Navigation Links
Study shows loss of 15-42 percent of mammals in North America
Date:12/17/2009

So it looks like we are going into another one of these extinction events."

"I'm optimistic that, because we haven't lost those species yet, if we redouble our conservation efforts we can stem the tide of extinctions and have those species around in the future," he added.

The study's 30 million-year timeline allowed the researchers to compare species diversity over a period of dramatic change in the landscape. The Rocky Mountains and Sierra Nevada ranges formed in the West, while there were dramatic swings in climate that may have been larger than and as fast as the Earth is seeing today, said co-author and UC Berkeley research associate Marc A. Carrasco. Yet these changes did not have a great effect on mammal diversity, compared to what happened when the last glacial period ended, the ice retreated in North America, and humans crossed from Asia into America.

"The only difference is that 13,000 years ago humans appear on the scene," Carrasco said. "The bottom line is, mammals in general were able to deal with these changes in the past. Only when humans arrive do the numbers fall off a cliff."

The analysis by Barnosky, Carrasco and Russell W. Graham, professor of geosciences at Penn State in University Park, Pa., appears online this week in the open-access journal PLoS One.

Their analysis combined two databases compiled over the past 15 years ago by Graham and one database created by a UC Berkeley team led by Barnosky and Carrasco in the past few years. Graham's databases are FAUNMAP I, which lists all mammal fossils and their geographic ranges in the United States between 40,000 and 500 years ago, and FAUNMAP II, a compilation of mammalian fossils dating from 40,000 to 5 million years ago. The UC Berkeley database is MIOMAP, which includes all fossil occurrences in the U.S. between 5 and 30 million years ago, which covers the Miocene and part of the Oligocene periods. The databases include all terrestrial mammals f
'/>"/>

Contact: Robert Sanders
rsanders@berkeley.edu
510-643-6998
University of California - Berkeley
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. UA-led study grapples with health effects of low-intensity warfare
2. Killer catfish? Venomous species surprisingly common, study finds
3. Berkeley Lab researchers participate in Homeland Security study of subway airflow
4. Study reveals H1N1 unexpected weakness
5. Tropical birds waited for land crossing between North and South America: UBC study
6. Studying hair of ancient Peruvians answers questions about stress
7. Study confirms association between tobacco smoke and behavioral problems in children
8. Study reveals how Arctic food webs affect mercury in polar bears
9. Study finds new relationship between gene duplication and alternative splicing in plants
10. Spices halt growth of breast stem cells, U-M study finds
11. Study shows nearly 1/3 of human genome is involved in gingivitis
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/21/2014)... of the water window? It consists of radiations in ... absorbed by the water in biological tissues. New theoretical ... radiations within the water window. These could be the ... image of the biological samples or to be used ... the physical mechanism needed to efficiently generate the harmonic ...
(Date:8/21/2014)... standards process, will be available soon and will improve ... in the OnlineFirst version of Nutrition in Clinical ... the American Society for Parenteral and Enteral Nutrition (A.S.P.E.N.), ... misconnection that can be harmful and even fatal to ... medical devices, components, and accessories to deliver fluids or ...
(Date:8/21/2014)... a novel and versatile modeling strategy to simulate polyelectrolyte ... as well as for studying polyelectrolytes, including DNA and ... much larger and more complex polyelectrolyte systems, and to ... author of a paper on the work and a ... and Engineering. "This is a big step forward for ...
Breaking Biology News(10 mins):Water window imaging opportunity 2New feeding tube connectors will improve patient safety 2Researchers develop models to study polyelectrolytes, including DNA and RNA 2
... Bats use a combination of cues in their hunting sequence ... to attack, catch and consume and which ones they are ... Eavesdropping bats first listen to their prey, then they assess ... Dr. Rachel Page and her team from the Smithsonian Tropical ...
... Centre of Finland have in collaboration with the University ... Therapies Corp. and Pharmatest Services Ltd, discovered a novel ... and showed that heparin-like compounds can potentially be used ... These findings were published on the Molecular Cancer ...
... the University of Queensland has found a better way to ... to the May issue of the prestigious journal Nature ... called Acacia. Acacia analyses the output of next-generation gene ... Ts and Gs the ,bases, that code for DNA ...
Cached Biology News:What sounds good doesn't always taste good 2New approach to 'spell checking' gene sequences 2
(Date:8/21/2014)... 2014  Four-dimensional (4-D) printing develops materials that ... stimuli such as changes in temperature. This advanced ... in multiple industries.  In the near future, 4-D ... objects ranging from human organs to parts used ... Logo - http://photos.prnewswire.com/prnh/20140820/138289 ...
(Date:8/21/2014)... Bulgaria (PRWEB) August 21, 2014 ... released today by Ontotext . Now the ... semantic analysis of structured and unstructured data is available ... the cost of enterprise technology. Organizations that do not ... for data management can use S4 since there is ...
(Date:8/21/2014)... 2014 SoundConnect , a ... as one of the nation’s Fastest Growing Private ... the 2nd consecutive year. Inc. magazine today ranked ... 500|5000, an exclusive ranking of the nation's fastest-growing ... look at the most important segment of the ...
(Date:8/20/2014)... 2014 Clintrax Global, Inc., a worldwide ... Raleigh, NC , recently announced the ... President of Administration. As Vice ... processes, including their alignment with company objectives and ... as an HR executive, specializing in needs assessments, ...
Breaking Biology Technology:Frost & Sullivan: 4-D Printing to Usher in Age of Low-Labor, Fast-Paced Product Manufacturing 2Frost & Sullivan: 4-D Printing to Usher in Age of Low-Labor, Fast-Paced Product Manufacturing 3Frost & Sullivan: 4-D Printing to Usher in Age of Low-Labor, Fast-Paced Product Manufacturing 4Ontotext Releases Text Mining & Semantic Technology Running in the Cloud – Welcome to “S4? 2Ontotext Releases Text Mining & Semantic Technology Running in the Cloud – Welcome to “S4? 3Ontotext Releases Text Mining & Semantic Technology Running in the Cloud – Welcome to “S4? 4SoundConnect Returns on Inc. 5000 List of Fastest Growing Companies 2SoundConnect Returns on Inc. 5000 List of Fastest Growing Companies 3Clintrax Global, Inc. Announces Addition to Executive Team 2
... Pivotal VeraTag(TM) Study ... Initiated ... 4:30 p.m. ET --, SOUTH SAN FRANCISCO, Calif., Oct. 24 Monogram,Biosciences, ... 30, 2007. Third Quarter Results The Company had revenue of $10.4 ...
... Anadys Pharmaceuticals,Inc. (Nasdaq: ANDS ), a biopharmaceutical company ... the areas of hepatitis C and,oncology, announced today that ... November 1, 2007, after the U.S. financial markets,close. ... discuss its third,quarter financial results and operational highlights and ...
... Factors, MUNDELEIN, Ill., Oct. 24 ... has been awarded a hematology contract extension,by ... The,extension agreement provides MedAssets, customers access to ... October,1, 2007, said John Kershaw, President, Sysmex ...
Cached Biology Technology:Monogram Announces Third Quarter 2007 Financial Results 2Monogram Announces Third Quarter 2007 Financial Results 3Monogram Announces Third Quarter 2007 Financial Results 4Monogram Announces Third Quarter 2007 Financial Results 5Monogram Announces Third Quarter 2007 Financial Results 6Monogram Announces Third Quarter 2007 Financial Results 7Monogram Announces Third Quarter 2007 Financial Results 8Monogram Announces Third Quarter 2007 Financial Results 9Monogram Announces Third Quarter 2007 Financial Results 10Monogram Announces Third Quarter 2007 Financial Results 11Monogram Announces Third Quarter 2007 Financial Results 12Monogram Announces Third Quarter 2007 Financial Results 13Anadys Pharmaceuticals to Report Third Quarter 2007 Financial Results 2Sysmex America Awarded MedAssets Supply Chain Systems Hematology Contract Extension 2
... exciting new chapter to a ... Agilents 7890A GC gives you ... your lab to the next ... performance, including advanced separation capabilities, ...
The essence of fluorescence analysis is sensitivity. The high throughput optical system in the RF-5301PC employs a blazed holographic grating, photomultiplier and digital signal processing to provide...
Kit for BASE20/50 dual control unit, includes mounting plate, HOLDER50T, HEATERPAD50, SRTDX temperature probe(s)....
... The transformation of Saccharomyces cerevisiae, as well ... procedure in many molecular biology laboratories. The ... efficiencies with plasmid and linear DNAs using ... made routine plasmid transformations and library screening ...
Biology Products: