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5 November 2019 Aspects of the Reproductive Biology of the Rio Grande Cooter (Pseudemys gorzugi) on the Black River, New Mexico
Thanchira Suriyamongkol, Ivana Mali
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The Rio Grande cooter (Pseudemys gorzugi), the westernmost species of the genus Pseudemys, is a riverine turtle native to the lower Rio Grande River basin and its tributaries. Currently, P. gorzugi is under review by the US Fish and Wildlife Service for federal protection. However, very little is known about any aspect of this species' ecology and natural history, posing challenges to the assessment of its conservation status. To fill in these knowledge gaps, we studied female size at maturity, clutch size and mean egg size, correlation between reproductive output and female size, and reproductive seasonality of P. gorzugi from mid-May to mid-August 2018. We captured P. gorzugi on the Black River, New Mexico, using traditional hoop net traps and snorkeling. Of 155 females, 28 contained oviductal follicles and 16 contained shelled eggs. We observed a high proportion of gravid females at the end of May through mid-June, although the egg development cycle may extend into August. Our findings allow for a better understanding of this poorly studied species. Knowledge on seasonality of egg development and deposition can aid management planners in determining appropriate times for implementing protection for nesting females and nesting sites.

© 2019 Chelonian Research Foundation
Thanchira Suriyamongkol and Ivana Mali "Aspects of the Reproductive Biology of the Rio Grande Cooter (Pseudemys gorzugi) on the Black River, New Mexico," Chelonian Conservation and Biology 18(2), 187-194, (5 November 2019).
Received: 1 April 2019; Accepted: 10 August 2019; Published: 5 November 2019
egg development
reproductive seasonality
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