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小乌贼有大智慧 靠大精子PK大乌贼

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小编摘要:小乌贼由于体型小,在争取母乌贼的青睐时总不得志,因为大乌贼体型大,进攻力强,总是将母乌贼据为己有。为保证后代的繁衍,小乌贼会产生体积稍大的精子。

导读:小乌贼由于体型小,在争取母乌贼的青睐时总不得志,因为大乌贼体型大,进攻力强,总是将母乌贼据为己有。为保证后代的繁衍,小乌贼会产生体积稍大的精子。这是生物竞争的一种体现,是为了生存而改进自身的一种体现。

Smaller squid make up for their diminutive size, and reduced sexual status, by producing bigger sperm.

They produce the outsized sperm in a bid to thwart the chances of larger male squid rivals impregnating females.

While the smaller males are unable to compete with the larger males, their sperm can.

Scientists based in Japan made the discovery studying spear squid, otherwise known as Bleeker's squid (Loligo bleekeri).

Details are published in the journal BMC Evolutionary Biology.

Male spear squid employ one of two tactics when seeking to pair with a mate.

Larger males, known as "consorts", court females by flashing bright displays of colour across their bodies.

They compete with other large males and the winner mates with the female, depositing sperm in a package inside her oviduct.

He then guards her until she spawns her eggs.

Smaller males however, employ a different tactic.

These so-called "sneaker" males don't advertise themselves and show few of the behaviours of their larger rivals.

Instead, they wait until a larger male is guarding a female, then rush in head first to copulate with her.

A sneaker male mates in a head-to-head position and deposits his sperm in a different place to the larger males, putting his sperm package on the outside of the female's body just below her mouth.

The timing of this intervention is crucial.

The smaller male dashes in just as the female begins laying her eggs, in the hope that they will pass over his sperm and be fertilised by him rather than the female's original suitor.

The species is unusual in another way however.

These smaller males produce different sperm to the larger males.

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2011-08-10 19:37 编辑:Day_Day_Up1990
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