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
'/>"/>

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

Page: 1 2

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:8/12/2015)... , Aug. 12, 2015   MedNet Solutions , ... entire spectrum of clinical research, is proud to announce ... company,s comprehensive SaaS-based eClinical technology platform, has led the ... first two quarters of 2015.   Q2 2015 and ... quarters measured by contract value sold in the company,s ...
(Date:8/10/2015)... Germany , August 10, 2015 /PRNewswire/ ... world leader in Eye Tracking Technology for more than ... Eye Tracking Platform for integration into all consumer display ... designs for seamless integration of eye tracking into consumer ... and augmented reality smart glasses. Omnivision,s leading sensor technology ...
(Date:8/5/2015)... August 5, 2015 According to ... Management Market by Software, Services, Vertical (BFSI, Airport, IT & ... - Global Forecast to 2020", published by MarketsandMarkets, defines ... globally into various segments. The global PIAM Market is ... $546.2 Million by 2019, at a CAGR of 14.9 ...
Breaking Biology News(10 mins):MedNet Solutions Experiences Explosive Corporate Growth 2SMI Completes OEM Eye Tracking Platform to Cover All Consumer Displays 2SMI Completes OEM Eye Tracking Platform to Cover All Consumer Displays 3Physical Identity and Access Management Market Worth $546.2 Million by 2019 2Physical Identity and Access Management Market Worth $546.2 Million by 2019 3Physical Identity and Access Management Market Worth $546.2 Million by 2019 4
... LOUISVILLE, Ky. -- By creating a unique system of ... tissue surrounding an implanted device, the longevity and function ... a study led by researchers in the University of ... was published early online on August 23, 2010 in ...
... that treatments targeting specific viral genes protected monkeys infected ... were protected even when therapeutics were administered one hour ... infections in laboratory or hospital settings. The research, ... Nature Medicine , was conducted by the U.S. ...
... Calif. Jodie Holt , a professor of plant ... consultant for James Cameron,s film Avatar , ... her life,s work as a distinguished scientist and educator" at ... the San Diego Botanic Garden, 230 Quail Gardens Drive, Encinitas, ...
Cached Biology News:New technology may prolong the life of implanted devices, from pacemakers to chemotherapy ports 2Novel 'antisense' therapies protect primates from lethal Ebola and Marburg viruses 2Novel 'antisense' therapies protect primates from lethal Ebola and Marburg viruses 3
(Date:8/27/2015)... (PRWEB) , ... August 27, 2015 , ... ... customers’ weighing needs and expertly narrows down the product choices to a manageable ... criteria pares down the list to models that fit best with the customer’s ...
(Date:8/26/2015)... -- Roka Bioscience, Inc. (NASDAQ: ROKA ), a molecular ... the detection of foodborne pathogens, today announced that Paul ... Company Emerging Growth Conference on September 2 at 9:20am ... York Marriott Marquis. A live webcast ... relations section of Roka Bioscience,s website at http://rokabio.investorroom.com/ ...
(Date:8/26/2015)... BEIJING , August 26, 2015 ... DiaCardio wins 1 st place  Wayerz ... led in Israel by venture capital fund ... countries including the US, China , ... Latin America .  Impressive achievement for the Israeli ...
(Date:8/26/2015)... ... August 26, 2015 , ... The 2015 Epigenomics & Metabolomics ... technology start-up company Asymmetrex to share the first report on progress with ... biomarker for counting adult tissue stem cells. , With a name like “H2A.Z asymmetry,” ...
Breaking Biology Technology:METTLER TOLEDO Updates Online Scale Selection Tool 2Israeli Startup Takes First Place at Shengjing Global Innovation Awards 2015 2Israeli Startup Takes First Place at Shengjing Global Innovation Awards 2015 3Israeli Startup Takes First Place at Shengjing Global Innovation Awards 2015 4Israeli Startup Takes First Place at Shengjing Global Innovation Awards 2015 5Israeli Startup Takes First Place at Shengjing Global Innovation Awards 2015 6Asymmetrex Reports Positive Indicators for Crowdsourcing Campaign to Evaluate New Biomarker for Counting Adult Tissue Stem Cells for the First Time 2Asymmetrex Reports Positive Indicators for Crowdsourcing Campaign to Evaluate New Biomarker for Counting Adult Tissue Stem Cells for the First Time 3Asymmetrex Reports Positive Indicators for Crowdsourcing Campaign to Evaluate New Biomarker for Counting Adult Tissue Stem Cells for the First Time 4
... University of Pittsburgh-led team has created a single-electron ... more powerful computer memories, advanced electronic materials, and ... researchers report in Nature Nanotechnology that ... in diameteroperates with the addition of only one ...
... ImaginAb, Inc. and the University of California, Los Angeles ... fluorine chemistry for the rapid and robust labeling ... with Positron Emission Tomography (PET). ... and recognized the cutting-edge work being developed by the Crump ...
... Professor Andre Geim, a recipient of the 2010 Nobel Prize ... flow of electrons can magnetise graphene. The results, ... breakthrough in the field of spintronics. Spintronics is a ... the electron, in addition to its fundamental electric charge that ...
Cached Biology Technology:Pitt-led researchers create super-small transistor, artificial atom powered by single electrons 2ImaginAb, Inc. Concludes Licensing Agreement With UCLA for Novel Radiochemistry Technology 2New spin on graphene 2
... of gene expression) technology allows ... profiles generated by SAGE are ... transcripts making it possible to ... Kit is designed to make ...
... and flexibility press-to-seal silicone isolators can be ... researcher. They are available either pre-cut to ... that can be easily trimmed to prepare ... non-cytotoxic and can be used to isolate ...
The ELISA Kit for Hepatitis B Surface Antigen (HBsAg) is an in vitro enzyme immunoassay for the detection of HBsAg in human serum or plasma....
Alexa Fluor 350/488/594 Filter Set (Semrock Brightline) *mounted* *Zeiss Axio AF...
Biology Products: