Navigation Links
Low level of extinction during ice age linked to adaptability

dant and well-fossilized during the Paleozoic. He constructed a database that charted latitudinal patterns of evolution and extinction through the late Paleozoic.

"This database is the first ever; no other database of this kind exists for any interval of geologic time, from which to study geographic patterns of macroevolution," Powell said.

According to Powell's analysis, brachiopods that lived primarily near the equator suffered the highest extinction rates and did not re-appear in great numbers until the ice age ended.

"The absence of these particular brachiopods during the ice age left the oceans populated almost entirely with those who lived over a wider geographic area," Powell said. "What I found is that the uniquely low global rates of evolution and extinction for brachiopods during the late Paleozoic ice age were caused by the loss and lack of recovery of those that had existed in narrow latitudinal ranges."

Powell believes that those brachiopods that existed within narrow latitudinal ranges became victims of the extremes in the annual minimum and maximum temperatures that were typical of the late Paleozoic. During that era, "seasonality" -- the difference between annual temperatures' highs and lows -- was amplified by the presence of glaciers.

"I've suggested that those brachiopods which eventually became extinct had adapted only to small temperature changes, and thus did not survive," he said. "The other competing hypothesis is that large fluctuations of sea level, driven by the melting and reforming of glaciers, disrupted marine communities, and the ones which survived were those able to adjust.


'"/>

Source:Johns Hopkins University


Page: 1 2

Related biology news :

1. Unprecedented water level rise in Somalia
2. New lab technique identifies high levels of pathogens in therapy pool
3. Findings have implications for tracking disease, drugs at the molecular level
4. At the molecular level, the predator is the prey
5. Scientists at Galileo Pharmaceuticals confirm inflammatory response linked to glucose levels
6. MERIS monitoring tracks planetary photosynthesis levels
7. ‘Blue Brain?project explores thought at molecular level
8. Scientists find evidence of catastrophic sand avalanches, sea level changes in Gulf of Mexico
9. High carbon dioxide levels spur Southern pines to grow more needles
10. Enzyme affects hypertension by controlling salt levels in body
11. Field tested: Grasslands wont help buffer climate change as carbon dioxide levels rise
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Low level extinction during ice age linked adaptability

(Date:8/10/2015)... August 10, 2015 The latest 364 ... comprehensive analysis of the global border security market . ... of $16.4bn in 2015. Now: Border security is ... example of the business critical issue you need to know ... visiongain ,s objective analysis of how this will impact your ...
(Date:8/5/2015)... According to a new market ... Services, Vertical (BFSI, Airport, IT & Telecom, Utilities, Education, ... to 2020", published by MarketsandMarkets, defines and segments the ... segments. The global PIAM Market is estimated to grow ... 2019, at a CAGR of 14.9 % from 2014 ...
(Date:8/4/2015)... -- AMRI (NASDAQ: AMRI ) today reported financial and operating results ... , Second quarter contract revenue of $ 85.2 ... Adjusted contract margins of 26 % , ... decrease in EPS from royalties in the current quarter ... "We are very pleased to present another strong financial quarter, with ...
Breaking Biology News(10 mins):Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 2Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 3Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 4Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 5Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 6Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 7Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 8Border Security Market Report 2015-2025 - Growth in Biometrics, ICT, Manned and Unmanned Vehicles, and Perimeter Surveillance 9Physical Identity and Access Management Market Worth $546.2 Million by 2019 2Physical Identity and Access Management Market Worth $546.2 Million by 2019 3Physical Identity and Access Management Market Worth $546.2 Million by 2019 4AMRI Announces Second Quarter 2015 Results 2AMRI Announces Second Quarter 2015 Results 3AMRI Announces Second Quarter 2015 Results 4AMRI Announces Second Quarter 2015 Results 5AMRI Announces Second Quarter 2015 Results 6AMRI Announces Second Quarter 2015 Results 7AMRI Announces Second Quarter 2015 Results 8AMRI Announces Second Quarter 2015 Results 9AMRI Announces Second Quarter 2015 Results 10AMRI Announces Second Quarter 2015 Results 11AMRI Announces Second Quarter 2015 Results 12AMRI Announces Second Quarter 2015 Results 13AMRI Announces Second Quarter 2015 Results 14AMRI Announces Second Quarter 2015 Results 15AMRI Announces Second Quarter 2015 Results 16AMRI Announces Second Quarter 2015 Results 17AMRI Announces Second Quarter 2015 Results 18AMRI Announces Second Quarter 2015 Results 19AMRI Announces Second Quarter 2015 Results 20AMRI Announces Second Quarter 2015 Results 21AMRI Announces Second Quarter 2015 Results 22AMRI Announces Second Quarter 2015 Results 23AMRI Announces Second Quarter 2015 Results 24
... By mid-century, people may be fleeing rising ... migrations that could vastly exceed the scope of anything before, ... at Columbia University,s Center for International Earth Science Information Network ... today at a news conference in Bonn. , ...
... Darwin observed, natural selection leading to adaptation of individuals ... But over very long spans of time, the major ... ways organisms develop arose as outcomes of history-dependent variation ... of organisms. For example, most cats look like cats, ...
... dioxins during pregnancy harms the cells in rapidly-changing breast ... breastfeeding or don,t produce enough milk, according to a ... their findings, although only demonstrated in mice at this ... impacts millions of women but has received little attention ...
Cached Biology News:Climate change could drive vast human migrations 2Climate change could drive vast human migrations 3Work of Field Museum scientist addresses question of chance in evolution 2Dioxins in food chain linked to breastfeeding ills 2Dioxins in food chain linked to breastfeeding ills 3
(Date:8/27/2015)... , Aug. 27, 2015 /PRNewswire/ - Portage Biotech ... PBT.U), and Biohaven Pharmaceutical Holding Company Limited (Biohaven), ... Phase I study of BHV-0223, a glutamate modulating ... regarding BHV-0223 and recently obtained clearance from the ... with human testing. Portage holds 54% equity interest ...
(Date:8/27/2015)... , August 27, 2015 GlassesOff ... image processing functions in the human vision system, announced today ... point guard Chris Paul to develop a ... who want to improve their real-life on-court performance. ... court, whether it is shooting a ball or blocking a ...
(Date:8/26/2015)... ... August 26, 2015 , ... ... today that a second US laboratory is to open in Manhattan, Kansas in ... continued partnership and long-term growth of research and development through collaboration with researchers ...
(Date:8/26/2015)...  Platform therapeutic company Symic Biomedical, Inc. ("Symic") ... Phase II SBIR grant from the National Institutes ... agent to reduce arteriovenous fistula (AVF) failures, a ... disease (ESRD) patients undergoing hemodialysis. The two-year project, ... Digestive and Kidney Diseases (NIDDK), will allow Symic ...
Breaking Biology Technology:Portage's Biohaven doses first human subject in Phase 1 trial with lead drug candidate BHV-0223 2Portage's Biohaven doses first human subject in Phase 1 trial with lead drug candidate BHV-0223 3Portage's Biohaven doses first human subject in Phase 1 trial with lead drug candidate BHV-0223 4Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 2Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 3MediVet Biologics Animal Health Secures Additional Laboratory Facility in Manhattan, Kansas 2MediVet Biologics Animal Health Secures Additional Laboratory Facility in Manhattan, Kansas 3Symic Biomedical Awarded $1.5MM NIH Phase II SBIR Grant to Develop its Proteoglycan Mimetic Therapeutics to Reduce Vascular Access Failures in ESRD 2Symic Biomedical Awarded $1.5MM NIH Phase II SBIR Grant to Develop its Proteoglycan Mimetic Therapeutics to Reduce Vascular Access Failures in ESRD 3
... -- PARIS, August 13, 2010 ... ... var shortURL = ""; BitlyCB.alertResponse = function(data) ... grab the first one. for (var r in data.results) { first_result = data.results[r]; break; } for (var ...
... A University of Oklahoma professor has been selected as a ... for contributions in chemistry in either academia, government or industry. ... and Biochemistry, will be honored during a special ceremony at ... The 2010 Class of Fellows is only the second group ...
... international team of scientists and industrialists is to meet at ... technique for harnessing green energy. Norwegian company EnSol AS ... technology which they seek to develop commercially by 2016. ... of Leicester Department of Physics and Astronomy to develop the ...
Cached Biology Technology:FDA Grants Approval of ella(R) for Emergency Contraception 2FDA Grants Approval of ella(R) for Emergency Contraception 3FDA Grants Approval of ella(R) for Emergency Contraception 4FDA Grants Approval of ella(R) for Emergency Contraception 5FDA Grants Approval of ella(R) for Emergency Contraception 6FDA Grants Approval of ella(R) for Emergency Contraception 7New technique announced to turn windows into power generators 2
... LiCl precipitation offers major advantages over other ... precipitate DNA, protein or carbohydrates. It is the ... or cDNA synthesis from RNA preparations. Note, LiCl ... total RNA isolations. If the RNA is to ...
...
...
The Captivate Disposable Sample Chamber is designed for use with the Captivate magnetic yoke assembly (C-24700) and can be used with our Captivate ferrofluid conjugates (C-21473 C-21474 C-21476) or ...
Biology Products: