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Published VersionCC BY-NC V4.0, Open Access
Journal article
A current affair: entanglement of humpback whales in coastal shark-control nets
Remote Sensing in Ecology and Conservation, Vol.6(2), pp.119-128
2020
Abstract
Shark-control nets pose an entanglement risk to East Australian humpback whales during their annual northward and southward migrations between the Southern Ocean and the Coral Sea. Rates of whale entanglement exhibit seasonal and interannual variation, suggesting that an understanding of the influence of variability in the broad-scale physical environment along the migratory route would be useful in assessing risk of entanglement. This study provides a quantitative spatio-temporal analysis of the probability of whale entanglement in shark-control nets relative to the position and characteristics of the East Australian Current (EAC), the dominant oceanographic feature of the region. We use satellite-derived sea-surface temperature, and outputs from a data-assimilating ocean model, to develop multivariate, data-driven algorithms for detecting the edge of the EAC using Principal Components Analysis. We use outputs from these algorithms to model the likelihood of humpback entanglements in South-east Queensland. We find that the likelihood of entanglement increases when the EAC edge is locally less structured and closer to shore in the vicinity of the corresponding net, or when the EAC is well resolved over the entire study domain. Our results suggest that migrating humpbacks use the gradient in physical characteristics that marks the EAC inner edge as a navigational aid. Thus, when the EAC inner edge encroaches on the coast, the whales' migration range is compressed into nearshore waters, increasing the risk of entanglement. Our findings can help predict periods of elevated entanglement risk, which could underpin a more data-driven approach to the management of shark-control programs, and other activities that involve static fishing gear.
Details
- Title
- A current affair: entanglement of humpback whales in coastal shark-control nets
- Authors
- Jessica Bolin (Corresponding Author) - University of the Sunshine CoastDavid S Schoeman (Author) - University of the Sunshine CoastCarmen Piza Roca (Author) - University of the Sunshine CoastKylie L Scales (Author) - University of the Sunshine Coast
- Publication details
- Remote Sensing in Ecology and Conservation, Vol.6(2), pp.119-128
- Publisher
- John Wiley & Sons Ltd.
- Date published
- 2020
- DOI
- 10.1002/rse2.133
- ISSN
- 2056-3485
- Copyright note
- Copyright © 2019 The Authors. Remote Sensing in Ecology and Conservation published by John Wiley & Sons Ltd on behalf of Zoological Society of London. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes
- Organisation Unit
- School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99450715102621
- Output Type
- Journal article
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- Ecology
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