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Related post: Author of The Lucifer Principle: A Scientific Expedition Into the Forces of
History and Global Brain: The Evolution of Mass Mind From The Big Bang to the
21st Century
Recent Visiting Scholar-Graduate Psychology Department, New York University;
Core Faculty Member, The Graduate Institute
www.howardbloom.net
www.bigbangtango.net
Founder: International Paleopsychology Project; founding board member: Epic
of Evolution Society; founding board member, Buy Methoxsalen The Darwin Project; founder: The
Big Bang Tango Media Lab; member: New York Academy of Sciences, American
Association for the Advancement of Science, American Psychological Society,
Academy of Political Science, Human Behavior and Evolution Society, International
Society for Human Ethology; advisory board member: Institute for
Accelerating Change ; executive editor -- New Paradigm book series.
For information on The International Paleopsychology Project, see:
www.paleopsych.org
for two chapters from
The Lucifer Principle: A Scientific Expedition Into the Forces of History,
see www.howardbloom.net/lucifer
For information on Global Brain: The Evolution of Mass Mind from the Big
Bang to the 21st Century, see www.howardbloom.net
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From checker at panix.com Wed Aug 3 22:58:47 2005
From: checker at panix.com (Premise Checker)
Date: Wed, 3 Aug 2005 18:58:47 -0400 (EDT)
Subject: [Paleopsych] SW: On Human Impacts on Ecosystems
Message-ID:
Anthropology: On Human Impacts on Ecosystems
http://scienceweek.com/2005/sw050805-3.htm
[I left out several addresses in recent e-mails. Let me know what dates you
missed if you want to get these articles.]
The following points are made by Christopher N. Johnson (Science 2005
309:255):
1) What was the impact of early human populations on pristine
ecosystems? Studies of this question have focused on the possibility
that humans caused extinctions of large mammals. For example, the
arrival of modern humans in the Americas ~11,000 years ago coincided
with the disappearance of mammoths, ground sloths, and many other
large mammals [1]. However, the role Methoxsalen Price of humans is difficult to
determine in this case because the climate was also changing rapidly
as the last ice age came to an end; climate change, not human impact,
may have caused the extinctions.
2) Modern humans reached Australia much earlier. Just when Methoxsalen Tablets they did is
still debated, but occupation was widespread by 45,000 years ago and
may have begun several thousand years earlier [2] -- well before the
climatic upheavals at the end of the last glacial cycle. Australia
should therefore provide a clear view of the ecological impacts of
human arrival. But environmental changes following human arrival in
Australia have been difficult to resolve, because very few precisely
dated environmental records extend through the middle of the last
glacial cycle. Recent Methoxsalen Vitiligo work. (3) provides such a record based on diet
reconstructions of the continent's two largest bird species. The
results indicate that human arrival resulted in a profound
environmental shift.
3) Miller et al [3] studied past diets of the emu (Dromaius
novaehollandiae) and an even larger flightless herbivorous bird, the
extinct Genyornis newtoni, in the arid and semi-arid regions of the
south Australian interior. By analyzing carbon isotopes in
individually dated eggshells, they were able to compare the
contributions of plants that use the C4 photosynthetic pathway (mainly
tropical and arid-adapted grasses) and those that use the C3 pathway
(most shrubs, trees, and nongrass herbs) to the diet of the birds that
laid the eggs. Their collection of eggshells covers Methoxsalen Lotion the past 140,000
years, encompassing the whole of the last glacial cycle.
4) Miller et al [3] found a sudden change in emu diet between 50,000
and 45,000 years ago. Before 50,000 years ago, emus had variable
diets, with a strong contribution from C4 plants; after 45,000 years
ago, they ate mostly C3 plants. Genyornis eggshells were common before
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