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Microhabitat characteristics related to seasonal roost switching:implications from a threatened and introduced cockatoo species in an urban landscape

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Avian Research 2021年第3期12卷 317-326页

作者： Sifeng Wang L.M.Chu School of Life Sciences The Chinese University of Hong KongShatinNTHong Kong SARChina

Background:communal roosting is a common avian social behaviour,which potentially provides foraging benefits,predation avoidance or thermoregulation in *** identify the crucial environmental factors associated with roost site selection,most studies have focused on the comparison of physical characteristics between roosts and ***,the differences among roosts have usually been neglected and the causes of roost switching have seldom been ***:To explore the variations among roost sites and assess the most influential environmental factors related to seasonal roost switching,we conducted a 105-day observation on an introduced population of critically endan-gered Yellow-crested Cockatoo(Cacatua sulphurea)in an urban environment in Hong Kong from 2014 to *** identified seven roost sites that were occupied in different seasons and then measured their microhabitat character-istics in terms of land use types,human disturbance and microclimate *** quantify these differences,we used Pearson’s chi-squared test,partial least squares determinant analysis(PLS-DA)and one-way repeated measures ANOVA,***:Our results distinguished roost sites occupied in three seasons,***,summer and winter roosts,using several microhabitat *** land use types were significantly associated with roosts,where spring roosts were usually located in tree-dominated areas,which are the major feeding *** discriminant analysis on human disturbance variables indicated that summer roosts were positively associated with night *** microhabitat temperatures of winter roosts were significantly higher than those of most other roosts on cold ***:The results highlighted significant variations among roosts,and seasonal roost switching was likely driven by specific microhabitat characteristics of each roost site,such as *** also helps us understand the behavioural adaptation of birds to

关键词： communal roosting Human disturbance Land use Microclimate Seasonal variation

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