'Teenage' songbirds experience high mortality due to many causes, study finds

May 8, 2014
Researchers banded nestling birds, such as this ovenbird, and then radio-tracked them for several weeks after leaving the nest to determine survival and habitat use. Credit: Credit: Julianna Jenkins, University of Missouri Ph.D. candidate.

Nearly one-third of songbird species across North America are experiencing long-term declines. Scientists have spent years researching potential causes for these population declines, focusing on the birds when they have just hatched as well as when they are adults. Now, researchers from the University of Missouri and the U.S. Department of Agriculture have found that songbirds are vulnerable to environmental dangers particularly when they are juveniles, shortly after they have left their parents' nests. Frank Thompson, a scientist with the USDA Forest Service and an associate cooperative professor in the MU College of Agriculture, Food and Natural Resources (CAFNR), worked with several colleagues to find that the majority of juvenile bird deaths occur in the first three weeks after they leave the nest.

"Just like teenagers leaving home to live on their own for the first time, these juvenile are inexperienced and vulnerable to the outside world," said Thompson. "It is important for these young birds to find acceptable habitats and shelter for them to survive on their own. Therefore, it is important for conservationists to find ways to provide the right habitats for these birds to survive during what is an important, yet vulnerable, time in their development."

Thompson says juvenile birds often seek different types of habitats compared to their parents. He says that juvenile songbirds often prefer denser foliage such as shrub land and young forest, compared to more open, older forests where their parents may have nested.

"It is important for conservation groups and land managers to know exactly what types of habitats need to be provided in order to protect these birds," Thompson said. "Providing habitats needed by breeding adult birds won't make much of a difference if those birds don't survive long enough to reach adulthood because they don't have adequate shelter when they are young. This approach is part of a growing focus on full-cycle conservation for migrant "

Researchers radio-tracked juvenile songbirds for several weeks after the left the nest, such as this Acadian flycatcher, to determine survival and habitat use. Credit: Credit: Julianna Jenkins, University of Missouri Ph.D. candidate.

Thompson says many studies have looked into mortality rates for fully grown birds as well as chicks that have just hatched, but not enough work has been done on that have just left the nest and are becoming independent. He recommends further study on this important life stage for in order to better understand specific causes for high mortality rates.

The study was published in the Journal of Wildlife Management.

Explore further: Study shows some cuckoo birds may actually help their hosts

Related Stories

Study shows some cuckoo birds may actually help their hosts

March 21, 2014

(Phys.org) —A team of researchers in Spain has found that at least one species of cuckoo bird may actually help its nest-mates survive. In their paper published in the journal Science, the team describes how in studying ...

Study documents effects of mercury on songbird reproduction

May 7, 2014

(Phys.org) —Mercury takes a toll on the population of songbirds, even at sublethal doses. Research conducted on captive birds at William & Mary showed that reproductive success went down as the dosage of mercury increased. ...

Threats seen to three billion birds in vast Canadian forest

May 7, 2014

A new report calls for saving half of the 1.5 billion acres of North America's boreal forest – one of the world's last great intact forests – to protect the habitat for more than 300 migratory bird species. The northern ...

Recommended for you

A better way to read the genome

October 9, 2015

UConn researchers have sequenced the RNA of the most complicated gene known in nature, using a hand-held sequencer no bigger than a cell phone.

Threat posed by 'pollen thief' bees uncovered

October 9, 2015

A new University of Stirling study has uncovered the secrets of 'pollen thief' bees - which take pollen from flowers but fail to act as effective pollinators - and the threat they pose to certain plant species.

Mapping the protein universe

October 9, 2015

To understand how life works, figure out the proteins first. DNA is the architect of life, but proteins are the workhorses. After proteins are built using DNA blueprints, they are constantly at work breaking down and building ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.