06 May 2014:
Darwin's Finches Fight Off
Parasitic Maggots with Treated Nest Fibers
Sarah Knutie, Univ. of Utah
A Darwin's finch collects treated cotton for its nest
Researchers apparently have discovered a unique way to help Darwin's finches on the Galápagos Islands fight off the parasitic maggots
threatening their survival, according to a new report
in the journal Current Biology
. While working in the Galápagos, scientists from the University of Utah noticed that the finches often collected cotton and other fibers to weave into their nests. The researchers decided to provide the birds with cotton treated with permethrin — a mild pesticide, commonly used to treat head lice in children, that is safe for birds — hoping the finches would incorporate the fibers in their nests. Finches near the test sites did just that, and their "self-fumigated" nests contained about half as many parasitic maggots — which infest and can kill newly-hatched chicks — compared to nests with untreated cotton. The scientists also found that when the birds inserted a gram or more of treated cotton (roughly a thimbleful) in their nests, it killed 100 percent of the maggots, which are larvae of the parasitic fly Philornis downsi
. Darwin's finches and other bird species in the Galápagos have suffered steep population declines since the flies showed up in large numbers in the 1990s.
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
A look at how acidifying oceans could threaten the Dungeness crab, one of the most valuable fisheries on the U.S. West Coast. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
An indigenous tribe’s deadly fight to save its ancestral land in the Amazon rainforest from logging. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
Residents of the Chocó Rainforest in Ecuador are choosing to plant cacao over logging in an effort to slow deforestation.
Watch the video.
Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.