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Scarring patterns and relative mortality rates of Indian Ocean whale sharks

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dc.contributor Australian Institute Of Marine Science
dc.contributor Marine Conservat Soc
dc.contributor Inst Adv Studies
dc.contributor Manta Ray & Whale Shark Res Ctr
dc.contributor Sch Environm Res
dc.contributor Charles Darwin Univ
dc.contributor Australian Inst Marine Sci
dc.contributor Charles Darwin University
dc.contributor Australian Institute Of Marine Science (aims) en BRADSHAW, C. J. A. SPEED, C. W. MEEKAN, M. G. ROWAT, D. PIERCE, S. J. MARSHALL, A. D. 2017-03-21T01:19:13Z 2013-02-28T06:53:51Z 2017-03-21T01:19:13Z 2019-07-08T02:39:33Z 2013-02-28T06:53:51Z 2017-03-21T01:19:13Z 2013-02-28T06:53:51Z 2019-07-08T02:39:33Z 2008-04-01
dc.identifier 7666 en
dc.identifier.citation Speed CW, Meekan MG, Rowat D, Pierce S, Marshall A and Bradshaw CJA (2008) Scarring patterns and relative mortality rates of Indian Ocean whale sharks. Journal of Fish Biology. 72: 1488-1503. en
dc.identifier.issn 0022-1112
dc.description Link to abstract/full text - en
dc.description.abstract 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 (phi; mean +/- S.E.) for the Ningaloo (not scarred phi = 0.858 +/- 0.033; scarred phi = 0.929 +/- 0.033) or Seychelles populations (not scarred phi = 0.502 +/- 0.060; scarred phi= 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. (c) 2008 The Authors Journal compilation (c) 2008 The Fisheries Society of the British Isles.
dc.description.uri en
dc.language English
dc.language en en
dc.relation.ispartof Journal of Fish Biology - pages: 72: 1488-1503 en
dc.relation.ispartof Null
dc.subject Waters
dc.subject Rhincodon Typus
dc.subject Boat Strike
dc.subject Photo-identification
dc.subject Scarring
dc.subject Mark
dc.subject Fisheries
dc.subject Recapture
dc.subject Biology
dc.subject Rhincodon-typus
dc.subject Largest Fish
dc.subject Western-australia
dc.subject Population
dc.subject Marine & Freshwater Biology
dc.subject Ningaloo-reef
dc.subject Satellite Tracking
dc.subject Survival
dc.subject Survival Rates
dc.subject Movements
dc.title Scarring patterns and relative mortality rates of Indian Ocean whale sharks
dc.type journal article en
dc.identifier.doi 10.1111/j.1095-8649.2008.01810.x
dc.identifier.wos WOS:000254809200017

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