Article
Physiology
Josh T. Arnold, Stephen J. Bailey, Simon G. Hodder, Naoto Fujii, Alex B. Lloyd
Summary: The study found that hypoxia accelerated shivering onset time by increasing skin blood flow and core-cooling rate, while nitrate ingestion delayed shivering onset time by changing central thermoeffector thresholds independent of peripheral heat exchange. The data improve understanding of how hypoxia and nitric oxide modulate cold thermoregulation.
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
(2021)
Article
Multidisciplinary Sciences
Tina Lasisi, James W. Smallcombe, W. Larry Kenney, Mark D. Shriver, Benjamin Zydney, Nina G. Jablonski, George Havenith
Summary: Humans have a unique feature of having a naked body with hair-covered scalp among mammals. The morphology of human scalp hair varies significantly among populations, but its functional role and evolutionary implications have not been studied. This study investigates the potential evolutionary function of human scalp hair and its morphology by examining heat fluxes in controlled environments with different hair types and a naked scalp. The findings suggest that hair significantly reduces solar radiation influx to the scalp, decreases the potential of evaporative heat loss, and reduces the amount of sweat required for thermal regulation, especially tightly curled hair offers increased protection against heat gain.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Ecology
Matthew Orolowitz, Eleanor Shadwell, Susan J. Cunningham
Summary: Desert birds obtain water either from their diet or by drinking surface water. The implications of drinking dependency for behavioural trade-offs in birds’ thermoregulation are not fully understood. This study found that drinking birds foraged in hotter temperatures and began panting at cooler temperatures compared to non-drinking birds. Drinking species may be less vulnerable to thermoregulatory trade-offs and more resilient to increased temperatures, but they could also be more vulnerable if water resources diminish as climate change progresses.
JOURNAL OF ARID ENVIRONMENTS
(2023)
Article
Biology
Danilo Giacometti, Alexandre V. Palaoro, Laura C. Leal, Fabio C. de Barros
Summary: This study investigated how environmental temperature seasonality affects the seasonal variation in body temperature and preferred body temperature in lizards. The results showed that body temperature varied more than preferred body temperature across seasons. Body size and thermoregulatory strategy influenced the variation in body temperature. Additionally, an increase in environmental temperature seasonality led to an increase in the seasonal variation of preferred body temperature. The study also found significant differences in body temperature and preferred body temperature among lizard families.
BIOLOGICAL REVIEWS
(2023)
Article
Biology
Jacob M. Peters, Orit Peleg, L. Mahadevan
Summary: During reproductive swarming, honeybee clusters can modulate their morphology in response to temperature changes, maintaining internal temperature and preserving energy. The shape and size changes of the clusters exhibit faster response to cooling than heating, and fluctuate even at a constant temperature.
JOURNAL OF EXPERIMENTAL BIOLOGY
(2022)
Article
Ecology
Juan G. Rubalcaba, Blanca Jimeno
Summary: Research used biophysical models to calculate the thermoregulatory costs of free-living birds in different environmental conditions, and found a significant positive association between thermoregulatory costs and baseline plasma GC concentrations. The study showed that body size and shape fundamentally modulate energy requirements for thermoregulation and thereby influence GC concentrations in the wild.
FUNCTIONAL ECOLOGY
(2022)
Article
Multidisciplinary Sciences
Mark T. Young, Charlotte I. W. Bowman, Arthur Erb, Julia A. Schwab, Lawrence M. Witmer, Yanina Herrera, Stephen L. Brusatte
Summary: Thalattosuchian crocodylomorphs were a diverse group that lived in water from the Early Jurassic to the Early Cretaceous. The subclade Metriorhynchoidea went through a remarkable evolution from semi-aquatic ambush predators to fully aquatic forms living in open oceans. Thalattosuchians share a unique palatal morphology with fossil cetaceans, having paired grooves along the palatal surface. By investigating CT scans of thalattosuchian and extant crocodylian species, this study reveals that all thalattosuchians had osseous canals connected to the oral cavity, which transmitted hypertrophied nasal vessels for heat exchange. This suggests that thalattosuchians had a complex thermoregulatory system to maintain stable temperatures for their neurosensory tissues.
