Icelandic herring-eating killer whales feed at night
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چکیده
منابع مشابه
Icelandic herring-eating killer whales feed at night
Herring-eating killer whales debilitate herring with underwater tail slaps and likely herd herring into tighter schools using a feeding-specific low-frequency pulsed call ('herding' call). Feeding on herring may be dependent upon daylight, as the whales use their white underside to help herd herring; however, feeding at night has not been investigated. The production of feeding-specific sounds ...
متن کاملAcoustic characteristics of underwater tail slaps used by Norwegian and Icelandic killer whales (Orcinus orca) to debilitate herring (Clupea harengus).
Norwegian killer whales debilitate prey by slapping their tails into herring schools. These underwater tail slaps produce a thud-like sound. It is unclear whether this sound is caused by cavitation and/or physical contact between herring and whale tail. Also the forces causing debilitation of the fish are not understood. Here we present an acoustic analysis of underwater tail slaps using a mult...
متن کامل[Eating at night--eating during sleep].
This 45-years old female, who was referred to us for controlled weight-reduction reports an unusual eating behaviour: No food intake during daytime, uncontrolled eating in the evening and repetitive eating during the night. Eating in the night is a heterogeneous symptom regarding pathogenesis and phenotypic expression. Possible entities are the so called "night-eating syndrome" or "sleep-relate...
متن کاملSeasonal movements of killer whales between Iceland and Scotland
Understanding the movements and distribution of killer whales Orcinus orca is important for evaluating the threats they face, as well as their impact as top predators in different ecosystems. Killer whales in the Northeast Atlantic are thought to follow specific prey stocks but their seasonal movements are still poorly understood. Here, we used recent killer whale photographic data collected in...
متن کاملSonar observations of killer whales (Orcinus orca) feeding on herring schools
Behavior of killer whales feeding on herring schools was recorded with a high frequency (455 kHz) sonar and recorded on a SVHS tape. Synchronization of surfacing behavior of killer whales was analyzed from 8 mm videotapes recorded between 1990–92. Two different feeding techniques, carousel feeding, where killer whales cooperatively herd herring schools into a tight ball towards the surface and ...
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ژورنال
عنوان ژورنال: Marine Biology
سال: 2017
ISSN: 0025-3162,1432-1793
DOI: 10.1007/s00227-016-3059-8