Publication Date:
2006-12-13
Description:
Because animals require oxygen, an increase in late-Neoproterozoic oxygen concentrations has been suggested as a stimulus for their evolution. The iron content of deep-sea sediments shows that the deep ocean was anoxic and ferruginous before and during the Gaskiers glaciation 580 million years ago and that it became oxic afterward. The first known members of the Ediacara biota arose shortly after the Gaskiers glaciation, suggesting a causal link between their evolution and this oxygenation event. A prolonged stable oxic environment may have permitted the emergence of bilateral motile animals some 25 million years later.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Canfield, Don E -- Poulton, Simon W -- Narbonne, Guy M -- New York, N.Y. -- Science. 2007 Jan 5;315(5808):92-5. Epub 2006 Dec 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Nordic Center for Earth Evolution (NordCEE) and Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark. dec@biology.sdu.dk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17158290" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Atmosphere
;
*Biological Evolution
;
*Fossils
;
Geologic Sediments/chemistry
;
Ice Cover
;
Iron/analysis
;
Newfoundland and Labrador
;
Oxidation-Reduction
;
Oxygen/*analysis
;
Seawater/*chemistry
;
Sulfates/analysis
;
Time
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
Permalink
