HOME >> BIOLOGY >> NEWS
Fossilized Emu Eggshells Give Clues To 65,000 Years Of Vegetation And Climate Changes In Australia

winter.

Between 28,000 and 15,000 years ago, during the peak of the last glacial period, C4 grasses were almost totally absent because of the colder temperatures. Their range should have expanded again when the Earth warmed during the Holocene (10,000 years ago). However, data from the emu eggshell documents that the ecosystem did not revert to its state that prevailed prior to the arrival of humans. C4 grass abundances were below the levels established before the glacial period. Over the last 65,000 years, the researchers conclude, environmental factors other than climate have significantly influenced Australian ecology.

Vegetation changes in north- and south-eastern Australia, brought about by more frequent fires, is attributed to the arrival of the first human immigrants at about 60,000 years ago. The transfer of moisture from the plants and soils to the atmosphere is an important feedback mechanism that enhances the transfer of monsoon rainfall into the interior of the continent. Changes in the types of plants across northern Australia, brought about by the burning practices of the first human colonizers, may have reduced this mechanism and thus diminished the amount of rainfall reaching what is now the arid Australian interior. The influence of humans with their recurrent fires has been suggested as the cause of extinction for a least one Australian megafauna, the flightless bird Genyornis newtoni at 50,000 years ago (Science, vol. 283, no. 5399, p. 182).

Measurements since European colonization (about 150 years ago) indicate a further depletion of the C4 grasses. Instead of being related to climate, the shift is believed to result from overgrazing, the introduction of exotics and other activities associated with human expansion.

According to Marilyn Fogel, "Our isotopic data on the emu's eggshells are consistent with a human overprint on natural climate changes. The effect of precipitation from the summer monsoon in central Australia decrease
'"/>

Contact: Marylin Fogel
Fogel@gl.ciw.edu
202 686-2410 x 2480
Carnegie Institution
14-May-1999


Page: 1 2 3

Related biology news :

1. Scientists Use Fossilized Emu Eggshells To Discern Changes In Vegetation, Provide Additional Evidence Of Human Impact On Australian Landscape
2. Fossil Eggshells Hold Clues To Major Animal Extinctions As Reported In Science
3. How wounds heal Clues from flies
4. Shadow proteins in thymus - Clues to how immune system works?
5. Clues to the evolution of photosynthesis
6. Clues from analysis of fish bones supports theory of climate shift 5000 years ago, onset of El Nio
7. Clues to development of eyes light-sensitive cells found
8. Ant-Fungus Relationship May Provide New Clues About Antibiotics
9. Jumpin Jordan! Athletic Gene Yields Biological Clues
10. Structure Of Fat-Depleting Protein Reveals Important Functional Clues
11. Model Polymers Reveal New Clues to Protein Folding

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


(Date:8/26/2020)... SAN DIEGO and SHANGHAI (PRWEB) , ... August ... ... company pursuing novel approaches for the treatment of chronic inflammatory and fibrotic diseases, ... Operating Officer and Vice President of Drug Discovery. , Dr. Canan previously served ...
(Date:8/21/2020)... ... August 18, 2020 , ... Sentien ... announced that the U.S. Food and Drug Administration (FDA) has approved the company’s ... for the treatment of severe COVID-19. Approval of this IND allows Sentien to ...
(Date:8/12/2020)... ... , ... Mosio recently announced its newly updated text message-based ... all sizes. With a focus on tracking symptoms and monitoring outbreaks as well ... helps public health departments automate communications and provide more personalized care and resources ...
Breaking Biology News(10 mins):
(Date:8/12/2020)... ... 2020 , ... The FSHD Society announced today that it ... Trial Research Network (FSHD CTRN), with consideration of follow-on funding of $300,000 ... research centers in the United States and Europe with expertise in FSHD clinical ...
(Date:8/12/2020)... BINGHAM FARMS, Mich. (PRWEB) , ... August 12, ... ... International Consulting Group, Inc. (EMMA International), a global leader in FDA compliance ... ranking of the nation’s fastest-growing private companies. The list represents a unique look ...
(Date:8/3/2020)... ... August 03, 2020 , ... ERT, ... and CEO has been named one of the 100 most inspiring individuals in ... 100 honorees are selected based on how they have inspired their colleagues and ...
(Date:7/31/2020)... ... July 29, 2020 , ... R3 Stem Cell International is now ... With 50 million stem cells total, patients may choose which extremities they would like ... arthritic joints (BMC Musculoskelet Disord. 2016). At R3 International, umbilical cord tissue is obtained ...
Breaking Biology Technology:
Cached News: