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

Type Article
Date 2019-02
Language English
Author(s) Tixier Paul1, Burch Paul2, Richard Gaetan1, 3, Olsson Karin4, 5, Welsford Dirk6, Lea Mary-Anne7, Hindell Mark A.7, Guinet Christophe3, Janc Anais3, Gasco Nicolas8, Duhamel Guy8, Villanueva Ching-MariaORCID9, Suberg Lavinia9, Arangio Rhys10, Söffker Marta4, Arnould John P.Y.1
Affiliation(s) 1 : School of Life and Environmental Sciences (Burwood campus), Deakin University, Geelong, Victoria, Australia
2 : Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Hobart, Tasmania, Australia
3 : Centre d’Etudes Biologiques de Chizé (CEBC), UMR 7372 Université de la Rochelle-CNRS, Villiers-en-Bois, France
4 : Centre for Environment, Fisheries & Aquaculture Science, Lowestoft, United Kingdom
5 : Department of Zoology, Tel Aviv University and Intra-University Institute, Eilat, Israel
6 : Department of the Environment, Australian Antarctic Division, Kingston, Tasmania, Australia
7 : Ecology and Biodiversity Centre, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia
8 : Département Adaptations du vivant, UMR BOREA, Museum National d’Histoire Naturelle, Paris, France
9 : Laboratoire de Biologie Halieutique (STH-LBH), IFREMER, ZI de la Pointe du Diable, BP 70, 29280, Plouzané, France
10 : Coalition of Legal Toothfish Operators (COLTO), Perth, Australia
Source Scientific Reports (2045-2322) (Nature), 2019-02 , Vol. 9 , N. 1904 , P. 11p.
DOI 10.1038/s41598-018-36389-x
WOS© Times Cited 3
Abstract

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.

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Publisher's official version 11 2 MB Open access
Table S1 3 288 KB Open access
Table S2 5 166 KB Open access
Table S3 2 45 KB Open access
Data S1 103 679 KB Open access
Data S2 83 1 MB Open access
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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 Ching-Maria, Suberg Lavinia, Arangio Rhys, Söffker Marta, Arnould John P.Y. (2019). Commercial fishing patterns influence odontocete whale-longline interactions in the Southern Ocean. Scientific Reports, 9(1904), 11p. Publisher's official version : https://doi.org/10.1038/s41598-018-36389-x , Open Access version : https://archimer.ifremer.fr/doc/00481/59242/