TY - JOUR
T1 - Nonrandom pattern of vigilance by preening black-headed gulls
AU - Novčić, Ivana
AU - Vidović, Zoran
AU - Hauber, Mark E.
N1 - We thank two anonymous reviewers for helpful comments on the manuscript. This study was supported by the Ministry of Education, Science and Technological Development of Serbia. MEH was supported by the University of Illinois Center for Advanced Study and the Wissenschaftskolleg zu Berlin.
PY - 2022
Y1 - 2022
N2 - Classic models of vigilance assume instantaneous and sequential randomness in the scanning process, implying negative exponential distribution of interscan durations and no interdependence among successive interscans. We examined whether vigilance pattern by preening black-headed gulls, Chroicocephalus ridibundus, meets these assumptions. Out of 54 behavioural sequences, 50 departed from the expected negative exponential distribution, whereas the focal interscan duration was significantly affected by the interaction of the preceding scan and the interscan interval. These results reveal departures from randomness in the scanning process by gulls, which may be a consequence of the hunting strategies of their predators or due to the trade-off between the needs for feather maintenance and antipredator vigilance.
AB - Classic models of vigilance assume instantaneous and sequential randomness in the scanning process, implying negative exponential distribution of interscan durations and no interdependence among successive interscans. We examined whether vigilance pattern by preening black-headed gulls, Chroicocephalus ridibundus, meets these assumptions. Out of 54 behavioural sequences, 50 departed from the expected negative exponential distribution, whereas the focal interscan duration was significantly affected by the interaction of the preceding scan and the interscan interval. These results reveal departures from randomness in the scanning process by gulls, which may be a consequence of the hunting strategies of their predators or due to the trade-off between the needs for feather maintenance and antipredator vigilance.
KW - Chroicocephalus ridibundus
KW - Poisson process
KW - antipredator behaviour
KW - scanning
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U2 - 10.1163/1568539X-bja10167
DO - 10.1163/1568539X-bja10167
M3 - Article
AN - SCOPUS:85130044556
SN - 0005-7959
VL - 159
SP - 1101
EP - 1114
JO - Behaviour
JF - Behaviour
IS - 12
ER -