Monitoring Glass Eels Migration Barriers

Alongside eDNA sampling, refuge traps were placed near the tidal limits downstream of potential barriers to upstream migration in key freshwater catchments (those with freshwater flows reaching the sea). These traps were made up from 2× domestic mop heads (Pop Life, Paphos), tied together and secured in‐stream. Refuge traps were checked regularly (every 2 to 4 days), lifted from the watercourse and emptied into a bucket to check for the presence of glass eels. These were deployed in key catchments and monitored from mid‐March to mid‐April 2019, and throughout January and February 2020.

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Griffiths N.P., Wright R.M., Hänfling B., Bolland J.D., Drakou K., Sellers G.S., Zogaris S., Tziortzis I., Dörflinger G, & Vasquez M.I. (2023). Integrating environmental DNA monitoring to inform eel (Anguilla anguilla) status in freshwaters at their easternmost range—A case study in Cyprus. Ecology and Evolution, 13(2), e9800.

Publication 2023

Edna Eels Heads Mop 2

Corresponding Organization :

Other organizations : University of Hull, University of the Highlands and Islands, Environment Agency, Cyprus University of Technology, Hellenic Centre for Marine Research, Ministry of Agriculture, Natural Resources and Environment

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Variable analysis

independent variables

Placement of refuge traps near the tidal limits downstream of potential barriers to upstream migration in key freshwater catchments

dependent variables

Presence of glass eels in the refuge traps

control variables

Frequency of checking the refuge traps (every 2 to 4 days)
Timing of the study (mid-March to mid-April 2019, and throughout January and February 2020)

controls

No positive or negative controls were explicitly mentioned in the input protocol.

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