Navigation Links
In promiscuous antelopes, the 'battle of the sexes' gets flipped
Date:11/29/2007

In some promiscuous species, sexual conflict runs in reverse, reveals a new study published online on November 29th in Current Biology, a publication of Cell Press. Among African topi antelopes, females are the ones who aggressively pursue their mates, while males play hard to get.

The classical view of sexual conflict holds that males, for whom reproducing is cheap, will mate as much as possible. On the other hand, females, who must pay a heftier price, are choosier about their mating partners.

When biologists talk about the Battle of the Sexes, they often tacitly assume that the battle is between persistent males who always want to mate and females who dont, said Jakob Bro-Jrgensen of University of Jyvskyl in Finland. However, in topi antelopes, where females are known to prefer to mate with males in the center of mating arenas, weve found a reversal of these stereotypic sex roles.

Such role reversals may occur in species where females benefit from mating multiply, either because it increases their chances of conception with high-quality males or simply because it increases the probability that they conceive at all, Bro-Jrgensen added. He noted that this reversed sexual conflict might not be a rarity in the animal kingdom, as topi are in many ways a very typical mammalian species characterized by male mate competition and female choice.

In promiscuous speciesthose in which individuals mate with multiple partners within a short time periodBro-Jrgensens group suspected that females might sometimes have higher optimum mating rates than their mating partners. Topi antelope offered an ideal opportunity for studying the dynamics of sex roles in promiscuous mammals, Bro-Jrgensen said, because over a month and a half, individual females become receptive to mating for roughly one day, when they mate several times with each of about four males on average. Females prefer to mate with those males who have succeeded in acquiring territories in the center of mating arenas, known as leks. But the majority of females also mate with other males as well, resulting in intense sperm competition.

Indeed, they have now shown that aggressive female topis compete with one another for a limited supply of sperm from the most desirable members of the opposite sex, even attacking their fellow mating pairs. Meanwhile, resistant males grow choosier about their mating partners, deliberately selecting the least mated females and launching counterattacks against aggressive females with whom theyve already mated.

The bottom-line of the findings, according to Bro-Jrgensen: We should not regard coyness as the only natural female sex role just as we should not expect that it is always the natural male sex role to mindlessly accept any mating partner, he said. Nature favors a broader range of sex roles.


'/>"/>

Contact: Cathleen Genova
cgenova@cell.com
617-397-2802
Cell Press
Source:Eurekalert

Related biology news :

1. Older climbers face uphill battle on Mount Everest
2. Amber specimen captures ancient chemical battle
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/28/2016)... First quarter 2016:   , Revenues amounted ... quarter of 2015 The gross margin was 49% (27) ... the operating margin was 40% (-13) Earnings per share ... operations was SEK 249.9 M (21.2) , Outlook   ... M. The operating margin for 2016 is estimated to ...
(Date:4/26/2016)... , April 27, 2016 ... the  "Global Multi-modal Biometrics Market 2016-2020"  report to ... ) , The analysts forecast the ... CAGR of 15.49% during the period 2016-2020.  ... number of sectors such as the healthcare, BFSI, ...
(Date:4/15/2016)... 15, 2016  A new partnership announced today ... underwriting decisions in a fraction of the time ... and high-value life insurance policies to consumers without ... With Force Diagnostics, rapid testing (A1C, Cotinine and ... (blood pressure, weight, pulse, BMI, and activity data) ...
Breaking Biology News(10 mins):
(Date:5/27/2016)... City, Missouri (PRWEB) , ... May 27, 2016 , ... ... Development Manager, Turf and Ornamental Products. , In his 15-year career with PBI-Gordon, Dave ... Herbicide Product Manager, where he was integral in the development and launch of many ...
(Date:5/27/2016)... NEW YORK , May 27, 2016 ... state, but investors playing in this space know that volatility ... this morning,s featured companies on ActiveWallSt.com: Synta Pharmaceuticals Corp. (NASDAQ: ... CTIC ), Lpath Inc. (NASDAQ: LPTN ), and ... now and gain access to the technical alerts for these ...
(Date:5/26/2016)... , May 26, 2016 Q BioMed ... it will be a featured presenter at the 5th Annual ... New York City at the Grand Hyatt ... , Q BioMed Inc. CEO, is scheduled to begin at ... the company,s business strategy, recent developments and outline milestones for ...
(Date:5/26/2016)... ... 26, 2016 , ... Kinder Scientific (KinderScientific.com), a leading animal ... the Company for the future. Kinder Scientific announces restructured ownership and additional ... appointed Chairman of the Board, Curtis D. Kinghorn has been appointed CEO/President and ...
Breaking Biology Technology: