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Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile
Hückstädt, L.A.; Antezana, T. (2004). Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile. Sci. Mar. (Barc.) 68(2): 295-298. https://dx.doi.org/10.3989/scimar.2004.68n2295
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, more
Peer reviewed article  

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Keywords
    Orcinus orca (Linnaeus, 1758) [WoRMS]; Otaria flavescens Shaw, 1800 [WoRMS]
    Marine/Coastal

Authors  Top 
  • Hückstädt, L.A.
  • Antezana, T.

Abstract
    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.

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