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77 results for “Physiology: thermal”
Data from: Physiological responses of scleractinian coral to trace metal enrichment and thermal stress
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Data from: Investigating the effects of thermal variability and heatwaves on pond zooplankton communities and physiological traits
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Data from: Thermal imaging demonstrates physiological responses to grooming interactions and audience effects in wild baboons
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Activity niches outperform thermal physiological limits in predicting global ant distributions
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Data from: Thermal physiology: a new dimension of the pace-of-life syndrome
1) Current syndrome research focuses primarily on behavior with few incorporating components of physiology. One such syndrome is the Pace-of-Life Syndrome (POLS) which describes covariation between behaviour, metabolism immunity, hormonal response, and life history traits. Despite the strong effect temperature has on behavior, thermal physiology has yet to be considered within this syndrome framework. 2) We proposed the POLS to be extended to include a new dimension, the cold-hot axis. Under this premise, it is predicted that thermal physiology and behavior would covary whereby individual positioning along the thermal continuum would coincide with that of the behavioral continuum. 3) This hypothesis was tested by measuring thermal traits of delicate skinks (Lampropholis delicata) and linking it to their behavior. Principal components analysis and structural equation modelling were used to determine if traits were structured within the Pace-of-Life Syndrome (POLS) and to characterize the direction of their interactions. 4) Model results supported the inclusion of the cold-hot axis into the POLS and indicated that thermal physiology was the driver of this relationship, in that thermal traits either constrained or promoted activity, exploration, boldness, and social behavior. 5) This study highlights the need to integrate thermal physiology within a syndrome framework.
Data from: Quantification of correlational selection on thermal physiology, thermoregulatory behavior and energy metabolism in lizards
Phenotypic selection is widely accepted as the primary cause of adaptive evolution in natural populations, but selection on complex functional properties linking physiology, behavior, and morphology has been rarely quantified. In ectotherms, correlational selection on thermal physiology, thermoregulatory behavior, and energy metabolism is of special interest because of their potential coadaptation. We quantified phenotypic selection on thermal sensitivity of locomotor performance (sprint speed), thermal preferences, and resting metabolic rate in captive populations of an ectothermic vertebrate, the common lizard, Zootoca vivipara. No correlational selection between thermal sensitivity of performance, thermoregulatory behavior, and energy metabolism was found. A combination of high body mass and resting metabolic rate was positively correlated with survival and negatively correlated with fecundity. Thus, different mechanisms underlie selection on metabolism in lizards with small body mass than in lizards with high body mass. In addition, lizards that selected the near average preferred body temperature grew faster that their congeners. This is one of the few studies that quantifies significant correlational selection on a proxy of energy expenditure and stabilizing selection on thermoregulatory behavior.
Data from: Integrating thermal physiology within a syndrome: locomotion, personality and habitat selection in an ectotherm
1. Physiology and temperature can both have a profound influence on behaviour and metabolism. Despite this, thermal physiology has rarely been considered within the animal personality framework, but could be an inherent mechanism maintaining consistent individual differences in behaviour, particularly in species that need to thermoregulate (i.e. ectotherms). 2. Here, we present evidence for a thermal-behavioural syndrome and detail how it is linked to variation in habitat selection in an Australian lizard, the delicate skink, Lampropholis delicata. 3. We predicted that individuals would occur along a cold-hot continuum – analogues to the slow-fast continuum proposed by the pace-of-life hypothesis - whereby an individual's placement along a thermal physiological axis will correspond with their placement along a personality axis. We first tested the thermal-behavioural syndrome by measuring the thermal preferences and optimal performance temperature of individual skinks and linking it to their activity, exploratory, social and boldness behaviours. 4. In line with our predictions, we found that individuals with a 'hot' thermal type performed optimally at higher temperatures, had faster sprint speeds and were more active, explorative and bold relative to 'cold' thermal types. 5. We then monitored each individual's habitat selection within an artificial environment containing three microhabitats differing in their thermal characteristics. 6. We found that an individual's thermal type mediated their use of habitat, in which 'hot' individuals utilised a hotter microhabitat more regularly than both 'cold' and 'intermediate' thermal types, suggesting that the thermal-behavioural syndrome could drive ecological niche partitioning in this species. 7. We envisage that the thermal-behavioural syndrome concept is likely to extend to other study systems, particularly to ectothermic organisms that rely heavily on behavioural thermoregulation to maintain optimal body temperature.
Data from: Can physiological engineering/programming increase multi-generational thermal tolerance to extreme temperature events?
Organisms increasingly encounter higher frequencies of extreme weather events as a consequence of global climate change. Currently, few strategies are available to mitigate climate change effects on animals arising from acute extreme high temperature events. We tested the capacity of physiological engineering to influence the intra- and multi-generational upper thermal tolerance capacity of a model organism Artemia, subjected to extreme high temperatures. Enhancement of specific physiological regulators during development could affect thermal tolerances or life-history attributes affecting subsequent fitness. Using experimental Artemia populations we exposed F0 individuals to one of four treatments; heat hardening (28 &[deg]C to 36 &[deg]C, 1 &[deg]C per 10 minutes), heat hardening plus serotonin (0.056 μg ml-1), heat hardening plus methionine (0.79 mg ml-1), and a control treatment. Regulator concentrations were based on previous literature. Serotonin may promote thermotolerance, acting upon metabolism and life-history. Methionine acts as a methylation agent across generations. For all groups, measurements were collected for three performance traits of individual thermal tolerance (upper sublethal thermal limit, lethal limit, and dysregulation range) over two generations. Results showed no treatment increased upper thermal limit during acute thermal stress, although serotonin-treated and methionine-treated individuals outperformed controls across multiple thermal performance traits. Additionally, some effects were evident across generations. Together these results suggest phenotypic engineering provides complex outcomes; and if implemented with heat hardening can further influence performance in multiple thermal tolerance traits, within and across generations. Potentially, such techniques could be up-scaled to provide resilience and stability in populations susceptible to extreme temperature events.
Heterogeneous environmental seascape across a biogeographic brake influences the thermal physiology and tolerances to ocean acidification in an ecosystem
<p><b>Aim:</b> Understanding how spatio-temporal environmental variability influences stress tolerance, local adaptation, and phenotypic variation among populations is a key challenge for evolutionary ecology and climate change biology. Coastal biogeographic breaks are natural laboratories to explore this fundamental research question due to the contrasting environmental conditions experienced by natural populations across these regions.</p> <p><b>Location:</b> In the South East Pacific (SEP) coast a major break (30º-32ºS) is characterized by extreme natural variability in sea surface temperature (SST) and carbonate chemistry parameters related to temporal and spatial dynamics in upwelling events. Calcifying organisms inhibiting this zone are exposed to marked fluctuations and clines in SST that together with naturally acidified waters can impact their metabolism, calcification and fitness, making them particularly prone to the effects of climate change (e.g., ocean acidification, OA). We investigated to what extent the spatial and temporal environmental variability (in SST and seawater carbonate conditions) that characterizes the biogeographic break in the SEP, influences intra-specific differences in the thermal ecology and the tolerances to OA of the limpet <i>Scurria araucana</i>.</p> <p><b>Methods: </b>During two years, we conducted field surveys of limpet populations at sites across the SEP break (27ºS, 30ºS and 32ºS). We collected individuals from each population to test for geographic differences in morphometric (e.g., total buoyancy weight, shell length) and physiological (e.g., oxygen consumption rate, cardiac activity, and thermal performance curves; TPC) responses to local environmental conditions (Tº and pH/pCO<sub>2</sub>) and to simulated OA scenarios.</p> <p><b>Results:</b> Populations of <i>S. Araucana </i>exhibit high tolerance to OA with no signal of geographic influence on this attribute. However, inter-population differences in thermal physiology (metabolic rates and performances) where found across the biogeographic break in the SEP coast. Limpets from the central part of the break (30ºS) exhibit higher thermal performance compared to limpets from populations at both sides of the break.</p> <p><b>Main conclusions:</b> Variation in SST has a greater effect shaping inter-population differences in thermal physiology of the limpet <i>S. araucana</i>. These physiological differences<i> </i>are aligned the thermal heterogenous seascape along the biogeographic break in the SEP. Contrary, temporal and spatial variation in seawater carbonate conditions does not influence inter-population differences in phenotypic response populations, but an overall high tolerance to OA.</p>
The structure of the thermal landscape determined behavioral and physiological responses to simulated predation risk_data
