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Tags trace dragonfly migration CBC News \|\| May 23, 2006 Related - US Federal plan aims to track all livestock by 2009 Migrating dragonflies fly up to 137 kilometres a day, following a path similar to that of songbirds, biologists have found. American researchers attached tiny radio transmitters to 14 green darner dragonflies migrating along the east coast of the U.S. They then tracked their signals from an airplane and from the ground. "The dragonflies' routes have shown distinct stopover and migration days, just as the birds' did," said Martin Wikelski, an ecology professor at Princeton University in New Jersey who led the study. Both birds and dragonflies also refrained from migrating in high winds and only moved after two successive nights of falling temperatures – a sign a cold front is approaching with favourable winds. Article Posted at www.KnowledgeDrivenRevolution.com "The migratory patterns and apparent decision rules of green darners are strikingly similar to those proposed for songbirds, and may represent a general migration strategy for long-distance migration of organisms with high self-propelled flight speeds," the team concludes in Thursday's issue of the journal Biology Letters. Green darner dragonflies are among the 25 to 50 species of dragonflies thought to migrate among 5,200 dragonfly species worldwide, the researchers said. Each radio transmitter weighed only 300 milligrams, or about a third as much as a paper clip. Wikelski also hopes to use the transmitters to track how locusts move, to better predict where and when infestations will hit farmers. About KDR \| \| Home \| \| Weekly Features Archive	Weekly Weekly Features Archive
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Tags trace dragonfly migration

CBC News || May 23, 2006

Related - US Federal plan aims to track all livestock by 2009

Migrating dragonflies fly up to 137 kilometres a day, following a path similar to that of songbirds, biologists have found.

American researchers attached tiny radio transmitters to 14 green darner dragonflies migrating along the east coast of the U.S.

They then tracked their signals from an airplane and from the ground.

"The dragonflies' routes have shown distinct stopover and migration days, just as the birds' did," said Martin Wikelski, an ecology professor at Princeton University in New Jersey who led the study.

Both birds and dragonflies also refrained from migrating in high winds and only moved after two successive nights of falling temperatures – a sign a cold front is approaching with favourable winds.

Article Posted at www.KnowledgeDrivenRevolution.com

"The migratory patterns and apparent decision rules of green darners are strikingly similar to those proposed for songbirds, and may represent a general migration strategy for long-distance migration of organisms with high self-propelled flight speeds," the team concludes in Thursday's issue of the journal Biology Letters.

Green darner dragonflies are among the 25 to 50 species of dragonflies thought to migrate among 5,200 dragonfly species worldwide, the researchers said.

Each radio transmitter weighed only 300 milligrams, or about a third as much as a paper clip.

Wikelski also hopes to use the transmitters to track how locusts move, to better predict where and when infestations will hit farmers.

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