Thermoregulatory strategies of songbird nestlings reveal limited capacity for cooling and high risk of dehydration DOI Creative Commons
Jenna Diehl, Lesley A. Alton, Craig R. White

et al.

Journal of Thermal Biology, Journal Year: 2023, Volume and Issue: 117, P. 103707 - 103707

Published: Sept. 22, 2023

How the accelerating pace of global warming will affect animal populations depends on effects increasing temperature across life cycle. Developing young are sensitive to environmental challenges, often with life-long consequences, but risks climate during this period insufficiently understood. This may be due limited insight into physiological sensitivity and temperatures that represent a thermal challenge for young. Here we examined behavioural by measuring metabolic rate, water loss, heat dissipation behaviours between 25-45 °C in nestlings small free-living songbird temperate SE-Australia, superb fairy-wren. We found high relatively narrow thermoneutral zone from 33.1 42.3 °C, rate all panting above range. Evaporative loss sharply increased 33.5 °C; at same temperature, changed their posture (extended wings) facilitate passive loss. However, measured, was insufficient dissipate metabolically produced heat, indicating poor cooling capabilities, which persisted even when individuals were panting. While tolerant higher temperatures, no evidence hyperthermia below 42 they risk dehydration lower ability mitigate this. Thus, is likely elevate dehydration, concerning, since it accompanied drier conditions.

Language: Английский

Short-term heat waves have long-term consequences for parents and offspring in stickleback DOI Creative Commons

Rachel Barrett,

Laura R. Stein

Behavioral Ecology, Journal Year: 2024, Volume and Issue: 35(4)

Published: April 27, 2024

Abstract Extreme temperature events, such as heat waves, can have lasting effects on the behavior, physiology, and reproductive success of organisms. Here, we examine impact short-term exposure to a simulated wave condition, parental care, in population threespine stickleback (Gasterosteus aculeatus), small fish with exclusive paternal currently experiencing regular waves. Males were either exposed (23 °C) for 5 d or held at an ideal (18 °C). Following this 5-d treatment, all males transferred 18 °C, where they completed full parenting cycle. Offspring raised °C. We found that while mass body condition unaffected wave, cortisol responses dampened across nesting cycle compared control males. In addition, had longer latency eggs hatch, lower hatching success, showed levels care behavior affecting swimming performance. Altogether, our results highlight long-term even events subsequent generations, providing insight into rapid environmental change.

Language: Английский

Citations

5
Cooperative breeding does not mitigate declines in offspring care with cool and wet conditions in a temperate Australian songbird DOI Creative Commons
Jenna Diehl,

A Robinson,

Gregory T. Taylor

et al.

Royal Society Open Science, Journal Year: 2025, Volume and Issue: 12(3)

Published: March 1, 2025

Adverse climatic conditions can decrease reproductive success by reducing parents’ ability to provide enough resources growing young. Here, we address the hypothesis that helpers at nest buffer negative effects of challenging (cool and wet) in cooperatively breeding superb fairy-wrens. We first established public records are adequate quantify climate effects: temperatures recorded a nearby meteorological station explained total offspring care equally well as microclimate measured inside near site. then compared temperature rainfall on pairs with without found (i) lower, more energetically temperatures, nestlings receive larger prey biomass, females brood young more, but these increases occur regardless helper presence; (ii) groups biomass during dry conditions, higher previous week reduces this level unassisted pairs. Overall, cooperative fairy-wrens does not appear conditions: do mitigate cool although deliver food, benefit disappears periods high rainfall.

Language: Английский

Citations

0
No effect of testosterone or sexual ornamentation on telomere dynamics: A case study and meta‐analyses DOI Creative Commons
Gregory T. Taylor, Alexandra McQueen, Justin R. Eastwood

et al.

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(3)

Published: March 1, 2024

Abstract Life‐history theory predicts that reproductive investments are traded‐off against self‐maintenance. Telomeres, the protective caps on ends of chromosomes, offer a promising avenue for assessing life‐history trade‐offs, as they shorten in response to stressors and predictive remaining lifespan. In males, testosterone frequently mediates part, through its effects sexual ornamentation, which is an important aspect investment. However, studies within‐individual associations between telomere dynamics ornamentation limited number have produced mixed results. Furthermore, most such been observational, making it difficult discern nature any causal relationship. To address this, we used short‐acting implants free‐living male superb fairy‐wrens ( Malurus cyaneus ) stimulate production ornament: early moult into costly blue breeding plumage. We found no evidence elevated testosterone, consequent earlier plumage, accelerated shortening. therefore followed up with systematic review two meta‐analyses (28 studies, 54 effect sizes) exploring telomeres (1) (2) ornamentation. line our experimental findings, neither meta‐analysis showed overall correlation or length dynamics. meta‐regression experimental, compared reported greater trade‐offs. Our highlight need further better understand potential responses

Language: Английский

Citations

2
Cool, dry nights and short heatwaves during growth result in longer telomeres in temperate songbird nestlings DOI Creative Commons
Justin R. Eastwood, Andréaz Dupoué, Simon Verhulst

et al.

Molecular Ecology, Journal Year: 2023, Volume and Issue: 32(19), P. 5382 - 5393

Published: Aug. 22, 2023

Abstract Exposure to rising sublethal temperatures can affect development and somatic condition, thereby Darwinian fitness. In the context of climate warming, these changes could have implications for population viability, but they be subtle consequently difficult quantify. Using telomere length (TL) as a known biomarker condition in early life, we investigated impact pre‐hatching nestling on six cohorts wild superb fairy wrens ( Malurus cyaneus ) temperate south‐eastern Australia. Models incorporating only information from phase were best supported compared those including (pre‐)laying incubation (previously shown mass) or both phases combined. This implies that TL is most sensitive ambient phase. The top model showed negative relationship between early‐life mean daily minimum temperature when rainfall was low which gradually became positive with increasing rainfall. addition, there frequency hot days (daily maximum ≥35°C), although rare short‐term. Including other period, variables (e.g., diurnal variability) did not improve prediction TL. Overall, our results suggest cooler nights conditions are dry short‐term spikes above 35°C during conducive maintenance. While findings indicate potential pathway warming wildlife fitness, emphasize need elucidate mechanisms underlying complex associations.

Language: Английский

Citations

5
Thermoregulatory strategies of songbird nestlings reveal limited capacity for cooling and high risk of dehydration DOI Creative Commons
Jenna Diehl, Lesley A. Alton, Craig R. White

et al.

Journal of Thermal Biology, Journal Year: 2023, Volume and Issue: 117, P. 103707 - 103707

Published: Sept. 22, 2023

How the accelerating pace of global warming will affect animal populations depends on effects increasing temperature across life cycle. Developing young are sensitive to environmental challenges, often with life-long consequences, but risks climate during this period insufficiently understood. This may be due limited insight into physiological sensitivity and temperatures that represent a thermal challenge for young. Here we examined behavioural by measuring metabolic rate, water loss, heat dissipation behaviours between 25-45 °C in nestlings small free-living songbird temperate SE-Australia, superb fairy-wren. We found high relatively narrow thermoneutral zone from 33.1 42.3 °C, rate all panting above range. Evaporative loss sharply increased 33.5 °C; at same temperature, changed their posture (extended wings) facilitate passive loss. However, measured, was insufficient dissipate metabolically produced heat, indicating poor cooling capabilities, which persisted even when individuals were panting. While tolerant higher temperatures, no evidence hyperthermia below 42 they risk dehydration lower ability mitigate this. Thus, is likely elevate dehydration, concerning, since it accompanied drier conditions.

Language: Английский

Citations

3