Behavioural responses of young cape gannetsSula capensisto high ambient temperatures
作者:
J. Cooper,
W. R. Siegfried,
期刊:
Marine Behaviour and Physiology
(Taylor Available online 1976)
卷期:
Volume 3,
issue 4
页码: 211-220
ISSN:0091-181X
年代: 1976
DOI:10.1080/10236247609378512
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A young Cape GannetSula capensisresponded to high ambient temperatures in the laboratory by standing, gular fluttering with raised head and open bill, wing drooping, defaecating at a fast rate close to or onto the feet, “paddling”; in the excreta, and increased breathing rate. Standing initially caused a decline in foot temperature which rose with rising ambient temperature. Gular flutter and wing drooping assisted the bird in tolerating heat stress. Reduction in heat‐load occurred when standing on a wet surface, presumably due to evaporative heat loss (of excreta on the feet = urohidrosis) and an enhanced conduction of heat to substrate. Field observations confirmed that young Cape Gannets defaecate onto their feet at high ambient temperatures. This species appears preadapted for this behaviour since it builds a solely guano nest, defaecating onto the rim which is compacted by “paddling”;.
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