0539258 - BC 2021 RIV US eng J - Journal Article
Šmejkal, Marek - Bartoň, Daniel - Děd, Vilém - Souza, Allan T. - Blabolil, Petr - Vejřík, Lukáš - Sajdlová, Zuzana - Říha, Milan - Kubečka, Jan
Negative feedback concept in tagging: Ghost tags imperil the long-term monitoring of fishes.
PLoS ONE. Roč. 15, č. 3 (2020), s. 1-11, č. článku e0229350. ISSN 1932-6203. E-ISSN 1932-6203
R&D Projects: GA MZe(CZ) QK1920326; GA MZe(CZ) QK1920011; GA TA ČR(CZ) TJ02000012; GA MŠMT(CZ) EF16_025/0007417
Institutional support: RVO:60077344
Keywords : integrated transponder tags * pit-tagged fish * detection efficiency * juvenile salmonids * retention rates * tracking * performance
OECD category: Marine biology, freshwater biology, limnology
Impact factor: 3.240, year: 2020
Method of publishing: Open access
https://doi.org/10.1371/journal.pone.0229350

Wildlife monitoring using passive telemetry has become a robust method for investigating animal migration. With increased use, this method progressively pollutes the environment with technological waste represented by so called ghost tags (PIT tags ending in the environment due to reproductive expulsions, shedding or animal mortality). However, their presence in the environment may lead to failed detections of living individuals. We used tagging data from studies of the asp Leuciscus aspius and the bleak Alburnus alburnus collected from 2014 to 2018 and located ghost tag positions on the monitored spawning site using portable backpack reader for their detection. We modelled virtual river-wide flat-bed antennas (widths 0.2, 0.4, 0.6 and 0.8 m) representing monitoring effort and estimated the probability of the presence of ghost tags within the antenna field. Of 3724 PIT tags used in the study, we detected on the spawning ground 173 ghost tags originating from long-term monitoring. The ghost tags accumulated in the environment in time, suggesting insufficient degradation rate or shift downstream from the research site. Number of ghost tags present on the spawning ground led to high probability of disabled readings of tagged fish passing through the antenna electro-magnetic field. We demonstrate how accumulated ghost tags may cause detection failures for focal species and incomplete data acquisition. We infer that intensive long-term monitoring using PIT tag technology may encumber future data acquisition or entail additional costs for clean-up.
Permanent Link: http://hdl.handle.net/11104/0316928