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Environmental DNA analysis reveals the distribution pattern of a Himalayan hill stream fish

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Abstract

Assessment of distribution pattern of species with small populations is a prerequisite for conservation efforts. In our investigation, we evaluated the use of environmental DNA (eDNA) in assessing the presence and distribution pattern of a vulnerable fish species in Pranmati hill stream, a tributary of Pinder river in Chamoli, Uttarakhand. Fish specimens caught at one of the sites were classified as Schizothorax richardsonii after morphometric and meristic analysis. DNA isolated from these individuals was subjected to PCR for barcoding. DNA barcode confirmed that the sampled individuals belonged to S. richardsonii. We developed a real-time quantitative polymerase chain reaction (qPCR) assay to target 112 bp sequence of S. richardsonii COI gene. The primers on in silico analysis showed specificity for COI gene of Schizothorax spp. qPCR was employed to quantify the Schizothorax spp. DNA in eDNA samples collected from the four sampling sites on the Pranmati stream. Schizothorax spp. DNA was found in three out of four sites. Detection of Schizothorax spp. DNA at sites where fish specimens were neither visible nor caught, reinforces the importance of use of eDNA in sampling for rare and endangered species. This study demonstrates the efficacy of eDNA detection method for determining the distribution pattern of thinly populated fish species and can be employed to detect their presence at sites where it is difficult to locate or catch them, and can be made use of, while devising conservation strategies.

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Data availability

The data generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We acknowledge Dr. Vimal Singh, Associate Professor, Department of Geology, University of Delhi, for guidance in the field work and for providing the map of Pranmati basin. We also thank the two anonymous reviewers who greatly helped to improve the manuscript.

Funding

The work is supported by Institute of Eminence (IoE), University of Delhi (Research grant IoE/FRP/LS/2020/27 dated: 31.12.2020), and Ministry of Earth Science (MoES) (Research grant MoES/P.O.(Geo)/95/2017 dated: 21.06.2021). Rishikesh Krishan Laxmi (RKL) greatly acknowledges the Department of Zoology, University of Delhi for providing the infrastructural facilities and Council of Scientific and Industrial Research (CSIR) for providing the fellowship.

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Contributions

Designed the experiment: NS RKL, field work and development of lab protocol: NS RKL, performed the experiment and data analysis: RKL VSR NS, writing, reviewing, and editing: RKL VSR NS.

Corresponding author

Correspondence to Varunendra Singh Rawat.

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Ethics approval

The fish were sampled and treated according to the procedures established by Institutional Animal Ethics Committee (IAEC) at University of Delhi under the Committee for the purpose of Control and Supervision of Experiments for Animals (CPCSEA) (file no. DU/ZOOL/IAEC-A/01/2019).

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The authors declare no competing interests.

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Laxmi, R.K., Sehgal, N. & Rawat, V.S. Environmental DNA analysis reveals the distribution pattern of a Himalayan hill stream fish. Environ Biol Fish 105, 1575–1587 (2022). https://doi.org/10.1007/s10641-022-01350-5

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  • DOI: https://doi.org/10.1007/s10641-022-01350-5

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