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Seasonal influence on the diurnal roosting behaviour of free-ranging Indian flying fox Pteropus giganteus in an urban landscape, India

Indian flying fox Pteropus giganteus (Brünnich, 1782) is one of the largest fruit bats (Pteropodidae) in the world. However, studies on seasonal variations and influence of weather parameters on diurnal roosting of this species in urban areas are almost non-existent. We carried out this study in a major urban landscape of India to determine which weather parameters influence diurnal roosting behaviours of Indian flying fox. Behavioural data was assessed through scan sampling method. Sleeping, thermoregulatory, locomotion and communicative behaviour, all of which varied significantly, showing highest incidences of sleeping followed by thermoregulatory, locomotion and communicative behaviours. Sleeping was negatively related with thermoregulatory, locomotion and communicative behaviours; thermoregulatory behaviour was positively related with locomotion and locomotion with communicative behaviour. Except sleeping, all other behaviours were positively related to temperature and were higher in summer than winter. Cloud cover negatively influenced sleeping and positively influenced thermoregulatory and locomotion behaviour; humidity negatively influenced thermoregulatory behaviour and rainfall negatively influenced locomotion behaviour of Indian flying foxes. Our findings might be useful for conservation of diurnal roosting sites of fruit bats in many urban landscapes in the recent scenario of changing climate and rapid urbanization throughout the globe.