Natural resource management advisory series : note 7: Bat roosts

Abstract

This advisory note examines the ecological requirements and conservation needs of microbats (Microchiropteran bats) in North East New South Wales, with particular focus on their roosting habitats. The document highlights that microbats comprise approximately 39% of mammal species in the region, with 19 species listed as threatened under the NSW Threatened Species Conservation Act 1995. The note details the characteristics of significant roost sites, particularly subterranean structures including mines and caves, emphasizing features such as horizontal tunnels, elevated humidity, and stable temperatures. It provides a comprehensive overview of bat species known to inhabit derelict mines and caves in NSW, including the vulnerable Large Bent-wing Bat (Miniopterus schreibersii) and Little Bent-wing Bat (Miniopterus australis). The advisory note identifies key threats to cave-dwelling bat populations, notably roost site disturbance and habitat modification, and outlines critical conservation measures including the protection of trees with hollows, caves, and subterranean tunnels. This document serves as a technical resource for environmental managers and stakeholders involved in microbat conservation in New South Wales.