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Oceanographic conditions associated with white shark (Carcharodon carcharias) habitat use along eastern Australia

Authors: Lee, KA; Butcher, PA; Harcourt, RG; Patterson, TA; Peddemors, VM; Roughan, M; Harasti, D; +2 Authors

Oceanographic conditions associated with white shark (Carcharodon carcharias) habitat use along eastern Australia

Abstract

Management of species with wide-ranging migrations is a complex issue, made more challenging when the species is both protected and poses a risk to humans. Understanding the oceanic conditions associated with shark habitat use can help develop mitigation strategies or warning systems that meet both conservation and human safety objectives. Using satellite tracks from 77 juvenile and sub-adult white sharks tagged over 10 yr, we modelled individual movement patterns using hidden Markov models and applied generalised additive (mixed) models to explore correlations between movement patterns (presence-absence, habitat selection and behavioural state) and oceanographic and bathymetric variables. White sharks used the whole of the continental shelf, down to depths of 350 m on the continental slope. Sharks were present over a wide range of sea surface temperatures (SSTs; 10-27°C), with the highest probability of occurring at ~20°C. However, the number of average daily tag positions was greatest when SST was between 14 and 18°C, and sharks were more likely to exhibit area-restricted movement when SST was between ~19 and 23°C. Sharks were more likely to be present and selected habitats in productive areas with moderate to high surface chl a concentrations as well as thermal and productivity fronts. Although mesoscale eddies did not influence the likelihood of individuals being present in an area, there was a higher density of sharks in cold-core eddies compared to warm-core eddies. This study indicates that white shark presence and dispersal may be linked, perhaps via prey distribution, to oceanic conditions, potentially assisting development of suitable shark bite mitigation strategies.

Country
Australia
Keywords

570, anzsrc-for: 0405 Oceanography, 15 Life on Land, 41 Environmental Sciences, anzsrc-for: 0602 Ecology, anzsrc-for: 0608 Zoology, anzsrc-for: 3109 Zoology, anzsrc-for: 41 Environmental Sciences, anzsrc-for: 4101 Climate Change Impacts and Adaptation, anzsrc-for: 3103 Ecology, 4101 Climate Change Impacts and Adaptation, anzsrc-for: 4102 Ecological applications, anzsrc-for: 31 Biological Sciences, 31 Biological Sciences

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
29
Top 10%
Top 10%
Top 10%
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bronze