HOME >> BIOLOGY >> NEWS
Monogamy Has Its Rewards For Flies

Having sex with only one partner makes males nicer and females less defensive, at least in fruit flies. It seems the flies don't benefit from having a choice of mate. In fact, they do worse.

Male Drosophila melanogaster are promiscuous and compete for available females. To try to ensure that their sperm fertilises the female's eggs, males have evolved toxic seminal fluid that disables the sperm of other males that have mated with the same female, and carries hormones that make the female less sexually receptive, reducing the chance that she will mate again. These toxins and hormones are harmful to females, however, so they have evolved defences against them.

In short, sex in fruit flies is a running battle in which males have evolved to fertilise as many eggs as possible, while females have evolved to protect their own health. "They can antagonistically coevolve just like predator and prey," says William Rice of the University of California at Santa Cruz.

Rice and his student Brett Holland hoped to find out far fruit flies have gone in this arms race. Holland divided a laboratory population of flies into four subpopulations in which females lived in individual vials. In two of the subpopulations, each female shared a vial with three males, which competed in the usual way to fertilise her.

In the other two subpopulations, Holland forced the flies to be monogamous by putting only one male with each female. Under such conditions, males have nothing to gain by emphasising quantity over quality. "In this case, what's good for a female is good for her mate and vice versa. That should convert the arms race into a mutualistic interaction," says Rice.

After 34 generations, Holland measured the toxicity of the flies' seminal fluid by mating the males with females that were specially bred to be particularly sensitive to seminal fluid toxins. The females were 20 per cent less likely to die after a single mating with m
'"/>

Contact: Claire Bowles
claire.bowles@rbi.co.uk
44 171 331 2751
New Scientist
1-Jul-1998


Page: 1 2

Related biology news :

1. Monogamy appears to be unnatural in the natural world
2. Flies may taste bitter better, first map of insect tongue reveals
3. Flies offer clues to anesthesia-resistant memory
4. Scientists, Using Flies, Trace Genetic Links To Cancer
5. For Fruit Flies, Finding The Right Mate May Mean Offspring With A Longer Life Span, According To New Study
6. Two Modes Of Aging Discovered In Fruit Flies
7. Scientists Discover Two Modes Of Aging In Fruit Flies
8. UF Researchers Innovative Fence Helps Control Sand Flies
9. Drunken Fruit Flies Reveal Molecular Pathway Regulating Sensitivity To Alcohol
10. Fruit Flies May Shed Light On Cocaine Addiction
11. Two Parasitic Wasps Show Promise For Controlling Pest Flies

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Monogamy Has Its Rewards For Flies

(Date:7/30/2014)... protection from HIV infection could be as simple as ... , University of Washington bioengineers have discovered a ... protects women from contracting HIV. Their method spins the ... contact with moisture, releasing higher doses of the drug ... or creams. , "This could offer women a potentially ...
(Date:7/30/2014)... Long before humans figured out how to create colors, ... bright butterfly wings of many different hues, for example. ... a more environmentally friendly way to make colored plastics. ... and architectures of materials rather than dyes, to ... Letters . , N. Asger Mortensen, Anders Kristensen and ...
(Date:7/30/2014)... Steven Chown has been awarded the Scientific Committee ... in Antarctic Research. , SCAR, an inter-disciplinary international ... international scientific research in the Antarctic region, and ... the Earth system. The organisation also provides scientific ... responsible for governing the region. , The medal ...
Breaking Biology News(10 mins):Dissolvable fabric loaded with medicine might offer faster protection against HIV 2Dissolvable fabric loaded with medicine might offer faster protection against HIV 3
(Date:7/30/2014)... 30, 2014 Sales Horizons, a leader ... blended sales training programs for companies engaged in complex ... used by thousands of salespeople over 25 years in ... program can be customized to address the unique sales ... blended sales training program consists of two parts: ...
(Date:7/30/2014)... July 30, 2014 With the ... of personal health expenditure as well as the ... system, China diagnostic reagent industry has been developing ... 90%. In 2013, Chinese in vitro diagnostics market ... came from in vitro diagnostic reagents. , ...
(Date:7/30/2014)... BCC Research ( http://www.bccresearch.com ) reveals ... in Industrial Applications , the global market for industrial ... by 2018, registering a five-year compound annual growth rate ... recorded in the detergent enzyme segment with a CAGR ... has influenced almost every sector of industrial activity, ranging ...
(Date:7/30/2014)... July 30, 2014 Yuma Regional ... and complementary therapies brings comprehensive cancer care to ... Yuma Regional Cancer Center has officially opened. A ... program includes services such as open, semi-private and ... American Cancer Society Resource Center, hematology, rehabilitation center, ...
Breaking Biology Technology:Sales Horizons Launches New Blended Sales Training Programs to Companies Engaged in Complex B2B Sales 2Sales Horizons Launches New Blended Sales Training Programs to Companies Engaged in Complex B2B Sales 3China Diagnostic Reagent Industry Report, 2013-2016 | Researchmoz 2China Diagnostic Reagent Industry Report, 2013-2016 | Researchmoz 3Global Market for Industrial Enzymes to Reach Nearly $7.1 Billion by 2018; Detergent Enzyme Market to Record Maximum Growth 2Global Market for Industrial Enzymes to Reach Nearly $7.1 Billion by 2018; Detergent Enzyme Market to Record Maximum Growth 3Sate-of-the-Art Yuma Regional Cancer Center Officially Opens 2
Cached News: