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4 results for “Field body temperature”
Field-based body temperatures reveal behavioral thermoregulation strategies of the Atlantic marsh fiddler crab Minuca pugnax
<p>Behavioral thermoregulation is an important defense against the negative impacts of climate change for ectotherms. In this study we examined the use of burrows by a common intertidal crab, Minuca pugnax, to control body temperature. To understand how body temperatures respond to changes in the surface temperature and explore how efficiently crabs exploit the cooling potential of burrows to thermoregulate, we measured body, surface, and burrow temperature data during low tide on Sapelo Island, GA in March, May, August, and September of 2019 . We found that an increase in 1 °C in the surface temperature led to a 0.70-0.71 °C increase in body temperature for females and an increase in 0.75-0.77 °C in body temperature for males. Body temperatures of small females were 0.3 °C warmer than large females for the same surface temperature. Female crabs used burrows more efficiently for thermoregulation compared to the males. Specifically, an increase of 1°C in the cooling capacity (the difference between the burrow temperature and the surface temperature) led to an increase of 0.42-0.50°C for females and 0.34-0.35°C for males in the thermoregulation capacity (the difference between body temperature and surface temperature). The body temperature that crabs began to use burrows to thermoregulate was estimated to be around 24°C, which is far below the critical body temperatures that could lead to death. Many crabs experience body temperatures of 24°C early in the reproductive season, several months before the hottest days of the year. Because the use of burrows involves fitness trade-offs, these results suggest that warming temperatures could begin to impact crabs far earlier in the year than expected.</p>
A global analysis of field body temperatures of active squamates in relation to climate and behaviour
<p><strong>Aim</strong>: Squamate fitness is affected by body temperature, which in turn is influenced by environmental temperatures and, in many species, by exposure to solar radiation. The biophysical drivers of body temperature have been widely studied, but we lack an integrative synthesis of actual body temperatures experienced in the field, and their relationships to environmental temperatures, across phylogeny, behaviour, and climate.</p> <p><strong>Location</strong>: Global (25 countries on six continents)</p> <p><strong>Taxa</strong>: Squamates (210 species, representing 25 families)</p> <p><strong>Methods</strong>: We measured body temperatures during activity for 20,231 individuals, and examined how body temperatures vary with substrate and air temperatures across taxa, climates, and behaviours (basking and diel activity).</p> <p><strong>Results</strong>: Heliothermic lizards had the highest body temperatures and those most weakly correlated with substrate and air temperatures. Body temperatures of non-heliothermic diurnal lizards were similar to heliotherms in relation to air temperature but to nocturnal species in relation to substrate temperatures. Diurnal snake and non-heliothermic lizard body temperatures were more strongly correlated to air and substrate temperatures than in heliotherms. Correlation parameters of all diurnal squamates vary with mean annual temperatures, especially in heliotherms, so that the thermal relations of the various categories are disparate in cold climate but convergent in warm climate. Non-heliotherms and nocturnal body temperatures are better explained by substrate temperature than by air temperature. Body temperature distributions become left-skewed in warmer-bodied species, especially in colder climate.</p> <p><strong>Main</strong> <strong>conclusions</strong>: Differences in squamate body temperatures, their environmental relationships, and frequency distributions are globally influenced by behavioural and climatic factors. Differences between behavioural categories are smaller in warm climates where environmental temperatures are generally favourable, but heliotherm body temperature remained consistently higher than all others.</p>
Field-based body temperatures reveal behavioral thermoregulation strategies of the Atlantic marsh fiddler crab Minuca pugnax
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A global analysis of field body temperatures of active squamates in relation to climate and behaviour
Open the record for dataset details and reuse information.
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