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<p>Environmental DNA (eDNA) has emerged as a powerful tool for detecting elusive and threatened species, particularly where conventional surveys provide limited or inconclusive evidence. More recently, CRISPR-Cas–based diagnostics have been introduced as a new class of molecular tools for eDNA detection, but their application in ecological monitoring and conservation remains limited. In this study, a CRISPR-Cas12a–based eDNA assay was applied to detect the Critically Endangered big-headed turtle (<i>Platysternon megacephalum</i>) in streams of northern Thailand and to evaluate its role in supporting community-based conservation (CBC). The assay demonstrated high analytical sensitivity, with a detection limit of 3.0 copies per reaction, and very low false-positive rates at both the field sampling stage (θ₁₀ = 0.010) and laboratory stage (p₁₀ = 0.099). Pre-establishment surveys conducted before the implementation of community-agreed protected zones, which included local prohibitions on turtle harvesting and restrictions on habitat-disturbing activities, yielded positive eDNA detections at nine sites, whereas direct field observations confirmed the species at four locations. Following the establishment of community-agreed protected zones, post-establishment sampling detected eDNA at 13 sites, reflecting broader spatial occurrence or detectability rather than inferred population recovery. Hierarchical Bayesian analysis indicated high reliability when multiple technical replicates were positive, while low numbers of positives warranted cautious interpretation. Importantly, the presentation of eDNA evidence played a critical role in addressing local scepticism and facilitated the establishment of protected stream sections through CBC processes. Overall, this study demonstrates that CRISPR-Cas12a eDNA represents a sensitive and reliable emerging qualitative monitoring tool and illustrates how novel molecular evidence can directly support community engagement and conservation decision-making for cryptic freshwater turtles.</p>

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eDNA evidence sparks local action for saving endangered turtles

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • Maslin Osathanunkul

摘要

Environmental DNA (eDNA) has emerged as a powerful tool for detecting elusive and threatened species, particularly where conventional surveys provide limited or inconclusive evidence. More recently, CRISPR-Cas–based diagnostics have been introduced as a new class of molecular tools for eDNA detection, but their application in ecological monitoring and conservation remains limited. In this study, a CRISPR-Cas12a–based eDNA assay was applied to detect the Critically Endangered big-headed turtle (Platysternon megacephalum) in streams of northern Thailand and to evaluate its role in supporting community-based conservation (CBC). The assay demonstrated high analytical sensitivity, with a detection limit of 3.0 copies per reaction, and very low false-positive rates at both the field sampling stage (θ₁₀ = 0.010) and laboratory stage (p₁₀ = 0.099). Pre-establishment surveys conducted before the implementation of community-agreed protected zones, which included local prohibitions on turtle harvesting and restrictions on habitat-disturbing activities, yielded positive eDNA detections at nine sites, whereas direct field observations confirmed the species at four locations. Following the establishment of community-agreed protected zones, post-establishment sampling detected eDNA at 13 sites, reflecting broader spatial occurrence or detectability rather than inferred population recovery. Hierarchical Bayesian analysis indicated high reliability when multiple technical replicates were positive, while low numbers of positives warranted cautious interpretation. Importantly, the presentation of eDNA evidence played a critical role in addressing local scepticism and facilitated the establishment of protected stream sections through CBC processes. Overall, this study demonstrates that CRISPR-Cas12a eDNA represents a sensitive and reliable emerging qualitative monitoring tool and illustrates how novel molecular evidence can directly support community engagement and conservation decision-making for cryptic freshwater turtles.