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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Ground cavity nest temperatures and their relevance to Blue Swallow Hirundo atrocaerulea conservation
Auteurs :	James Wakelin, Auteur ; Amy-Leigh Wilson, Auteur ; Colleen T. Downs, Auteur
Type de document :	Article
Dans :	Ostrich (84(3) 2013)
Article en page(s) :	221-226
Langues:	Anglais
Résumé :	Blue Swallows Hirundo atrocaerulea are Critically Endangered within South Africa. They nest in natural underground holes in mist-belt grasslands. Temperature dataloggers were used to record ground cavity nest (T-n) and ambient temperature (T-a) for one artificial and 11 natural Blue Swallow nests. Mean ground cavity Tn was significantly different to mean T-a. T-n ranged from 17.0 +/- 0.1 degrees C to 28.5 +/- 0.3 degrees C and varied less than T-a (14.0 +/- 0.2 to 47.7 +/- 0.4 degrees C). Mean ground cavity T-n averaged 3.3 +/- 0.9 degrees C warmer than mean T-a for 58% of nests, and mean T-a averaged 2.6 +/- 0.5 degrees C warmer than mean ground cavity T-n for 42% of nests. There was no significant difference in mean ground cavity Tn for the aardvark-excavated holes (22.7 +/- 1.6 degrees C) and sinkholes (21.5 +/- 1.2 degrees C). Blue Swallows also nest in man-made holes, potentially a way to increase nesting sites. Mean aardvark-excavated Tn (19.2 +/- 0.1 degrees C) was significantly warmer than mean artificial cavity T-n (18.5 +/- 0.2 degrees C). Further investigation of breeding success of Blue Swallows in relation to T-n, incubation strategies and predation risk needs to be addressed in future studies for a better understanding of their reproductive ecology.

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