期刊
GLOBAL ECOLOGY AND CONSERVATION
卷 36, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.gecco.2022.e02131
关键词
Amphibian; Conservation; Environmental DNA; eDNA; Notophthalmus meridionalis; Species detection
资金
- Natural Resources Program
- Texas Comptroller of Public Accounts [18-6656CS]
- U.S. Fish and Wildlife Service [21530-20-7, 2021-LA-028, STRC-12-17-18-CJP]
- Texas Parks and Wildlife Department [2020_R2_RGV_04, 2018_R2_RGV_07]
- Nature Conservancy, Sabal Palm Sanctuary, National Park Service [PAAL-2021-SCI-0001]
- East Foundation
- Coastal Bend Bays and Estuaries Program, Coastal Bend College
The Black-spotted Newt is a poorly studied salamander species, but the use of eDNA surveys in south Texas successfully detected its distribution and identified previously unreported or long-unobserved localities.
The Black-spotted Newt (Notophthalmus meridionalis) is a chronically understudied salamander species, with many aspects of its natural history, ecology, and distribution poorly known. Pre-vious studies using traditional methodologies have had limited success documenting N. meridionalis on the landscape, detecting individuals at 6% (7 of 114) and 1% (2 of 221) of sites surveyed. A novel environmental DNA (eDNA) assay was designed and implemented with the goals of assessing the current distribution of N. meridionalis across south Texas, USA, and better understanding the conditions for positive eDNA detections. We conducted eDNA sampling and traditional surveys at 80 sites throughout south Texas. Notophthalmus meridionalis was detected at 12 localities in total: four localities using eDNA surveys, four localities using traditional methods, and four localities with both methodologies. eDNA detections were obtained from five counties, including one where N. meridionalis has never been reported and another where N. meridionalis has not been observed since the 1930s. eDNA detections were obtained in all four seasons, generally following moderate to heavy rainfall events. Our results support the increased use of eDNA surveys to detect rare and cryptic amphibians and to better understand the current dis-tribution of this imperiled species.
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