News tagged with sex ratios
Early spring means more bat girls
There must be something in the warm breeze. A study on bats by a University of Calgary researcher suggests that bats produce twice as many female babies as male ones in years when spring comes early.
May 05, 2012 |
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Cameras show 35 rare rhinos in Indonesia: official
Hidden cameras in the jungles of Indonesia's Java island have captured images of 35 critically endangered Javan rhinos, including five calves, an official said Friday.
Dec 30, 2011 |
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Family composition determines success of great tit parents
Great tits who have as many sons as daughters acquire more grandchildren than great tits with an uneven family composition. That is because their children are reproductively more successful concludes NWO researcher Reinder ...
Dec 19, 2011 |
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The unstable future of a world full of men
As the global population hits seven billion, experts are warning that skewed gender ratios could fuel the emergence of volatile "bachelor nations" driven by an aggressive competition for brides.
Other Sciences / Social Sciences
Oct 26, 2011 |
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Manipulative mothers subdue show-off sons
The gaudy plumage and acrobatic displays of birds of paradise are a striking example of sexual selection, Charles Darwin's second great theory of evolution. But new research shows that this powerful process may collapse when ...
Sep 12, 2011 |
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Has China's campaign against female feticide done more harm than good?
Why are female foetuses aborted in China? Boys are considered a greater asset for farming, but why has the number of families in the cities who want a boy at any cost doubled?
Other Sciences / Social Sciences
Jun 13, 2011 |
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Millions of girls lost to selective abortion in India: study
Sex selection of foetuses in India has led to 7.1 million fewer girls than boys up to age six, a gender gap that has widened by more than a million in a decade, according to a study released Tuesday.
May 24, 2011 |
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The impact of sex selection and abortion in China, India and South Korea
In the next 20 years in large parts of China and India, there will be a 10% to 20% excess of young men because of sex selection and this imbalance will have societal repercussions, states an analysis in CMAJ (Canadian Medical A ...
Mar 14, 2011 |
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Competing for a mate can shorten lifespan
"Love stinks!" the J. Geils band told the world in 1980, and while you can certainly argue whether or not this tender and ineffable spirit of affection has a downside, working hard to find it does. It may even shorten your ...
Aug 09, 2010 |
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Rainfall linked to skewed sex ratios
An increased proportion of male African buffalo are born during the rainy season. Researchers writing in the open access journal BMC Evolutionary Biology collected data from over 200 calves and 3000 foetuses, finding that r ...
Apr 22, 2010 |
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A boy for every girl? Not even close
In a perfect world, for every boy there would of course be a girl, but a new study shows that actual sex ratios can sometimes sway very far from that ideal. In fact, the male-to-female ratio of one tropical butterfly has ...
Sep 10, 2009 |
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Selective sex abortion causes 32 million excess males in China
Selective abortion in favour of males has left China with 32 million more boys than girls, creating an imbalance that will endure for decades, an investigation released on Friday warned.
Apr 10, 2009 |
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