Navigation Links
Ecologists receive mixed news from fossil record
Date:4/2/2010

Paleontologists can't always get what they want, to paraphrase the Rolling Stones, but sometimes they can get what they need, according to a study that will appear in the May issue of the American Naturalist.

The fossil record captures both the broad sweep of evolutionary changes in life on earth as well as ecological responses to shorter-term local and regional environmental shifts. And yet the amount of variability seen among successive fossil assemblages tends to be low compared to that ecologists see over shorter time periods. This suggests that communities are extremely resilient or resistant to change over decades to centuries.

In the American Naturalist article, University of Chicago paleontologists Adam Tomaovch and Susan Kidwell used data on living and fossil communities to explore where the low variability in fossil assemblages comes from. Does it come from the natural "time averaging" of skeletal remains that occurs during postmortem accumulation, or from biological processes actively maintaining a particular community composition?

Processes in the latter category include strong species preferences for particular niches that may enable them to avoid extinction owing to high growth rates at small population sizes, or the buffering of population growth during unfavorable times.

On most seafloors, lake bottoms and land surfaces, however, sediment accumulates quite slowly compared to the rates at which local animal populations generate skeletal remains. Multiple generations of skeletal remains may therefore become mixed within a single fossil assemblage. "Samples from a series of such time-averaged fossil assemblages are thus very different from the snapshots that come from repeatedly sampling a living community," said Tomaovch, a postdoctoral scientist in Geophysical Sciences at UChicago.

Simulating the effects of time-averaging on living communities from a Texas lagoon and an east African la
'/>"/>

