Navigation Links
What do killer whales eat in the Arctic?
Date:1/29/2012

Killer whales (Orcinus orca) are the top marine predator, wherever they are found, and seem to eat everything from schools of small fish to large baleen whales, over twice their own size. The increase in hunting territories available to killer whales in the Arctic due to climate change and melting sea ice could seriously affect the marine ecosystem balance. New research published in BioMed Central's re-launched open access journal Aquatic Biosystems has combined scientific observations with Canadian Inuit traditional knowledge to determine killer whale behaviour and diet in the Arctic.

Orca have been studied extensively in the northeast Pacific ocean, where resident killer whales eat fish, but migrating whales eat marine mammals. Five separate ecotypes in the Antarctic have been identified, each preferring a different type of food, and similar patterns have been found in the Atlantic, tropical Pacific, and Indian oceans. However, little is known about Arctic killer whale prey preference or behaviour.

Traditional Ecological Knowledge (TEK) is increasingly being used to supplement scientific observations. Researchers from Manitoba visited 11 Canadian Nunavut Inuit communities and collated information from over 100 interviews with hunters and elders.

The Inuit reported that killer whales would 'eat whatever they can catch', mainly other marine mammals including seals (ringed, harp, bearded, and hooded) and whales (narwhal, beluga and bowhead). However there was no indication that Arctic killer whales ate fish. Only seven of the interviewees suggested that killer whales ate fish, but none of them had ever seen it themselves.

The type of reported prey varied between areas. Most incidences of killer whales eating bowhead whales occurred in Foxe Basin and narwhal predation was more frequent around Baffin Island. Inuit were also able to describe first-hand how killer whales hunted, including several reports of how killer whales co-operated to kill the much larger bowhead. During the hunt some whales were seen holding the bowhead's flippers or tail, others covering its blowhole, and others biting or ramming to cause internal damage. Occasionally dead bowheads, with bite marks and internal injuries but with very little eaten, are found by locals.

'Aarlirijuk', the fear of killer whales, influenced prey behaviour with smaller mammals seeking refuge in shallow waters or on shore and larger prey running away, diving deep, or attempting to hide among the ice. Even narwhal, which are capable of stabbing a killer whale with their tusks (although this is likely to result in the deaths of both animals), will run to shallow waters and wait until the whales give up.

Killer whales are seasonal visitors to the area and have recently started colonising Hudson Bay (possibly due to loss of summer sea ice with global warming). Local communities are reliant on the very species that the orcas like to eat. Dr Steven Ferguson from the University of Manitoba who led this research commented, "Utilising local knowledge through TEK will help scientists understand the effects of global warming and loss of sea ice on Arctic species and improve collaborative conservation efforts in conjunction with local communities."

Aquatic Biosystems, (previously Saline Systems), which re-launches today, publishes basic and applied research on aquatic organisms and environments, bridging across freshwater and saline systems from gene systems to ecosystems.


'/>"/>

Contact: Dr. Hilary Glover
hilary.glover@biomedcentral.com
44-203-192-2370
BioMed Central
Source:Eurekalert  

Related biology news :

1. Dinosaurs with killer claws yield new theory about flight
2. Scientific sleuths pinpoint the guilty coral killers
3. Antarctic killer whales may seek spa-like relief in the tropics
4. From mild-mannered to killer plague
5. Paternity testing helps fill in family tree for Puget Sounds killer whales
6. How killer immune cells avoid killing themselves
7. Scientists track evolution and spread of deadly fungus, one of the worlds major killers
8. NOAA scientists find killer whales in Antarctic waters prefer weddell seals over other prey
9. Natural (born) killers: What do they really do?
10. Killer paper for next-generation food packaging
11. Monitoring killer mice from space
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
What do killer whales eat in the Arctic?
(Date:2/3/2016)... , Feb. 3, 2016 ... addition of the "Emotion Detection and ... Learning, and Others), Software Tools (Facial Expression, ... End Users,and Regions - Global forecast to ... --> http://www.researchandmarkets.com/research/d8zjcd/emotion_detection ) has announced ...
(Date:2/2/2016)... NEW YORK , Feb. 2, 2016 Technology ... service presents an analysis of the digital and computed ... Malaysia , and Indonesia ... current trends and market size, as well as regional ... by country and discusses market penetration and market attractiveness, ...
(Date:2/1/2016)...  Today, the first day of American Heart Month, ... a first of its kind workplace health solution that ... the first application of Watson ... and Welltok will create a new offering that combines ... delivered on Welltok,s health optimization platform. The effort is ...
Breaking Biology News(10 mins):
(Date:2/8/2016)... 8, 2016  BioElectronics Corporation (OTC Pink: BIEL), ... today that it is responding to a notice ... Securities and Exchange Commission posted on the agency ... of the Board of BioElectronics Corporation and the ... at The Fuqua School of Business, Duke University.   ...
(Date:2/8/2016)... Conn. , Feb. 8, 2016  NanoViricides, Inc. (NYSE MKT: ... its CEO, Eugene Seymour , MD, MPH, will present information ... at the Waldorf-Astoria Hotel in New York City ... will be in the Windsor Room at 5:30PM EST. Registered attendees ... New York City . --> ...
(Date:2/6/2016)... ... 06, 2016 , ... The Center for Excellence in Education (CEE) will sponsor ... on Wednesday February 10, 2016. This Bite of Science session, hosted by the ... at 1500 Remount Road in Front Royal, VA from 5:00 p.m. to 8:00 p.m. ...
(Date:2/5/2016)... DIEGO , Feb. 5, 2016 On ... region,s trusted information source for community, health and disaster ... Diego) will integrate to enhance care coordination and ... to the services they need and to better connect ... improve care.   San Diego ...
Breaking Biology Technology: