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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Scarring patterns and relative mortality rates of Indian Ocean whale sharks
Journal of Fish Biology, Volume 72, No. 6, Year 2008
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Description
This study recorded the scarring rate and severity for whale sharks Rhincodon typus from three Indian Ocean aggregations (Australia, Seychelles and Mozambique), and examined whether scarring (mostly attributed to boat strikes and predator attacks) influences apparent survival rates using photo-identification libraries. Identifications were based on spot-and-stripe patterns that are unique to individual whale sharks. Scarring was most prevalent in the Seychelles aggregation (67% of individuals). Predator bites were the most frequent source of scarring (aside from minor nicks and abrasions) and 27% of individuals had scars consistent with predator attacks. A similar proportion of whale sharks had blunt trauma, laceration and amputation scars, the majority of which appeared to be caused by ship collisions. Predator bites were more common (44% of individuals) and scars from ship collisions were less common at Ningaloo Reef than at the other two locations (probability of among-site differences occurring randomly = 0.0007 based on a randomized multinomial contingency analysis). In all aggregations, scars occurred most often on the caudal fin, which may result from the fin being the body part closest to the surface when boats pass over, or they may provide a large target for predator attack. No evidence was found for an effect of scarring on apparent survival (φ; mean ± s.e.) for the Ningaloo (not scarred φ = 0.858 ± 0.033; scarred φ = 0.929 ± 0.033) or Seychelles populations (not scarred φ = 0.502 ± 0.060; scarred φ = 0.538 ± 0.070). The lower apparent survival of the Seychelles population may be attributed to a high number of transient whale sharks in this aggregation that might bias estimates. This study indicates that while scarring from natural predators and smaller vessels appears to be unrelated to whale shark survival, the effect of deaths related to ship strike need to be quantified to assist in future management of this species. © 2008 The Authors.
Authors & Co-Authors
Speed, Conrad W.
Australia, Townsville
Australian Institute of Marine Science
Australia, Darwin
Charles Darwin University, Institute of Advanced Studies
Meekan, Mark Gregory
Australia, Townsville
Australian Institute of Marine Science
Rowat, David R.L.
Seychelles
Marine Conservation Society
Pierce, Simon J.
Mozambique
Manta Ray and Whale Shark Research Centre
Marshall, Andrea Denise
Mozambique
Manta Ray and Whale Shark Research Centre
Bradshaw, Corey J.A.
Australia, Darwin
Charles Darwin University, Institute of Advanced Studies
Australia, Adelaide
The University of Adelaide
Australia, Adelaide
South Australian Research and Development Institute
Statistics
Citations: 101
Authors: 6
Affiliations: 6
Identifiers
Doi:
10.1111/j.1095-8649.2008.01810.x
ISSN:
00221112
e-ISSN:
10958649
Study Design
Cross Sectional Study
Study Locations
Mozambique
Seychelles