Navigation Links
The more promiscuous the female, the speedier the sperm
Date:1/21/2009

Female promiscuity appears to have triggered changes in the type of sperm a male produces, according to new research on fish from central Africa.

The study, published in the Proceedings of the National Academy of Sciences of the USA, examines how competition for reproduction influences the sperm of many species of African cichlids. These fish have extremely diverse mating behaviours, ranging from strict monogamy to species where females mate with many males in quick succession.

"In promiscuous species we found that males produced larger and faster sperm than in closely related species that were monogamous," says Sigal Balshine, associate professor in the department of Psychology, Neuroscience & Behaviour at McMaster University, and senior author on the study. "This research offers some of the first evidence that sperm has evolved to become more competitive in response to females mating with multiple males."

Female promiscuity is a major problem for males because the sperm from rival suitors will compete in the race to procreate, explains Balshine. While the idea that sperm would evolve to become more competitive when males compete for fertilization seems obvious, to date there has been little evidence to support this theory.

For the study, researchers collected males from 29 closely related species found off the Zambian shores of Lake Tanganyika (Africa). After examining the relationship between promiscuity and sperm quality the researchers used computer simulations to assess how sperm evolved in these fish.

"Our analysis confirmed that sperm became more competitive only after a species shifted their mating behaviours to become more promiscuous," says John Fitzpatrick, lead author of the study and a biology graduate student from McMaster University, now with the University of Western Australia. "The first step in producing more competitive sperm was by influencing how much energy the sperm can produce. Just like a mechanic could make a car drive faster by installing a better engine, evolution appears to act first on the engine that drives sperm movement."


'/>"/>

Contact: Michelle Donovan
donovam@mcmaster.ca
905-525-9140
McMaster University
Source:Eurekalert

Related biology news :

1. In promiscuous antelopes, the battle of the sexes gets flipped
2. Proteins in sperm unlock understanding of male infertility says new study
3. Low sperm count may be associated with prenatal testosterone excess
4. Unique study shows oil, gas seismic work not affecting Gulf sperm whales
5. Obese men have less semen, more sperm abnormalities, and should lose weight before trying for a baby
6. Diabetes linked to male infertility; excess sugars in the body have direct effect on sperm quality
7. Normal-looking sperm may have serious damage; scientists urge more care in selection
8. Wiggle room: Cornell researcher borrows idea from sperm to provide energy for nanoscale robots
9. Mutant sperm guide clinicians to new diseases
10. Primate sperm competition: speed matters
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/26/2017)... , Jan. 26, 2017  Acuity Market ... for Biometrics and Digital Identity".  Acuity characterizes 2017 ... identity when increased adoption reflects a new understanding ... "Biometrics and digital identity are often ... Maxine Most , Principal of Acuity Market ...
(Date:1/24/2017)... , Jan. 24, 2017 Biopharm Reports ... the laboratory use of nuclear magnetic resonance spectroscopy ... end-users and profiled current practices, developments, trends and ... well as growth and opportunities. These areas include ... NMR instruments, needs and innovation requirements, hyphenated NMR ...
(Date:1/23/2017)... 2017  The latest mobile market research from Acuity ... dramatically. The quarterly average price of a biometric smartphone ... Q4 2016.  There are now 120 sub-$150 models on ... from just 28 a year ago at an average ... Maxine Most , Acuity Market Intelligence Principal, "Biometric Smartphones ...
Breaking Biology News(10 mins):
(Date:2/24/2017)... Feb. 24, 2017 Provectus Biopharmaceuticals, Inc. ... "Company"), a clinical-stage oncology and dermatology biopharmaceutical company, ... to participate in its previously announced rights offering ... shares of common stock and Series C Convertible ... listed warrants. As previously announced, ...
(Date:2/24/2017)... (PRWEB) , ... February 24, 2017 , ... FireflySci, Inc ... Founded in late 2014, FireflySci had the goal of bringing their powerful cuvette ... continues to shape the path that FireflySci is going on as they add yet ...
(Date:2/23/2017)... SAN RAFAEL, Calif., Feb. 23, 2017 ... of U.S. dollars, except per share data, unaudited)Three Months ... ChangeTotal BioMarin Revenue $ ...     22832%$ 1,117$   89026%Aldurazyme Net Product Revenue ... 906538%34823946%Naglazyme Net Product Revenue  ...
(Date:2/23/2017)... Capitol Hill neighborhood, with its swanky shops, parks and cafés, might ... salon to set up shop. But there,s Hair Fairies ... on E Madison Ave, and CEO Maria Botham ... we pride ourselves on being a destination for parents and ... associated with lice. Everyone can get lice – it doesn,t ...
Breaking Biology Technology: