干旱区生态环境知识资源中心(Arid): Striking habitat reduction, decreased genetic diversity, and imperilled conservation of natural populations of Terrapene coahuila

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DOI	10.1111/fwb.13681
	Striking habitat reduction, decreased genetic diversity, and imperilled conservation of natural populations of Terrapene coahuila
	Cortes-Rodriguez, Xochiquetzal; Borja-Martinez, Gabriela; Vazquez-Dominguez, Ella
通讯作者	Vazquez-Dominguez, E (corresponding author), Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Biodiversidad, Mexico City 04510, DF, Mexico.
来源期刊	FRESHWATER BIOLOGY
ISSN	0046-5070
EISSN	1365-2427
出版年	2021
卷号	66 期号:5 页码:842-858
英文摘要	1. Long-term evolutionary history and demographic processes shape current patterns of genetic variation in natural populations. Genetic diversity is of prime importance for the long-term survival of species, especially those threatened or endangered, which can be lost in a few generations and can take hundreds to recover. Notably, turtles are among the most endangered vertebrate taxa in the world. The Coahuilan box turtle Terrapene coahuila is the only aquatic species within the genus, microendemic to the desert-spring ecosystem of the Cuatrocienegas Basin (CCB). The CCB has experienced significant habitat changes during recent decades, fragmenting otherwise interconnected wetlands systems. We aimed to perform a detailed evaluation of the evolutionary and genetic patterns of T. coahuila, both historical and contemporary, linked to the biogeography of the CCB and processes governing the species distribution. 2. We assessed the contributions of historical and contemporary population demographic processes to genetic diversity and structure, by using two mitochondrial DNA genes (cytochrome b and d-loop), one nuclear gene (GAPD), and 12 nuclear microsatellite loci. We comprehensively analysed these data to address historical patterns of demography, migration, genetic diversity, and times of divergence across the valley for T. coahuila. We also evaluated recent patterns of genetic variation and structure, inbreeding, bottleneck signals, and effective population size. 3. Our results dated the time to the most recent common ancestor for T. coahuila in the CCB at c. 10.1 million years ago, with highest diversification during the Holocene. Structure consistently comprised two genetic clusters, Cuatrocienegas East and Cuatrocienegas West on either side of the main historical barrier, the Sierra San Marcos. Demographic results supported a divergence between western and eastern populations from 47,500 to 110,950 years ago, and colonisation of the southernmost Cuatrocienegas West distribution (Churince) 28,500-66,500 years ago, which experienced a recent bottleneck. All populations showed low values of haplotype and nuclear genetic diversity, migration, effective population size, and relatedness; significant inbreeding and bottleneck signals were also identified within genetic clusters. 4. In accordance with the biogeographic history of the basin, our results show that T. coahuila's diversification across the Cuatrocienegas valley continued throughout the Pleistocene, peaking during the Holocene, when the valley started to gradually dry. As predicted, T. coahuila exhibited an overall, long-term, and probably continuing decrement in genetic variation, increased genetic differentiation, and low population sizes, as a consequence of contemporary habitat loss and fragmentation across the CCB. 5. Changes in species demography and population connectivity have the potential to permanently alter the genetic patterns of freshwater species. Hence, given its restricted distribution, high habitat specificity and habitat loss, Terrapene coahuila is at utmost risk of extinction. Captive breeding programmes of the Coahuilan box turtle should consider our results, to prevent further loss of genetic diversity and truly expect reintroduction success. Also, it is crucial to restore connectivity among wetlands, for the conservation of species and the Cuatrocienegas valley altogether.
英文关键词	Coahuilan box turtle Cuatrocienegas valley endangered species freshwater turtle microendemic
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000613408600001
WOS类目	Ecology ; Marine & Freshwater Biology
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
来源机构	Universidad Nacional Autónoma de México
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350267
作者单位	[Cortes-Rodriguez, Xochiquetzal; Borja-Martinez, Gabriela; Vazquez-Dominguez, Ella] Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Biodiversidad, Mexico City 04510, DF, Mexico; [Cortes-Rodriguez, Xochiquetzal] Univ Nacl Autonoma Mexico, Posgrad Ciencias Biol, Mexico City, DF, Mexico
推荐引用方式 GB/T 7714	Cortes-Rodriguez, Xochiquetzal,Borja-Martinez, Gabriela,Vazquez-Dominguez, Ella. Striking habitat reduction, decreased genetic diversity, and imperilled conservation of natural populations of Terrapene coahuila[J]. Universidad Nacional Autónoma de México,2021,66(5):842-858.
APA	Cortes-Rodriguez, Xochiquetzal,Borja-Martinez, Gabriela,&Vazquez-Dominguez, Ella.(2021).Striking habitat reduction, decreased genetic diversity, and imperilled conservation of natural populations of Terrapene coahuila.FRESHWATER BIOLOGY,66(5),842-858.
MLA	Cortes-Rodriguez, Xochiquetzal,et al."Striking habitat reduction, decreased genetic diversity, and imperilled conservation of natural populations of Terrapene coahuila".FRESHWATER BIOLOGY 66.5(2021):842-858.