Navigation Links
Decline in Alaskan sea otters affects bald eagles' diet
Date:10/2/2008

Sea otters are known as a keystone species, filling such an important niche in ocean communities that without them, entire ecosystems can collapse. Scientists are finding, however, that sea otters can have even farther-reaching effects that extend to terrestrial communities and alter the behavior of another top predator: the bald eagle.

In nearshore marine communities, towering kelp can reach heights of 250 feet and function much like trees in a forest, providing food, homes and protection for fish and invertebrates. The most important enemies of these giant algae are tiny sea urchins, only inches in diameter, which live on the kelp's holdfasts and eat its tissue. When urchin populations become too large, they can defoliate entire kelp forests, leaving only barren remains.

Enter the sea otter. Otters can eat the spiky urchins whole, making them the major urchin predator. The otters' presence keeps urchin populations in check and maintains the balance of the ecosystem.

Scientists have known about these kelp forest community interactions since the 1970s. But in the October issue of the journal Ecology, Robert Anthony and colleagues report that the presence or absence of otters can also affect the diet of bald eagles, a neighboring terrestrial predator. Anthony is an ecologist with the Oregon Cooperative Fish & Wildlife Research Unit of the U.S. Geological Survey and Oregon State University.

Bald eagles live in high densities along the Aleutian archipelago off the coast of Alaska and place their nests on islets, coastal cliffs and shoreline sea stacks. Historically, more than 90 percent of the eagles' food comes from the ocean. Sea otters once also occupied a large range of coastal marine environments near these islands, but in recent years, otter populations have declined in response to their own main predator.

"All of the available data point to increased numbers of killer whales as the direct cause of the
'/>"/>

Contact: Christine Buckley
christine@esa.org
202-833-8773
Ecological Society of America
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. In scientific first, Einstein researchers correct decline in organ function associated with old age
2. River damming leads to dramatic decline in native fish numbers
3. Great Ape Trusts Wich lead author of Oryx paper on continuing orangutan population declines
4. Understanding autumn rain decline in SE Australia
5. NOAA reports coastal waters show decline in contaminants
6. Changes in ocean conditions in Sargasso Sea potential cause for decline in eel fishery
7. No convincing evidence for decline in tropical forests
8. Decline in uptake of carbon emissions confirmed
9. Films of Mitchell and Kenyon illuminate lefties decline in Victorian England
10. Otters reveal their identity
11. Scientists learn how food affects the brain
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... animals often develop relationships with other group members to ... wild chacma baboons the strategy for grooming activities shows ... just published in the scientific journal Biology Letters ... baboons is not practiced without ulterior motives. To be ... the individual, while grooming another individual can provide access ...
(Date:7/11/2014)... University, Sweden, have explored two different ways that ... leading to the formation of oxygen molecules in ... the scientific journal Nature Communications . , ... synthetic catalysts for water oxidation, which are key ... direct storage of solar energy in fuels like ...
(Date:7/11/2014)... 2014 The increased risk of kidney injury related ... fluids reflects the mass of HES molecules, according to ... journal of the International Anesthesia Research Society (IARS). , ... effect of HES on cultured human renal proximal tubule ... Wunder and colleagues of University Hospital Wrzburg, Austria. ...
Breaking Biology News(10 mins):Baboons groom early in the day to get benefits later 2Molecular snapshots of oxygen formation in photosynthesis 2In lab studies, hydroxyethyl starch has direct harmful effects on kidney cells 2
... mantra of our health-conscious times and is seen as an ... much salt in the diet and specifically sodium ... blood pressure however, scientists have found that salt,s other oft-overlooked ... study by researchers at the University of Glasgow has revealed ...
... for Translational Medicine and Therapeutics, 7th Annual International ... the Science of Scale, to be held in ... to translational science. ITMAT is part of the ... Pennsylvania. , Speakers will include those dealing with ...
... of the Boston Police Department, will ... IEEE International Conference on Technologies for Homeland Security (HST ,13) ... the aftermath of the tragic events of 15 April 2013 ... that ultimately led to the capture of one of the ...
Cached Biology News:Yin-yang effect of sodium and chloride presents salt conundrum 2Lab-on-a-chip tech, brain mapping & microbiome highlighted at translational med meeting 2Boston Police Chief to Address Boston Marathon Bombings at IEEE Homeland Security Conference in Waltham, Mass., on 12 November 2
(Date:7/11/2014)... , July 11, 2014  Researchers have pioneered ... images. The new technology, called Virtual Finger, allows ... structures like neurons and synapses using the flat ... technology makes 3D imaging studies orders of magnitude ... an unprecedented level across many areas of experimental ...
(Date:7/10/2014)... July 10, 2014 Product and ... very low abundance and are often “lost in ... time-consuming. , Join presenters Dr. Rowel Tobias, Senior ... John Anders, Head of Quality at Nanotherapeutics, Inc., ... that can speed detection and quantitation while achieving ...
(Date:7/10/2014)... Mass. (PRWEB) July 10, 2014 Terascala, ... today announced that Alan Swahn, a former vice president ... executive team as vice president of marketing. Terascala’s software ... Dell and NetApp create the highest performance and most ... been appointed to guide Terascala’s channel expansion and broaden ...
(Date:7/10/2014)... OMICS Group’s 5th International conference and exhibition ... at Double Tree by Hilton Beijing, China is all ... & Bioanalytical research methods only to facilitate improved living ... Dr. Srinubabu Gedela, MD of OMICS Group Inc has ... one in bringing a unique and international mix of ...
Breaking Biology Technology:Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 3Novel Ms Techniques Speed Detection of Biopharmaceutical Product and Process Impurities, New Webinar Hosted by Xtalks 2Terascala Expands Executive Team 2Terascala Expands Executive Team 3A Critical Review of Analytical Techniques for Improved Living Standards 2A Critical Review of Analytical Techniques for Improved Living Standards 3A Critical Review of Analytical Techniques for Improved Living Standards 4
... , ,ROCHESTER, Wis. Runzheimer International ... the formation of an exclusive partnership between the ... travel managers within the Concur Expense solution. , ... in travel programs, policy and cost benchmarking information, ...
... about more than the one that got away , ... fish were MILWAUKEE The Medical College of Wisconsin ... its research. It reached an important milestone July 1, when ... marketing and licensing for MCW's Research Foundation . , ...
... Terrace ,Source: UW Communications MADISON - With the University ... the verge of creating two separate statewide networks, Gov. ... combine their efforts. , ,"It's more sensible for taxpayers ... said Doyle spokesperson Dan Leistikow. , ,Initial discussions last ...
Cached Biology Technology:Runzheimer and Concur develop travel management service 2Interview with Medical College of Wisconsin Research Foundation's new director of marketing and licensing 2Interview with Medical College of Wisconsin Research Foundation's new director of marketing and licensing 3Governor tells state, university to work together on IT 2
Microlite 1+ 1x12 Strip assembled, flat bottom; the ideal vessel for low signal luminescent reactions, offering medium binding with enhanced dynamic range, extra high reflectivity and minimal cross t...
Immulon 4 HBX 1x12 Strip, flat bottom; high binding extra surface with special resin and irradiation, offers maximum protein uptake....
... 0-10 psi precision pressure regulator and pressurized syringe ... Faster liquid-switching Steady flow rate Microinjecting ... Can be added to any new ... any third-party manufacturer, even homemade. Connect to house ...
...
Biology Products: