Increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations
Fisheries can generate feeding opportunities for large marine predators in the form of discards or accessible catch. How the use of this anthropogenic food may spread as a new behaviour, across individuals within populations over time, is poorly understood. This study used a 16-year (2003–2018) moni...
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ftdeakinunifig:oai:figshare.com:article/20623089 2024-06-23T07:54:22+00:00 Increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations M Amelot F Plard C Guinet John Arnould N Gasco P Tixier 2022-02-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30162205 https://figshare.com/articles/journal_contribution/Increasing_numbers_of_killer_whale_individuals_use_fisheries_as_feeding_opportunities_within_subantarctic_populations/20623089 unknown http://hdl.handle.net/10536/DRO/DU:30162205 https://figshare.com/articles/journal_contribution/Increasing_numbers_of_killer_whale_individuals_use_fisheries_as_feeding_opportunities_within_subantarctic_populations/20623089 All Rights Reserved Marine and estuarine ecology (incl. marine ichthyology) Animal behaviour BEHAVIOR Biology capture-mark-recapture CROZET depredation Ecology Environmental Sciences & Ecology Evolutionary Biology killer whales Life Sciences & Biomedicine Life Sciences & Biomedicine - Other Topics LONGLINE FISHERY ORCINUS-ORCA Science & Technology TOOTHFISH School of Life and Environmental Sciences 3103 Ecology 3109 Zoology Text Journal contribution 2022 ftdeakinunifig 2024-06-06T02:05:01Z Fisheries can generate feeding opportunities for large marine predators in the form of discards or accessible catch. How the use of this anthropogenic food may spread as a new behaviour, across individuals within populations over time, is poorly understood. This study used a 16-year (2003–2018) monitoring of two killer whale Orcinus orca subantarctic populations ( regular and Type-D at Crozet), and Bayesian multistate capture–mark–recapture models, to assess temporal changes in the number of individuals feeding on fish caught on hooks (‘depredation’ behaviour) of a fishery started in 1996. For both populations, the number of depredating individuals increased during the study period (34 to 94 for regular 17 to 43 for Type-D ). Increasing abundance is unlikely to account for this and, rather, the results suggest depredation was acquired by increasing numbers of existing individuals. For regular killer whales, a plateau reached from 2014 suggests that it took 18 years for the behaviour to spread across the whole population. A more recent plateau was apparent for Type-D s but additional years are needed to confirm this. These findings show how changes in prey availability caused by human activities lead to rapid, yet progressive, innovations in killer whales, likely altering the ecological role of this top-predator. Article in Journal/Newspaper Killer Whale Orca Orcinus orca Killer whale DRO - Deakin Research Online |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Marine and estuarine ecology (incl. marine ichthyology) Animal behaviour BEHAVIOR Biology capture-mark-recapture CROZET depredation Ecology Environmental Sciences & Ecology Evolutionary Biology killer whales Life Sciences & Biomedicine Life Sciences & Biomedicine - Other Topics LONGLINE FISHERY ORCINUS-ORCA Science & Technology TOOTHFISH School of Life and Environmental Sciences 3103 Ecology 3109 Zoology |
spellingShingle |
Marine and estuarine ecology (incl. marine ichthyology) Animal behaviour BEHAVIOR Biology capture-mark-recapture CROZET depredation Ecology Environmental Sciences & Ecology Evolutionary Biology killer whales Life Sciences & Biomedicine Life Sciences & Biomedicine - Other Topics LONGLINE FISHERY ORCINUS-ORCA Science & Technology TOOTHFISH School of Life and Environmental Sciences 3103 Ecology 3109 Zoology M Amelot F Plard C Guinet John Arnould N Gasco P Tixier Increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations |
topic_facet |
Marine and estuarine ecology (incl. marine ichthyology) Animal behaviour BEHAVIOR Biology capture-mark-recapture CROZET depredation Ecology Environmental Sciences & Ecology Evolutionary Biology killer whales Life Sciences & Biomedicine Life Sciences & Biomedicine - Other Topics LONGLINE FISHERY ORCINUS-ORCA Science & Technology TOOTHFISH School of Life and Environmental Sciences 3103 Ecology 3109 Zoology |
description |
Fisheries can generate feeding opportunities for large marine predators in the form of discards or accessible catch. How the use of this anthropogenic food may spread as a new behaviour, across individuals within populations over time, is poorly understood. This study used a 16-year (2003–2018) monitoring of two killer whale Orcinus orca subantarctic populations ( regular and Type-D at Crozet), and Bayesian multistate capture–mark–recapture models, to assess temporal changes in the number of individuals feeding on fish caught on hooks (‘depredation’ behaviour) of a fishery started in 1996. For both populations, the number of depredating individuals increased during the study period (34 to 94 for regular 17 to 43 for Type-D ). Increasing abundance is unlikely to account for this and, rather, the results suggest depredation was acquired by increasing numbers of existing individuals. For regular killer whales, a plateau reached from 2014 suggests that it took 18 years for the behaviour to spread across the whole population. A more recent plateau was apparent for Type-D s but additional years are needed to confirm this. These findings show how changes in prey availability caused by human activities lead to rapid, yet progressive, innovations in killer whales, likely altering the ecological role of this top-predator. |
format |
Article in Journal/Newspaper |
author |
M Amelot F Plard C Guinet John Arnould N Gasco P Tixier |
author_facet |
M Amelot F Plard C Guinet John Arnould N Gasco P Tixier |
author_sort |
M Amelot |
title |
Increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations |
title_short |
Increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations |
title_full |
Increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations |
title_fullStr |
Increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations |
title_full_unstemmed |
Increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations |
title_sort |
increasing numbers of killer whale individuals use fisheries as feeding opportunities within subantarctic populations |
publishDate |
2022 |
url |
http://hdl.handle.net/10536/DRO/DU:30162205 https://figshare.com/articles/journal_contribution/Increasing_numbers_of_killer_whale_individuals_use_fisheries_as_feeding_opportunities_within_subantarctic_populations/20623089 |
genre |
Killer Whale Orca Orcinus orca Killer whale |
genre_facet |
Killer Whale Orca Orcinus orca Killer whale |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30162205 https://figshare.com/articles/journal_contribution/Increasing_numbers_of_killer_whale_individuals_use_fisheries_as_feeding_opportunities_within_subantarctic_populations/20623089 |
op_rights |
All Rights Reserved |
_version_ |
1802646502286295040 |