Navigation Links
Man may have caused pre-historic extinctions

New research shows that pre-historic horses in Alaska may have been hunted into extinction by man, rather than by climate change as previously thought.

The discovery by Andrew Solow of Woods Hole Oceanographic Institute, US, David Roberts of the Royal Botanic Garden, Kew and Karen Robbirt of the University of East Anglia (UEA) is published this week in Proceedings of the National Academy of Sciences (PNAS).

The accepted view had previously been that the wild horses became extinct long before the extinction of mammoths and the arrival of humans from Asia - ruling out the possibility that they were over-hunted by man. One theory had been that a period of climate cooling wiped them out.

However, the researchers have discovered that uncertainties in dating fossil remains and the incompleteness of fossil records mean that the survival of the horse beyond the arrival of humans cannot be ruled out.

The PNAS paper develops a new statistical method to help resolve the inherent problems associated with dating fossils from the Pleistocene period. The aim is to provide a far more accurate timetable for the extinction of caballoid horses and mammoths and, ultimately, the cause.

"This research is exciting because it throws open the debate as to whether climate change or over-hunting may have led to the extinction of pre-historic horses in North America," said UEA's Karen Robbirt.

The Pleistocene period refers to the first epoch of the Quarternary period between 1.64 million and 10,000 years ago. It was characterised by extensive glaciation of the northern hemisphere and the evolution of modern man around 100,000 years ago.

It is known that the end of the Pleistocene period was a time of large-scale extinctions of animals and plants in North America and elsewhere but the factors responsible have remained open to question, with climate change and over-hunting by humans the prime suspects.Ends


'"/>

Source:University of East Anglia


Page: 1

Related biology news :

1. UNC launches study of liver injury caused by drugs
2. Oxygen increase caused mammals to triumph, researchers say
3. Blocking the nerve receptor EP1 in mouse models reduces brain damage caused by stroke
4. Stem cell mobilization therapy appears to be ineffective in repairing damage caused by heart attack
5. Whiplash injuries ?are they caused by startle reflexes?
6. Cocaine high caused by interference in neuronal receiving stations
7. Scientists discover new virus caused deaths of transplant recipients from single donor
8. New study may show how to forestall a fatal, virus-caused immune-system meltdown
9. Out-of-body experiences may be caused by arousal system disturbances in brain
10. Super predators and mass extinctions
11. New study pinpoints epicenters of Earths imminent extinctions
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Man may have caused pre historic extinctions

(Date:4/17/2014)... cells in bone marrow need to produce hydrogen sulfide ... according to a new study from the Center for ... Dentistry of USC. , Professor Songtao Shi, principal investigator ... produced by the cells governs the flow of calcium ... signals that results in osteogenesis, or the creation of ...
(Date:4/17/2014)... of forests in the Amazon help create tinderbox ... rapid and widespread forest loss during drought years, ... show that forests in the Amazon could reach ... forest fires lead to large-scale loss of trees, ... professor of geography, Penn State. , "We documented ...
(Date:4/17/2014)... new early-warning signs of the potential loss of sight ... for the diagnosis and treatment of diabetic retinopathy, potentially ... "We had not expected to see such striking changes ... Elsner, professor and associate dean in the IU School ... set out to study the early signs, in volunteer ...
Breaking Biology News(10 mins):Drought and fire in the Amazon lead to sharp increases in forest tree mortality 2Drought and fire in the Amazon lead to sharp increases in forest tree mortality 3New technique detects microscopic diabetes-related eye damage 2New technique detects microscopic diabetes-related eye damage 3
(Date:1/15/2014)... Freeslate, Inc ., the leading ... Lupin Limited, one of India’s top five pharmaceutical companies, ... System for high throughput solid form screening. ... a wide range of quality, affordable generic and branded ...
(Date:1/14/2014)... 14, 2014 Histogen, Inc., a regenerative ... cells grown under simulated embryonic conditions, today announced that ... Suneva Medical, Inc. for physician-dispensed aesthetic products containing Histogen’s ... This agreement is an amendment to the existing license ...
(Date:1/14/2014)... SAN DIEGO and BETHESDA, Md. ... they are joining together with two institutes from the ... more reliable tools for bringing safer, more effective treatments ... with the National Center for Advancing Translational Sciences (NCATS) ...
(Date:1/14/2014)...   Kinaxis ®, provider of RapidResponse ®, a cloud-based ... planning ( S&OP ) service, is proud to be a ... be held at the Hilton San Diego Bayfront, January 30 ... Elisabeth Kaszas , Director of Supply Chain at Amgen, as ...
Breaking Biology Technology:Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3Histogen and Suneva Medical Expand License for Cell Conditioned Media-based Aesthetic Products Internationally 2Histogen and Suneva Medical Expand License for Cell Conditioned Media-based Aesthetic Products Internationally 3Organovo Announces Collaboration with National Institutes of Health 2Organovo Announces Collaboration with National Institutes of Health 3Event Alert: Kinaxis Customer to Present at the Biomanufacturing Summit "Supply Chain: Improving Network Effectiveness" 2
... Calif., Aug. 6 Telik, Inc. (Nasdaq: TELK ) today ... the second quarter ended June 30, 2009, compared with a net loss ... 2008. , , For the quarter ended June 30, ... million in the 2008 second quarter. Operating expenses in the 2009 ...
... , , EMERYVILLE, Calif., ... firm, added John E. Sealander, AIA, ACHA, NCARB, LEED(R) AP, ... Ratcliff ( http://www.ratcliffarch.com ) provides a ... and civic clients throughout the Western United States. , ...
... , , LOS ... $6 million to an 82 year-old Chinese female immigrant who suffered ... alleged that the Defendant, an osteopathic physician and registered pharmacist, prescribed ... alleged that she did not have gout. The doctor claimed ...
Cached Biology Technology:Telik Announces Second Quarter 2009 Financial Results 2Telik Announces Second Quarter 2009 Financial Results 3Telik Announces Second Quarter 2009 Financial Results 4Ratcliff Adds Architect John Sealander to Healthcare Practice Group 2The Law Offices of Brian D. Witzer Wins 6+ Million Dollar Verdict 2
a1-Antitrypsin (human, alpha-1 AT)...
... vesicles are used to study co-translational ... Processing events such as signal peptide ... glycosylation can be examined by the ... vitro in the presence of these ...
... using Mo Bio luciferase assay. Mo Bio Laboratories ... will allow you to certify your products ATP-Free ... you to deliver them to your customers in ... limit is 3.5 x 10-12 /l, which will ...
... New Concept in Microarrays: Biomedical Photometrics Inc. ... GmbH (Jena, Germany) have collaborated to develop ... ArrayTube System. The DNAscope AT is ... new DNAscope AT automatically reads up to ...
Biology Products: