Navigation Links
Low oxygen likely made Great Dying worse, greatly delayed recovery

The biggest mass extinction in Earth history some 251 million years ago was preceded by elevated extinction rates before the main event and was followed by a delayed recovery that lasted for millions of years. New research by two University of Washington scientists suggests that a sharp decline in atmospheric oxygen levels was likely a major reason for both the elevated extinction rates and the very slow recovery.

Earth's land at the time was still massed in a supercontinent called Pangea, and most of the land above sea level became uninhabitable because low oxygen made breathing too difficult for most organisms to survive, said Raymond Huey, a UW biology professor.

What's more, in many cases nearby populations of the same species were cut off from each other because even low-altitude passes had insufficient oxygen to allow animals to cross from one valley to the next. That population fragmentation likely increased the extinction rate and slowed recovery following the mass extinction, Huey said.

"Biologists have previously thought about the physiological consequences of low oxygen levels during the late Permian period, but not about these biogeographical ones," he said.

Atmospheric oxygen content, about 21 percent today, was a very rich 30 percent in the early Permian period. However, previous carbon-cycle modeling by Robert Berner at Yale University has calculated that atmospheric oxygen began plummeting soon after, reaching about 16 percent at the end of the Permian and bottoming out at less than 12 percent about 10 million years into the Triassic period.

"Oxygen dropped from its highest level to its lowest level ever in only 20 million years, which is quite rapid, and animals that once were able to cross mountain passes quite easily suddenly had their movements severely restricted," Huey said.

He calculated that when the oxygen level hit 16 percent, breathing at sea level would have been like trying to breathe at the
'"/>

Source:UW News


Page: 1 2 3

Related biology news :

1. Why do insects stop breathing? To avoid damage from too much oxygen, say researchers
2. Hopkins researchers discover genetic switch that turns off an oxygen-poor cells combustion engine
3. Dont hold your breath: Carp can manage without oxygen for months
4. Heart has enough oxygen to survive hypothermia, CPR crucial
5. Steep oxygen decline halted first land colonization by Earths sea creatures
6. Technology for monitoring fetal oxygen during labor offers no apparent benefit
7. Giant insects might reign if only there was more oxygen in the air
8. Seals protect brain, conserve oxygen by turning off shivering response on icy dives
9. Genetically engineered blood protein can be used to split water into oxygen and hydrogen
10. Breathing easy: When it comes to oxygen, a bugs life is full of it
11. Need oxygen? Cells know how to spend and save
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Low oxygen likely made Great Dying worse greatly delayed recovery

(Date:7/11/2014)... of mesenchymal stem cells can stimulate neurogenesis in the ... disease (AD) and improve tissue and function injury under ... on the therapeutic effect of adipose-derived stem cells (ADSCs) ... on oxidative injury and neurogenesis in the brain of ... of Life Sciences, Tsinghua University, China transplanted ADSCs into ...
(Date:7/11/2014)... that cannabinoid receptor type 1 can inhibit ... and reduce neurotransmitter release. However, some scholars ... increase extracellular Ca2+ influx and increase neurotransmitter ... Tongji Hospital Affiliated to Tongji Medical College, ... used whole cell voltage-clamp and calcium imaging ...
(Date:7/11/2014)... of all vertebrates, information is transmitted through synapses, ... signal to be passed from one brain cell ... abundant type of synapse, can be either excitatory ... memory, perception and cognition, and the balance between ... For instance, every time we learn something, ...
Breaking Biology News(10 mins):Blame it on the astrocytes 2
... a study in her lab showed that mate (mah ... the activity of an enzyme that promotes HDL (good) ... scientist Elvira de Mejia headed for Argentina where mate ... She returned with a five-year agreement signed by ...
... rare Amur leopard (Panthera pardus orientalis), one of only ... captured and health-checked by experts from a consortium of ... group of organizations, including the Russian Academy of Sciences ... (WCS) and the Zoological Society of London (ZSL) captured ...
... more than 50 Earth Observation satellites is increasing ... synoptic views of our planet. Because these satellites ... analysis and environmental monitoring can be difficult, making ... Calibration and Validation processes. More than 50 ...
Cached Biology News:More on mate tea: lower cholesterol and an international agreement 2Critically endangered Amur leopard captured 2A roadmap for calibration and validation 2
(Date:7/13/2014)... 2014 Deep Research Report on Global and ... study on the current state of the Nano Silver ... a basic overview of the industry, including definitions, applications ... domestic market analysis are provided with a focus on ... A comparison between the international and Chinese situation is ...
(Date:7/11/2014)... WEST PALM BEACH, Fla. , July 11, 2014 ... wide variety of high-quality peptides that are used solely ... online. To honor two successful years in business, Maxim ... Performance LLC, has just launched a new and updated ... addition, the research blog section has been updated with ...
(Date:7/11/2014)... DUBLIN , July 11, 2014 ... "International Transfection Technology Market - Global Industry Analysis, ... report to their offering. ... to introduce nucleic acids (either DNA or RNA) into ... therapy, mutation of cancer cells and protein metabolism by ...
(Date:7/11/2014)... 2014 EPFL and the University of  ... of John P. Donoghue . The American neuroscientist ... . The new Wyss Center for ... Geneva , has named as its director ... P. Donoghue , founder of Brown University,s Institute for ...
Breaking Biology Technology:2014 Nano Silver Industry in Global and China Regions Development Proposals Analysis Available at DeepResearchReports.com 22014 Nano Silver Industry in Global and China Regions Development Proposals Analysis Available at DeepResearchReports.com 3Maxim Peptide Celebrates Second Anniversary Online with an Updated Website and Special Deals Section 2International Transfection Technology Market - Industry Analysis, Size, Share, Growth, Trends and Forecast to 2019 2John P. Donoghue is Taking the Lead at the Wyss Center and is Appointed Professor at EPFL and University of Geneva 2John P. Donoghue is Taking the Lead at the Wyss Center and is Appointed Professor at EPFL and University of Geneva 3
... 32 social scientists and researchers from around the world, ... have concluded that fundamental reforms of global environmental governance ... system. The scientists argued in the March 16 edition ... is now for a "constitutional moment" in world politics. ...
... 2012   Lexicon Pharmaceuticals, Inc. (Nasdaq: ... and Drug Administration (FDA) has granted its request for ... for the treatment of carcinoid syndrome.  Carcinoid syndrome is ... originate from the gastrointestinal tract and is characterized by ...
... 2012 AlphaVax, Inc. ("AVX") is pleased to report that it ... Industry Excellence Award as the Best Early-Stage Vaccine Biotech Company. The ... Washington, DC in April. AVX is pleased to ... the panel of judges as well as being recognized as a ...
Cached Biology Technology:Fundamental steps needed now in global redesign of Earth system governance 2Fundamental steps needed now in global redesign of Earth system governance 3FDA Grants Lexicon Orphan Drug Designation for Telotristat Etiprate for the Treatment of Carcinoid Syndrome 2FDA Grants Lexicon Orphan Drug Designation for Telotristat Etiprate for the Treatment of Carcinoid Syndrome 3FDA Grants Lexicon Orphan Drug Designation for Telotristat Etiprate for the Treatment of Carcinoid Syndrome 4
... The Rice Oligo Microarray, 22K ... of rice genes associated with biological ... abiotic stress response. Each microarray contains ... of the rice (japonica) genome focuses ...
... ELF 97 Cytological Labeling Kit provides a ... detection of cellular targets, including cell-surface receptors ... Labeling Kit contains the patented ELF 97 ... yellow-green precipitate at the site of enzymatic ...
... Ligands\n\nReceptor-related research has long been enabled by ... selected to keep pace with new discoveries. ... and services for receptor research and drug ... you do not find exactly what you ...
... Feature Extraction Software reads ... files to prepare microarray data ... , * one 2-year ... for NFP/Academic accounts , * ...
Biology Products: