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Restricted movements and mangrove dependency of the nervous shark Carcharhinus cautus in nearshore coastal waters

Citation

Escalle, L and Speed, CW and Meekan, MG and White, WT and Babcock, RC and Pillans, RD and Huveneers, C, Restricted movements and mangrove dependency of the nervous shark Carcharhinus cautus in nearshore coastal waters, Journal of Fish Biology, 87, (2) pp. 323-341. ISSN 0022-1112 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 The Fisheries Society of the British Isles

DOI: doi:10.1111/jfb.12724

Abstract

This study used a network of acoustic receivers deployed around a no-take zone in Mangrove Bay, within the Ningaloo Reef Marine Park in Western Australia, to study residency and habitat preference of a small coastal shark, the nervous shark Carcharhinus cautus. Twelve C. cautus were tagged with acoustic tags and monitored for up to 579days. Based on individuals detected within the receiver array for at least 2months, C. cautus had small core (50% kernel utilization distribution, KUD) and home ranges (95% KUD) of 0.66 and 3.64km2, respectively, and showed a strong habitat preference for mangroves, which are only found in the no-take zone. This resulted in C. cautus spending most of their detected time within the no-take zone boundaries (mean=81.5%), showing that such a protected area could be beneficial to protect this species from extensive fishing pressure and local depletion, where required. Not all C. cautus remained within the acoustic array, however, suggesting that individual variations occur and that not all individuals would benefit from such protection. This study provides important information about the habitat, residency and movements of C. cautus that can be used for management and conservation. The strong affinity and residency of C. cautus within a mangrove-fringing coastline, emphasizes the importance of mangrove habitat to the species and suggests that such preferences can be used to design appropriate no-take zones for this species or others with similar habitat preferences.

Item Details

Item Type:Refereed Article
Keywords:AATAMS, acoustic telemetry,habitat,marine protected area, residency
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal Behaviour
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:White, WT (Dr William White)
ID Code:118910
Year Published:2015
Web of Science® Times Cited:7
Deposited By:Zoology
Deposited On:2017-07-21
Last Modified:2017-10-23
Downloads:0

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