Assessing the overlap between the diet of a coastal shark and the surrounding prey communities in a sub-tropical embayment

Gutteridge, A. N., Bennett, M. B., Huveneers, C. and Tibbetts, I. R. (2011) Assessing the overlap between the diet of a coastal shark and the surrounding prey communities in a sub-tropical embayment. Journal of Fish Biology, 78 5: 1405-1422. doi:10.1111/j.1095-8649.2011.02945.x


Author Gutteridge, A. N.
Bennett, M. B.
Huveneers, C.
Tibbetts, I. R.
Title Assessing the overlap between the diet of a coastal shark and the surrounding prey communities in a sub-tropical embayment
Journal name Journal of Fish Biology   Check publisher's open access policy
ISSN 0022-1112
1095-8649
Publication date 2011-05-01
Sub-type Article (original research)
DOI 10.1111/j.1095-8649.2011.02945.x
Volume 78
Issue 5
Start page 1405
End page 1422
Total pages 18
Place of publication Oxford, U.K.
Publisher Wiley-Blackwell Publishing
Collection year 2012
Language eng
Formatted abstract
An elasmobranch survey of sub-tropical Hervey Bay, Australia, captured the slit-eye shark Loxodon macrorhinus at only one of three sites sampled. The dietary composition of this small shark species was compared to the prey communities within Hervey Bay to test whether prey availability was driving this observation. Dietary analysis of prey groups revealed that teleosts dominated the diet, per cent index of relative importance, % IRI (79.5%) and per cent geometric index of importance, % GII (52.7%), with shrimp-like invertebrates and cephalopods identified as the most important invertebrate prey groups. Baited remote underwater video (BRUV) used to sample prey communities at each site, demonstrated a highly diverse and significantly different community composition among the sites. There was no significant overlap between the diet of L. macrorhinus and any of the prey communities detected by BRUVs according to one-way analysis of similarities and the simplified Morisita index. Habitat electivity analysis revealed affinity of L. macrorhinus for the site with the highest water clarity (Secchi disc depth), opposing that of three other shark species. Overall, the results suggest that the distribution of L. macrorhinus is not driven by prey availability but other factors such as water clarity, predator avoidance or a reduction in interspecies competition.
Keyword BRUV
Carcharhinidae
Habitat
Loxodon macrorhinus
Turbidity
Hervey-bay
Reproductive-biology
Humpback whales
Megaptera-novaeangliae
Shallow habitats
Fish assemblages
National-park
Australia
Seagrass
Queensland
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
School of Biomedical Sciences Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 14 times in Scopus Article | Citations
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Created: Sat, 03 Sep 2011, 02:42:24 EST by Gail Walter on behalf of School of Biological Sciences