Eutrophication, microbial-sulfate reduction and mass extinctions
نویسندگان
چکیده
منابع مشابه
Eutrophication, microbial-sulfate reduction and mass extinctions
In post-Cambrian time, life on Earth experienced 5 major extinction events, likely instigated by adverse environmental conditions. Biodiversity loss among marine taxa, for at least 3 of these mass extinction events (Late Devonian, end-Permian and end-Triassic), has been connected with widespread oxygen-depleted and sulfide-bearing marine water. Furthermore, geochemical and sedimentary evidence ...
متن کاملThe antiquity of microbial sulfate reduction
The phylogenetic positions of sulfate-reducing organisms, as revealed from comparisons of small-subunit ribosomal RNA (SSU rRNA), are spread over both the Archaeal and Bacterial domains, though when they evolved is uncertain. The lowbranching positions of some of these groups on the Tree of Life have inspired the hypothesis that the metabolic innovation of microbial sulfate reduction is of grea...
متن کاملMass extinctions
Factors influencing the evolution of complex traits such as body size are notoriously difficult to study but a new review of work on marine iguanas in the Galapagos islands suggests an answer may lie in the interplay of natural and sexual selection.
متن کاملMass extinctions and macroevolution
—Mass extinctions are important to macroevolution not only because they involve a sharp increase in extinction intensity over ‘‘background’’ levels, but also because they bring a change in extinction selectivity, and these quantitative and qualitative shifts set the stage for evolutionary recoveries. The set of extinction intensities for all stratigraphic stages appears to fall into a single ri...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Communicative & Integrative Biology
سال: 2015
ISSN: 1942-0889
DOI: 10.1080/19420889.2015.1115162