HOME >> BIOLOGY >> NEWS
Fossil records show biodiversity comes and goes

n taxonomy, because genera classifications are more manageable and less often revised than species classifications; and includes only marine fossils because the records are longer and better preserved than records of land fossils.

For their study, Muller and Rohde defined fossil diversity as the number of distinct genera alive at any given time. This yielded a total of 36,380 genera, whose history the Berkeley scientists tracked over time, using the International Commission on Stratigraphy's 2004 time scale.

"Putting the timescale in a chronologic format was critical to our findings, because there were no specific years assigned to the geologic timescale used by Sepkoski," Muller said. "We are the first to reconstruct diversity from the final version of Sepkoski's Compendium, and the first to use the 2004 geochronology time scale. In a sense, our work has verified the new time scale."

Muller and Rohde have been working on this study for nearly two years, and first discovered the 62 million year biodiversity cycle in November, 2003. They spent the next year trying to either knock it down or explain it. Despite examining 14 possible geophysical and astronomical causes of the cycles, no clear explanation emerged. Muller and Rohde each has his own favorite guess.

Muller suspects there is an astrophysical driving mechanism behind the 62 million year periodicity.

"Comets could be perturbed from the Oort cloud by the periodic passage of the solar system through molecular clouds, Galactic arms, or some other structure with strong gravitational influence," Muller said. "But there is no evidence even suggesting that such a structure exists."

Rohde prefers a geophysical driver, possibly massive volcanic eruptions triggered by the rise of plumes to the earth's surface. Plumes are upwellings of hot material from near the earth's core that some scientists believe have the potential to reoccur on a periodic basis.


'"/>

Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
14-Mar-2005


Page: 1 2 3

Related biology news :

1. Fossil DNA illuminates life
2. Fossil discovery marks earliest record of limbloss in ancient lizard
3. Fossils of ancient sea monster found in Montana
4. Fossil is missing link in elephant lineage
5. Fossilized liquid assembly: Nanomaterials research tool
6. Fossils pinpoint tropics as Earths most fruitful biodiversity spawning ground
7. Early bird caught the fish: Fossils depict aquatic origins of birds 115 million years ago
8. Fossil wood gives vital clues to ancient climates
9. Fossils tell the hole story of killer drillers and their prey
10. Fossil Patagonian plants show high insect feeding diversity 52 million years ago
11. UC researchers shatter world records with length of latest carbon nanotube arrays

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


(Date:1/22/2020)... (PRWEB) , ... January 21, 2020 , ... ... Pozil to lead the company’s new Business Development Department. The move, which is ... Pozil had been previously serving as the company’s Senior Vice President where he ...
(Date:1/10/2020)... , ... January 09, 2020 , ... ... bioactive spinal solutions, today announced the 510(K) clearance and commercial launch of the ... interbody fusion system. , The EVOL®ha-DLIF is made of PEEK-OPTIMA HA Enhanced ...
(Date:1/7/2020)... ... January 06, 2020 , ... Myant Inc. , the ... Las Vegas) to bring to life its vision of a world where textile-based interfaces ... community, the AI-powered digital sphere, and the physical IoT-enabled environment. The experience at Myant’s ...
Breaking Biology News(10 mins):
(Date:1/28/2020)... ... January 28, 2020 , ... Lifecycle Biotechnologies announced ... beverage manufactures within North America. Both Lifecycle and Midland have supported this industry ... company to pool their collective resources and provide the industry with support, service, ...
(Date:1/24/2020)... ... , ... The plastic and reconstructive surgeons at The Institute for Advanced ... that plastic surgery is much more than just cosmetic surgery and far more extensive ... 20 years NJ Top Docs, Dr. Andrew Elkwood, Dr. Michael Rose, Dr. Matthew Kaufman, ...
(Date:1/22/2020)... (PRWEB) , ... January 21, 2020 , ... ... hiring of Darrell Taylor as Southern Midwest Region Industrial and Institutional (I&I) Account ... SporActiv™ product line. , Darrell brings over 30 years of sales ...
(Date:1/10/2020)... PISCATAWAY, N.J. (PRWEB) , ... January 09, 2020 ... ... companies in China, today announced its inaugural GenScript Biotech Global Forum on Jan. ... Forum, exploring the theme "Cell and Gene Therapy and the Booming China Market," ...
Breaking Biology Technology:
Cached News: