Mediterranean songbirds show pronounced seasonal variation in thermoregulatory traits

González‐Medina, Erick; Playà‐Montmany, Núria; Cabello-Vergel, Julián; Parejo, Manuel; Abad‐Gómez, José M.; Sánchez‐Guzmán, Juan M.; Villegas, Auxiliadora; Gutiérrez, Jorge S.; Masero, José A.

doi:10.1016/j.cbpa.2023.111408

Cited by 3 publications

(5 citation statements)

References 77 publications

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“…We also found that EWL responded more slowly than MR at high T a-chamb , and phenotypic flexibility in EWL was not evident at T a-chamb < T a . This is consistent with the literature, where the direction of change in EWL with acclimation temperature is less consistent across studies than for MR, and effects can differ below and above the T uc 23 , 38 , 40 . This might be because of the underlying mechanisms allowing MR versus EWL flexibility (e.g.…”

Section: Discussionsupporting

confidence: 90%

“…on the day of the experiment (T 0day ), the day before (T −1day ), or over the preceding 3 days (T −3days ), 1 week (T −1week ) and 2 weeks (T −2weeks )), and then tested which time interval best explained the observed variation in thermoregulatory values. Similarly to changes observed in summer-acclimatised or heat-acclimated individuals across avian species 15 , 23 , 38 – 40 , we predicted that exposure to heatwave conditions before measurement would be associated with lower MR and higher evaporative cooling capacity (EHL/MHP), whereas EWL may be lower (to conserve water). We also expected these changes to be associated with lower T b and greater acute heat tolerance after hot weather.…”

Section: Introductionmentioning

confidence: 93%

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Thermal acclimatisation to heatwave conditions is rapid but sex-specific in wild zebra finches

Pessato,

Udino,

McKechnie

et al. 2023

Sci Rep

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Under climate change, increasing air temperature average and variability pose substantial thermal challenges to animals. While plasticity in thermoregulatory traits could potentially attenuate this impact, whether thermal acclimatisation can occur quickly enough to track weather variability in hot climates is unknown in any endotherm, and sex differences have never been tested. We investigated acclimatisation responsiveness of male and female wild zebra finches to short-term (< 2 weeks) summer temperature fluctuations in the Australian desert. Hotter weather before respirometry trials triggered a typical acclimatisation response (especially at chamber temperature Tchamb ≥ 40). However, acclimatisation occurred remarkably rapidly: metabolic rate responded within just one day, while body temperature (Tb) and evaporative cooling capacity (EHL/MHP) were best predicted by weather on the trial day; whereas evaporative water loss responded more slowly (1 week). Nonetheless, rapid acclimatisation only occurred in males, and females had higher Tb and lower EHL/MHP than males, potentially increasing hyperthermia risk. Furthermore, acclimatisation did not translate into greater acute heat tolerance (i.e. ability to tolerate Tchamb = 46 °C). Our results therefore reveal surprisingly rapid acclimatisation and even anticipatory adjustments to heat. However, with no changes in acute heat tolerance, and in females, phenotypic flexibility may provide only limited buffering against the detrimental impact of heatwaves.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 93%

Thermal acclimatisation to heatwave conditions is rapid but sex-specific in wild zebra finches

Pessato,

Udino,

McKechnie

et al. 2023

Sci Rep

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“…Because we generated a maximum clade credibility tree from the posterior distribution of 5000 trees (downloaded by birdtree.org), the potential effect of phylogenetic uncertainty may have been minimized in our results (see also Martin & Bonier 2018, Sayol et al 2020, Gonz alez-Medina et al 2023, Mikula et al 2023; overall, we have interpreted our findings as evidence for the positive associations between our proposed classification of nest attachment complexity and relative brain sizes of passerine birds.…”

Section: Discussionmentioning

confidence: 97%

“…2020, González‐Medina et al . 2023, Mikula et al . 2023); overall, we have interpreted our findings as evidence for the positive associations between our proposed classification of nest attachment complexity and relative brain sizes of passerine birds.…”

Section: Discussionmentioning

confidence: 99%

“…For the modelling, we used a sample of 5000 trees obtained from birdtree.org (Jetz et al 2012) to generate a consensus phylogeny (maximum clade credibility tree) with the Phangorn R package (Schliep 2011). Then, we performed the modelling by including the consensus phylogeny as a random factor (see also Martin & Bonier 2018, Sayol et al 2020, Gonz alez-Medina et al 2023, Mikula et al 2023. The maximum clade credibility tree summarization method uses the posterior sample of trees and reduces this to a single tree, i.e.…”

Section: Statistical Analysesmentioning

confidence: 99%

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Nest attachment, rather than nest type, correlates with passerine bird brain size

Leite,

Camacho,

Francisco

2023

Ibis

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Variation in relative interspecific brain size has been correlated with cognitive capacities in different animal groups. Bird nest construction is one of the most remarkable animal abilities, and has reached the highest diversification in the Passeriformes. Yet, its relationship with brain size is not fully understood. Here, we used a dataset of 455 species to address potential correlations between nest types (open and enclosed) and five categories of nest attachment mode, as well as a set of covariables, with relative brain mass (Rbmass) of passerine birds. Bayesian regression modelling with phylogenetic control revealed that nest attachment mode, rather than nest type, was associated with Rbmass variation, despite the strong effects of habitat, migration and phylogeny. A phylogenetic confirmatory path analysis suggested that Rbmass and nest attachment can interact via a direct evolutionary link and also through an indirect link mediated through habitat (vegetation density). Phylogenetic ridge regression indicated that Top suspended nests were associated with species close to a maximum relative brain size, and that Rim suspended nests were associated with brain size radiations and probably with the exploration of new ecological niches. Our study provides evidence that the construction of nests with different attachment modes requires different levels of cognitive abilities, and we provide insights into the relationships between passerine brain size and nest attachment diversification.

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Seasonal and between-population variation in heat tolerance and cooling efficiency in a Mediterranean songbird

Cabello-Vergel,

Gutiérrez,

González-Medina

et al. 2024

Journal of Thermal Biology

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Mediterranean songbirds show pronounced seasonal variation in thermoregulatory traits

Cited by 3 publications

References 77 publications

Thermal acclimatisation to heatwave conditions is rapid but sex-specific in wild zebra finches

Thermal acclimatisation to heatwave conditions is rapid but sex-specific in wild zebra finches

Nest attachment, rather than nest type, correlates with passerine bird brain size

Seasonal and between-population variation in heat tolerance and cooling efficiency in a Mediterranean songbird

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