請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/45985
標題: Prey Selection by Breeding Brown Dippers Cinclus pallasii in a Taiwanese Mountain Stream
作者: Chiu, M.C.
郭美華
Kuo, M.H.
Tzeng, C.S.
Yang, C.H.
Chen, C.C.
Sun, Y.H.
關鍵字: Aquatic insects
Birds
Bottom-up
Predation
Rivers
tits parus-major
american dippers
water-quality
river bird
body-size
foraging performance
population-density
invertebrate prey
nestling growth
aquatic insects
期刊/報告no:: Zoological Studies, Volume 48, Issue 6, Page(s) 761-768.
摘要: Ming-Chih Chiu, Mei-Hwa Kuo, Chyng-Shyan Tzeng, Cheng-Hsiung Yang, Chao-Chielh Chen, and YuanHsun Sun (2009) Prey selection by breeding Brown Dippers Cinclus pallasii in a Taiwanese mountain stream. Zoological Studies 48(6): 761-768. Optimal foraging theory predicts that prey selection by breeding birds is governed by tradeoffs among diverse prey types with different energy gains per unit energy expended. This is particularly so in central-place foragers such as dippers (Cinclidae), which must provision nest-bound young using prey gathered along a linear habitat. In this study, we examined changes in the dietary composition of nestling Brown Dippers Cinclus pallasii over the course of the nestling period in the mountainous Dajia River of central Taiwan. Prey preference was associated with prey morphological traits: fish and trichopterans, with relatively large body sizes, were the preferred prey items, while smaller prey such as ephemeropterans, plecopterans, and dipterans were least preferred. However, the nestling dietary composition significantly shifted over the 1st 1/2 of the nestling period, with the proportion of large prey and daily maximum prey size increasing as the nestlings grew. Our data suggest that the increasing energy demands of the nestlings are responsible for the increase in prey size, while nestling gape-size possibly limited the maximum prey size early in the nestling period. These results bear a striking similarity to data reported for other dipper species, implying identical constraints and strategies in nest provisioning. http://zoolstud.sinica.edu.tw/Journals/48.6/761.pdf
URI: http://hdl.handle.net/11455/45985
ISSN: 1021-5506
顯示於類別:昆蟲學系

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