys)

Cagle, Fred R.

doi:10.2307/2422060

Cited by 64 publications

(35 citation statements)

References 12 publications

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“…From this result, it can be speculated that the females of C. Chrysemys picta (Cagle, 1954;Wilbur, 1975;MacCulloch and Secoy, 1983), Clemmys guttata (Ernst, 1976), and Mauremys japonica (Yabe, 1989).…”

Section: Resultsmentioning

confidence: 90%

Population Structure and Male Melanism in the Reeves' Turtle, <i>Chinemys reevesii</i>

Yabe

1994

Jpn.J.Herpetol.

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Mark-recapture study on a population of Reeves' turtle, Chinemys reevesii, was conducted at two adjacent ponds in the southwestern part of Gifu Prefecture. A total of 111 turtles was marked during the period from 1986 to 1987, comprising 42 males, 68 females, and one young individual. It was speculated from the age structure that females lived longer on average than males. The females were larger than the males, growing to more than 200mm in carapace length (CL), whereas the males grew to about 160mm in CL. Melanistic individuals occurred only in males. Submelanistic males were six to nine years old and their mean CL was 140.3mm. Melanistic males were older than six years and larger than 120mm in CL. The mean CL of melanistic males was 149.6mm.

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Section: Resultsmentioning

confidence: 90%

Population Structure and Male Melanism in the Reeves' Turtle, <i>Chinemys reevesii</i>

Yabe

1994

Jpn.J.Herpetol.

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“…Sex was determined by examining the position of the cloaca relative to the margin of the carapace by stretching the tail straight back. Turtles with the cloacal opening beyond the posterior margin of carapace were judged to be males, and those with the cloacal opening within the margin of the carapace, females (Cagle, 1954), but the tails of juvenile turtles could not be extended to determine sex in many cases.…”

Section: Population Surveymentioning

confidence: 99%

Female-biased Mortality and Its Consequence on Adult Sex Ratio in the Freshwater Turtle Chinemys reevesii on an Island.

Takenaka

Hasegawa

2001

Curr.Herpetol.

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A mark-recapture study of the fresh water turtle Chinemys reevesii was conducted on a small (190 ha) island, Ishima Island, off the east coast of Shikoku to learn the demographic characteristics of an insular turtle population. Most of the Chinemys reevesii on the island were marked, yielding a reliable estimate of population size (1179 turtles per 15 ha aquatic habitats).The estimated sex ratio of the turtles in the younger age class (3-6 yr) was essentially equal, slightly skewed toward males in a higher age class, and significantly male-biased in the older age class (>12yr).A significantly female-biased sex ratio among the turtles found dead was compatible with the male-biased sex ratio in adult turtles. Possible physiological and ecological factors for change in sex ratio with age are discussed with consideration of the insular environment.

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“…The curved carapace length (CCL; mm) and sex of captured western painted turtles were recorded for all captured turtles. The CCL was measured with a flexible metal measuring tape and the sex of each turtle determined by observation of secondary sexual characteristics including foreclaw length and precloacal tail length (Cagle 1954;Gibbons 1968;Ernst 1971a;Gibbons & Lovich 1990;Mitchell 1994;Rowe 1997). Sex of western painted turtles <10 cm CCL is difficult to differentiate using secondary sexual characteristics; therefore, they were classified as undetermined.…”

Section: Nettingmentioning

confidence: 99%

Condition and mortality of western painted turtle collected as bycatch in modified fyke nets during fish population assessments

Moos¹,

Blackwell²

2017

Journal of Freshwater Ecology

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Information concerning turtle bycatch and its possible ramifications during biological sampling in freshwater systems is limited. Having such information will enable fisheries researchers and managers to modify fish sampling procedures to potentially minimize any impacts on turtle populations. Therefore, our objective was to utilize reflex response to characterize stress and mortality of western painted turtles (Chrysemys picta bellii) captured as bycatch in modified fyke nets during fish population assessments. Reflex-response-based condition classification (i.e. good, poor, unresponsive) data were collected from May to September during fish population assessments in 38 lakes and seven impoundments in northeast South Dakota from 2012 to 2014. We evaluated the relationship between observed condition and water temperature during two time periods, by turtle gender and size. Turtle bycatch mortality was assessed from June to September during fish population assessments in 14 lakes and three impoundments during 2013 and 2014. Delayed (i.e. overnight) mortality was determined for poor and unresponsive condition classifications and the relationship between observed mortality and water temperature for two time periods, by turtle gender and size was evaluated. Turtle condition decreased as water temperature increased. Condition was poorer during the May and June time period than August and September. Female turtles were in significantly worse condition than males. Condition was not related to turtle size. We observed varying mortality rates across condition classifications and the total estimated delayed mortality rate of known sex turtles was 36.4%. Mortality increased as temperature increased. Delayed mortality rates varied between the two sampling periods with higher mortality rates during the May and June time period. Female turtles had higher mortality rates than males. Delayed mortality did not vary by turtle size. Understanding the negative effects on bycatch during biological sampling is important to provide justification for the development and implementation of measures to protect non-target species.

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Observations on the Life Cycles of Painted Turtles (Genus Chrysemys)

Cited by 64 publications

References 12 publications

Population Structure and Male Melanism in the Reeves' Turtle, <i>Chinemys reevesii</i>

Population Structure and Male Melanism in the Reeves' Turtle, <i>Chinemys reevesii</i>

Female-biased Mortality and Its Consequence on Adult Sex Ratio in the Freshwater Turtle Chinemys reevesii on an Island.

Condition and mortality of western painted turtle collected as bycatch in modified fyke nets during fish population assessments

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