Migratory birds not choosy about their halt
August 13th, 2009 - 3:23 pm ICT by IANSWashington, Aug 13 (IANS) If a lush, protected forest with a winding stream is considered luxury accommodation for a migratory bird, a new study shows that they would be just as happy with the equivalent of a cheap roadside motel.
John Dunning, associate professor of forestry and natural resources at Purdue University, found that migrating birds are just as likely to stop in small woodlots in the middle of an agricultural field for the night as long as there is adequate protection and food.
Dunning said the finding suggests that conservation efforts should extend to smaller forested lands to help stabilize declining migratory bird populations.
“There are strategies for conserving forests for migratory birds, but those strategies emphasize the largest patches of forest,” Dunning said.
“We found that even very small woodlots were filled with migratory birds at times. It makes us believe we also need to conserve the little patches of forest, not just the big ones.”
Dunning and graduate student Diane Packett observed woodlots at three distances from Indiana’s Wabash River and its tributaries - within half a km, between one and five km and at about 20 km.
The woodlots were less than 20 acres and had row crops surrounding them on at least three sides. Dunning and Packett made observations in both spring and autumn.
There were 76 different species of migratory birds found in the woodlots, with no statistical differences in the number of species or overall population of birds based on distance from streams.
Packett said the birds, which travel thousands of miles between South and Central America and Canada twice a year, sometimes just need a place to stop along their journey.
As forests have been cleared for development, agriculture and other uses, those birds have to make do with whatever patches of forest they can find when they become tired or encounter bad weather.
“They don’t make the trip all in one jump. It can be thousands of miles they have to fly,” Packett said. “They need safe places to stop, eat and rest. If they don’t have that, they might not survive,” he said.
These findings were published in the current issue of The Auk, the journal of the American Ornithologists’ Union.
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Tags: adequate protection, agricultural field, associate professor, bad weather, conservation efforts, forested lands, forests, graduate student, luxury accommodation, migrating birds, migratory bird populations, migratory birds, purdue university, roadside motel, row crops, spring and autumn, statistical differences, tributaries, wabash river, winding stream
