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Espindola S, Vázquez-Domínguez E, Nakamura M, Osorio-Olvera L, Martínez-Meyer E, Myers EA, Overcast I, Reid BN, Burbrink FT. Complex genetic patterns and distribution limits mediated by native congeners of the worldwide invasive red-eared slider turtle. Mol Ecol 2022; 31:1766-1782. [PMID: 35048442 DOI: 10.1111/mec.16356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 12/01/2021] [Accepted: 01/12/2022] [Indexed: 11/30/2022]
Abstract
Non-native (invasive) species offer a unique opportunity to study the geographic distribution and range limits of species, wherein the evolutionary change driven by interspecific interactions between native and non-native closely related species is a key component. The red-eared slider turtle, Trachemys scripta elegans (TSE), has been introduced and successfully established worldwide. It can coexist with its native congeners T. cataspila, T. venusta and T. taylori in Mexico. We performed comprehensive fieldwork, executed a battery of genetic analyses and applied a novel species distribution modeling approach to evaluate their historical lineage relationships and contemporary population genetic patterns. Our findings support the historical common ancestry between native TSE and non-native (TSEalien ), while also highlighting the genetic differentiation of the exotic lineage. Genetic patterns are associated with their range size/endemism gradient, the microendemic T. taylori showed significant reduced genetic diversity and high differentiation, whereas TSEalien showed the highest diversity and signals of population size expansion. Counter to our expectations, lower naturally occurring distribution overlap and little admixture patterns were found between TSE and its congeners, exhibiting reduced gene flow and clear genetic separation across neighboring species despite having zones of contact. We demonstrate that these native Trachemys species have distinct climatic niche suitability, likely preventing establishment of and displacement by the TSEalien . Moreover, we found major niche overlap between TSEalien and native species worldwide, supporting our prediction that sites with closer ecological optima to the invasive species have higher establishment risk than those that are closer to the niche-center of the native species.
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Affiliation(s)
- Sayra Espindola
- Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, México.,Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, México
| | - Ella Vázquez-Domínguez
- Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, México.,American Museum of Natural History, Central Park West, 79th Street, New York, 10024, USA
| | - Miguel Nakamura
- Centro de Investigación en Matemáticas (CIMAT), Calle Jalisco S/N, Colonia Valenciana, 36023, Guanajuato, Guanajuato, México
| | - Luis Osorio-Olvera
- Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, México
| | - Enrique Martínez-Meyer
- Instituto de Biología, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, México
| | - Edward A Myers
- Department of Biological Sciences, Clemson University, Clemson, SC, 29634, USA.,American Museum of Natural History, Central Park West, 79th Street, New York, 10024, USA
| | - Isaac Overcast
- Institut de Biologie de l'Ecole Normale Superieure, 75005, Paris, France
| | - Brendan N Reid
- Rutgers University, Department of Ecology, Evolution, and Natural Resources, 14 College Farm Road, New Brunswick, NJ, USA
| | - Frank T Burbrink
- American Museum of Natural History, Central Park West, 79th Street, New York, 10024, USA
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Hill KGW, Nielson KE, Tyler JJ, McInerney FA, Doubleday ZA, Frankham GJ, Johnson RN, Gillanders BM, Delean S, Cassey P. Pet or pest? Stable isotope methods for determining the provenance of an invasive alien species. NEOBIOTA 2020. [DOI: 10.3897/neobiota.59.53671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The illegal pet trade facilitates the global dispersal of invasive alien species (IAS), providing opportunities for new pests to establish in novel recipient environments. Despite the increasing threat of IAS to the environment and economy, biosecurity efforts often lack suitable, scientifically-based methods to make effective management decisions, such as identifying an established IAS population from a single incursion event. We present a proof-of-concept for a new application of a stable isotope technique to identify wild and captive histories of an invasive pet species. Twelve red-eared slider turtles (Trachemys scripta elegans) from historic Australian incursions with putative wild, captive and unknown origins were analysed to: (1) present best-practice methods for stable isotope sampling of T. s. elegans incursions; (2) effectively discriminate between wild and captive groups using stable isotope ratios; and (3) present a framework to expand the methodology for use on other IAS species. A sampling method was developed to obtain carbon (δ13C) and nitrogen (δ15N) stable isotope ratios from the keratin layer of the carapace (shells), which are predominantly influenced by dietary material and trophic level respectively. Both δ13C and δ15N exhibited the potential to distinguish between the wild and captive origins of the samples. Power simulations demonstrated that isotope ratios were consistent across the carapace and a minimum of eight individuals were required to effectively discriminate wild and captive groups, reducing overall sampling costs. Statistical classification effectively separated captive and wild groups by δ15N (captive: δ15N‰ ≥ 9.7‰, minimum of 96% accuracy). This study outlines a practical and accessible method for detecting IAS incursions, to potentially provide biosecurity staff and decision-makers with the tools to quickly identify and manage future IAS incursions.
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Lee KH, Chen TH, Shang G, Clulow S, Yang YJ, Lin SM. A check list and population trends of invasive amphibians and reptiles in Taiwan. Zookeys 2019; 829:85-130. [PMID: 30914838 PMCID: PMC6422934 DOI: 10.3897/zookeys.829.27535] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 01/24/2019] [Indexed: 02/07/2023] Open
Abstract
Invasive species have impacted biodiversity all around the world. Among various ecosystems, islands are most vulnerable to these impacts due to their high ratio of endemism, highly specialized adaptation, and isolated and unique fauna. As with other subtropical islands, Taiwan faces constant risk of biological invasions and is currently ranked as one of the countries most affected by invasive amphibians and reptiles. In this paper, a comprehensive checklist of all known exotic amphibians and reptiles is provided, including twelve species which have successfully colonized Taiwan and six species with a controversial status. We provide an update on the knowledge of all these species including their distribution, colonization history, threats to native animals, and population trends based on literature records, fauna surveys, and data collected during invasive species eradication and control programs. A list of species with high invasive potentials is also provided. This study reports, for the first time, a comprehensive survey of invasive herpetofauna in Taiwan, which should provide a valuable reference to other regions which might suffer from similar invasion risk.
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Affiliation(s)
- Ko-Huan Lee
- School of Life Science, National Taiwan Normal University, Taipei 116, Taiwan
- Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia
| | - Tien-Hsi Chen
- Institute of Wildlife Conservation, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
| | - Gaus Shang
- Department of Biotechnology, Ming Chuan University, Taoyuan 333, Taiwan
| | - Simon Clulow
- Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia
| | - Yi-Ju Yang
- Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien 974, Taiwan
| | - Si-Min Lin
- School of Life Science, National Taiwan Normal University, Taipei 116, Taiwan
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