Testing for patterns in sequences of vigilance behaviour
Article Abstract:
In response to Matthew Kramer and William Bell's article it is argued that findings of their theoretical approach to examine vigilance sequences are similar to the findings of autocorrelation method. Taking the differences between values as the parameter of interest is biologically and statistically justified because drifting of the mean inter-scan interval during vigilance sequence suggests that an animal continually adjusts its vigilance to the environment. Since differenced series concerns comparison, autoregression parameters mean that increase in ISI will probably be followed by a decrease.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1996
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Why individual vigilance declines as group size increases
Article Abstract:
The explanation of group size effect in reducing individual vigilance is unclear. According to the many eyes hypothesis, individuals reduce their vigilance by relying on the vigilance of other group members. An alternative possibility suggests that if individual vigilance declines with reduced individual predation risk, the group size effect may be the result of reduced individual risk at higher group sizes. The existing evidence may be interpreted in terms of both the hypotheses.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1996
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A real-time response of vigilance behaviour to changes in group size
Article Abstract:
The vigilance behaviour of preening crested terns, Sterna bergii, depends on the flock size. With a reduced number of terns in the flock, the inter-scan intervals decrease leading to faster scanning and thereby increased vigilance. The inter-scan intervals lengthen with an increase in the flock size which causes decrease in the vigilance. The scan duration is independent of the flock size.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1995
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