Variable response to electric shark deterrents in bull sharks, Carcharhinus leucas
| Autor: | M. G. Hoarau, A. R. G. Gauthier, E. Hoarau, Charlie Huveneers, E. Chateauminois, S. Jaquemet, Sasha K. Whitmarsh, J. Gadenne |
|---|---|
| Přispěvatelé: | Centre Sécurité Requin, Ecologie marine tropicale dans les Océans Pacifique et Indien (ENTROPIE [Réunion]), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Institut de Recherche pour le Développement (IRD), Flinders University [Adelaide, Australia], This study was financially supported by the Centre Sécurité Requin, funded by the French government., Institut de Recherche pour le Développement (IRD)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
food.ingredient lcsh:Medicine Bull shark 010603 evolutionary biology 01 natural sciences Article shark Predatory behavior food Electricity New Caledonia Animals Bites and Stings 14. Life underwater lcsh:Science Leucas Multidisciplinary Behavior Animal biology 010604 marine biology & hydrobiology [SDV.BA]Life Sciences [q-bio]/Animal biology lcsh:R Animal behaviour biology.organism_classification Electric Stimulation Carcharias Carcharodon Fishery Predatory Behavior Carcharhinus Sharks lcsh:Q [SDE.BE]Environmental Sciences/Biodiversity and Ecology Ichthyology |
| Zdroj: | Scientific Reports (2045-2322) (Nature Research), 2020-10, Vol. 10, N. 1, P. 17869 (13p.) Scientific Reports, Vol 10, Iss 1, Pp 1-13 (2020) Scientific Reports Scientific Reports, Nature Publishing Group, 2020, 10, pp.17869. ⟨10.1038/s41598-020-74799-y⟩ Scientific Reports, 2020, 10, pp.17869. ⟨10.1038/s41598-020-74799-y⟩ |
| ISSN: | 2045-2322 |
| Popis: | Although relatively rare, human-shark interactions and sharks bites are increasing globally, which has led to the development of various mitigation measures. Electric shark deterrents (ESDs) have, so far, been the most effective personal deterrents, but have only been scientifically tested on one of the species most frequently responsible for shark bites, i.e. white shark (Carcharodon carcharias). We tested the effectiveness of five ESDs (E-Shark Force, NoShark, Rpela v2, Freedom + Surf, Freedom + Surf—Shortboard) on bull sharks, Carcharhinus leucas, over a period of 21 days in September 2019, in New Caledonia. Standardised bait was attached 30 cm below an experimental board that had an active ESD for up to 15 min, or until a bull shark touched the bait or the board. We compared the numbers of baits taken, numbers of passes and reactions around the board, as well as the distance between the sharks and the board among ESDs and against a control board with bait and no active ESD. The Freedom + Surf was the most effective ESD, reducing the amounts of baits taken by 42.3%, while the Rpela v2 and Freedom + Surf—Shortboard also significantly reduced the number of baits taken by 16.5% and 16.2% respectively. Mean distance between sharks and the bait was not affected by the ESDs, but the number of approaches and the proportion of reactions were both significantly higher when the Freedom + Surf was active compared to other ESDs. The effectiveness of all ESDs decreased over time, with the likelihood of the bait being taken increasing and the number of approaches and distance between sharks and the bait decreasing. Our findings show that the ability of ESDs to deter bull shark varies between products, with the Freedom + Surf resulting in the most behavioural changes, followed by the Rpela v2 and Freedom + Surf—Shortboard. However, none of the products tested completely stopped sharks from taking the bait. |
| Databáze: | OpenAIRE |
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