Sunday, December 26, 2010

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Fish "ugly" have better sperm

Here we go with the first official blog entry!

A study conducted recently guppy (Poecilia reticulata ), Australian scientists have found evidence that less attractive males have a better quality of sperm. The research is published in the journal Proceedings of the Royal Society B. This paper shows that the most striking examples and brighter colors and exuberant "invest" in their appearance sacrificing their fertility.

In polyandry, when a female mates with multiple males, the reproductive success of a male depends on his ability to get sexual partners and the capacity of their sperm to compete effectively to achieve fertilization. Scientists from the Evolutionary Biology Centre, University of Western Australia decided to study how to compensate for these two characteristics in males of the guppy fish from Central America and known for its high rate of reproduction.

guppy fish to mate the males often carry out behaviors ranging from courtship "dance ritual" to a mating "stealth" no consensus. Comparing the genetic variation in dogs with behaviors that they had discovered that males who preferred to carry out the sneak mating were less conspicuous and were less ornate than those performing courtship to mate. However, less attractive specimens had better quality sperm, swim faster than their sperm.

Poecilia reticulata

According to Professor Jonathan Evans, director of research, these findings support the theory of sperm competition, "which holds that females mate with multiple males and sperm quality and speed of their sperm will determine what will be the father of her offspring.

"The reproductive advantage enjoyed by more attractive males could potentially be offset by the poor performance of your ejaculate for sperm competition "

Jonathan Evans says.

For a story that when I read it I was very surprised. We see in the next session of curiosities!

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