Interspecific variation in avian thermoregulatory patterns and heat dissipation behaviours in a subtropical desert

Physiology & Behavior
Michelle L ThompsonAndrew E McKechnie

Abstract

Deserts are physiologically challenging environments for birds, with scarce, unpredictable water resources combined with air temperatures (Tair) regularly exceeding avian body temperature (Tb). For arid-zone birds, mismatches between water supply and demand are a constant threat, yet interspecific variation in trade-offs between hyperthermia avoidance and dehydration avoidance remain poorly understood, particularly for free-ranging individuals. We examined behavioural and physiological responses to high Tair in nine species representing three orders that vary substantially in their heat dissipation thresholds, specifically pant50, the Tair at which panting behaviour is present in 50% of observations. Birds housed during mid-summer in large free-flight aviaries in the Kalahari Desert each received a surgically-implanted Tb logger, and we quantified shade-seeking, activity and panting behaviours to examine relationships between species-specific pant50 and Tb regulation. Overall, species setpoint Tb values were higher (range: 41.4 ± 0.5 °C to 43.1 ± 0.4 °C) than expected with maximum Tb values of 43.4-45.5 °C. Interspecific variation in Tb patterns at high Tair was substantial, with Tb increasing with Tair in most species, whereas...Continue Reading

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Citations

Aug 8, 2019·Physiology·Andrew E McKechnie, Blair O Wolf
Nov 30, 2018·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Ryno Kemp, Andrew E McKechnie
Jun 12, 2020·Conservation Physiology·Shannon R ConradieAndrew E McKechnie
Feb 26, 2019·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Monique van DykAndrew E McKechnie
Jun 27, 2019·Proceedings of the National Academy of Sciences of the United States of America·Shannon R ConradieAndrew E McKechnie
Oct 10, 2021·Scientific Reports·Julián Cabello-VergelJorge S Gutiérrez

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