Featured Research

from universities, journals, and other organizations

Age Is More Than A Number: In Barn Owls, It Reveals How Susceptible One Is To Climate Change

Date:
January 16, 2007
Source:
University of Chicago Press Journals
Summary:
Fluctuations in weather and the environment affect survival and reproduction of animals. But are all individuals within a population equally susceptible? Theory on the evolution in age-structured populations suggests not -- those life stages that are more important for overall fitness should be less susceptible to environmental variation than other life stages.

Young barn owls waiting for the return of a parent with prey.
Credit: Photo courtesy of Alex Labhardt

Fluctuations in weather and the environment affect survival and reproduction of animals. But are all individuals within a population equally susceptible? Theory on the evolution in age-structured populations suggests not -- those life stages that are more important for overall fitness should be less susceptible to environmental variation than other life stages. Empirical support for this prediction is rare because detailed data need to be collected over many years, and true variation tends to be inflated through the way in which natural populations are sampled.

Related Articles


In the January issue of The American Naturalist, Res Altwegg (University of Cape Town and University of Victoria), Michael Schaub (Swiss Ornithological Institute and University of Bern), and Alexandre Roulin (University of Lausanne), examined temporal variation in survival and reproduction of barn owls in western Switzerland that had been observed over the past fifteen years. Using recently developed statistical tools, they were able to show that those fitness components that experienced stronger selection were indeed less variable over the years.

"Our results help explain why certain age classes are more susceptible to adverse weather, and they will help us understand how climatic variation affects populations of organisms in nature. This is important for predicting the effect of climate change on populations," the authors said.

Founded in 1867, The American Naturalist is one of the world's most renowned, peer-reviewed publications in ecology, evolution, and population and integrative biology research. AN emphasizes sophisticated methodologies and innovative theoretical syntheses--all in an effort to advance the knowledge of organic evolution and other broad biological principles.

Reference: Altwegg, Res, Michael Schaub, and Alexandre Roulin, "Age-specific fitness components and their temporal variation in the barn owl." The American Naturalist: January 2007.


Story Source:

The above story is based on materials provided by University of Chicago Press Journals. Note: Materials may be edited for content and length.


Cite This Page:

University of Chicago Press Journals. "Age Is More Than A Number: In Barn Owls, It Reveals How Susceptible One Is To Climate Change." ScienceDaily. ScienceDaily, 16 January 2007. <www.sciencedaily.com/releases/2007/01/070110180940.htm>.
University of Chicago Press Journals. (2007, January 16). Age Is More Than A Number: In Barn Owls, It Reveals How Susceptible One Is To Climate Change. ScienceDaily. Retrieved March 30, 2015 from www.sciencedaily.com/releases/2007/01/070110180940.htm
University of Chicago Press Journals. "Age Is More Than A Number: In Barn Owls, It Reveals How Susceptible One Is To Climate Change." ScienceDaily. www.sciencedaily.com/releases/2007/01/070110180940.htm (accessed March 30, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Monday, March 30, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Bionic Ants Could Be Tomorrow's Factory Workers

Bionic Ants Could Be Tomorrow's Factory Workers

Reuters - Innovations Video Online (Mar. 30, 2015) Industrious 3D printed bionic ants working together could toil in the factories of the future, says German technology company Festo. The robotic insects cooperate and coordinate their actions and movements to achieve a common aim. Amy Pollock reports. Video provided by Reuters
Powered by NewsLook.com
Captive-Born Panda Triplets Are Eight Months Old

Captive-Born Panda Triplets Are Eight Months Old

Reuters - Light News Video Online (Mar. 30, 2015) The world&apos;s only surviving captivity-born panda triplets turn eight months old, according to China’s state media. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Lions Make Surprise Comeback in Gabon

Lions Make Surprise Comeback in Gabon

AFP (Mar. 30, 2015) Lions have made a comeback in southeast Gabon, after disappearing for years, according to live footage from US wildlife organisation Panthera. Duration: 00:32 Video provided by AFP
Powered by NewsLook.com
Ancient Egyptian Beer Making Vessels Discovered in Israel

Ancient Egyptian Beer Making Vessels Discovered in Israel

AFP (Mar. 30, 2015) Fragments of pottery used by Egyptians to make beer and dating back 5,000 years have been discovered on a building site in Tel Aviv, the Israeli Antiquities Authority said on Sunday. Duration: 00:51 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins