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Rosenthal and Evans used playbacks of video animations to show that females did not exhibit a preference between a swordless male and a sworded male if the total body length of the two were equal. ×î³£¼ûµÄÒýÊö¹ÛµãµÄ´Ê»ã Much of the research in sexual selection in the last two decades has examined how a female¡¯s preference that does not influence her immediate reproductive success can still evolve if it is genetically correlated with another character under direct selection. Examined µ÷²é£¬Ñо¿¡£²»ÒªÃ¿´Îдµ½Ñо¿Ê±×ÜÓÃstudy£¬¿ÉÒÔÓÃЩÆäËüµÄ´Ê»ã£¬±ÈÈçexamine£¬±ÈÈçwork¡£ Two hypotheses for female preference evolution¡ªrunaway sexual selection and good genes selection¡ªstate that preferences evolve indirectly because they are genetically correlated with male traits that are under direct selection; that is, the preferences themselves are not under direct selection. State ÉùÃ÷¡£ÔÚÒýÊö±ðÈ˵Ĺ۵ãʱ£¬Èç¹û²»ÄÜÍêȫͬÒ⣬ʹÓÃstate ±Èshow¸ü¼ÓÖÐÁ¢Ð©¡£ Studies of receiver biases suggest that such analogies might not be broadly applicable. ÓÖÒ»ÖÖ½ÏΪ¿Í¹ÛµÄÒýÊö¹ÛµãµÄ±í´ï·½·¨¡£ Burley argued that the preference for red beaks is adaptive because it indicates male health, and this preference is then transferred to leg-band color. Ö¤Ã÷¡£ According to the anti-monotony hypothesis, habituation plays an important role in the evolution of complex vocalizations in songbirds: Increased song complexity reduces habituation of neighboring males and courting females. ¸ù¾Ý¡ Previous studies of acoustic and bioluminescent interactions had emphasized potential advantages to group-signaling organization, such as minimizing predation, preserving species-specific signal characters, or increasing the attractiveness of the group. ´øÓÐССµÄÇ¿µ÷ |
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2Â¥2012-01-31 22:49:51
frank213
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3Â¥2012-01-31 22:50:27
leiws
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4Â¥2012-01-31 22:50:59













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