Methane emissions from extinct megafauna

@article{Smith2010MethaneEF,
  title={Methane emissions from extinct megafauna},
  author={Felisa A. Smith and Scott Elliott and S. Kathleen Lyons},
  journal={Nature Geoscience},
  year={2010},
  volume={3},
  pages={374-375}
}
To the Editor: About 13,400 years ago, the Americas were heavily populated with large-bodied herbivores such as mammoths, camelids and giant ground sloths; the megaherbivore assemblage was richer than in present-day Africa. However, by 11,500 years ago and within 1,000 years of the arrival of humans in the New World, 80% of these large-bodied mammals were extinct1. The eradication of megafauna had marked effects on terrestrial communities, including changes in vegetative structure and… 

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References

SHOWING 1-10 OF 15 REFERENCES
Ecological consequences of Late Quaternary extinctions of megafauna
  • C. Johnson
  • Biology, Medicine
    Proceedings of the Royal Society B: Biological Sciences
  • 2009
TLDR
Understanding the past role of giant herbivores provides fundamental insight into the history, dynamics and conservation of contemporary plant communities.
Methane production by domestic animals, wild ruminants, other herbivorous fauna, and humans
TLDR
Current CH 4 emission by domestic and wild animals is estimated to be about 78 Tg, representing 15-25% of the total CH 4 released to the atmosphere from all sources, and this source has increased by a factor of 4.4.
The Anthropogenic Greenhouse Era Began Thousands of Years Ago
The anthropogenic era is generally thought to have begun 150 to 200 years ago, when the industrial revolution began producing CO2 andCH4 at rates sufficient to alter their compositions in the
Changing boreal methane sources and constant biomass burning during the last termination
TLDR
An ice core record of carbon isotopic ratios in methane over the entire last glacial–interglacial transition shows that the carbon in atmospheric methane was isotopically much heavier in cold climate periods, and the atmospheric lifetime of methane is reduced duringcold climate periods.
Range Contractions of North American Carnivores and Ungulates
Abstract We compared the historic and current geographical ranges of 43 North American carnivores and ungulates to identify large-scale patterns in range contractions and expansions. Seventeen of the
Rapid Variations in Atmospheric Methane Concentration During the Past 110,000 Years
TLDR
A methane record from the GISP2 ice core reveals that millennial-scale variations in atmospheric methane concentration characterized much of the past 110,00 years, which suggests that insolation may have modulated the effects of interstadial climate change on the terrestrial biosphere.
Changing concentration, lifetime and climate forcing of atmospheric methane
Previous studies on ice core analyses and recent in situ measurements have shown that CH 4 has increased from about 0.75–1.73 μmol/mol during the past 150 years. Here, we review sources and sink
Mammal Population Losses and the Extinction Crisis
TLDR
Historic and present distributions of 173 declining mammal species from six continents are compared, finding that these species have collectively lost over 50% of their historic range area, mostly where human activities are intensive.
Constraining past global tropospheric methane budgets with carbon and hydrogen isotope ratios in ice
  • M. Whiticar, H. Schaefer
  • Physics, Medicine
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2007
TLDR
The first methane budgets for the late glacial period that are constrained by dual stable isotopes are presented and indicate that the Younger Dryas (YD) and Preindustrial Holocene have methane that is 13C- and 2H-enriched, relative to Modern.
LIFE HISTORY CHARACTERISTICS OF PLACENTAL NONVOLANT MAMMALS
The purpose of this data set was to compile general life history characteristics for a variety of mammalian species in order to perform comparative life history analyses among different taxa and
...
1
2
...