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Findings raise new questions about evolution of hormones in mammals
Date:2/13/2009

specific sample and a social context to know what's going on hormonally," Randall said.

To study stress in natural populations, Randall collected feces from the great gerbil, Rhombomys opimus, in Uzbekistan over the course of six years, and the giant kangaroo rat, Dipodomys ingens, in California. The great gerbils are highly social rodents who live in high density communities. Some male gerbils would live with up to six females and their offspring. Randall wanted to know whether the social stress was affecting the male's ability to survive. For six years, Randall and her collaborators collected feces from specific males at various times throughout the year and found that males were stressed in large family groups but that outside factors like drought had a greater influence on survival than stress.

Randall and her graduate student, Julia Barfield, collected fecal samples during the breeding and non-breeding cycles of the giant kangaroo rat. They found significantly higher levels of testosterone in the summer non-breeding season than in the breeding season in both male and female kangaroo rats, which counters previous research conducted in a laboratory setting. Randall said the finding illustrates the flexibility of hormonal control systems and the importance of exploring them in wild populations.


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Contact: Michael Bruntz
mbruntz@sfsu.edu
415-338-1743
San Francisco State University
Source:Eurekalert

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