Featured Research

from universities, journals, and other organizations

How Are Phenotypic Differences Between Sexes Related To Phenotypic Variation Within Sexes?

Date:
January 11, 2007
Source:
University of Chicago Press Journals
Summary:
It has long been recognized that sexually dimorphic traits -- traits that are systematically different between members of different sex in the same species, such as peacocks' tail feathers -- tend to vary a great deal among individual males, and that much of this within-sex variation depends on individual condition. Indeed, theory predicts that sexual dimorphism will evolve based on condition dependence so that, among traits, a more pronounced difference between male and female should be associated with a stronger response to variation in condition.

Telostylinus angusticollis males vary enormously in body size and shape -- these wild males are aggregated on the bark of a rotting Acacia longifolia tree in Sydney, Australia.
Credit: Photo courtesy of R. Bonduriansky

It has long been recognized that sexually dimorphic traits -- traits that are systematically different between members of different sex in the same species, such as peacocks' tail feathers -- tend to vary a great deal among individual males, and that much of this within-sex variation depends on individual condition. Indeed, theory predicts that sexual dimorphism will evolve based on condition dependence so that, among traits, a more pronounced difference between male and female should be associated with a stronger response to variation in condition.

Russell Bonduriansky (University of New South Wales in Sydney) tested this prediction using the giant stilt-legged fly Telostylinus angusticollis, which breeds on rotting tree trunks along Australia's east coast. Analysis of multiple body shape components revealed a remarkable congruence between the degree of sexual dimorphism and the strength of condition dependence, accounting for nearly all of the variation in these traits.

"There is no sexual dimorphism without condition dependence in this species -- they are conceptually and biologically inseparable," says Bonduriansky. "The evidence suggests that sexual dimorphism is a pleiotropic consequence of genes that generate condition dependence." These findings call for a unification of evolutionary and genetic models of sexual dimorphism and condition dependence.

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: Bonduriansky, Russell, "The evolution of condition dependent sexual dimorphism." 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. "How Are Phenotypic Differences Between Sexes Related To Phenotypic Variation Within Sexes?." ScienceDaily. ScienceDaily, 11 January 2007. <www.sciencedaily.com/releases/2007/01/070110180929.htm>.
University of Chicago Press Journals. (2007, January 11). How Are Phenotypic Differences Between Sexes Related To Phenotypic Variation Within Sexes?. ScienceDaily. Retrieved September 20, 2014 from www.sciencedaily.com/releases/2007/01/070110180929.htm
University of Chicago Press Journals. "How Are Phenotypic Differences Between Sexes Related To Phenotypic Variation Within Sexes?." ScienceDaily. www.sciencedaily.com/releases/2007/01/070110180929.htm (accessed September 20, 2014).

Share This



More Plants & Animals News

Saturday, September 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: San Diego Zoo Welcomes Cheetah Cubs

Raw: San Diego Zoo Welcomes Cheetah Cubs

AP (Sep. 20, 2014) The San Diego Zoo has welcomed two Cheetah cubs to its Safari Park. The nearly three-week-old female cubs are being hand fed and are receiving around the clock care. (Sept. 20) Video provided by AP
Powered by NewsLook.com
Chocolate Museum Opens in Brussels

Chocolate Museum Opens in Brussels

AFP (Sep. 19, 2014) Considered a "national heritage" in Belgium, chocolate now has a new museum in Brussels. In a former chocolate factory, visitors to the permanent exhibition spaces, workshops and tastings can discover derivatives of the cocoa bean. Duration: 01:00 Video provided by AFP
Powered by NewsLook.com
Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com
Jury Delivers Verdict in Salmonella Trial

Jury Delivers Verdict in Salmonella Trial

AP (Sep. 19, 2014) A federal jury has convicted three people in connection with an outbreak of salmonella poisoning five years ago that sickened hundreds of people and was linked to a number of deaths. (Sept. 19) Video provided by AP
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:
from the past week

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