Percorrer por autor "Verhelst, Pieterjan"
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- Open protocols, the new standard for acoustic tracking: results from interoperability and performance tests in European watersPublication . Aspillaga, Eneko; Bruneel, Stijn; Alós, Josep; Verhelst, Pieterjan; Abecasis, David; Aarestrup, Kim; Birnie-Gauvin, Kim; Afonso, Pedro; Palmer, Miquel; Reubens, JanBackground The lack of compatibility between acoustic telemetry equipment from different manufacturers has been a major obstacle to consolidating large collaborative tracking networks. Undisclosed encrypted signal cod ing protocols limit the use of acoustic telemetry to study animal movements over large spatial scales, reduce com petition between manufacturers, and stifle innovation. The European Tracking Network, in collaboration with several acoustic telemetry manufacturers, has worked to develop new transparent protocols for acoustic tracking. The results are energy-efficient transmission protocols accessible to all researchers and manufacturers. Today, the Open Protocols (OP) are already available to manufacturers and developers, and the first transmitters and receivers to implement them are already in the water. Results The main objective of this study was to confirm the compatibility between devices from different manufac turers using OP, characterise the acoustic range of each transmitter–receiver manufacturer combination, compare the detection efficiency to the standard protocols used at present (R64K and encrypted protocols), and assess its robustness against spurious detections. An international collaborative effort was made to conduct acoustic range tests in four main aquatic habitats: a river, a coastal lagoon, a coastal habitat, and the open sea. Receivers and trans mitters from different manufacturers were deployed at increasing distances from each other using the same experi mental design at each location. The decay of detection probability with distance was modelled for each transmit ter–receiver manufacturer combination by applying logistic regression using a Bayesian approach. Furthermore, to thoroughly assess performance differences in an applied research context, we conducted a direct field comparison between groups of smolts tagged with OP and R64K tags, tracking their migration to the sea. Conclusions Our results confirm full compatibility between the tested devices, with negligible differences in the measured acoustic ranges between OP manufacturers and when compared to encrypted protocols. The OP was also robust against spurious detections, and the field comparison between OP and R64K showed equal perfor mance. We hope these novel insights will encourage international research groups to promote OP-based studies to ensure compatibility and maximise the benefits of acoustic telemetry networks.
- Revealing chronotypes across aquatic species using acoustic telemetryPublication . Martorell‐Barceló, Martina; Abecasis, David; Akaarir, Mourad; Alonso‐Fernández, Alexandre; Arlinghaus, Robert; Aspillaga, Eneko; Barcelo‐Serra, Margarida; Brevé, Niels W. P.; Davidsen, Jan G.; Gamundí, Antoni; Grau, Amalia; Hereu, Bernat; Jarić, Ivan; Kapusta, Andrzej; Lowerre‐Barbieri, Sue; Monk, Christopher T.; Nickel, Anja K.; Nicolau, María C.; Ólafsdóttir, Guðbjörg Á.; Olsen. Esben M.; Pickholtz, Renanel; Prchalová, Marie; Reubens, Jan; Říha, Milan; Knaap, Inge van der; Verhelst, Pieterjan; Villegas‐Ríos, David; Alós, JosepAcoustic telemetry offers valuable opportunities to investigate individual variability in circadian-related and other behaviours and how environmental cues shape these patterns in wild fish populations. However, this potential has not yet been fully exploited. We conducted a meta-analysis on 44 datasets from 34 distinct marine and freshwater species and different types of data (acoustic detections, depth, acceleration and positioning). Our aim was to explore the potential of acoustic telemetry in identifying chronotypes as consistent among-individual differences in circadian-related behaviours. First, we applied hidden semi-Markov models to classify individual time series into active and rest states. Subsequently, we computed two classical circadian-related behavioural traits: awakening time (as the activity onset) and rest onset (as the activity offset). Subsequently, we identified distinct phenotypes by decomposing behavioural variation into within- and among-individual components based on repeatability scores. We found evidence of distinct chronotypes in 17 species, with average repeatability scores of 0.52 for awakening time and 0.43 for rest onset, revealing that chronotypes are common in aquatic species. Our findings highlight that both the data type, particularly acceleration sensors, and the number of detections are effective tools for exploring chronotypes. Our study proposes a novel approach to characterising daily activity patterns in aquatic species, predominantly in fishes, and provides guidelines for investigating chronotypes across diverse taxa. We emphasise the promise of biotelemetry and advanced statistical models for improving our understanding of the behaviour of aquatic species and highlight the value of synthesising across large data sets collected in networks of biotelemetryprojects.