Navigation Links
Seal rookeries could provide a reliable food source for endangered California condors, study finds

birds that died in the wild between 1993 and 2001; 60 historical birds that lived from 1797 to 1965; and 10 ancient condors that died in the Rancho La Brea tar pits in Los Angeles during the Pleistocene epoch between 11,000 and 36,000 years ago.

Bone or hair samples were also collected from potential prey, including Pleistocene bison and horses, as well as dozens of 20th-century mule deer, feral pigs, whales, seals, sea lions and domesticated cattle. "The California Department of Transportation even agreed to go around and snip off hair from dead deer killed on the highway," Chamberlain says. "Other people went around picking up samples from dead seals on beaches. We ended up getting an incredibly large database on hundreds of animals."

Dietary shifts

The isotopic data revealed that condors are likely to have undergone two major dietary shifts since the Pleistocene. "The first occurred from the end of the Ice Age about 11,000 years ago to historical times, and the second took place between the 18th century and the modern era," Chamberlain says, adding that both events coincide with the arrival of humans in North America.

"During the Pleistocene, condors were distributed across the continent," he explains. "There was plenty of megafauna to feed on, including mammoths, mastodons, camels and bison."

Isotopic analysis of ancient condor bones from the La Brea tar pits revealed that about 40 percent of Pleistocene birds fed primarily on marine species, the rest on a mixture of marine mammals and giant land mammals.

"When the Ice Age ended, most of the terrestrial megafauna vanished," Chamberlain says. "There's a theory that they were killed off by humans, and as a result, the condors that lived inland no longer had large prey to feed on."

The disappearance of terrestrial megafauna caused the first major dietary shift, according to the authors. "Our paper shows that condors on the West Coast survived the Ple
'"/>

Source:Stanford University


Page: 1 2 3 4 5

Related biology news :

