Commercial fishing patterns influence odontocete whale-longline interactions in the Southern Ocean

Tixier, Paul, Burch, Paul, Richard, Gaetan, Olsson, Karin, Welsford, Dirk, Lea, Mary-Anne, Hindell, Mark A, Guinet, Christophe, Janc, Anais, Gasco, Nicolas, Duhamel, Guy, Villanueva, Maria Ching, Suberg, Lavinia, Arangio, Rhys, Söffker, Marta and Arnould, John PY 2019, Commercial fishing patterns influence odontocete whale-longline interactions in the Southern Ocean, Scientific reports, vol. 9, pp. 1-11, doi: 10.1038/s41598-018-36389-x.

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Title Commercial fishing patterns influence odontocete whale-longline interactions in the Southern Ocean
Author(s) Tixier, PaulORCID iD for Tixier, Paul
Burch, Paul
Richard, Gaetan
Olsson, Karin
Welsford, Dirk
Lea, Mary-Anne
Hindell, Mark A
Guinet, Christophe
Janc, Anais
Gasco, Nicolas
Duhamel, Guy
Villanueva, Maria Ching
Suberg, Lavinia
Arangio, Rhys
Söffker, Marta
Arnould, John PYORCID iD for Arnould, John PY
Journal name Scientific reports
Volume number 9
Article ID 1904
Start page 1
End page 11
Total pages 11
Publisher Nature Publishing Group
Place of publication London, Eng.
Publication date 2019-02-13
ISSN 2045-2322
Keyword(s) Behavioural ecology
Conservation biology
Ocean sciences
Science & Technology
Multidisciplinary Sciences
Summary The emergence of longline fishing around the world has been concomitant with an increase in depredation-interactions by odontocete whales (removal of fish caught on hooks), resulting in substantial socio-economic and ecological impacts. The extent, trends and underlying mechanisms driving these interactions remain poorly known. Using long-term (2003-2017) datasets from seven major Patagonian toothfish (Dissostichus eleginoides) longline fisheries, this study assessed the levels and inter-annual trends of sperm whale (Physeter macrocephalus) and/or killer whale (Orcinus orca) interactions as proportions of fishing time (days) and fishing area (spatial cells). The role of fishing patterns in explaining between-fisheries variations of probabilities of odontocete interactions was investigated. While interaction levels remained globally stable since the early 2000s, they varied greatly between fisheries from 0 to >50% of the fishing days and area. Interaction probabilities were influenced by the seasonal concentration of fishing effort, size of fishing areas, density of vessels, their mobility and the depth at which they operated. The results suggest that between-fisheries variations of interaction probabilities are largely explained by the extent to which vessels provide whales with opportunities for interactions. Determining the natural distribution of whales will, therefore, allow fishers to implement better strategies of spatio-temporal avoidance of depredation.
Language eng
DOI 10.1038/s41598-018-36389-x
Field of Research 060201 Behavioural Ecology
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
050209 Natural Resource Management
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2019, The Author(s)
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