The painted redstart (Myioborus pictus L.) search rate of a cryptic versus conspicuous prey : a field test of optimal search models

• Autorzy: Jabłoński P.
• Języki publikacji: EN

Abstrakty

EN

Models of optimal search rates predict that predators increase the search rate when availability of conspicuous prey increases relative to cryptic prey. I tested this prediction by comparing foraging hop rates by 19 Painted Redstarts (Myioborus pictus) - insectivorous birds in Arizona, USA. Redstarts often use flashy displays of open wings and tail to flush their prey and to subsequently chase the prey in air. Such flush-displays make the prey conspicuous and easy to detect. Hence, foraging mode affects relative availability of conspicuous versus cryptic prey: birds foraging with frequent flush-displays encounter conspicuous prey more often then birds foraging with infrequent flush-displays. As predicted, the hop rates during foraging with infrequent flush-displays were lower than hop rates during foraging with frequent displays.

Słowa kluczowe

EN

flush-pursue; foraging; Myioborus pictus; search rates

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2003
• Tom: Vol. 51, nr 3
• Strony: 385--388
• Opis fizyczny: Bibliogr. 19 poz.,

Twórcy

autor

Jabłoński P.

• Institute of Ecology, PAS, Dziekanów Leśny, ul. Konopnickiej 1, 05-092 Łomianki, Poland,