Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile
The killer whale is an opportunistic top-predator of ecosystems worldwide and its diet varies locally and seasonally, which is reflected in diverse feeding behaviours associated with its prey. We report the occurrence of killer whales presumably predating on southern sea lions associated with the ja...
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2004-06-01
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| Series: | Scientia Marina |
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| Online Access: | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/369 |
| _version_ | 1819095430434127872 |
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| author | Luis Hückstädt Tarsicio Antezana |
| author_facet | Luis Hückstädt Tarsicio Antezana |
| author_sort | Luis Hückstädt |
| collection | DOAJ |
| description | The killer whale is an opportunistic top-predator of ecosystems worldwide and its diet varies locally and seasonally, which is reflected in diverse feeding behaviours associated with its prey. We report the occurrence of killer whales presumably predating on southern sea lions associated with the jack mackerel fishing fleet in central Chile. The presence of killer whales was recorded during 4 fishing sets. All sightings consisted of 3-5 individual pods of females and calves. The number of sea lions was not significantly affected by the presence of killer whales, but their behaviour was, by reducing the number of behavioural displays, as they stopped feeding and resting activities and stayed close to the hull of the vessel after net retrieval ended. We propose that killer whales could be using the fishery as an indirect source of prey to benefit from the aggregation of sea lions around the vessel, far away from land. |
| first_indexed | 2024-12-21T23:43:11Z |
| format | Article |
| id | doaj.art-e92615162847468ca7d0fbe6942069e7 |
| institution | Directory Open Access Journal |
| issn | 0214-8358 1886-8134 |
| language | English |
| last_indexed | 2024-12-21T23:43:11Z |
| publishDate | 2004-06-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Scientia Marina |
| spelling | doaj.art-e92615162847468ca7d0fbe6942069e72022-12-21T18:46:10ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342004-06-0168229529810.3989/scimar.2004.68n2295365Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central ChileLuis Hückstädt0Tarsicio Antezana1Departamento de Oceanografía, Universidad de ConcepciónDepartamento de Oceanografía, Universidad de ConcepciónThe killer whale is an opportunistic top-predator of ecosystems worldwide and its diet varies locally and seasonally, which is reflected in diverse feeding behaviours associated with its prey. We report the occurrence of killer whales presumably predating on southern sea lions associated with the jack mackerel fishing fleet in central Chile. The presence of killer whales was recorded during 4 fishing sets. All sightings consisted of 3-5 individual pods of females and calves. The number of sea lions was not significantly affected by the presence of killer whales, but their behaviour was, by reducing the number of behavioural displays, as they stopped feeding and resting activities and stayed close to the hull of the vessel after net retrieval ended. We propose that killer whales could be using the fishery as an indirect source of prey to benefit from the aggregation of sea lions around the vessel, far away from land.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/369orcinus orcakiller whaleotaria flavescenssouthern sea lionpurse seine fisherycentral chile |
| spellingShingle | Luis Hückstädt Tarsicio Antezana Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile Scientia Marina orcinus orca killer whale otaria flavescens southern sea lion purse seine fishery central chile |
| title | Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile |
| title_full | Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile |
| title_fullStr | Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile |
| title_full_unstemmed | Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile |
| title_short | Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile |
| title_sort | behaviour of southern sea lions in presence of killer whales during fishing operations in central chile |
| topic | orcinus orca killer whale otaria flavescens southern sea lion purse seine fishery central chile |
| url | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/369 |
| work_keys_str_mv | AT luishuckstadt behaviourofsouthernsealionsinpresenceofkillerwhalesduringfishingoperationsincentralchile AT tarsicioantezana behaviourofsouthernsealionsinpresenceofkillerwhalesduringfishingoperationsincentralchile |