Daniel T. Roberts, Martín Iglesias, Jules E. Farquhar , David G. Chapple
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引用次数: 0
Abstract
High-elevation ectotherms are vulnerable to climate change due to their restricted ranges, limited dispersal capacity, and reliance on external temperatures for physiological regulation. In Australia, montane regions are limited in extent and elevation, making their cold-adapted fauna especially sensitive to warming. Egernia roomi (Kaputar rock skink) is a Critically Endangered, crevice-dwelling lizard endemic to the high-elevation areas of Mount Kaputar, New South Wales, Australia. Despite its elevated conservation status, little is known about its thermal ecology or climate sensitivity. We projected potential impacts of climate change on thermal activity by quantifying the thermal buffering capacity of rock crevices, and modelling changes in activity time under future climate scenarios. Field-deployed operative temperature models were used to compare crevice and exposed microhabitats across the species' activity season. These data were combined with biophysical modelling (NicheMapR) to simulate body temperature, activity time, and water loss under present and projected climatic conditions. Crevices consistently provided strong thermal buffering, remaining up to 28 °C cooler than exposed surfaces during the day. NicheMapR model predictions aligned with observed temperatures, and predicted substantial increases in daily thermal activity time under moderate to high emissions scenarios (up to +1.6 h/day by 2090 under RCP8.5). These findings offer insight into the species’ thermoregulatory potential and highlight the importance of fine-scale microhabitat features in shaping climate vulnerability.
期刊介绍:
The Journal of Thermal Biology publishes articles that advance our knowledge on the ways and mechanisms through which temperature affects man and animals. This includes studies of their responses to these effects and on the ecological consequences. Directly relevant to this theme are:
• The mechanisms of thermal limitation, heat and cold injury, and the resistance of organisms to extremes of temperature
• The mechanisms involved in acclimation, acclimatization and evolutionary adaptation to temperature
• Mechanisms underlying the patterns of hibernation, torpor, dormancy, aestivation and diapause
• Effects of temperature on reproduction and development, growth, ageing and life-span
• Studies on modelling heat transfer between organisms and their environment
• The contributions of temperature to effects of climate change on animal species and man
• Studies of conservation biology and physiology related to temperature
• Behavioural and physiological regulation of body temperature including its pathophysiology and fever
• Medical applications of hypo- and hyperthermia
Article types:
• Original articles
• Review articles