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.

Related Articles


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 April 19, 2015 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 April 19, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Sunday, April 19, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Un-Bee-Lievable: Bees on the Loose After Washington Truck Crash

Un-Bee-Lievable: Bees on the Loose After Washington Truck Crash

Reuters - US Online Video (Apr. 17, 2015) A truck carrying honey bees overturns near Lynnwood, Washington, spreading boxes of live bees across the highway. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Our Love Of Puppy Dog Eyes Explained By Science

Our Love Of Puppy Dog Eyes Explained By Science

Newsy (Apr. 17, 2015) Researchers found a spike in oxytocin occurs in both humans and dogs when they gaze into each other&apos;s eyes. Video provided by Newsy
Powered by NewsLook.com
Dog Flu Spreading in Midwestern States

Dog Flu Spreading in Midwestern States

AP (Apr. 17, 2015) Dog flu is spreading in several Midwestern states. Dog daycare centers and veterinary offices are taking precautions. (April 17) Video provided by AP
Powered by NewsLook.com
Raw: Rare Whale Spotted in Gulf of Mexico

Raw: Rare Whale Spotted in Gulf of Mexico

AP (Apr. 17, 2015) Researchers from the E/V Nautilus had quite a surprise Tuesday, when a curious sperm whale swam around their remotely operated vehicle in the Gulf of Mexico. Cameras captured the encounter. (April 17) 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:

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