Read counts from environmental DNA (eDNA) metabarcoding reflect fish abundance and biomass in drained ponds.

Di Muri, C., Lawson Handley, L., Bean, C. W. , Li, J., Peirson, G., Sellers, G. S., Walsh, K., Watson, H. V., Winfield, I. J. and Hänfling, B. (2020) Read counts from environmental DNA (eDNA) metabarcoding reflect fish abundance and biomass in drained ponds. Metabarcoding and Metagenomics, 4, pp. 97-112. (doi: 10.3897/mbmg.4.56959)

Abstract

The sampling of environmental DNA (eDNA) coupled with cost-efficient and ever-advancing sequencing technology is propelling changes in biodiversity monitoring within aquatic ecosystems. Despite the increasing number of eDNA metabarcoding approaches, the ability to quantify species biomass and abundance in natural systems is still not fully understood. Previous studies have shown positive but sometimes weak correlations between abundance estimates from eDNA metabarcoding data and from conventional capture methods. As both methods have independent biases a lack of concordance is difficult to interpret. Here we tested whether read counts from eDNA metabarcoding provide accurate quantitative estimates of the absolute abundance of fish in holding ponds with known fish biomass and number of individuals. Environmental DNA samples were collected from two fishery ponds with high fish density and broad species diversity. In one pond, two different DNA capture strategies (on-site filtration with enclosed filters and three different preservation buffers versus lab filtration using open filters) were used to evaluate their performance in relation to fish community composition and biomass/abundance estimates. Fish species read counts were significantly correlated with both biomass and abundance, and this result, together with information on fish diversity, was repeatable when open or enclosed filters with different preservation buffers were used. This research demonstrates that eDNA metabarcoding provides accurate qualitative and quantitative information on fish communities in small ponds, and results are consistent between different methods of DNA capture. This method flexibility will be beneficial for future eDNA-based fish monitoring and their integration into fisheries management.

• Item Type: Articles
• Additional Information: This work was funded by the UK Environment Agency (collaborative agreement 171024).
• Keywords: Environmental DNA, eDNA , fish.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Bean, Professor Colin
• Authors: Di Muri, C., Lawson Handley, L., Bean, C. W., Li, J., Peirson, G., Sellers, G. S., Walsh, K., Watson, H. V., Winfield, I. J., and Hänfling, B.
• Subjects: Q Science > QH Natural history > QH426 Genetics; Q Science > QL Zoology
• College/School: College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
• Journal Name: Metabarcoding and Metagenomics
• Publisher: Pensoft Publishers
• ISSN: 2534-9708
• ISSN (Online): 2534-9708
• Copyright Holders: Copyright Cristina Di Muri et al
• First Published: First published in Metabarcoding and Metagenomics 4:97-112
• Publisher Policy: Reproduced under a Creative Commons license