[net-gold] INSECTS : BIOLOGY: BOTANY: PLANTS : INSECTICIDES : ECOLOGY : ENVIRONMENT : HERBICIDES : URBAN DEVELOPMENT : GENETICALLY ENGINEERED CROPS : FOOD CHAIN: Why Has The Magnificent Monarch Butterfly Migration Slowed To A Trickle?
- From: "David P. Dillard" <jwne@xxxxxxxxxx>
- To: Net-Gold -- Educator Gold <Educator-Gold@xxxxxxxxxxxxxxx>, net-gold@xxxxxxxxxxxxx, Net-Gold <Net-Gold@xxxxxxxxxxxxxxx>, NetGold <netgold@xxxxxxxxxxxxxxx>, K-12ADMINLIFE <K12ADMIN@xxxxxxxxxxxxxxxxxxx>, K12AdminLIFE <K12AdminLIFE@xxxxxxxxxxxxxxx>, MediaMentor <mediamentor@xxxxxxxxxxxxxxx>, Nabble Groups Net-Gold <ml-node+s3172864n3172864h56@xxxxxxxxxxxxx>, Net-Platinum <net-platinum@xxxxxxxxxxxxxxx>, Sean Grigsby <myarchives1@xxxxxxxxxxxxxxx>, Net-Gold <NetGold_general@xxxxxxxxxxxxxxxxx>, Temple Gold Discussion Group <TEMPLE-GOLD@xxxxxxxxxxxxxxxxxxx>, Temple University Net-Gold Archive <net-gold@xxxxxxxxxxxxxxxxxxx>, "Net-Gold @ Wiggio.com" <netgold@xxxxxxxxxxxxxx>, Health Lists -- Health Diet Fitness Recreation Sports <healthrecsport@xxxxxxxxxxxxxxx>, HEALTH-RECREATION-SPORTS-TOURISM@xxxxxxxxxxxxxxxxxxx
- Date: Sat, 8 Feb 2014 12:56:22 -0500 (EST)
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INSECTS :
BIOLOGY: BOTANY: PLANTS :
INSECTICIDES :
ECOLOGY :
ENVIRONMENT :
FOOD CHAIN :
HERBICIDES :
GENETICALLY ENGINEERED CROPS :
URBAN DEVELOPMENT:
Why Has The Magnificent Monarch Butterfly Migration Slowed To A Trickle?
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Why Has The Magnificent Monarch Butterfly Migration Slowed To A Trickle?
By Joanna M. Foster
January 31, 2014 at 12:09 pm
Climate Progress
http://thinkprogress.org/climate/2014/01/31/3230561/
monarch-migration-decline/
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A shorter URL for the above link:
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http://tinyurl.com/oucmehl
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Researchers have identified three major factors that are driving the
decline: deforestation in Mexico, agriculture displacing key milkweed
habitat in the U.S., and episodes of extreme weather along the migration
route.
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The deforestation in Mexico is leading to less dense tree cover in the
monarch's wintering area which makes the butterflies incredibly vulnerable
to unusual weather. In 2002, for example, a single storm killed about 75
percent of the wintering population.
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The ongoing drought in the Southwest has also taken a toll on the species.
The butterflies depend on being able to fatten up on wildflower nectar in
Texas to have enough energy reserves to make it through the winter. When
the wildflowers can't survive the drought, the butterflies are in danger
of starving.
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Other studies looking at the connections between climate change and
monarch migration have found that monarchs need consistent cold triggers
to continue migrating south to Mexico in the fall - without those cold
conditions, monarchs in the midst of migrating south can actually reorient
themselves and fly north where they cannot survive the winter.
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The story of monarch butterflies confused by climate change was at the
center of New York Times best-selling author Barbara Kingsolver's most
recent novel, Flight Behavior.
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The third culprit in the monarch's decline is the ubiquity of genetically
modified crops that are resistant to the weed-killer, Round Up. Thanks to
these plants' engineered hardiness, Round Up is now liberally applied
across agricultural fields. This kills milkweed plants, which would
otherwise thrive around fields and in ditches. Milkweeds are the only type
of plant that monarchs use for laying their eggs.
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Few researchers fear that monarch butterflies will actually go extinct,
but some do worry that the migration may collapse altogether.
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The complete article may be read at the URL above.
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Sincerely,
David Dillard
Temple University
(215) 204 - 4584
jwne@xxxxxxxxxx
http://workface.com/e/daviddillard
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- » [net-gold] INSECTS : BIOLOGY: BOTANY: PLANTS : INSECTICIDES : ECOLOGY : ENVIRONMENT : HERBICIDES : URBAN DEVELOPMENT : GENETICALLY ENGINEERED CROPS : FOOD CHAIN: Why Has The Magnificent Monarch Butterfly Migration Slowed To A Trickle? - David P. Dillard
