Are vigilance sequences a consequence of intrinsic chaos or external changes?
Article Abstract:
Vigilance behaviour in preening crested terns, Sterna bergii, in their natural environment was observed, and predictability was found to decay as the time over which the prediction is made increases. This change is not interpreted as being due to chaotic signal generation, but is due to a response by the bird to external events. It is argued that coordination of vigilance patterns is unlikely, and that only short term information about prey vigilance behaviour is likely to be used by predators.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1999
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Group size and anti-predator vigilance: a simple model requiring limited monitoring of other group members
Article Abstract:
A study on birds shows that individual vigilance time is reduced with an increase in group size. Individuals can reduce their vigilance time without increasing the predation risk by observing the behavior of others in the group. According to S.L. Lima's "many eyes" hypothesis, an increase in the group size increases the scanning for predators. Various aspects of this hypothesis and the results of subsequent studies on the topic are discussed.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1996
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Experimental design: minimizing suffering may not always mean minimizing number of subjects
Article Abstract:
Unbalanced experimental designs should be applied for researches in which experimental manipulation evidently leads to greater stress in examining subjects. The approach minimizes the number of individuals in the high-stress group, while maintaining the effectivity of the investigation for statistically significant outcomes. However, it requires a higher number of subjects which is not always feasible due to certain experimental constraints.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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