HOME >> BIOLOGY >> NEWS
Changes in Australian ecosystems tied to arrival of exotic animals

A study of old and new emu eggshells collected from central Australia indicates a dramatic loss of grasslands beginning roughly 300 years ago was due to the arrival of Europeans and the introduction of exotic grazing animals, according to a new study.

The eggshells of the large, flightless bird are unique in that they can be dated by traditional radiocarbon methods and by a process known as amino acid racemization, said University of Colorado at Boulder Professor Gifford Miller. Racemization involves studying mirror-like changes in amino acids in the eggshells over time, which has proven to be an accurate time clock for dating events going back thousands of years.

"Because these eggshells can be dated by both radiocarbon methods and amino acids, they offer a unique opportunity to look back at ecosystem changes over the last 70,000 years," said Miller, a fellow of CU-Boulders Institute of Arctic and Alpine Research.

The study indicates that grazing mammals introduced in the last few centuries by Europeans have contributed to "a major change in ecosystems" in central Australia, said Miller. "We see a major reduction of plant biomass beginning in the 1800s, which looks like a result of overgrazing by pastoral animals and the introduction of rabbits."

The results of the study were presented at the fall 2000 meeting of the American Geophysical Union held in San Francisco Dec. 15 to Dec. 20. Other authors on the paper include Beverly Johnson, a former CU graduate student of Miller's now at the University of Washington, John Magee and Michael Gagan of Australian National University and Marilyn Fogel of the Carnegie Institution in Washington, D. C.

The eggshells were collected by Miller and Johnson, who conducted lengthy north-south and east-west transects in south-central Australia over the past two years. Miller believes the introduction of rabbits about 150 years ago was a major contributor to the demise of grasslands in the regio
'"/>

Contact: Gifford Miller
Gmiler@colorado.edu
303-492-6962
University of Colorado at Boulder
17-Dec-2000


Page: 1 2 3

Related biology news :

1. Changes to insect-seeking calls of horseshoe bats may drive new species formation
2. Changes in shape of single protein plays key role in the spread of cancer cells
3. Changes in arctic ice affect life around the globe
4. Changes in jet stream, storm tracks, linked to prairie drought patterns, study finds
5. Changes in prevalence of mutations associated with HIV treatment failure
6. Changes in rainfall patterns spur plant growth, carbon absorption across U.S.
7. Changes in agricultural practices help clean up Lake Erie
8. Changes in Lake Erie fish population suggest lakes recovery
9. Changes in North American land use have had major impact on global environment
10. Changes in diet related to prevalence of asthma and allergies
11. Changes for chickens? New hybrid corn helps reduce phosphorus in poultry litter, UD scientists report

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/3/2020)... ... ... Board-certified oral and maxillofacial surgeon, Dr. Michael Noffze offers experienced wisdom teeth ... Noffze can successfully extract problem and impacted wisdom teeth in teens and adults without ... oral and overall health of most patients as these extra teeth can cause many ...
(Date:3/2/2020)... ... , ... Rigaku Corporation is pleased to announce ... Spectroscopy ( Pittcon 2020 ), being held March 1 - 5, at McCormick ... on laboratory science, attracting attendees from industry, academia and government from over 90 ...
(Date:2/28/2020)... ... 27, 2020 , ... Regen Suppliers is now offering the top FDA Cleared ... products are not only one of the only FDA Cleared options available, there ... increasing exponentially in popularity, as they represent an excellent nonoperative method of reducing wrinkles ...
Breaking Biology News(10 mins):
(Date:3/19/2020)... ... March 17, 2020 , ... ... manufacturing collaboration agreement with pioneering gene circuit company Senti Biosciences, Inc. (Senti) ... cancer and other solid tumor indications. The collaboration will leverage RoosterBio’s human ...
(Date:3/10/2020)... ... ... Ortho Clinical Diagnostics, a global leader of in vitro diagnostics dedicated to improving ... of extended antigen in a gel testing format used for blood phenotyping for patients ... Max in the United States and Canada. The clearances allow testing for more than ...
(Date:3/4/2020)... ... ... This month, Cognosante will make its annual appearance at the HIMSS Global Health ... offerings that align with the HIMSS annual theme, “Be the Change.” , Cognosante’s ... From Interoperability and HIE to Cloud Computing and ...
(Date:2/28/2020)... , ... February 26, 2020 , ... ... combines a high-speed camera with a dedicated controller, thus simplifying setup, streamlining ... second, the HS7 is the first of Fastec Imaging’s new HS Series cameras ...
Breaking Biology Technology:
Cached News: