High temperatures drive offspring mortality in a cooperatively breeding bird

Amanda Bourne, Susan Cunningham, Claire Spottiswoode, Mandy Ridley

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

An improved understanding of life-history responses to current environmental variability is required to predict species-specific responses to anthopogenic climate change. Previous research has suggested that cooperation in social groups may buffer individuals against some of the negative effects of unpredictable climates. We use a 15-year dataset on a cooperative breeding arid zone bird, the southern pied babbler Turdoides bicolor, to test (i) whether environmental conditions and group size correlate with survival of young during three development stages (egg, nestling, fledgling) and (ii) whether group size mitigates the impacts of adverse environmental conditions on survival of young. Exposure to high mean daily maximum temperatures (mean Tmax) during early development was associated with reduced survival probabilities of young in all three development stages. No young survived when mean Tmax > 38°C, across all group sizes. Low survival of young at high temperatures has broad implications for recruitment and population persistence in avian communities given the rapid pace of advancing climate change. Impacts of high temperatures on survival of young were not moderated by group size, suggesting that the availability of more helpers in a group is unlikely to buffer against compromised offspring survival as average and maximum temperatures increase with rapid anthropogenic climate change.
Original languageEnglish
Article number20201140
Number of pages9
JournalProceedings of the Royal Society of London: series B
Volume287
Issue number1931
DOIs
Publication statusPublished - 29 Jul 2020

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