Abstract
Environmental DNA (eDNA) analysis is a promising tool for the sensitive and effective monitoring of species distribution and abundance. Traditional eDNA analysis has targeted mitochondrial DNA (mtDNA) fragments due to their abundance in cells; however, the quantification may vary depending on cell type and physiology. Conversely, some recent eDNA studies have targeted multi-copy nuclear DNA (nuDNA) fragments, such as ribosomal RNA genes, in water, and reported a higher detectability and more rapid degradation than mitochondrial eDNA (mt-eDNA). These properties suggest that nuclear eDNA (nu-eDNA) may be useful for the accurate estimation of species abundance relative to mt-eDNA, but which remains unclear. In this study, we compiled previous studies and re-analyzed the relationships between mt- and nu-eDNA concentration and species abundance by comparing the R2 values of the linear regression. We then performed an aquarium experiment using zebrafish (Danio rerio) to compare the relationships across genetic regions, including single-copy nuDNA. We found more accurate relationships between multi-copy nu-eDNA and species abundance than mt-eDNA in these datasets, although the difference was not significant upon weighted-averaging the R2 values. Moreover, we compared the decay rate constants of zebrafish eDNA across genetic regions and found that multi-copy nu-eDNA degraded faster than mt-eDNA under pH 7, implying a quick turnover of multi-copy nu-eDNA in the field. Although further empirical studies of nu-eDNA applications are necessary to support our findings, this study provides the groundwork for improving the estimation accuracy of species abundance via eDNA analysis.
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Data availability
The raw data and corresponding R codes are to be uploaded to the Dryad Digital Repository upon acceptance.
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Acknowledgements
We thank Drs. Toshifumi Minamoto (Kobe University) and Teruhiko Takahara (Shimane University) for providing the raw data of eDNA quantification and species abundance in Minamoto et al. (2017). We also thank Crimson Interactive Japan Co., Ltd. (www.enago.jp) for English proofreading. We further thank the two anonymous reviewers and an editor who provided thoughtful advice to improve the manuscript.
Funding
This work was supported by the Grant-in-Aid for JSPS Research Fellows (Grant Numbers JP22J00439), the Environment Research and Technology Development Fund from the Ministry of the Environment, Japan (Grant Number JPMEERF20204004), the Grant-in-Aid for Scientific Research of JSPS KAKENHI (Grant Number JP20H03326), and partly by the Fund for the Promotion of Joint International Research of JSPS KAKENHI (Grant Number JP19KK0189).
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T.S.J. and H.Y. conceived the study. T.S.J. and K.T. performed aquarium experiments. T.S.J. compiled the datasets in previous studies, analyzed the data, and wrote the first draft of the manuscript. All authors edited and provided feedback on the manuscript.
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Jo, T.S., Tsuri, K. & Yamanaka, H. Can nuclear aquatic environmental DNA be a genetic marker for the accurate estimation of species abundance?. Sci Nat 109, 38 (2022). https://doi.org/10.1007/s00114-022-01808-7
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DOI: https://doi.org/10.1007/s00114-022-01808-7