Nest temperature fluctuations in a cavity nester, the southern ground-hornbill

Show simple item record Combrink, L. Combrink, H.J. (Hendrik) Botha, A.J. Downs, Colleen T. 2017-05-12T10:57:56Z 2017-05
dc.description.abstract Southern ground-hornbills Bucorvus leadbeateri inhabit savanna and bushveld regions of South Africa. They nest in the austral summer, which coincides with the wet season and hottest daytime temperatures in the region. They are secondary cavity nesters and typically nest in large cavities in trees, cliffs and earth banks, but readily use artificial nest boxes. Southern ground-hornbills are listed as Endangered in South Africa, with reintroductions into suitable areas highlighted as a viable conservation intervention for the species. Nest microclimate, and the possible implications this may have for the breeding biology of southern ground-hornbills, have never been investigated. We used temperature dataloggers to record nest cavity temperature and ambient temperature for one artificial and 11 natural southern ground-hornbill tree cavity nests combined, spanning two breeding seasons. Mean hourly nest temperature, as well as mean minimum and mean maximum nest temperature, differed significantly between southern ground-hornbill nests in both breeding seasons. Mean nest temperature also differed significantly from mean ambient temperature for both seasons. Natural nest cavities provided a buffer against the ambient temperature fluctuations. The artificial nest provided little insulation against temperature extremes, being warmer and cooler than the maximum and minimum local ambient temperatures, respectively. Nest cavity temperature was not found to have an influence on the breeding success of the southern ground-hornbill groups investigated in this study. These results have potentially important implications for southern ground-hornbill conservation and artificial nest design, as they suggest that the birds can tolerate greater nest cavity temperature extremes than previously thought. en_ZA
dc.description.department Veterinary Tropical Diseases en_ZA
dc.description.embargo 2018-05-31
dc.description.librarian hb2017 en_ZA
dc.description.sponsorship The Ford Wildlife Foundation and the First Rand Foundation (Project reference : 033391). en_ZA
dc.description.uri en_ZA
dc.identifier.citation Combrink, L, Combrink, HJ, Botha, AJ & Downs, CT 2017, 'Nest temperature fluctuations in a cavity nester, the southern ground-hornbill', Journal of Thermal Biology, vol. 66, pp. 21-26. en_ZA
dc.identifier.issn 0306-4565 (print)
dc.identifier.issn 1879-0992 (online)
dc.identifier.other 10.1016/j.jtherbio.2017.03.003
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2017 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Journal of Thermal Biology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Journal of Thermal Biology, vol. 66, pp. 21-26, 2017. doi : 10.1016/j.jtherbio.2017.03.003. en_ZA
dc.subject Cavity nester en_ZA
dc.subject Temperature fluctuation en_ZA
dc.subject Nest temperature en_ZA
dc.subject Hornbill en_ZA
dc.subject Conservation en_ZA
dc.subject Ground-hornbill (Bucorvus leadbeateri) en_ZA
dc.title Nest temperature fluctuations in a cavity nester, the southern ground-hornbill en_ZA
dc.type Postprint Article en_ZA

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