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Behavioural heterogeneity across killer whale social units in their response to feeding opportunities from fisheries.

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Title: Behavioural heterogeneity across killer whale social units in their response to feeding opportunities from fisheries.
Authors: Auguin, Erwan1,2 (AUTHOR) erwan.auguin@ird.fr, Guinet, Christophe2 (AUTHOR), Mourier, Johann1 (AUTHOR), Clua, Eric3,4 (AUTHOR), Gasco, Nicolas5 (AUTHOR), Tixier, Paul1 (AUTHOR)
Source: Ecology & Evolution (20457758). May2024, Vol. 14 Issue 5, p1-14. 14p.
Subject Terms: *Predatory aquatic animals, *Bycatches, *Fisheries, *Marine fishes, Societal reaction, Life history theory, Killer whale
Geographic Terms: Crozet Islands
Abstract: Intra‐population heterogeneity in the behavioural response of predators to changes in prey availability caused by human activities can have major evolutionary implications. Among these activities, fisheries, while extracting resources, also provide new feeding opportunities for marine top predators. However, heterogeneity in the extent to which individuals have responded to these opportunities within populations is poorly understood. Here, we used 18 years of photo‐identification data paired with statistical models to assess variation in the way killer whale social units within a subantarctic population (Crozet Islands) interact with fisheries to feed on fish caught on fishing gear (i.e., depredation behaviour). Our results indicate large heterogeneity in both the spatial and temporal extents of depredation across social units. While some frequently depredated on fishery catches over large areas, others sporadically did so and in small areas consistently over the years. These findings suggest that killer whale social units are exposed to varying levels of impacts of depredation, both negative (potential retaliation from fishers) and positive (food provisioning), on their life history traits, and may explain the contrasted demographic patterns observed within the declining population at Crozet but also potentially within the many other killer whale populations documented depredating on fisheries catches worldwide. [ABSTRACT FROM AUTHOR]
Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Behavioural heterogeneity across killer whale social units in their response to feeding opportunities from fisheries.
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  Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. May2024, Vol. 14 Issue 5, p1-14. 14p.
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  Data: *<searchLink fieldCode="DE" term="%22Predatory+aquatic+animals%22">Predatory aquatic animals</searchLink><br />*<searchLink fieldCode="DE" term="%22Bycatches%22">Bycatches</searchLink><br />*<searchLink fieldCode="DE" term="%22Fisheries%22">Fisheries</searchLink><br />*<searchLink fieldCode="DE" term="%22Marine+fishes%22">Marine fishes</searchLink><br /><searchLink fieldCode="DE" term="%22Societal+reaction%22">Societal reaction</searchLink><br /><searchLink fieldCode="DE" term="%22Life+history+theory%22">Life history theory</searchLink><br /><searchLink fieldCode="DE" term="%22Killer+whale%22">Killer whale</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Crozet+Islands%22">Crozet Islands</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Intra‐population heterogeneity in the behavioural response of predators to changes in prey availability caused by human activities can have major evolutionary implications. Among these activities, fisheries, while extracting resources, also provide new feeding opportunities for marine top predators. However, heterogeneity in the extent to which individuals have responded to these opportunities within populations is poorly understood. Here, we used 18 years of photo‐identification data paired with statistical models to assess variation in the way killer whale social units within a subantarctic population (Crozet Islands) interact with fisheries to feed on fish caught on fishing gear (i.e., depredation behaviour). Our results indicate large heterogeneity in both the spatial and temporal extents of depredation across social units. While some frequently depredated on fishery catches over large areas, others sporadically did so and in small areas consistently over the years. These findings suggest that killer whale social units are exposed to varying levels of impacts of depredation, both negative (potential retaliation from fishers) and positive (food provisioning), on their life history traits, and may explain the contrasted demographic patterns observed within the declining population at Crozet but also potentially within the many other killer whale populations documented depredating on fisheries catches worldwide. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/ece3.11448
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      – Code: eng
        Text: English
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        PageCount: 14
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      – SubjectFull: Predatory aquatic animals
        Type: general
      – SubjectFull: Bycatches
        Type: general
      – SubjectFull: Fisheries
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      – SubjectFull: Marine fishes
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      – SubjectFull: Societal reaction
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      – SubjectFull: Life history theory
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      – SubjectFull: Killer whale
        Type: general
      – SubjectFull: Crozet Islands
        Type: general
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      – TitleFull: Behavioural heterogeneity across killer whale social units in their response to feeding opportunities from fisheries.
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            NameFull: Guinet, Christophe
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            NameFull: Clua, Eric
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            – D: 01
              M: 05
              Text: May2024
              Type: published
              Y: 2024
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              Value: 14
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