HOME >> BIOLOGY >> NEWS
University Of Cincinnati Geologists Analyzes Evolutionary Impact Of Mass Extinctions

The dramatic effects of the mass extinctions recorded in Earth's geologic record have led many geologists to view them as a distinct class of events -- so powerful that they swamp out normal evolutionary processes. Others have argued the opposite, that over geologic time, mass extinctions have had little effect on global diversity trends.

University of Cincinnati geologist Arnold Miller argues in a review paper in the August 21 issue of Science that the truth is somewhere in the middle of those extreme views. Miller's evaluation of global marine diversity patterns through the Phanerozoic, in light of recent research, indicates that mass extinctions are simply the most globally extensive of a continuum of abrupt transitions that combine to affect overall global diversity. The Phanerozoic covers the pasts 540 million years.

That view is in contrast to Stephen Jay Gould and others who have viewed mass extinctions as an over-arching tier of evolutionary processes, distinctly different than the processes which occur in the intervening time periods.

"While I agree that mass extinctions are the largest and most important of a class of 'catastrophes,' I would argue that they are not fundamentally different as an evolutionary mechanism from what causes diversity change in the intervals between them," said Miller.

"The so-called background intervals are also built of catastrophes that are more local or regional in scope, but can have the same profound effect on a local biota that a mass extinction has on a global biota."

As an example of an abrupt regional change, Miller discusses the diversification of a group of organisms known as "biological bulldozers," which dig into deposited sediments to find food.

The geologic record includes cases where the bulldozers replaced another group known as ISOSS (immobile suspension feeders on soft substrates). Previously, researchers believed the biological bulldozers out-competed the ISOSS organisms. Miller sugg
'"/>

Contact: Arnold Miller
arnold.miller@uc.edu
(513) 556-4022
University of Cincinnati
20-Aug-1998


Page: 1 2

Related biology news :

1. Indiana University, EPA to study airborne PCBs
2. University of Alberta researcher looks for clues to mysterious disease
3. Northeastern University receives $12.4 million NSF grant for creation of nanomanufacturing institute
4. Washington University in St. Louis leads group studying aging process
5. Tufts University establishes $4 million dollar tissue engineering resource center
6. Case for IBD combination therapy comes from research at Baylor, MIT and Hebrew University
7. As informatics grows, Indiana University helps set research agenda
8. University of Arizona licenses patent for natural fungicide
9. Washington University in St. Louis plays key role in sequencing moss genome
10. University of Pittsburgh receives $10 million grant for head and neck cancer
11. Clemson University spin-off uses corn to make plastics, provide cleaner air

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


(Date:6/28/2020)... BASEL, Switzerland (PRWEB) , ... ... ... leading provider of enterprise software solutions for biopharmaceutical R&D, today announced that ... oncology company developing innovative, full-length multispecific antibodies (Multiclonics®), to support their translational ...
(Date:6/25/2020)... MANSFIELD, Mass. (PRWEB) , ... June 24, 2020 ... ... provider of cloud-based enterprise software and software-driven clinical data services that accelerate drug ... trials for low-dose selinexor, an XPO1 inhibitor, in hospitalized patients with severe COVID-19. ...
(Date:6/23/2020)... , ... June 23, 2020 , ... ... sustainable healthcare, and Renovagen Ltd, a UK supplier and manufacturer of innovative portable ... support testing operations in the fight against the COVID-19 pandemic in Zambia. , ...
Breaking Biology News(10 mins):
(Date:7/22/2020)... ... ... Join experts from Reed Tech , Gary Saner, Sr. Manager, Information ... live webinar on Thursday, August 13, 2020 at 11am EDT (4pm BST/UK). ... Specifically, for medical devices, the NMPA has departments dealing with medical device registration (pre-market ...
(Date:7/10/2020)... ... July 08, 2020 , ... ... products, announces a significant expansion of laboratory operations through its COVID-19 testing ... implementing testing programs. , Bode-CARES provides a turnkey solution that ...
(Date:7/7/2020)... ... July 06, 2020 , ... Bio-IT World ... Eli Lilly, Bristol-Myers Squibb, the University of Chicago, Massachusetts General Hospital, Mission: Cure, ... an elite awards program, highlighting outstanding examples of how technology innovations and strategic ...
(Date:6/28/2020)... ... June 25, 2020 , ... ... develop a vaccine or drug treatment. In an effort to better understand the ... released the world’s largest imaging dataset portraying therapeutic compound effects from over 1,600 ...
Breaking Biology Technology:
Cached News: