| ²é¿´: 1454 | »Ø¸´: 3 | |||||
qingnian20½ð³æ (ÕýʽдÊÖ)
|
[½»Á÷]
SCIÎÄÕÂÖÐÒýÊö±ðÈ˹۵㳣Óôʻã ÒÑÓÐ2È˲ÎÓë
|
|
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÷ |
» ÊÕ¼±¾ÌûµÄÌÔÌûר¼ÍƼö
Ó¢ÎÄÂÛÎÄд×÷Ͷ¸å·½·¨Óë¼¼ÇÉ»ã×Ü | ¹ØÓÚд×÷ |
» ²ÂÄãϲ»¶
Ò»Ö¾Ô¸ÖØÇì´óѧ085700×ÊÔ´Óë»·¾³×Ü·Ö308Çóµ÷¼Á
ÒѾÓÐ3È˻ظ´
Äϲý´óѧ²ÄÁÏר˶311·ÖÇóµ÷¼Á
ÒѾÓÐ6È˻ظ´
316Çóµ÷¼Á
ÒѾÓÐ6È˻ظ´
346Çóµ÷¼Á[0856]
ÒѾÓÐ7È˻ظ´
һ־Ըɽ´ó07»¯Ñ§ 332·Ö ËÄÁù¼¶Òѹý ±¾¿ÆÉ½¶«Ë«·Ç Çóµ÷¼Á£¡
ÒѾÓÐ3È˻ظ´
310Çóµ÷¼Á
ÒѾÓÐ3È˻ظ´
»úеר˶299Çóµ÷¼ÁÖÁ²ÄÁÏ
ÒѾÓÐ4È˻ظ´
070300»¯Ñ§319Çóµ÷¼Á
ÒѾÓÐ7È˻ظ´
08¹¤¿Æ 320×Ü·Ö Çóµ÷¼Á
ÒѾÓÐ6È˻ظ´
Ò»Ö¾Ô¸Ìì½ò´óѧ»¯Ñ§¹¤ÒÕרҵ£¨081702£©315·ÖÇóµ÷¼Á
ÒѾÓÐ12È˻ظ´
» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:
SCIÎÄÕÂÖÐÒýÊö±ðÈ˹۵㳣Óôʻã
ÒѾÓÐ30È˻ظ´

![]() ![]() |
2Â¥2012-01-31 22:49:51
frank213
ľ³æ (Ö°Òµ×÷¼Ò)
- Ó¦Öú: 164 (¸ßÖÐÉú)
- ½ð±Ò: 2615.3
- É¢½ð: 932
- ºì»¨: 1
- ɳ·¢: 2
- Ìû×Ó: 3804
- ÔÚÏß: 106.4Сʱ
- ³æºÅ: 814415
- ×¢²á: 2009-07-23
- ÐÔ±ð: GG
- רҵ: µ°°×ÖÊ×éѧ

3Â¥2012-01-31 22:50:27
leiws
ÖÁ×ðľ³æ (Ö°Òµ×÷¼Ò)
ľ³æÀË×Ó
- Ó¦Öú: 327 (´óѧÉú)
- ½ð±Ò: 20407
- É¢½ð: 1872
- ºì»¨: 62
- Ìû×Ó: 3922
- ÔÚÏß: 2137.9Сʱ
- ³æºÅ: 832300
- ×¢²á: 2009-08-22
- ÐÔ±ð: GG
- רҵ: ´ß»¯»¯Ñ§

4Â¥2012-01-31 22:50:59













»Ø¸´´ËÂ¥


ÄãÕâÀïµÄûÓùý¼¸ÖÖ...
40