Dynamic use of coastal areas by bull sharks and the conciliation of conservation and management of negative human–wildlife interactions

Type Article
Date 2021-10
Language English
Author(s) Mourier JohannORCID3, Soria MarcORCID2, Blaison AntoninORCID3, Simier MoniqueORCID2, Certain GregoireORCID1, Demichelis Angélique3, Hattab TarekORCID1
Affiliation(s) 1 : MARBEC ,Univ Montpellier, CNRS, IFREMER, IRD Sète, France
2 : MARBEC, Univ Montpellier, CNRS, IFREMER, IRD Sète ,France
3 : MARBEC,Univ Montpellier, CNRS, IFREMER, IRD Sète, France
Source Aquatic Conservation-marine And Freshwater Ecosystems (1052-7613) (Wiley), 2021-10 , Vol. 31 , N. 10 , P. 2926-2937
DOI 10.1002/aqc.3674
Keyword(s) acoustic telemetry, Carcharhinus leucas, Indian Ocean, network analysis, Reunion Island, shark bite management, shark risk
Abstract

Knowledge about spatial and temporal variability in the distribution and abundance of predators is necessary to adapt measures to mitigate human–wildlife interactions.

Acoustic telemetry and network analyses were used to investigate the spatial ecology of bull sharks, the species responsible for most shark bites in Reunion Island, one of the world's shark bite hotspots.

The west coast of the island was not used uniformly by every individual, with size predicting the movements of sharks along the coast.

Node-based metrics – closeness, node strength, and cumulated continuous residency times – derived from up to 181 monthly movement networks from 20 individuals, revealed that smaller sharks (<250 cm total length) primarily used the south-west coast while larger individuals spent most of their time in the northern region with regular visits to multiple areas along the coast.

This study provides essential knowledge on bull shark behaviour and central areas used at different periods of the year, which correlates well with the dynamics of observed shark bites. Our approach provides a non-invasive alternative to help predicting and anticipating human–shark conflicts and avoid shark culling programmes detrimental to the conservation of large predators such as sharks.

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Mourier Johann, Soria Marc, Blaison Antonin, Simier Monique, Certain Gregoire, Demichelis Angélique, Hattab Tarek (2021). Dynamic use of coastal areas by bull sharks and the conciliation of conservation and management of negative human–wildlife interactions. Aquatic Conservation-marine And Freshwater Ecosystems, 31(10), 2926-2937. Publisher's official version : https://doi.org/10.1002/aqc.3674 , Open Access version : https://archimer.ifremer.fr/doc/00706/81765/