Featured Research

from universities, journals, and other organizations

Field-cricket Study Shows That When It Comes To Competition, Sperm Quality Matters

Date:
February 12, 2005
Source:
Cell Press
Summary:
By studying the relationship between sperm viability and reproductive success in a cricket species, researchers have come closer to understanding the contribution of sperm quality to reproductive success, at least in insects.

By studying the relationship between sperm viability and reproductive success in a cricket species, researchers have come closer to understanding the contribution of sperm quality to reproductive success, at least in insects.

Related Articles


A major advance in evolutionary theory has been the realization that sexual selection continues after mating; selection includes not only the competition among males to mate with females but also, in many species, the contest among the males' ejaculates to fertilize eggs (sperm competition). After more than three decades of studying sperm competition, researchers have clearly proved that this phenomenon has been a powerful selective force that has shaped many aspects of sexual reproduction.

The most obvious adaptation to sperm competition is the selection in males for increased sperm number; producing more sperm is adaptive when sperm competition is based on sheer numbers of gametes. It is also known that in vertebrates sperm quality plays an important role in predicting a male's fertilization ability--and, more importantly, in predicting a male's ultimate fertilization success in mating contexts that involve sperm competition. However, although sperm competition is particularly common among insects, there is a paucity of insect studies examining the selective pressures acting on sperm quality.

In the new work, researchers Francisco Garcia-Gonzalez and Leigh Simmons of the University of Western Australia tested the hypothesis that sperm viability influences insect paternity success by conducting sperm-competition trials involving pre-screened males that differed in the viability of their sperm. Using the Australian field cricket as the study's subject, the researchers showed that the proportion of live sperm in a male's ejaculate determines that male's paternity success. Furthermore, when two males competed for fertilizing the ova of a female, the researchers were able to predict the patterns of paternity based on the relative representation of a male's viable sperm in the female's sperm storage organ. These findings provide the first experimental evidence for the theory that sperm competition selects for higher sperm quality in insects and indicate that the understanding of post-copulatory sexual selection generally would gain from taking into account variation in sperm quality among males.

###

Francisco García-González and Leigh W. Simmons: "Sperm Viability Matters in Insect Sperm Competition"

The study was supported by grants from the Secretaria de Estado de Educacion y Universidades and the European Social Fund to F.G.-G. and from the Australian Research Council to L.W.S.

Publishing in Current Biology, Volume 15, Number 3, February 8, 2005, pages 271–275. http://www.current-biology.com


Story Source:

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


Cite This Page:

Cell Press. "Field-cricket Study Shows That When It Comes To Competition, Sperm Quality Matters." ScienceDaily. ScienceDaily, 12 February 2005. <www.sciencedaily.com/releases/2005/02/050211091745.htm>.
Cell Press. (2005, February 12). Field-cricket Study Shows That When It Comes To Competition, Sperm Quality Matters. ScienceDaily. Retrieved March 5, 2015 from www.sciencedaily.com/releases/2005/02/050211091745.htm
Cell Press. "Field-cricket Study Shows That When It Comes To Competition, Sperm Quality Matters." ScienceDaily. www.sciencedaily.com/releases/2005/02/050211091745.htm (accessed March 5, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Thursday, March 5, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Praying Mantis Looks Long Before It Leaps

Praying Mantis Looks Long Before It Leaps

Reuters - Innovations Video Online (Mar. 5, 2015) — Slowed-down footage of the leaps of praying mantises show the insect&apos;s extraordinary precision, say researchers. Video provided by Reuters
Powered by NewsLook.com
Octopus Grabs Camera and Turns It Around On Photographer

Octopus Grabs Camera and Turns It Around On Photographer

Buzz60 (Mar. 5, 2015) — A photographer got the shot of a lifetime, or rather an octopus did, when it grabbed the camera and turned it around to take an amazing picture of the photographer. Jen Markham (@jenmarkham) has the story. Video provided by Buzz60
Powered by NewsLook.com
Ringling Bros. Eliminating Elephant Acts

Ringling Bros. Eliminating Elephant Acts

AP (Mar. 5, 2015) — The Ringling Bros. and Barnum & Bailey Circus is ending its iconic elephant acts. The circus&apos; parent company, Feld Entertainment, told the AP exclusively that the acts will be phased out by 2018 over growing public concern about the animals. (March 5) Video provided by AP
Powered by NewsLook.com
Raw: Tourists Visit Rare Grey Whales in Mexico

Raw: Tourists Visit Rare Grey Whales in Mexico

AP (Mar. 4, 2015) — Once nearly extinct, grey whales now migrate in their thousands to Mexico&apos;s Vizcaino reserve in Baja California, in search of warmer waters to mate and give birth. Tourists flock to the reserve to see the whales, measuring up to 49 feet long. (March 4) 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