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- The Miracle of Copulating Late
By purepedantry on October 25, 2006.
Hot. This is article is too funny:
From bonobo chimpanzees to fruit flies, many female animals mate with multiple partners that often queue up for the event. Studies have shown that the the last male to mate with a female is the most successful at impregnating her. Nobody has understood why.
The last male can take advantage of a more "sperm-friendly" environment created by males that have copulated before him, according to a new model put forth by David Hosken and David Hodgson of the University of Exeter in the United Kingdom.Males ejacul*te hundreds of millions of sperm into the female reproductive tract, but most don't make it to the egg for fertilization. In mammals, just .001 percent of the ejacul*ted sperm hit the fertilization target.
"We know that the reproductive tract in females can be a nasty place for sperm," Hodgson told LiveScience. The acidity can kill many sperm, and scientists think some females' immune systems attack sperm as a "foreign object."
The seminal fluid in a male's ejacul*te helps to buffer the acidity, creating more viable conditions for sperm. By waiting in line, males could exploit the ejacul*te from other males, giving their sperm a cushy ride into the female's uterus to fertilize eggs.
...
You might think alpha males would exploit this strategy. But Hodgson said there are many sneaky males in the animal kingdom, such as red deer, that lurk just on the outskirts of a mating arena. Some are weaker than alpha males. "They're like spies, and they rush in whenever they get the chance and inseminate the female," he said.
The finding seems to apply to any organism in which females mate with multiple partners in rapid succession, out in the open where others can watch. The mating needs to be relatively rapid for the physical effects of a prior male's sperm to remain.
This includes females of many fruit-fly species, which re-mate within an hour. The male yellow dung fly will interrupt and take over a copulation, removing and replacing their rivals.
As for human examples, Hodgson said he couldn't think of any. (Emphasis mine.)
Hahahaha!!!! No comment. This article doesn't need any of my help.
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You think that was hilarious? Try this on for kicks ...
Multiunit recording of cerebellar cortex during training for sexual experience in male rats by J. Manzo, R. Garcia, S. Magana, L. I. Garcia, R. Toledo, M. E. Hernandez
Inst Neuroetologia, Univ Veracruzana, Xalapa, Mexico
They haven't published yet, but they did have a poster @ SfN. And as an annual stunt in my neuro dept we come back home and present "the coolest poster @ SfN" guess what i presented? Yeah, the 40Hz gamma band seen in the cerebellum that stays strong throughout male rat copulation. The extrapolation of this data? An electrode instead of Viagra.
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