Elevated temperatures are associated with stress in rooftop-nesting Common Nighthawk (Chordeiles minor) chicks

Newberry, Gretchen N.; Swanson, David L.

doi:10.1093/conphys/coy010

Cited by 14 publications

(9 citation statements)

References 57 publications

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“…89 Study site and system 90 Fieldwork was conducted at the Kuruman River Reserve (33 km 2 , KRR; 26°58'S, 91 21°49'E) in the southern Kalahari. Mean summer daily maximum temperatures at the study site, 92 from 1995-2015, averaged 34.7 ± 9.7°C and mean annual precipitation averaged 186.2 ± 93 87.5mm [49].…”

Section: Methodsmentioning

confidence: 99%

High temperatures drive offspring mortality in a cooperatively breeding bird

Bourne

Cunningham

Spottiswoode

et al. 2020

Preprint

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10An improved understanding of life history responses to current environmental variability is 11 required to predict species-specific responses to anthopogenic climate change. Previous research 12 has suggested that cooperation in social groups may buffer individuals against some of the negative 13 effects of unpredictable climates. We use a 15-year dataset on a cooperative-breeding arid-zone 14 bird, the southern pied babbler Turdoides bicolor, to test i) whether environmental conditions and 15 group size correlate with survival of young during three development stages (egg, nestling, 16 fledgling), and ii) whether group size mitigates the impacts of adverse environmental conditions 17 on reproductive success. Exposure to high mean daily maximum temperatures (mean Tmax) during 18 early development was associated with reduced survival probabilities of young in all three 19 development stages. No young survived when mean Tmax > 38°C across all group sizes. Low 20 reproductive success at high temperatures has broad implications for recruitment and population 21 persistence in avian communities given the rapid pace of advancing climate change. That impacts 22temperature and rainfall patterns have led to adjustments to the timing and success of 46 reproduction in some bird species [19,20]. For birds in arid environments, higher rainfall is often 47 associated with improved reproductive success [21,22], droughts are associated with reduced 48 reproductive success [23,24] and periods of very hot weather are typically associated with lower 49 nest survival rates [15,25] and nestling growth rates [26][27][28]. Therefore, it is reasonable to expect 50 that reproductive success and population persistence of birds in arid environments will be 51 impacted as regions become hotter and drier under climate change [29,30]. 52Cooperative breeding, where more than two individuals rear a single brood [31], occurs 53 in ~9% of bird species [32]. Reproductive benefits of cooperation include earlier fledging age 54 and more broods raised per season [33]; reduced costs of breeding for females [11,34]; enhanced 55 egg investment [35]; increased fledgling recruitment [17,36]; and the ability to raise overlapping 56 broods [12,37]. Global comparative studies suggest that cooperative breeding evolved in 57 unpredictable environments [38], facilitated the colonisation of such environments [39], or 58 prevented extinction under increasingly harsh conditions [40]. One prominent explanation for the 59 occurrence of cooperative breeding in birds in variable environments is that it represents a 'bet-60 hedging' strategy [38], whereby breeding individuals share the costs of reproduction with helpers 61 and are thus able to reduce interannual variation in reproductive success in response to 62 unpredictable rainfall and food availability [9]. This implies that cooperation might buffer 63 breeding attempts from failure during adverse environmental conditions [13,41]. 64 A likely mechanism underlying such benefits of cooperation is load-lightening...

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Section: Methodsmentioning

confidence: 99%

High temperatures drive offspring mortality in a cooperatively breeding bird

Bourne

Cunningham

Spottiswoode

et al. 2020

Preprint

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“…At high temperatures over prolonged periods, incubating birds may not be able to sustain nest attendance to regulate egg temperature [81], leaving eggs vulnerable to overheating and becoming unviable [15,76]. Likewise, several studies have reported that high temperatures constrain nestling growth [24,77,82], result in smaller nestlings overall [25,83,84], alter corticosterone levels [85,86] and reduce nestling survival probabilities [87,88]. Rainfall was the strongest predictor of survival probability during the dependent fledgling stage.…”

Section: (A) Impacts Of High Temperatures During Early Developmentmentioning

confidence: 99%

High temperatures drive offspring mortality in a cooperatively breeding bird

et al. 2020

View full text Add to dashboard Cite

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 T max ) during early development was associated with reduced survival probabilities of young in all three development stages. No young survived when mean T max > 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.

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“…Adverse weather conditions impair nestling development Imlay et al 2018) by causing a trade-off between devoting energy to thermoregulation or to growth (Dawson et al 2005). High temperatures constrain nestling growth (Cunningham et al 2013;Andreasson et al 2018), result in smaller nestlings overall (Salaberria et al 2014;Wada et al 2015;Rodriguez and Barba 2016), alter corticosterone levels (Newberry and Swanson 2018;Crino et al 2020) and reduce survival probabilities (Greño et al 2008;Zuckerberg et al 2018;Bourne, Cunningham, et al 2020a). Higher rainfall often has a positive effect on nestling development (Wiley and Ridley 2016) and survival (Skagen and Yackel Adams 2012;Mares et al 2017), at least in arid and semi-arid ecosystems (Cumming and Bernard 1997;Hidalgo Aranzamendi et al 2019), although see Morganti et al (2017) and Cox et al (2019) for effects of rainy weather in temperate environments.…”

Section: Introductionmentioning

confidence: 99%

Direct and indirect effects of high temperatures on fledging success in a cooperatively breeding bird

Bourne

Ridley

Spottiswoode

et al. 2021

Preprint

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High temperatures and low rainfall consistently constrain reproduction in arid-zone bird species. Understanding the mechanisms underlying this pattern is critical for predicting how climate change will influence population persistence and to inform conservation and management. In this study, we analysed Southern Pied Babbler Turdoides nestling survival, daily growth rate and adult investment behaviour during the nestling period over three austral summer breeding seasons. High temperatures were associated with lower body mass, shorter tarsi, and reduced daily growth rates of nestlings. Piecewise structural equation modelling suggests that direct impacts of temperature had the strongest influence, followed by changes in provisioning rates by adults to older nestlings.Adjustments to adult provisioning strategies did not compensate for direct negative effects of high air temperatures on nestling body mass, tarsus and wing length, or daily growth rates. Declining reproductive success during hot weather poses a potentially serious threat to population replacement and persistence as climate change progresses, even for currently common and widespread species. Significantly lower offspring survival as a result of climate warming will likely contribute to the collapse of animal communities well before temperatures regularly approach or exceed lethal tolerance limits. Detailed mechanistic data like these allow us to model the pathways by which high temperature causes nest failure. In turn, this could allow us to design targeted conservation action to effectively mitigate climate effects.

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Elevated temperatures are associated with stress in rooftop-nesting Common Nighthawk (Chordeiles minor) chicks

Cited by 14 publications

References 57 publications

High temperatures drive offspring mortality in a cooperatively breeding bird

High temperatures drive offspring mortality in a cooperatively breeding bird

High temperatures drive offspring mortality in a cooperatively breeding bird

Direct and indirect effects of high temperatures on fledging success in a cooperatively breeding bird

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