Navigation Links
Old before their time? Aging in flies under natural vs. laboratory conditions
Date:9/5/2008

Evolutionary studies of aging typically utilize small, short-lived animals (insects, worms, mice) under benign conditions constant temperature and humidity, no parasites, superabundant food in the laboratory. Oddly enough, very little is known about aging in such animals in their harsh, stressful natural environments. Could it be that these laboratory "guinea pigs" actually age much more slowly in captive luxury than do their wild cousins?

Nori Kawasaki, Rob Brooks, and Russell Bonduriansky of the University of New South Wales, and Chad Brassil of the University of Nebraska, set out to find out, using the giant Australian stilt-legged fly Telostylinus angusticollis, a beautiful, sexually dimorphic animal that breeds on rotten wood. To identify individual flies in the wild, they wrote codes (combinations of Arabic numerals and Latin and Japanese letters) on the flies' backs using enamel paint, and recorded the comings and goings of marked individuals on Acacia trunks while simultaneously monitoring their captive cousins in the lab.

Analysis, published in the September issue of the American Naturalist, revealed striking contrasts between wild and captivity: in males, the rate of aging (measured as the rate of increase of mortality rate with age) was as least two-fold greater in the wild than in the laboratory. Curiously, wild females did not seem to age at all. For both sexes, life expectancies in the wild were dramatically shorter than in the lab.

Evolutionary biologists have long sought to understand how environmental factors generate natural selection on the rate of aging, and ultimately influence the frequencies of genes that underpin genetic variation in this trait. Much less is known about how environment affects the expression of genes that modulate aging rate. Kawasaki et al. have shown that animals can age much faster in their stressful natural environments than in the benign conditions of the laboratory. Their results suggest that laboratory estimates of aging and lifespan (and, therefore, fitness) should be interpreted with considerable caution.


'/>"/>

Contact: Patricia Morse
pmorse@uchicago.edu
773-702-0446
University of Chicago Press Journals
Source:Eurekalert  

Related biology news :

1. Rare Antarctic fossils reveal extinction of tundra before full polar climate arrived
2. Obese men have less semen, more sperm abnormalities, and should lose weight before trying for a baby
3. To fight the cancer before the tumor grows
4. SHRM CEO Testifies Before House Subcommittee on Social Security
5. Breast cancers behave differently before and after the age of 70
6. War between the sexes begins before twins birth, TAU researchers say
7. Deadly genetic disease prevented before birth in zebrafish
8. ASU researcher may have discovered key to life before its origin on Earth
9. Generalist bacteria discovered in coastal waters may be more flexible than known before
10. Breast cancer cells have to learn to walk before they can run
11. Laser can spot illness before symptoms appear
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Old before their time? Aging in flies under natural vs. laboratory conditions
(Date:6/22/2016)... June 22, 2016   Acuant , ... verification solutions, has partnered with RightCrowd ® ... for Visitor Management, Self-Service Kiosks and Continuous ... that add functional enhancements to existing physical ... and venues with an automated ID verification ...
(Date:6/21/2016)... British Columbia , June 21, 2016 /PRNewswire/ ... appointed to the new role of principal product ... been named the director of customer development. Both ... NuData,s chief technical officer. The moves reflect NuData,s ... teams in response to high customer demand and ...
(Date:6/16/2016)... The global Biometric ... USD 1.83 billion by 2024, according to a ... proliferation and increasing demand in commercial buildings, consumer ... the market growth.      (Logo: ... of advanced multimodal techniques for biometric authentication and ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... , June 27, 2016 /PRNewswire/ - BIOREM Inc. (TSX-V: BRM) ... advised by its major shareholders, Clean Technology Fund I, ... United States based venture capital funds which ... Biorem (on a fully diluted, as converted basis), that ... of their entire equity holdings in Biorem to TUS ...
(Date:6/27/2016)... ... June 27, 2016 , ... Newly ... technologies, services and solutions to the healthcare market. The company's primary focus is ... manufacturing, sales and marketing strategies that are necessary to help companies efficiently bring ...
(Date:6/24/2016)... 2016  Regular discussions on a range of subjects including ... two entities said Poloz. Speaking at a lecture ... , he pointed to the country,s inflation target, which is ... "In certain areas there ... common economic goals, why not sit down and address strategy ...
(Date:6/23/2016)... , ... June 23, 2016 , ... ... release of its second eBook, “Clinical Trials Patient Recruitment and Retention Tips.” Partnering ... retention in this eBook by providing practical tips, tools, and strategies for clinical ...
Breaking Biology Technology: