News tagged with sperm competition
Life-history traits may affect DNA mutation rates in males more than in females
For the first time, scientists have used large-scale DNA sequencing data to investigate a long-standing evolutionary assumption: DNA mutation rates are influenced by a set of species-specific life-history ...
Jun 13, 2011 |
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Inbred sperm fertilize fewer eggs: research
Inbred male sperm have been found to fertilise fewer eggs when in competition with non-inbred males according to a new study by the University of East Anglia.
Jun 15, 2010 |
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Unattractive guppies have better sperm
(PhysOrg.com) -- Scientists studying tropical guppies have discovered that the less colorful and attractive males have better quality sperm, while the attractive fish invest in their appearance at the expense ...
Jun 07, 2010 |
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Females shut down male-male sperm competition in leafcutter ants
Leafcutter ant queens can live for twenty years, fertilizing millions of eggs with sperm stored after a single day of sexual activity.
Mar 18, 2010 |
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Battle of the sexes offers evolutionary insights
In a paper published May 3, in the journal Evolution, University of Cincinnati graduate student Karl Grieshop and Michal Polak, associate professor of biological sciences at UC, examine the role of genita ...
May 03, 2012 |
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European dung-fly females all aflutter for large males
European and North American black scavenger flies – also called dung flies as their larvae develop in the feces of vertebrates and thus break them down – belong to the same species. Nevertheless, ...
Apr 13, 2012 |
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Evolution revolution
Developments in evolutionary biology have a significant impact on the way we look at the world and ourselves in it, according to a conservation scientist who will be speaking on the subject at Cambridge University’s ...
Mar 26, 2012 |
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Study of diving beetles suggest sperm evolution may be driven by changes in female reproductive organs
Studying female reproductive tracts and sperm in diving beetles (Dytiscidae), researchers from the University of Arizona and Syracuse University have obtained a glimpse into a bizarre and amazing world of spe ...
Feb 06, 2012 |
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Sex-specific behaviors traced to hormone-controlled genes in the brain
Hormones shape our bodies, make us fertile, excite our most basic urges, and as scientists have known for years, they govern the behaviors that separate men from women. But how?
Feb 02, 2012 |
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Bottom of the swimming league: Naked mole rat sperm
Naked mole rats (Heterocephalus glaber) live in a 'hive' society with one reproducing queen and between one and three reproducing males. The rest of the mole rats in the colony are workers either defending the bu ...
Dec 05, 2011 |
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Polyandry drives increased embryo viability
An experimental evolutionary study on house mice (Mus musculus) has found multiple mating is beneficial for both males and females.
Nov 24, 2011 |
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Gouldian Finch females maximize mating opportunities
The endangered Gouldian Finch (Erythrura gouldiae) has peculiar mating habits that allow the species’ females to maximise fertility.
Oct 25, 2011 |
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Sexy sons thanks to mom
It is not the superior genes of the father, but the mother's resource investment in the eggs that makes Zebra Finch males particularly attractive. A Swiss-Australian research team lead by evolutionary ecologists ...
Sep 29, 2011 |
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Sexy snacks: Study finds female mate searching evolves when mating gifts are important
In the animal world, males typically search for their female partners. The mystery is that in some species, you get a reversal -- the females search for males.
Sep 28, 2011 |
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