Critical Thermal Maxima in Salamanders

Hutchison, Victor H.

doi:10.1086/physzool.34.2.30152688

Cited by 355 publications

(186 citation statements)

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“…When the same tortoise was observed the following day, it was found along the fence dead. After downloading temperature data from her logger, we found carapace temperatures > 46°C before death, with a mean of 44.5°C sustained for > 1 h. While the mean body temperature of desert tortoises found above surface was found to be 34.6°C in one study (Zimmerman et al, 1994), critical thermal maximum body temperatures of desert tortoises are believed to range from 38.6-45.1°C (Hutchison et al, 1966;Naegle, 1976). To date, there is no known published literature of how long desert tortoises can endure these extreme temperatures without suffering lethal consequences.…”

Section: Discussionmentioning

confidence: 97%

Effects of roads and roadside fencing on movements, space use, and carapace temperatures of a threatened tortoise

Peaden

Nowakowski

Tuberville

et al. 2017

Biological Conservation

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A B S T R A C TRoads are widespread features of many landscapes that can negatively affect wildlife, most notably through animal-vehicle collisions. Roadside fencing has increasingly been installed to help eliminate this source of mortality. While fencing may reduce road mortality, other types of wildlife responses to this novel barrier are not well understood. Here, we examined the movement behavior, space use, and carapace temperatures of Mojave Desert Tortoises (Gopherus agassizii) as they interacted with a roadside fence and an unfenced road. Using GPS loggers, we tracked tortoise movements for two years at 15-min intervals. We found that carapace temperatures were greater near structures (fence or unfenced road) than away from structures; tortoises near the unfenced road had higher mean carapace temperatures, but tortoises along the fence experienced more extreme upper temperatures that approached the species' thermal limit. Movement speeds were also higher along the structures than away from them. Tortoise home range sizes decreased with proximity to the fence or road; fragmentation of home ranges and road-crossing avoidance may have contributed to smaller home ranges along the fenced and unfenced road, respectively. While tortoises crossed the road significantly less than expected by chance, they did so primarily in May and July and in areas with washes, indicating that placement of roadside fencing and animal underpasses could be optimized by targeting areas where roads intersect washes. Taken together, our results suggest that roadside fencing can affect behavior, space use, and thermal ecology of tortoises, which may require refinements to future conservation strategies involving roadside fencing.

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Section: Discussionmentioning

confidence: 97%

Effects of roads and roadside fencing on movements, space use, and carapace temperatures of a threatened tortoise

Peaden

Nowakowski

Tuberville

et al. 2017

Biological Conservation

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“…, a rate at which there is no lag between ambient and deep body temperature (Hutchison, 1961). The water was aerated continuously and stirred with a Fisher Scientific Precision Thermometer (accurate to the nearest 0.1 1C), which ensured complete mixing of the water.…”

mentioning

confidence: 99%

Thermal biology of newts (Notophthalmus viridescens) chronically infected with a naturally occurring pathogen

Sherman

2008

Journal of Thermal Biology

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Abstract1. Newts chronically infected with an Ichthyophonus-like organism selected warmer temperatures than healthy newts, consistent with prior work on behavioral fever, though the magnitude of the difference was much greater than reported in other studies. 2. The large difference in selected temperature (411 1C) may be a consequence of the chronic nature of the Ichthyophonus infection in newts from the field. 3. Healthy newts exhibited a higher thermal tolerance than infected newts, reflecting the greater morbidity of infected newts. 4. Little is known about the course of Ichthyophonus in newts, and the possible consequences of changes in thermal biology are discussed.

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“…Acclimation and acclimatization (Table 8.1) occur in varying degrees among animals (Ragland et al 1981) and are believed to have significant genetic components (Bennett 1990; Wilson and Echternacht 1987). The ability of animals to acclimate has been hypothesized to account for many large-scale patterns in distribution of animals (Brattstrom 1968;Hutchison 1961;JohnAlder et al 1989;Navas 1996;Wilson and Echternacht 1987).…”

Section: Acclimation and Acclimatizationmentioning

confidence: 99%

“…The time course of acclimatory responses is rarely linear and tends to occur at a logarithmic rate. Furthermore, thermal acclimation to warm temperatures has been found to occur faster in salamanders than acclimation to cool temperatures (Hutchison 1961).…”

Section: Acclimation and Acclimatizationmentioning

confidence: 99%