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Conservation implications of somatic growth and length-at-age in Pseudemys gorzugi, Rio Grande Cooter

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Abstract

Conservation decisions are often based on population models that rely on underlying assumptions made about species' demographic parameters. The Rio Grande Cooter (Pseudemys gorzugi) is a conservation-dependent riverine turtle, but our understanding of its population dynamics has been limited due to the absence of long-term surveys. We used mark-recapture data collected between 2016 and 2022 from the Black River, New Mexico, USA, to evaluate P. gorzugi somatic growth parameters. Females reached larger maximum size than males but exhibited a slower growth rate. We observed only a slight difference in maximum length and Brody growth coefficient of turtles from different locations, but the growth coefficients were overall significantly lower than any other Pseudemys species. Turtles on the Black River represent the northernmost robust population of P. gorzugi. In light of the intense human use of the river and riparian areas coupled with the impacts of climate change, it is imperative to maintain commitment to conservation efforts to resist population declines given the slow somatic growth rate of the population.

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Data availability

The data cannot be shared publicly as it may compromise the locations of species of conservation concern and the private properties where the study was conducted. However, data can be made available upon reasonable requests.

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Acknowledgements

We would like to thank the New Mexico Department of Game and Fish, United States Fish and Wildlife Service, and Eastern New Mexico University for funding this research. Furthermore, we would also like to thank private landowners and the BLM for allowing us to conduct research on their land. We also thank Alissa A. Kreikemeier, Andrew W. Letter, Jessica L. Curtis, Vinicius Orterga-Berno, Laramie B. Mahan, Jazmin R. Mirabal, Korry J. Waldon, and many others for their help with turtle surveys. This research was conducted under New Mexico Department of Game and Fish Scientific Research Permit Authorization No. 3621 and Eastern New Mexico University Institutional Animal Care and Use Committee Permit No. 03-02/2016, 04-27/2018, and 2019-0226-01A1

Funding

This research was supported by the New Mexico Department of Game and Fish, U.S. Fish and Wildlife Service, Eastern New Mexico University.

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Author notes

  1. Thanchira Suriyamongkol and Zachary A. Siders are co-first authors.

Authors and Affiliations

  1. Cooperative Wildlife Research Laboratory and Department of Agricultural Sciences, Southern Illinois University, Carbondale, IL, USA

    Thanchira Suriyamongkol

  2. Fisheries and Aquatic Sciences, School of Forest, Fisheries, and Geomatic Sciences, University of Florida, Gainesville, FL, USA

    Zachary A. Siders

  3. Department of Forestry and Environmental Resources, Fisheries Wildlife and Conservation Biology Program, North Carolina State University, Raleigh, NC, USA

    Ivana Mali

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  1. Thanchira Suriyamongkol
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by IM, ZAS, and TS. The first draft of the manuscript was written by IM, ZAS, and TS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Thanchira Suriyamongkol.

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Ethical Statement

Research involving Animals- Animal handling and data collection were conducted under Eastern New Mexico Universiy IACUC permit numbers: 03-02/2016, 04-27/2018, and 2019-0226-010A and the New Mexico Department of Game and Fish permit number 3621.

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Suriyamongkol, T., Siders, Z.A. & Mali, I. Conservation implications of somatic growth and length-at-age in Pseudemys gorzugi, Rio Grande Cooter. Hydrobiologia (2024). https://doi.org/10.1007/s10750-024-05486-6

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