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  1. #1
    Good Enough Phatie's Avatar
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    Default Size Does Matter w/ Promiscuous Females

    Size Does Matter in Bats' Evolution
    AP ^ | Jan 24, 2006 | WILLIAM KATES

    http://news.yahoo.com/s/ap/20060124/ap_on_sc/bat_brains

    A research team led by Syracuse University biologist Scott Pitnick, pictured in Syracuse, N.Y., Monday, Jan. 9, 2006, found that in bat species where the females are promiscuous, the males boasting the largest testicles also had the smallest brains. Conversely, where the females were faithful, the males had smaller testes and larger brains. (AP Photo/Kevin Rivoli)

    SYRACUSE, N.Y. - For some male bats, sexual prowess comes with a price — smaller brains. A research team led by Syracuse University biologist Scott Pitnick found that in bat species where the females are promiscuous, the males boasting the largest testicles also had the smallest brains. Conversely, where the females were faithful, the males had smaller testes and larger brains.

    "It turns out size does matter," said Pitnick, whose findings were published in December in "Proceedings of the Royal Society: Biological Science," an online journal.



    The study offers evidence that males — at least in some species — make an evolutionary trade-off between intelligence and sexual prowess, said David Hoskens, a biologist at the Centre for Ecology and Conservation at the University of Exeter in England and a leading authority on bats' mating behavior.

    "Bats invest an enormous amount in testis, and the investment has to come from somewhere. There are no free lunches," said Hoskens, who did not participate in the study.

    The relationship between the breeding system and relative brain size has received little investigation, said Pitnick, who teaches evolution and population biology and researches topics such as sexual selection and sexual conflict.

    Bats are the second largest group of mammals (behind rodents) with about 1,000 known species. Because of their exceptional navigational and flying abilities, bats have been the subject of countless studies, providing Pitnick and his colleagues — Kate Jones of Columbia University and Gerald Wilkinson of the University of Maryland — with a bounty of data without having to slink off into caves.

    Pitnick's team looked at 334 species of bats and found a convincing contrast in testes size. In species with monogamous females, males had testes starting at 0.11 percent of their body weight and ranging up to 1.4 percent. But in species where the females had a large number of mates, Pitnick found testes ranged from 0.6 percent to 8.5 percent of the males' mass (in the Rafinesque's big-eared bat).

    "If female bats mate with more than one male, a sperm competition begins," Pitnick said. "The male who ejaculates the greatest number of sperm wins the game, and hence many bats have evolved outrageously big testes."

    Promiscuity is known to make a difference in testicle size in some other mammals. For example, chimpanzees are promiscuous and have testicles that are many times larger than those of gorillas, in which a single dominant male has exclusive access to a harem of females.

    Large brains, meanwhile, are metabolically costly to develop and maintain. Pitnick's research suggested that in those bat species with promiscuous females, the male's body used more of its energy to enhance the testes — giving it the greater adaptive advantage — and lacked the energy it needed to further develop the brain.

    The study found that in more monogamous species, the average male brain size was about 2.6 percent of body weight, while in promiscuous species, the average size dipped to 1.9 percent.

    ___

    On the Net:

    The Royal Society: http://www.pubs.royalsoc.ac.uk
    Last edited by Phatie; 01.24.06 at 08:33 PM.

  2. #2
    Sinner's Swing! Darkstar's Avatar
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    Somebody needs to break the news gently to OLO......well hung bats are stupid.............
    Love should NOT be work, it should be as easy as breathing Dave's Dreidel

    My god, our government has less secrets than Van Halen. Emperor Brett

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  3. #3
    PM Goo with your concerns OLO's Avatar
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    12.12.17 @ 10:08 PM
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    My penis is very average.
    ((Just My Two Cents))
    And thats about what its worth.

  4. #4
    Good Enough Phatie's Avatar
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    Quote Originally Posted by OLO
    My penis is very average.
    Olo, how big is your Bat?