<p><span>Although predators can deter an animal from regulating its body temperature by basking or shuttling, this response to predation should depend on the spatial distribution of thermal resources.</span><span> </span></p> <p><span><span>By </span><span>simulating predation risk, we showed that movement, thermoregulation, and corticosterone of male lizards (<em>Sceloporus jarrovi</em>) depended on the spatial distribution of shade.</span></span></p> <p><span><span>Simulated risk caused lizards to move less, thermoregulate worse, and circulate more corticosterone than they did without risk. However, a patchier distribution of shade enabled lizards to move more, thermoregulate better, and circulate less corticosterone when exposed to a simulated predator.</span></span></p> <p><span><span>In the absence of simulated risk, lizards in patchier environments moved less, thermoregulated better, and circulated less corticosterone, indicating the distribution of shade also affected the energetic cost of thermoregulation.</span></span></p> <p><span><span>This study provides the first test of a spatial theory of thermoregulation under the perceived risk of predation.</span></span></p>
Data for: Multi-scale relationships in thermal limits within and between two cold-water frog species uncover different trends in physiological vulnerability
<ol> <li>Critical thermal limits represent an important component of an organism's capacity to cope with future temperature changes. Understanding the drivers of variation in these traits may uncover patterns in physiological vulnerability to climate change. Local temperature extremes have emerged as a major driver of thermal limits, although their effects can be mediated by the exploitation of fine-scale spatial variation in temperature through behavioral thermoregulation.</li> <li>Here, we investigated thermal limits along elevation gradients within and between two cold-water frog species (<em>Ascaphus</em> spp.), one with a coastal distribution (<em>A. truei</em>) and the other with a continental range (<em>A. montanus</em>). We quantified thermal limits for over 700 tadpoles, representing multiple populations from each species. We combined local temporal and fine-scale spatial temperature data to quantify local thermal landscapes (i.e., thermalscapes), including the opportunity for behavioral thermoregulation.</li> <li>Lower thermal limits for either species could not be reached experimentally reached without the water freezing, suggesting that cold tolerance is <0.3℃. In contrast, upper thermal limits varied among populations, but this variation only reflected local temperature extremes in <em>A. montanus</em>, perhaps due to greater variation in stream temperatures across its range. Lastly, we found minimal fine-scale spatial variability in temperature, suggesting limited opportunity for behavioral thermoregulation and thus increased vulnerability to warming for all populations.</li> <li>By quantifying local thermalscapes, we uncovered different trends in the relative vulnerability of populations across elevation for each species. In <em>A. truei</em>, physiological vulnerability decreased with elevation, whereas in <em>A. montanus</em>, all populations were equally physiologically vulnerable. These results highlight how similar environments can differentially shape physiological tolerance and patterns of vulnerability of species, and in turn, impact their vulnerability to future warming. </li> </ol>
Data from: Can physiological engineering/programming increase multi-generational thermal tolerance to extreme temperature events?
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Data from: Thermal physiology: a new dimension of the pace-of-life syndrome
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Data from: Effects of hypoxia on the thermal physiology of a high-elevation lizard: Implications for upslope-shifting species
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The structure of the thermal landscape determined behavioral and physiological responses to simulated predation risk_data
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Phenotypic plasticity is not a cline: thermal physiology of an intertidal barnacle over 20 degrees of latitude
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Data from: Physiology at near-critical temperatures, but not critical limits, varies between two lizard species that partition the thermal environment
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Heterogeneous environmental seascape across a biogeographic brake influences the thermal physiology and tolerances to ocean acidification in an ecosystem
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Thermal performance curves dataset based on <em>Littorina littorea</em> from different locations along a latitudinal gradient: Physiological and life history traits
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Data from: Physiological and genomic signatures of evolutionary thermal adaptation in redband trout from extreme climates
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
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