منابع مشابه
Pulsed oxidation and biological evolution in the Ediacaran Doushantuo Formation.
Recent geochemical data from Oman, Newfoundland, and the western United States suggest that long-term oxidation of Ediacaran oceans resulted in progressive depletion of a large dissolved organic carbon (DOC) reservoir and potentially triggered the radiation of acanthomorphic acritarchs, algae, macroscopic Ediacara organisms, and, subsequently, motile bilaterian animals. However, the hypothesize...
متن کاملEvolution: The Making of Ediacaran Giants
Some of the enigmatic Precambrian organisms in the Ediacaran Period grew large and stood tall above the seafloor. Canopy flow modeling suggests that their large size was optimized for access to flow in order to facilitate osmotrophic nutrient uptake in low-flow environments.
متن کاملOxidation of black carbon by biotic and abiotic processes
The objectives of this study were to assess the relative importance of either biotic or abiotic oxidation of biomassderived black carbon (BC) and to characterize the surface properties and charge characteristics of oxidized BC. We incubated BC and BC–soil mixtures at two temperatures (30 C and 70 C), with and without microbial inoculation, nutrient addition, or manure amendment for four months....
متن کاملBiotic Population Dynamics and the Theory of Evolution
We present a theory of evolution and empirical support from empirical studies and computer models of population dynamics. Analyzing published data, we found that changes in population size of lynx, muskrat, beaver, salmon, and fox display diversification, episodic changes in pattern, novelty, and evidence for nonrandom causation. These features characterize bios, as contrasted to random, period...
متن کاملThe biotic crisis and the future of evolution.
The biotic crisis overtaking our planet is likely to precipitate a major extinction of species. That much is well known. Not so well known but probably more significant in the long term is that the crisis will surely disrupt and deplete certain basic processes of evolution, with consequences likely to persist for millions of years. Distinctive features of future evolution could include a homoge...
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ژورنال
عنوان ژورنال: Nature
سال: 2007
ISSN: 0028-0836,1476-4687
DOI: 10.1038/nature06360