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Australian Journal of Zoology Australian Journal of Zoology Society
Evolutionary, molecular and comparative zoology
RESEARCH ARTICLE

Roosting behaviour and the tree-hollow requirements of bats: insights from the lesser long-eared bat (Nyctophilus geoffroyi) and Gould’s wattled bat (Chalinolobus gouldii) in south-eastern Australia

Linda F. Lumsden https://orcid.org/0000-0002-4967-4626 A B E , Stephen R. Griffiths https://orcid.org/0000-0003-3882-3654 C D , John E. Silins A and Andrew F. Bennett B C D
+ Author Affiliations
- Author Affiliations

A Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, Heidelberg, Vic. 3084, Australia.

B School of Ecology and Environment, Deakin University, Burwood, Vic. 3125, Australia.

C Department of Ecology, Environment and Evolution, La Trobe University, Bundoora, Vic. 3086, Australia.

D Research Centre for Future Landscapes, La Trobe University, Bundoora, Vic. 3086, Australia.

E Corresponding author. Email: Lindy.Lumsden@delwp.vic.gov.au

Australian Journal of Zoology - https://doi.org/10.1071/ZO20072
Submitted: 1 August 2020  Accepted: 23 April 2021   Published online: 26 May 2021

Abstract

Access to suitable roosts is critical for the conservation of tree-hollow roosting bats worldwide. Availability of roost sites is influenced by human land-use, but also by the roosting requirements and behaviour of species. We investigated roosting behaviour of the lesser long-eared bat (Nyctophilus geoffroyi) and Gould’s wattled bat (Chalinolobus gouldii) in a rural landscape in south-eastern Australia. Forty-five N. geoffroyi and 27 C. gouldii were fitted with radio-transmitters, resulting in the location of 139 and 89 roosts, respectively. Most (88%) roosts occupied by male N. geoffroyi contained only a single individual. During the breeding season female colonies were larger, with maternity roosts containing 18.3 ± 5.7 (s.e.) individuals. Mean colony sizes for C. gouldii were 8.7 ± 1.4 individuals. Both species shifted roosts frequently: on average, individual N. geoffroyi moved every 2.2 ± 0.23 days and C. gouldii every 2.2 ± 0.14 days. Notably, lactating female N. geoffroyi shifted roosts more frequently than non-breeding females. Individuals of both species roosted within a discrete area, with roosts typically <300 m apart; and consistently returned there from foraging up to 12 km distant. This roosting behaviour highlights three important requirements: (1) a relatively large overall number of hollows to support a population; (2) discrete roost areas with a high density of suitable hollows in close proximity; and (3) a range of hollow types to provide the specialised roosts required, particularly for breeding.

Keywords: bats, behavioural ecology, conservation, habitat fragmentation, radio telemetry, roost selection, rural landscapes, tree cavities.


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