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Spatial and temporal movement patterns of a multi-species coastal reef shark aggregation

Citation

Speed, CW and Meekan, MG and Field, IC and McMahon, CR and Stevens, JD and McGregor, F and Huveneers, C and Berger, Y and Bradshaw, CJA, Spatial and temporal movement patterns of a multi-species coastal reef shark aggregation, Marine Ecology Progress Series, 429 pp. 261-275. ISSN 0171-8630 (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 Inter-Research

DOI: doi:10.3354/meps09080

Abstract

The quantification of spatial and temporal movement patterns of coral reef sharks is important to understand their role in reef communities and to aid the design of conservation strategies for this predatory guild. We observed 4 species of reef sharks aggregating in an inshore bay in the north of Western Australia for over 2 yr, using acoustic telemetry and visual censuses to examine how they partitioned this site in space and time. We fitted 58 sharks with acoustic transmitters: Carcharhinus melanopterus (36), C. amblyrhynchos (11), Negaprion acutidens (7) and Triaenodon obesus (4). Aggregations consisted primarily of C. melanopterus, although C. amblyrhynchos and N. acutidens were often present. We observed aggregations by visual census in summer (maximum of 44 sharks). Detections were highest during warmer months (Sep to Mar) for all species, although some individuals showed year-round residency. C. melanopterus, C. amblyrhynchos and N. acutidens had strong diel patterns of attendance at the aggregation site. Peak daily detections occurred from 13:00 to 14:00 h local time for C. melanopterus and C. amblyrhynchos; juvenile C. melanopterus and N. acutidens peaked at 05:00 and 10:00 h, respectively. There was considerable spatial overlap of core areas of use (50% kernel density estimates) at the northern end of the bay by all species; the southern end was used primarily by C. melanopterus and N. acutidens. Aggregations of C. melanopterus and C. amblyrhynchos consisted mainly of adult females, some of them pregnant. Courtship behaviour in C. melanopterus and T. obesus suggests that these aggregations are related to reproduction. All species displayed inter-annual site fidelity. The long-term presence of juvenile C. melanopterus and N. acutidens also suggests that this bay provides suitable conditions for younger age classes.

Item Details

Item Type:Refereed Article
Keywords:acoustic telemetry, diel patterns, habitat partitioning,habitat use, management, residency, site fidelity, visual census
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:McMahon, CR (Dr Clive McMahon)
ID Code:119014
Year Published:2011
Web of Science® Times Cited:45
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-07-25
Last Modified:2017-10-16
Downloads:5 View Download Statistics

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