  5. #5
    PM Goo with your concerns OLO's Avatar
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    12.12.17 @ 10:08 PM
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    2 inches long and 5 inches wide. Its shaped like a can of soup on its side.
    ((Just My Two Cents))
    And thats about what its worth.

  6. #6
    Eruption blacknblue's Avatar
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    09.13.06 @ 09:37 PM
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    Size matters, but skill matters even more. Particularly skill with multiple body parts. Oh, and endurance! I'd rate them in this order:

    Skill with multiple body parts
    Endurance
    Skill with the one body part
    Size
    Last edited by blacknblue; 01.24.06 at 09:11 PM.
    Honey, I ain't through with you!

    GO ILLINI!!!!!!!

  7. #7
    Good Enough Phatie's Avatar
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    Quote Originally Posted by OLO
    2 inches long and 5 inches wide. Its shaped like a can of soup on its side.
    A can-o- Cream of Sumyungboy ?
    Last edited by Phatie; 01.24.06 at 09:36 PM.

  8. #8
    Sinner's Swing! Darkstar's Avatar
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    Quote Originally Posted by OLO
    2 inches long and 5 inches wide. Its shaped like a can of soup on its side.
    Uh......dude, that doesn't qualify for average.....
    Love should NOT be work, it should be as easy as breathing Dave's Dreidel

    My god, our government has less secrets than Van Halen. Emperor Brett

    I'm a Democrat and an Atheist, but I've yet to receive my ticket to Hell. Is this something I call Live Nation about or what? JakeK21

    I feel it takes far more energy to hate than love. Well outside of Obamacare, How Many Say I and Heineken beer. ziggysmalls

  9. #9
    Baluchitherium mistere's Avatar
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    Wait. I wanna talk about my cock.

  10. #10
    Sinner's Swing! Darkstar's Avatar
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    Quote Originally Posted by mistere
    Wait. I wanna talk about my cock.

    I'm sure the women are waiting!!
    Love should NOT be work, it should be as easy as breathing Dave's Dreidel

    My god, our government has less secrets than Van Halen. Emperor Brett

    I'm a Democrat and an Atheist, but I've yet to receive my ticket to Hell. Is this something I call Live Nation about or what? JakeK21

    I feel it takes far more energy to hate than love. Well outside of Obamacare, How Many Say I and Heineken beer. ziggysmalls

  11. #11
    Eruption blacknblue's Avatar
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    Quote Originally Posted by Darkstar
    I'm sure the women are waiting!!
    If you're not incredibly talented with it and can go on and on, we don't really care.
    Honey, I ain't through with you!

    GO ILLINI!!!!!!!

  12. #12
    Sinner's Swing! Darkstar's Avatar
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    Quote Originally Posted by blacknblue
    If you're not incredibly talented with it and can go on and on, we don't really care.
    Ah cmon, be a darlin' and humor him!
    Love should NOT be work, it should be as easy as breathing Dave's Dreidel

    My god, our government has less secrets than Van Halen. Emperor Brett

    I'm a Democrat and an Atheist, but I've yet to receive my ticket to Hell. Is this something I call Live Nation about or what? JakeK21

    I feel it takes far more energy to hate than love. Well outside of Obamacare, How Many Say I and Heineken beer. ziggysmalls

  13. #13
    Baluchitherium mistere's Avatar
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    Default OK, I was kidding, but because it is my favorite subject...

    It's gotta nice curve like a banana.
    And also like a banana, goes good with your pudding.

  14. #14
    Eruption blacknblue's Avatar
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    Quote Originally Posted by mistere
    It's gotta nice curve like a banana.
    And also like a banana, goes good with your pudding.
    Sounds yummy! Is it a small banana or a big banana?

    I'm just asking cause don't bats like fruit?
    Last edited by blacknblue; 01.25.06 at 11:56 AM.
    Honey, I ain't through with you!

    GO ILLINI!!!!!!!

  15. #15
    Eruption Kevy5150's Avatar
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    The human penis has a mind of it's own.
    Respects.

 

 

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