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Larry and others will be interested in this study. If you look at the
link, the article is near the bottom of the page.
Lois Codling
Monarch migration aggravation
<https://world.wng.org/content/time_to_get_over_darwin/#monarchs>
Soon the monarch butterflies of North America will begin their annual
fall migration to the warmer climates of California or Mexico, where
they will winter until their return next spring. Over the past two
decades, the number of North American monarchs has dwindled by 90
percent. To boost their numbers, hobbyists raise large numbers of
monarchs, and commercial breeders sell them for school children to
release. But a study <https://www.pnas.org/content/116/29/14671>
published July 16 in the /Proceedings of the National Academy of
Sciences/, showed that captive breeding disrupts monarchs’ migratory
instinct, keeping them from flying south to survive the cold winter.
In the study, conducted by scientists at the University of Chicago,
monarchs purchased from a commercial breeder and those caught in the
wild and raised in an indoor environment mimicking the outdoors failed
to fly southward. Even monarchs that had completed an outdoor life cycle
before the researchers brought them indoors lost their ability to migrate.
“Our results provide a window into the complexity—and remarkable
fragility—of migration,” the researchers said. —/J.B./
/
/
/https://world.wng.org/content/time_to_get_over_darwin
/
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<div class="moz-forward-container">Larry and others will be
interested in this study. If you look at the link, the article is
near the bottom of the page.<br>
<br>
Lois Codling<br>
<br>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<h2><a class="Colorbox"
href="https://world.wng.org/content/time_to_get_over_darwin/#monarchs"
target="_blank" moz-do-not-send="true">Monarch migration
aggravation</a></h2>
<p>Soon the monarch butterflies of North America will begin their
annual fall migration to the warmer climates of California or
Mexico, where they will winter until their return next spring.
Over the past two decades, the number of North American monarchs
has dwindled by 90 percent. To boost their numbers, hobbyists
raise large numbers of monarchs, and commercial breeders sell
them for school children to release. But a <a class="Colorbox"
href="https://www.pnas.org/content/116/29/14671"
target="_blank" moz-do-not-send="true">study</a> published
July 16 in the <em>Proceedings of the National Academy of
Sciences</em>, showed that captive breeding disrupts monarchs’
migratory instinct, keeping them from flying south to survive
the cold winter.</p>
<p>In the study, conducted by scientists at the University of
Chicago, monarchs purchased from a commercial breeder and those
caught in the wild and raised in an indoor environment mimicking
the outdoors failed to fly southward. Even monarchs that had
completed an outdoor life cycle before the researchers brought
them indoors lost their ability to migrate.</p>
<p>“Our results provide a window into the complexity—and
remarkable fragility—of migration,” the researchers said. —<em>J.B.</em></p>
<p><em><br>
</em></p>
<p><em><a class="moz-txt-link-freetext"
href="https://world.wng.org/content/time_to_get_over_darwin"
moz-do-not-send="true">https://world.wng.org/content/time_to_get_over_darwin</a><br>
</em></p>
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