Contact: Steve Koppes
s-koppes@uchicago.edu
773-702-8366
University of Chicago
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Ecologists discover city is uber-forest for big owls
2. Ecologists, material scientists pursue genetics of diatoms elegant, etched casing
3. Ecologists tease out private lives of plants and their pollinators
4. Biofuels and biodiversity dont mix, ecologists warn
5. Studies of small water fleas help ecologists understand population dynamics
6. Ecologists say metabolism accounts for why natural selection favors only some species
7. Ecologists use oceanographic data to predict future climate change
8. Ecologists report quantifiable measures of natures services to humans
9. Ecologists question effects of climate change on infectious diseases
10. The value of variation: Ecologists consider the causes and consequences
11. Ecologists discover forests are growing faster
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Ecologists receive mixed news from fossil record
(Date:9/1/2015)... MOUNTAIN VIEW, Calif. , Sept. 1, 2015 ... interaction with travelers during airport passenger screening. This ... which the passenger screening process will become unintrusive. ... and pre-clearance based on voluntary background investigations will ... analysis from Frost & Sullivan, Global Airport ...
(Date:8/31/2015)... 31, 2015 Growing need for ... government digitization projects to drive India ... TechSci Research report, " India Biometrics Market Forecast & Opportunities, ... is projected to grow at a CAGR of over 35% ... on account of extensive use of biometric technology in the ...
(Date:8/31/2015)... Research and Markets ( http://www.researchandmarkets.com/research/st5b3m/saudi_arabia ) has announced the ... - Growth, Trends & Forecasts (2014-2020)" report to ... Sensors market is estimated at $0.23 billion by 2018 ... The near future will bring biomedical sensors ... individual. These sensors can be set to trigger alerts ...
Breaking Biology News(10 mins):The Future of Airport Security: Passenger Screening Transitioning Into an Invisible Process 2The Future of Airport Security: Passenger Screening Transitioning Into an Invisible Process 3The Future of Airport Security: Passenger Screening Transitioning Into an Invisible Process 4India Biometrics Market to Grow at Over 35% Through 2020, Says TechSci Research 2India Biometrics Market to Grow at Over 35% Through 2020, Says TechSci Research 3Saudi Arabia Biomedical Sensors Market Report 2015 - Growth, Trends & Forecasts (2014-2020) 2
... 03, 2010, Seoul, S. Korea Institut Pasteur Korea ... the chemical compound collection of Novartis Institute for Tropical ... IP-K,s PhenomicScreen is a high-throughput, high-content visual screening ... Over the past year, PhenomicScreen has been used to ...
... Intense, individually tailored dietary treatment for acutely hospitalized elderly ... new study by researchers at Ben-Gurion University of the ... prestigious Journal of the American Geriatric Society ... percent) of the control group compared to the intervention ...
... Several of the most promising technological research projects at ... infusion of federal cash to help them through the ... the commercial market. With $5.1 million in federal ... System of Maryland research institutions and the U.S. Army ...
Cached Biology News:Personalized diets for elderly after hospitalization decreases mortality rates 2$5.1 million Army-Md. alliance speeds university research to market 2$5.1 million Army-Md. alliance speeds university research to market 3$5.1 million Army-Md. alliance speeds university research to market 4$5.1 million Army-Md. alliance speeds university research to market 5
(Date:9/1/2015)... DUBLIN , September 1, 2015 ... appointment of Sara Mathew to its Board of ... member of the Audit, Compliance & Risk Committee of the ... 1, 2015. Sara previously served as Chairman, President ... retiring in December 2013. During her 12-year tenure at D&B, ...
(Date:8/31/2015)... 31, 2015 MabVax Therapeutics Holdings, Inc. (OTCQB: ... the Company,s lead antibody, HuMab 5B1, will be garnering ... during the upcoming World Molecular Imaging Congress (WMIC) being ... 2015. Researchers from the Department of Radiology at Memorial ... the use of MabVax,s lead antibody as a PET ...
(Date:8/31/2015)... -- Research and Markets ( http://www.researchandmarkets.com/research/cbgl72/middle_east_and ) has announced ... Biomedical Sensors Market - Growth, Trends & Forecasts (2014-2020)" ... Middle East & Africa Biomedical ... at a CAGR of 3.26% over the period 2014-2020 ... that are adaptable to the genetic formulation of each ...
(Date:8/31/2015)... , Aug. 31, 2015  US-Australian drug discovery ... ) today confirmed its comprehensive scientific review has ... platforms in areas of unmet patient need. Novogen ... remaining preclinical projects prior to entering into Phase ... Acting Chief Executive Officer, Iain ...
Breaking Biology Technology:Shire Appoints Sara Mathew to Board of Directors 2MabVax Therapeutics HuMab 5B1 Antibody Is Highlighted at Upcoming World Molecular Imaging Congress in Five Separate Presentations 2MabVax Therapeutics HuMab 5B1 Antibody Is Highlighted at Upcoming World Molecular Imaging Congress in Five Separate Presentations 3MabVax Therapeutics HuMab 5B1 Antibody Is Highlighted at Upcoming World Molecular Imaging Congress in Five Separate Presentations 4Middle East & Africa Biomedical Sensors Market Report 2015 - Growth, Trends & Forecasts to 2020 2Novogen Announces The Outcome Of A Comprehensive Science Review 2Novogen Announces The Outcome Of A Comprehensive Science Review 3Novogen Announces The Outcome Of A Comprehensive Science Review 4Novogen Announces The Outcome Of A Comprehensive Science Review 5Novogen Announces The Outcome Of A Comprehensive Science Review 6
... Inc.,(Nasdaq: RDEA ) announced today that Barry D. Quart, PharmD, ... UBS Global Life Sciences Conference, Date: ... Time Location: Grand Hyatt, New York ... Focus Conference, Date: Tuesday, October 7, 2008 ...
... Serve Growing Highly-Potent and Cytotoxic ... ... Pharmatek -- a,pharmaceutical chemistry development organization supporting the,pharmaceutical industry -- ... in San Diego., The 18,000 sq. ft. facility includes ...
... the use of sensors or barcodes at the nanoscale, North ... tiny organic particles, when heated to the proper temperature, bob ... film and then can reversibly recede below the surface when ... of particles to a surface and then sinking them back ...
Cached Biology Technology:Ardea Biosciences to Present at the UBS Global Life Sciences Conference and the Third Annual JMP Securities Healthcare Focus Conference 2Pharmatek Announces Official Opening of New Highly-Potent & Cytotoxic Development and Manufacturing Facility 2NC State engineers discover nanoparticles can break on through 2
... Genetic Analysis System, which processes two 96-well plates ... adds a higher level of throughput to the ... of Beckman Coulters new GenomeLab family of products*, ... Biomek series liquid handers, for increased automation. ...
... Library Panels were designed for full-length gene ... PCRs to identify the desired cDNA clone. ... a 96-well "Master Plate," where each well ... identified the positive well(s) by gel electrophoresis ...
... Pathway Studio Enterprise is integrated informatics ... regulatory mechanisms and drug response modeling. ... the worlds largest knowledge base of ... with MedScan module capable of extracting ...
Application: For use as a carrier in nucleic acid purification and precipitation. Physical form: Solution in 10 mM Tris HCl, pH 7.4, 1 mM EDTA Concentration: 9-11 mg/mL Physical Form: buffered aqu...
Biology Products: