RITUALIZED AGGRESSION AND UNSTABLE DOMINANCE IN BROODS OF CRESTED IBIS (NIPPONIA NIPPON)

XINHAI LI; DIANMO LI; ZHIJUN MA; TIANQING ZHAI; HUGH DRUMMOND

doi:10.1676/02-079

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XINHAI LI,^* DIANMO LI,^* ZHIJUN MA,^** TIANQING ZHAI,^*** HUGH DRUMMOND^****,*****

^*State Key Lab. of Integrated Management of Pest Insects and Rodents, Inst. of Zoology, Chinese Academy of Sciences, Beijing 100080, China
^**Inst. of Biodiversity, Fudan Univ., Shanghai 200433, China
^***Crested Ibis Conservation Station, Yang County 723300, Shaanxi Province, China
^****Inst. de Ecología, Univ. Nacional Autónoma de México, A.P. 70-275, 04510 D.F., México
^*****Corresponding author; hugh@servidor.unam.mx

Abstract

In broods of Crested Ibis (Nipponia nippon), aggressive dominance was unstable over time, even within feeding sessions. All chicks took turns pecking aggressively while broodmates hung their heads submissively, although roles were contested at the start of feeding bouts when chicks were 11–17 days old. In all broods, at least half of all pecks were false pecks, which did not strike broodmates even when within reach. False pecks seem to be ritualized displays that function to solicit food from parents and possibly to threaten rivals.

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XINHAI LI, DIANMO LI, ZHIJUN MA, TIANQING ZHAI, and HUGH DRUMMOND "RITUALIZED AGGRESSION AND UNSTABLE DOMINANCE IN BROODS OF CRESTED IBIS (NIPPONIA NIPPON)," The Wilson Bulletin 116(2), 172-176, (1 June 2004). https://doi.org/10.1676/02-079

Received: 9 July 2002; Accepted: 1 March 2004; Published: 1 June 2004

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