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.

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 Garcνa-Gonzαlez 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 July 29, 2014 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 July 29, 2014).

Share This




More Plants & Animals News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Ebola Virus Threatens West Africa

Deadly Ebola Virus Threatens West Africa

AP (July 28, 2014) — West African nations and international health organizations are working to contain the largest Ebola outbreak in history. It's one of the deadliest diseases known to man, but the CDC says it's unlikely to spread in the U.S. (July 28) Video provided by AP
Powered by NewsLook.com
Traditional African Dishes Teach Healthy Eating

Traditional African Dishes Teach Healthy Eating

AP (July 28, 2014) — Classes are being offered nationwide to encourage African Americans to learn about cooking fresh foods based on traditional African cuisine. The program is trying to combat obesity, heart disease and other ailments often linked to diet. (July 28) Video provided by AP
Powered by NewsLook.com
Asteroid's Timing Was 'Colossal Bad Luck' For The Dinosaurs

Asteroid's Timing Was 'Colossal Bad Luck' For The Dinosaurs

Newsy (July 28, 2014) — The asteroid that killed the dinosaurs struck at the worst time for them. A new study says that if it hit earlier or later, they might've survived. Video provided by Newsy
Powered by NewsLook.com
Raw: Sea Turtle Hatchlings Emerge from Nest

Raw: Sea Turtle Hatchlings Emerge from Nest

AP (July 27, 2014) — A live-streaming webcam catches loggerhead sea turtle hatchlings emerging from a nest in the Florida Keys. (July 27) 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