1. Protein discovery could unlock the secret to better TB treatment
2. Tiny particles could solve billion-dollar problem
3. First atlas of key brain genes could speed research on cancer, neurological diseases
4. Discovery of key proteins shape could lead to improved bacterial pneumonia vaccine
5. A comprehensive response to HIV could prevent 10 million AIDS deaths in Africa by 2020
6. How the environment could be damaging mens reproductive health
7. Dead zone area in Gulf could be increasing, researchers say
8. Growth in biomass could put US on road to energy independence
9. Nano-bumps could help repair clogged blood vessels
10. Researchers develop assay that could be applied to drug screening
11. Currents could disrupt ocean food chain
Post Your Comments:
(Date:2/12/2015)... Minn. , Feb. 12, 2015   ... company specializing in clinical study management systems, has ... Program , further distinguishing iMedNet ... Clinical Research Organizations (CROs) and healthcare consultants.  Building ... support, prospective customer referrals and numerous co-marketing opportunities), ...
(Date:2/9/2015)... , Feb. 9, 2015  Lintec of America ... methods for carbon nanotube (CNT) macrostructures, including sheets, yarns ... Dallas (UTD). Leveraging the vast industrial resources ... Tokyo, Japan , Lintec of America is forming ... Richardson, TX , focusing on scaling up the ...
(Date:2/5/2015)... , Jan. 26, 2015 NXT-ID, Inc. (NASDAQ: ... a biometric authentication company focused on the growing mobile ... website ( http://www.nxt-id.com/ ) as part of its 2015 ... The Company launched its new consumer website for Wocketwallet.com ... , CEO of NXT-ID said, "Our new corporate website ...
Breaking Biology News(10 mins):MedNet Solutions Announces Key Enhancements To Its iMedNet Partner Program 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 3Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 4NXT-ID, Inc. Launches New Corporate Website As Part Of Ongoing 2015 Branding Initiatives For Wocket Smart Wallet 2NXT-ID, Inc. Launches New Corporate Website As Part Of Ongoing 2015 Branding Initiatives For Wocket Smart Wallet 3
... the impact of age on the growth rates of cellular ... model the growth of bacteria, and could provide new insights ... which appears in Evolution: International Journal of Organic Evolution ... the University of Tokyo. When bacterial cells age, their ...
... that the relative likelihood of conceiving in the month ... than if you,re an adult. "It certainly is ... Professor in the Queen,s University Departments of Obstetrics & ... Hospital, and co-author of the paper. "This adolescent pregnancy ...
... research flights from the Arctic to the Antarctic has ... particles in the atmosphere, scientists announced today. The ... to generate the first detailed mapping of the global ... The series of flights, which come to an ...
Cached Biology News:Scientists offer way to address 'age-old' questions 2Scientists offer way to address 'age-old' questions 3First global portrait of greenhouse gases emerges from pole-to-pole flights 2First global portrait of greenhouse gases emerges from pole-to-pole flights 3First global portrait of greenhouse gases emerges from pole-to-pole flights 4
(Date:3/1/2015)... 2015 Market Publishers Ltd and ... market research promotion on Internet. MarketPublishers.com is now ... out by DataGroup Booksellers. , Natalie Aster, Assistant ... commented on the recent partnership agreement as follows: ... our team of publishers. Since 1974, the company ...
(Date:2/27/2015)... Feb. 27, 2015 A paper published ... rare-diseases portfolio " in Science Translational Medicine, ... technique to reduce the risk associated with investing ... unlock new levels of funding for developing so-called ... a unique collaboration between scientists at the National ...
(Date:2/27/2015)... SAN DIEGO , Feb. 27, 2015  Pfenex ... in the development of biosimilar therapeutics, today announced that ... San Francisco Marriott Marquis on March 2 nd ... will participate on a panel discussing the current state ... World of Biosimilars . For more ...
(Date:2/26/2015)... , Feb. 26, 2015 S&P Capital ... Factual Stock Report coverage on MabVax Therapeutics Holdings Inc ... is a clinical stage biotechnology company focused on the ... medical needs in the treatment of cancer. MabVax has ... on the protective immune responses generated by patients who ...
Breaking Biology Technology:Market Publishers Ltd and DataGroup Booksellers Sign Partnership Agreement 2Market Publishers Ltd and DataGroup Booksellers Sign Partnership Agreement 3New Financing Technique May Hold Key to Unlocking Funding for Rare Diseases 2New Financing Technique May Hold Key to Unlocking Funding for Rare Diseases 3New Financing Technique May Hold Key to Unlocking Funding for Rare Diseases 4S&P Capital IQ Initiates Coverage on MabVax Therapeutics Holdings Inc. in S&P Capital IQ Factual Stock Reports 2S&P Capital IQ Initiates Coverage on MabVax Therapeutics Holdings Inc. in S&P Capital IQ Factual Stock Reports 3S&P Capital IQ Initiates Coverage on MabVax Therapeutics Holdings Inc. in S&P Capital IQ Factual Stock Reports 4S&P Capital IQ Initiates Coverage on MabVax Therapeutics Holdings Inc. in S&P Capital IQ Factual Stock Reports 5
... 1 Eisai Co., Ltd.,(Headquarters: Tokyo, President & ... of North America (Headquarters: New Jersey,the United States, ... in the schedule for submission to the U.S. ... Application (NDA) for E7389 (generic,name: eribulin mesylate) for ...
... 1 , - ENDORSE Global Findings Highlight ... VTE Management: Systematically Assess,Patient Risk for VTE and ... multinational study (Epidemiologic International Day for the,Evaluation of ... Acute,Hospital Care Setting) published today in the LANCET(1) ...
... CV Therapeutics,Inc. (Nasdaq: CVTX ) today announced that ... community in New York City on Thursday, February 7,2008 ... be webcast live and available for replay on the,company,s ... CV Therapeutics, Inc., headquartered in Palo Alto, California, ...
Cached Biology Technology:Eisai Announces Change in U.S. Submission Schedule for E7389 New Drug Application 2Eisai Announces Change in U.S. Submission Schedule for E7389 New Drug Application 3The LANCET Published ENDORSE, the Largest Multinational Study Showing That the Majority of Hospitalized Patients Surveyed are at Risk for VTE and Many do not Receive Recommended VTE Prophylaxis 2The LANCET Published ENDORSE, the Largest Multinational Study Showing That the Majority of Hospitalized Patients Surveyed are at Risk for VTE and Many do not Receive Recommended VTE Prophylaxis 3The LANCET Published ENDORSE, the Largest Multinational Study Showing That the Majority of Hospitalized Patients Surveyed are at Risk for VTE and Many do not Receive Recommended VTE Prophylaxis 4CV Therapeutics to Host Investor Science Day on Thursday, February 7, 2008 2
... shakers have the durability to ... 3-high, and the uniformity and ... shake" applications. Heavily built ... our stackers are designed for ...
... Acquire images with any of UVP's Doc-It ... the Doc-It 1D Analysis software onto your ... image analysis functions and enhancement tools. Doc-It ... band finding algorithms for quick and accurate ...
CQCS kit for first KR 4i , (first unit)....
... Multidrop Combi is a new generation dispenser ... dispensing with the proven performance of the existing ... cover large volume area starting from 500 nl ... the range. ,It is optimized for ...
Biology Products: