Spatio‐temporal monitoring of lake fish spawning activity using environmental DNA metabarcoding

Di Muri, Cristina; Lawson Handley, Lori; Bean, Colin W.; Benucci, Marco; Harper, Lynsey R.; James, Ben; Li, Jianlong; Winfield, Ian J. ORCID:; Hänfling, Bernd. 2023 Spatio‐temporal monitoring of lake fish spawning activity using environmental DNA metabarcoding [in special issue: Beyond species detection] Environmental DNA, 5 (5). 849-860.

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Determining the timing and location of fish reproductive events is crucial for the implementation of correct management and conservation schemes. Conventional methods used to monitor these events are often unable to assess the spawning activity directly or can be invasive and therefore problematic. This is especially the case when threatened fish populations are the study subject, such as the Arctic charr (Salvelinus alpinus L.) populations in Windermere (Cumbria, UK). Arctic charr populations have been studied in this lake since the 1940s, and the locations and characteristics of spawning grounds have been described in detail using techniques such as hydroacoustics, as well as physical and visual surveys of the lake bottom. Here, in conjunction with established netting surveys, we added an environmental DNA (eDNA) metabarcoding approach to assess the spatial distribution of Arctic charr in the lake throughout the year to test whether this tool could allow us to identify spawning locations and activity. Sampling was carried out between October 2017 and July 2018 at three locations in the lake, covering putative and known spawning sites. eDNA metabarcoding provided accurate spatial and temporal characterization of Arctic charr spawning events. Peaks of Arctic charr relative read counts from eDNA metabarcoding were observed during the spawning season and at specific locations of both putative and known spawning sites. Net catches of mature Arctic charr individuals confirmed the association between the Arctic charr spawning activity and the peaks of eDNA metabarcoding relative read counts. This study demonstrates the ability of eDNA metabarcoding to effectively and efficiently characterize the spatial and temporal nature of fish spawning in lentic systems.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Water Resources (Science Area 2017-)
ISSN: 2637-4943
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: Arctic charr, breeding grounds, conservation, freshwaters, lentic systems, Salvelinus alpinus
NORA Subject Terms: Ecology and Environment
Date made live: 24 Jan 2024 10:51 +0 (UTC)

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