رفتارهای جفت گیری در پرندگان. استاد :خانم دکتر محمودی

استاد :خانم دکتر محمودی
دانشجو: طلیعه شیرافکن
دانشگاه آزاد اسلامی واحد همدان
سالتحصیلی:88-89


Peafowl offer an excellent example of a feature display. Colorful iridescent eyelike ocelli are located on the highly elongated tail coverts; about 100-175 such ocelli may be present on a single adult male. These male displays are mostly frontally oriented to exhibit the ocelli maximally. In an observational study, Rands, Ridley, and Lelliot (1984) found that male peafowl that were reproductively successful were of intermediate age, did not have longer tails or greater body mass than other males, but they spent more time displaying sexually. Furthermore, the males with the most elaborate trains were typically most effective in attracting females (Petrie, Halliday, & Sander, 1991). Thus, the beautifully iridescen
Peafowl offer an excellent example of a feature display. Colorful iridescent eyelike ocelli are located on the highly elongated tail coverts; about 100-175 such ocelli may be present on a single adult male. These male displays are mostly frontally oriented to exhibit the ocelli maximally. In an observational study, Rands, Ridley,
and Lelliot (1984) found that male peafowl that were reproductively successful were of intermediate age, did not have longer tails or greater body mass than other males, but they spent more time displaying sexually. Furthermore, the males with the most elaborate trains were typically most effective in attracting females (Petrie, Halliday, & Sander, 1991). Thus, the beautifully iridescent ocelli of the peacock tail acts as a sexual stimulus for peahen. The Bulwer’s pheasant also signals females of sexual interest by displaying a fan of tail feathers. The stark white tail feathers contrast dramatically with the dark black feathers on the body
t ocelli of the peacock tail acts as a sexual stimulus for peahen. The Bulwer’s pheasant also signals females of sexual interest by displaying a fan of tail feathers. The stark white tail feathers contrast dramatically with the dark black feathers on the body

For female great frigate birds, the most powerful sexual stimulus comes in the form of an inflated red throat. Male frigate birds solicit females from a nest site by inflating a fleshy scarlet pouch beneath the throat. When a female is nearby, males accentuate their ballooning throats by spreading and vibrating their black wings. The kori bustard also inflates a throat pouch to attract females, however, the ballooning pouch is covered in long, wispy feathers rather than the brightly colored flesh of the frigate bird.
Courtship dances are another type of visual signal used to induce sexual behavior in potential mates. For instance, the sexual display of the great snipe male involves vigorous activity rather than ornamentation. When a female approaches a male, a male will shift his activity from territorial defensive behaviors to intense flutter-leaping near the female. Females of lekking