HOME >> BIOLOGY >> NEWS
USGS Finds Sea Otters At Risk From Killer Whales In A Changing Ocean

Because of a lack of Steller sea lions and harbor seals, large numbers of sea otters are being eaten by hungry killer whales in western Alaska waters, according to findings in the October 16 issue of the journal Science. In "Killer Whale Predation on Sea Otters Links Oceanic and Nearshore Ecosystems,"a U.S. Geological Survey biologist and his colleagues at the University of California, Santa Cruz, reported on sharp reductions in sea otter numbers in the North Pacific rim.

"We estimate that between 40,000 and 45,000 sea otters have died since 1990 from killer whale predation in roughly 3,300 kilometers of shoreline," said Jim Estes, a biologist at the Western Ecological Research Center. "This unusual behavior of killer whales toward sea otters ultimately raises questions about the health of our oceans."

In a chain of events possibly initiated by overfishing, said Estes, some killer whales have shifted from ocean feeding to coastal. Their usual diet is Steller sea lions and harbor seals, but populations of these marine mammals recently declined in the North Pacific. While no one knows for certain why these populations crashed, it is believed to be linked to a shift in abundance and kinds of food fish, making food a problem for fish-eating species. Estes said other researchers have reported the fish change possibly resulted from a combination of three factors -- expanding fisheries, increases in ocean temperature, and a depletion of large whales.

After ranging into coastal waters, the killer whales found a substitute prey in sea otters. Fewer sea otters, said Estes, allowed sea urchins to increase in numbers and strip coastal kelp forests. Estes and his colleagues are concerned about how events occurring far out to sea are profoundly affecting shorelife. This dramatic change in how ocean and coastal systems are being linked may affect numerous marine and coastal species, the authors concluded.

The researchers calculated that a killer whale on
'"/>

Contact: Catherine Haecker
catherine_haecker@usgs.gov
703-648-4283
United States Geological Survey
15-Oct-1998


Page: 1 2 3 4

Related biology news :

1. Very-Low-Fat Diet May Compromise Immune Function, Increase Infection Risk In Trained Runners, UB Study Finds
2. USGS Finds Palila Population Remaining Stable
3. Breast Milk Of Women Who Eat Lake Ontario Fish Contains High Levels Of PCBs, UB Study Finds
4. UB Study Finds No Relationship Between Male Consumption Of Lake Ontario Fish And Conception Delay
5. Botanical Products Act Like Estrogen In Animals, Finds University Of Pittsburgh Team
6. Study Of Childrens Fillings Finds No Mercury Exposure
7. USGS Finds That Mysterious Arkansas Bald Eagle Disease Has Spread To Ducks In Eastern States
8. Study Finds Choline Deficiency Harms Memory Center In Mammals Brains
9. AIDS Virus May Evolve Differently In Cerebrospinal Fluid Compared With Blood In Some Patients, UCSF/Gladstone Research Finds
10. Nationwide Study Finds HIV-Positive Women Are At High Risk For Cervical Human Papillomavirus Infection
11. Study Finds Protein Clues To Early Embryo Development

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: USGS Finds Sea Otters Risk From Killer Whales Changing Ocean

(Date:3/20/2015)... , Mar. 19, 2015 Research and Markets ... "Hand Geometry - Global Strategic Business Report" report ... markets for Hand Geometry in US$ Thousands. The report provides ... , Japan , Europe ... , and Rest of World. Annual estimates ...
(Date:3/20/2015)... , Mar. 19, 2015 Research and Markets ... "Iris Biometrics - Global Strategic Business Report" report ... markets for Iris Biometrics in US$ Thousands. The report provides ... , Japan , Europe ... , and Latin America . ...
(Date:3/18/2015)... , March 18, 2015 As mobile ... new revolutionary smart wallets and apps continue to be introduced ... entrenched in the mobile payment industry in focus today are:  ... Ltd. (NYSE: BABA ), Apple Inc. (NASDAQ: ... and Facebook Inc. (NASDAQ: FB ) ...
Breaking Biology News(10 mins):Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 2Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 3Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 4Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 2Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 3Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 4Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 5Revolutionary Smart Wallet & Mobile Payment Choices Change the Game for Consumers - Company Begins Shipping Newest Digital Wallet to Customers 2Revolutionary Smart Wallet & Mobile Payment Choices Change the Game for Consumers - Company Begins Shipping Newest Digital Wallet to Customers 3Revolutionary Smart Wallet & Mobile Payment Choices Change the Game for Consumers - Company Begins Shipping Newest Digital Wallet to Customers 4Revolutionary Smart Wallet & Mobile Payment Choices Change the Game for Consumers - Company Begins Shipping Newest Digital Wallet to Customers 5Revolutionary Smart Wallet & Mobile Payment Choices Change the Game for Consumers - Company Begins Shipping Newest Digital Wallet to Customers 6
(Date:4/1/2015)... 2015 Synthetic Biologics, Inc. (NYSE MKT: ... infections and diseases, with a focus on protecting ... the development of SYN-004, the Company,s candidate therapy ... within the gastrointestinal (GI) tract and maintain the ... prevention of C. difficile infection, antibiotic-associated ...
(Date:4/1/2015)... (PRWEB) April 01, 2015 Earlier this ... a vibrant life sciences industry association that represents research-based ... members. , Jonathan Parker, AJO’s Vice President of ... Dinner in February, an event that attracted over 750 ... Don Wright, a 73 year old cancer survivor shared ...
(Date:3/31/2015)... VANCOUVER , March 31, 2015  /PRNewswire/ - ESSA Pharma ... that it has filed with the Food and Drug ... ("IND") application related to the Company,s proposed clinical trial ... IND application is required in order for ESSA to ... The IND application is a complete description ...
(Date:3/31/2015)... , March 31, 2015  Bayer HealthCare ... Institute of Massachusetts Institute of Technology (MIT) and ... discovery. The goal of this new part of ... genetics to help create new cardiovascular therapies. ... with the Broad Institute to the area of ...
Breaking Biology Technology:Synthetic Biologics' SYN-004 Clinical Data for Protection of Microbiome Selected for Poster Presentation at American Society of Microbiology 2015 2Synthetic Biologics' SYN-004 Clinical Data for Protection of Microbiome Selected for Poster Presentation at American Society of Microbiology 2015 3Synthetic Biologics' SYN-004 Clinical Data for Protection of Microbiome Selected for Poster Presentation at American Society of Microbiology 2015 4HR Consulting Firm, A.J. O'Connor Associates Joins BioNJ – The Vibrant 400 Member Strong Life Sciences Industry Association - and Attends its Annual Dinner 2ESSA Pharma Inc. Announces Filing of Investigational New Drug Application for EPI-506 2ESSA Pharma Inc. Announces Filing of Investigational New Drug Application for EPI-506 3ESSA Pharma Inc. Announces Filing of Investigational New Drug Application for EPI-506 4Bayer HealthCare Expands Collaboration with Broad Institute of MIT and Harvard to Develop Therapies for Cardiovascular Disease 2Bayer HealthCare Expands Collaboration with Broad Institute of MIT and Harvard to Develop Therapies for Cardiovascular Disease 3
Cached News: