2012 Feb 3. Rebuilding Wetlands by Managing the Muddy Mississippi. By Carolyn Gramling, Science (subscription needed). Coastal managers and scientists have struggled to find ways to restore water flow through the wetlands of the Mississippi delta and bring back the sediment, supply of which has been cut in half by humanmade river channels, levees, and dams intended to control the river and save coastal communities from flooding. The U.S. Army Corps of Engineers opened the Morganza spillway during the 2011 Mississippi River floods to divert floodwaters, which offered a rare opportunity to conduct a large-scale natural experiment in real time. The floodwaters did carry enough sediment to help rebuild the wetlands, but that material didn't always stay where it could do the most good. However, researchers gained valuable insights—including ideas about how spillway design can help produce more targeted sediment deposits, and what volume of flow through the spillways might be required for effective wetland rebuilding.
2011 April 24. Spring may Lose Song of Cuckoos, Nightingales and Turtle Doves. By Robin McKie, The Observer. Excerpt:
Some of Britain's most cherished spring visitors are disappearing in
their thousands. Ornithologists say species such as the cuckoo,
nightingale and turtle dove are undergoing catastrophic drops in
numbers , although experts are puzzled about the exact reasons for
these declines.…The call of the cuckoo could be silenced in the near
future unless scientists can unravel the causes of the drastic decline
in their population. ..."The real problem is that there are so many
different possible causes for these losses .... "These losses could be
the result of changes in farmland use in Britain which are affecting
the way these birds breed when they arrive here in spring. Or they
could be due to the spread of human populations in Africa and the
destruction of natural habitats where they make their homes in winter.
"Climate change is almost certainly involved as well. Our problem is to
unravel those different causes and assess how they interact."
2009 June. Jane Poynter: Life in Biosphere 2. TED.com. Excerpt:
In a March 2009 presentation at TEDxUSC, Jane Poynter tells her story
of living two years and 20 minutes in Biosphere 2 -- an experience that
provoked her to explore how we might sustain life in the harshest of
environments. This 15 minute video is accompanied by an interactive
transcript of the presentation.
2007 January 30. In the Rockies, Pines Die and Bears Feel It. The New York Times, By CHARLES PETIT. Excerpt:
Jesse Logan retired in July as head of the beetle research unit for the
United States Forest Service at the Rocky Mountain Laboratory in Utah.
He is an authority on the effects of temperature on insect life cycles.
That expertise has landed him smack in the middle of a debate over
protecting grizzly bears. Forests of whitebark pine turn red as they
are attacked by the mountain pine beetle. ...Dr. Logan seems, in fact,
to be on a collision course with the federal government, in the debate
over whether to lift Endangered Species Act protections from the
grizzly bears in and around Yellowstone National Park. The grizzly
population in the greater Yellowstone area is estimated to be at least
600. ...Their resurgence in the past 50 years is why the federal
government announced in 2005 the start of proceedings to take them off
the endangered or threatened species list. Dr. Logan enters the fray on
the question of what grizzly bears eat, how much of it will be
available in the future, and where. All that, he says, hinges on the
mountain pine beetle and the whitebark pine....New computer projections
done by Dr. Logan and Jacques Régnière of the Canadian Forest Service
based on recent climate and other data for the mountain West show most
whitebark pine forests being wiped out as warming continues. But the
Wind River Range is projected to stay cold until 2100 or so, which, if
the model is right, means they could be a refuge for grizzlies forced
out of areas where the trees die. ... Dr. Logan's projections shows
devastating whitebark damage from the beetles in the government's core
area for grizzly protection by the end of the century. He says that the
government's recovery area "is completely out of touch with what is
actually happening."... "It's all about global warming," Dr. Logan
said. "I can't say if the beetle will stay out of the Winds for all the
next century. I don't know how long it will take. But one thing I do
know. If it keeps on warming, they'll get nailed there too. The trees
can't move uphill, you know. They'll run out of mountain." What the
bears will fatten for winter on then, nobody knows.
||Archive of Past Articles for Chapter 1
Interactive 3D simulation by Prentice Hall - BIOMES - allows
users to examine the different
biomes on the planet Earth. Students
can rotate the globe to any angle,
identify and choose biomes, and
find out detailed information about
a city in each biome.
Quality & Water Quality. GSS
- Energy Use: Pollution.
Blue Planet Biomes - All
about the world's biomes, their plants,
animals, and climates.