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Pacific Conservation Biology Pacific Conservation Biology Society
A journal dedicated to conservation and wildlife management in the Pacific region.
RESEARCH ARTICLE

Designing better nestboxes: double-walled and pale proves coolest under the sun

Murray V. Ellis A and Susan Rhind https://orcid.org/0000-0002-2589-9521 B *
+ Author Affiliations
- Author Affiliations

A Science Division, NSW Office of Environment and Heritage, PO Box 1967, Hurstville BC, NSW 1481, Australia.

B University of Wollongong, Northfields Avenue, Wollongong, NSW 2500, Australia.

* Correspondence to: susan.rhind@gmail.com

Handling Editor: Mike Calver

Pacific Conservation Biology 28(5) 444-454 https://doi.org/10.1071/PC21043
Submitted: 8 July 2021  Accepted: 3 August 2021   Published: 12 October 2021

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: Fauna nestboxes are used for conservation, research and mitigation against tree hollow/cavity loss. Scant attention has been given to the microclimate inside boxes until recently, with concern that nestboxes may be ineffective or a thermal trap because of high internal temperatures during summer.

Aim: Our study used construction design principles to guide modifications to nestboxes to reduce maximum temperatures inside boxes.

Methods: Five trials were undertaken, and modifications included addition of thermal mass, creation of a double wall system and painting the box and/or outer wall white. Nestboxes were placed in full sun.

Key results: The internal temperature difference from ambient between the worst (unpainted box) and the best box design was around 7°C at 30°C, and 9.5°C at 40°C. Painting boxes white had a marked impact on internal temperatures, but the single modification giving most protection from heat gain was construction of a ventilated double wall. This created a shaded air space around the internal box. Painting the outer layer white further improved insulation, and painting both the box and outer layer gave the best result.

Conclusion: Double-walled, pale nestboxes can provide significant protection from solar heat. Implications  Adding an air space to insulate a nestbox has considerable advantages over alternatives − it contributes little weight (compare using denser wood/materials); avoids environmental issues associated with insulators such as polystyrene or foil batts; is inexpensive; is easy to retrofit a second layer around existing boxes and it should improve nestbox longevity as the outer layer protects the inner box from weathering.

Keywords: air space insulation, artificial hollows, artificial tree cavities, colour, microclimate, thermal mass, thermal tolerance, twin-wall


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