Article
Biology
Timothy P. Rioux, John W. Castellani, Mitchell D. Reed, Stefanie Whalen, Monica Cisternelli, Grace Python, Marion J. Lewandowski, Xiaojiang Xu
Summary: This study validates the Six Cylinder Thermoregulatory Model (SCTM) in prolonged warm water immersion and compares the predicted values with the measured values. The results show that SCTM predicts core temperature and mean skin temperature accurately in 18 and 22 degrees C water for up to 10 h, but may overpredict in 26 degrees C water. Future studies and algorithm development are required to improve water loss prediction as well as core temperature and mean skin temperature prediction in 26 degrees C water.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Construction & Building Technology
Jinping Zhao, Faming Wang, Dengsong Ou, Binkan Zhou, Yuguo Li, Hanqing Wang, Qihong Deng
Summary: Through a simulated experiment of footbath, it was found that the skin temperature would increase while the core temperature would decrease after footbath. The higher the water temperature and the longer the footbath duration, the longer the core temperature would stay lower. The onset of sweating was inversely proportional to the water temperature. A relationship curve between sweating onset time and water temperature has been established to determine the optimal footbath conditions, which may facilitate sleep onset.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Yinping Ou, Faming Wang, Jinping Zhao, Qihong Deng
Summary: This study systematically examined the core temperature responses of elderly individuals during prolonged heatwaves and developed a modified thermoregulatory model to predict survival time. The results showed that dehydration resulting from intense heat stress could lead to fatal classic heatstroke, and increased air temperature and humidity could shorten the survival duration. The developed model can accurately predict the core temperature responses of healthy elderly individuals exposed to extreme heat and aid in the selection of efficient heatstroke prevention measures suited to the elderly.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Dahyun Jung, Hakpyeong Kim, Jongbaek An, Taehoon Hong
Summary: This study investigates age differences in thermoregulatory abilities under different temperature ramps and reveals significant differences between young and elderly subjects. Additionally, the study finds that different types of temperature ramps affect thermoregulatory abilities differently for both age groups.
BUILDING AND ENVIRONMENT
(2023)
Article
Neurosciences
Brian A. Upton, Shane P. D'Souza, Richard A. Lang
Summary: The preoptic area of the hypothalamus is a homeostatic control center with heterogeneous neurons that regulate various physiological functions. Recent studies have identified QPLOT neurons as an excitatory preoptic neuronal population that integrate thermal, metabolic, hormonal, and environmental stimuli to regulate metabolism and thermogenesis. These neurons play a significant role in suppressing thermogenesis and are characterized by specific molecular markers.
FRONTIERS IN NEUROSCIENCE
(2021)
Article
Agricultural Engineering
Mengting Zhou, Peter W. G. Groot Koerkamp, Thuy T. T. Huynh, Andre J. A. Aarnink
Summary: This study developed a mechanistic model to simulate the physiological regulation and heat dissipation processes of Holstein dairy cows under various environmental conditions. The model accurately calculated heat flow and temperature changes, and was validated through experimental data.
BIOSYSTEMS ENGINEERING
(2022)
Review
Biology
Ana Rebeca Castro Lima, Robson Mateus Freitas Silveira, Maria Samires Martins Castro, Laura Bertolaso De Vecchi, Marcia Helena Macha da Rocha Fernandes, Kleber Tomas de Resende
Summary: Knowledge on heat stress of animals is crucial for developing management strategies to mitigate its impact on livestock production. Goats are relatively resilient to climatic variations, but there is a threshold beyond which heat stress can affect their energy metabolism, physiological parameters, and behavior. Studies on the effects of ambient temperature on the energy and basal metabolisms of goats are scarce. This review aims to provide insights into the metabolic responses of goats under heat stress and contribute to the development of management strategies for mitigating heat stress in farming systems.
JOURNAL OF THERMAL BIOLOGY
(2022)
Article
Ecology
Lumir Gvozdik
Summary: This study investigated the effects of behavioral thermoregulation and competition on the life history traits of two amphibian species. The results showed that thermoregulatory opportunity accelerated differentiation rate and time to metamorphic emergence, while competition affected growth rate and mass at emergence. The combined effects of thermoregulation opportunity and competition impacted the life history traits of the larvae.
FUNCTIONAL ECOLOGY
(2022)
Article
Biodiversity Conservation
Patrick D. Moldowan, Glenn J. Tattersall, Njal Rollinson
Summary: The study found that in a northern population of fossorial salamanders in Canada, breeding body condition declined with warmer summer and autumn temperatures, and population-level reproduction was weakly influenced by autumn temperatures. Salamander breeding phenology was mainly correlated with lake ice melt, with no long-term temporal trend observed. Climate warming in the region is predicted to lead to a decline in salamander body condition, highlighting the sensitivity of fossorial salamanders to a warming climate.
GLOBAL CHANGE BIOLOGY
(2022)
Review
Ecology
Sara Ryding, Marcel Klaassen, Glenn J. Tattersall, Janet L. Gardner, Matthew R. E. Symonds
Summary: Animal appendages like avian beaks and mammalian ears can dissipate excess body heat, with animals in warmer climates typically having larger appendages for more efficient heat exchange. In response to climate change and warming, endotherms may undergo 'shape-shifting' in appendage size. Temperature is found to be a strong predictor of morphological change in endotherms, either independently or in combination with other environmental factors.
TRENDS IN ECOLOGY & EVOLUTION
(2021)
Article
Physiology
Joshua K. R. Tabh, Gary Burness, Oliver H. Wearing, Glenn J. Tattersall, Gabriela F. Mastromonaco
Summary: This study found that in birds, using infrared thermography can noninvasively capture changes in surface temperature indicating physiological stress response, with bill temperature serving as a more robust indicator compared to eye region temperature due to clearer changes and less susceptibility to bird orientation. Future studies should consider spatial orientation of study individuals when drawing inferences from infrared thermographic images.
PHYSIOLOGICAL REPORTS
(2021)
Article
Zoology
Danilo Giacometti, Katharine T. Yagi, Curtis R. Abney, Matthew P. Jung, Glenn J. Tattersall
Summary: Researchers compared field and lab data to understand the evolution of temperature-sensitive traits in ectotherms. They found that snakes with different life histories exhibit different thermoregulatory behaviors, with more active species showing a higher tendency for thermally oriented behaviors.
CANADIAN JOURNAL OF ZOOLOGY
(2021)
Article
Biology
Vlad Demartsev, Marta B. Manser, Glenn J. Tattersall
Summary: Vocal emission requires coordination with the respiratory system, and monitoring changes in respiration can help identify preparation for vocalization and examine the probability of vocal production. It can also be used to study coordination and avoidance of jamming in vocal interactions.
JOURNAL OF EXPERIMENTAL BIOLOGY
(2022)
Correction
Ecology
Sara Ryding, Marcel Klaassen, Glenn J. Tattersall, Janet L. Gardner, Matthew R. E. Symonds
Summary: Animal appendages are used to dissipate excess body heat, with larger appendages facilitating more efficient heat exchange in warmer climates. Endotherms exhibit widespread evidence of 'shape-shifting' in response to climate change. Temperature is a strong predictor of morphological change independently or in combination with other environmental changes.
TRENDS IN ECOLOGY & EVOLUTION
(2022)
Article
Physiology
Simon Tapper, Joshua K. R. Tabh, Glenn J. Tattersall, Gary Burness
Summary: Fever and hypothermia are well-characterized components of systemic inflammation, but the mechanisms underlying such temperature changes in birds are not well understood. This study found that injection of LPS in zebra finches resulted in a slight increase in body temperature and reduced peripheral heat loss, particularly in the legs.
PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY
(2022)
Letter
Ecology
Sara Ryding, Marcel Klaassen, Glenn J. Tattersall, Janet L. Gardner, Matthew R. E. Symonds
TRENDS IN ECOLOGY & EVOLUTION
(2022)
Article
Multidisciplinary Sciences
Alexandra McQueen, Marcel Klaassen, Glenn J. Tattersall, Robyn Atkinson, Roz Jessop, Chris J. Hassell, Maureen Christie, Matthew R. E. Symonds
Summary: The size and shape of shorebirds show patterns along latitudes, which can be best explained by their adaptation to warm climates. This pattern is consistent across diverse species and environments, with birds in tropical regions having longer bills and smaller bodies.
NATURE COMMUNICATIONS
(2022)
Article
Behavioral Sciences
Gary J. Pickering, Nicholas Anger, Julia Baird, Gillian Dale, Glenn J. Tattersall
Summary: The primary purpose of this study was to investigate whether 2D:4D ratios could be determined using participant-submitted hand images, and to examine the relationship between 2D:4D ratio and pro-environmental behaviors, attitudes, and empathy. Participants were asked to submit hand images and complete questionnaires assessing demographics, empathy, and environmental attitudes and behavior. The study found that the 2D:4D ratios fell somewhat outside of previously reported ranges, but showed acceptable consistency. There was a sex by ratio interaction for both empathy and engagement in pro-environmental behaviors, with males reporting lower empathy and less engagement, and females reporting more engagement in pro-environmental behaviors. These findings were contrary to expectations. Overall, this study provides a preliminary examination of the utility of measuring digit ratio with online samples, and sheds light on the complex relationship between sex and pro-environmental behaviors.
Article
Biology
Glenn J. Tattersall, Kevin L. Campbell
Summary: The star-nosed mole has specialized star-like rostrum for tactile sensation, but it does not actively regulate its surface temperature when exposed to cold water and thermally conductive soil, which may help reduce conductive heat loss.
JOURNAL OF EXPERIMENTAL BIOLOGY
(2023)
Article
Biology
Erich R. Eberts, Glenn J. Tattersall, Peter J. Auger, Maria Curley, Melissa I. Morado, Eric G. Strauss, Donald R. Powers, Noemi C. Soveral, Bret W. Tobalske, Anusha Shankar
Summary: This study uses thermal imaging to investigate how nesting female hummingbirds maintain energy balance while incubating their eggs and brooding their chicks. The research found that nesting females usually avoid torpor and instead reduce their own energy requirements by utilizing the warm nest environment and possibly shallow torpor, prioritizing the needs of their offspring.
JOURNAL OF THERMAL BIOLOGY
(2023)
Article
Biology
Jussara N. Chaves, Glenn J. Tattersall, Denis Andrade
Summary: Body temperature regulation in the toco toucan involves adjustments in heat production and exchange rates between the bird and its environment. The bill of the toco toucan has been hypothesized to play a role in thermal homeostasis. This study directly evaluated the contribution of heat exchange through the bill and found that while it doesn't significantly widen the thermal neutral zone, it may be important in regulating body temperature at higher temperatures.
JOURNAL OF EXPERIMENTAL BIOLOGY
(2023)
Article
Biology
Alexandra McQueen, Ryan Barnaby, Matthew R. E. Symonds, Glenn J. Tattersall
Summary: This study used infrared thermography to investigate the physiological control of heat loss via bird bills and legs. The results showed that birds are less able to regulate heat loss via their bills compared to their legs. In cold conditions, birds lower their leg surface temperature to retain heat, while in warm conditions, they increase their leg surface temperature to expel heat. By contrast, bill surface temperature remains consistently higher than the plumage surface temperature, indicating consistent heat loss. This poor physiological control of heat loss via bird bills likely leads to stronger selection for shorter bills in cold climates and has implications for predicting shape-shifting responses to climate change.
Article
Zoology
Nicholas B. Sakich, Glenn J. Tattersall
Summary: Many lepidosaur reptiles can behaviorally regulate their exposure to UV light. In the case of Bearded Dragons, scaleless individuals have a preference for lower levels of UV light exposure. Regardless of their scale phenotype, Bearded Dragons receive higher UV irradiation when in the cold section of a UV gradient apparatus compared to the hot section.
ICHTHYOLOGY AND HERPETOLOGY
(2022)