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88 results for “thermal limits”
Data from: The thermal limits of native plant species in California Coastal Sage Scrub
<p>Field and laboratory data for Goldsmith et al. (<em>In Review</em>) entitled, "The thermal limits of native plant species in California Coastal Sage Scrub." Four data files are included: </p> <p><strong><em>Goldsmithetal_PlantFunctionalTraitMetaData-18July24.xlsx </em></strong>-Provides metadata (header, description, units, measurement type, and expample) for each column of the file entitled "<em>Goldsmithetal_PlantFunctionalTraitData-18July24.csv." </em></p> <p><em><strong>Goldsmithetal_PlantFunctionalTraitData-18July24.csv </strong>- </em>Provides raw data for field and lab observations of plant functional traits as described in the methods section of this data record. </p> <p><em><strong>Goldsmithetal_PlantFvFmLabData-29March24.csv </strong>- </em>Provides raw data for experimental lab observations of leaf fv/fm following experimental heat treatments as described in the methods section of this data record. <em><br></em></p> <p><em><strong>Goldsmithetal_PlantFvFmLabMetaData-2Aug23.xlsx</strong> - </em>Provides metadata (header, description, units, measurement type, and expample) for each column of the file entitled "Goldsmithetal_PlantFvFmLabData-29March24.csv." </p> <p> </p> <p>Contact Greg Goldsmith (goldsmith at chapman dot edu) for additional information. </p>
Data from: Oxygen limited thermal tolerance is seen in a plastron breathing insect, and can be induced in a bimodal gas exchanger
<p>Dataset on respiration and ctmax in two freshwater bugs, associated with the paper:<br> <strong>Verberk WCEP & Bilton DT (2015) </strong>Oxygen limited thermal tolerance is seen in a plastron breathing insect, and can be induced in a bimodal gas exchanger. <em>Journal of Experimental Biology </em>218: 2083-2088. doi: 10.1242/jeb.119560</p>
Limited effect of thermal pruning on wild blueberry crop and its root-associated microbiota - Agricultural dataset
<p>These datasets contain all the agricultural data (soil chemistry, blueberry performance, weeds and diseases...) used in our study.</p>
Limited sex differences in plastic responses suggest evolutionary conservatism of thermal reaction norms: A meta-analysis in insects
<p>Temperature has a profound effect on the growth and development of ectothermic animals. However, the extent to which ecologically-driven selection pressures can adjust thermal plastic responses in growth schedules is not well understood. Comparing temperature-induced plastic responses between sexes provides a promising but underexploited approach to evaluating the evolvability of thermal reaction norms: males and females share largely the same genes and immature environments but typically experience different ecological selection pressures. We proceed from the idea that substantial sex differences in plastic responses could be interpreted as resulting from sex-specific life-history optimization, whereas similarity among the sexes should rather be seen as evidence of an essential role of physiological constraints. In this study, we performed a meta-analysis of sex-specific thermal responses in insect development times, using data on 161 species with comprehensive phylogenetic and ecological coverage. As a reference for judging the magnitude of sex-specificity in thermal plasticity, we compared the magnitude of sex differences in plastic responses to temperature with those in response to diet. We show that sex-specific responses of development times to temperature variation are broadly similar. We also found no strong evidence for sex-specificity in thermal responses to depend on the magnitude or direction of sex differences in development time. Sex differences in temperature-induced plastic responses were systematically less pronounced than sex differences in responses induced by variations in larval diet. Our results point to the existence of substantial constraints on the evolvability of thermal reaction norms in insects as the most likely explanation. If confirmed, the low evolvability of thermal response is an essential aspect to consider in predicting evolutionary responses to climate warming.</p>
Figure 1 in Limited thermal plasticity in high mountain tropical water bears
Figure 1. The environmental temperature is depicted in black while the moss temperature is shown in green. Temperatures were recorded every minute from October 18th to November 16th, 2023. Throughout the day, temperatures were not stable. The average environmental temperature was 14.7 °C, ranging from a minimum of 9.3 °C to a maximum of 25.6 °C. The average moss temperature was 14.6 °C, ranging from a minimum of 9.6 °C to a maximum of 23.1 °C.
Fig. 1 in Critical thermal limits of Poecilia caucana (Steindachner, 1880) (Cyprinodontiformes: Poeciliidae)
Fig. 1. Thermal tolerance limits of Poecilia caucana. Values represent mean ± SD in critical thermal limits estimated for each acclimation temperature. Letters represent significant differences in the Tukey post-hoc test using α=0.05.
Fig. 3 in Critical thermal limits of Poecilia caucana (Steindachner, 1880) (Cyprinodontiformes: Poeciliidae)
Fig. 3. Comparison of acclimation capacity for Poecilia caucana (Pc, bold letter and thicker line) and a sample of species with CT and acclimation temperature values available in the literature. Lines join acclimation capacities for CTmin and CT max of the same species, when both values are available. Symbols are jittered in the horizontal axis to avoid crowding. Abbreviations as in Fig. 2 except for Ap = Alosa pseudoharengus (Otto et al., 1976); Cn = Cyprinodon nevadensis (Feldmeth et al., 1974); Cs = Cyprinodon sp. (Otto & Gerking, 1973); Fh = Fundulus heteroclitus (Bulger & Tremaine, 1985); Ga = Gambusia affinis (Otto, 1973, 1974); Oc = Oncorhynchus clarkii (Heath, 1963).
Fig. 2 in Critical thermal limits of Poecilia caucana (Steindachner, 1880) (Cyprinodontiformes: Poeciliidae)
Fig. 2. Comparison of Critical Thermal (CT) limits for Poecilia caucana (Pc, grey polygon) and a sample of species with CTmin and CT max data available in the literature. Polygons are formed by two vertical lines representing the CT tolerance ranges observed at the lowest and highest acclimation temperatures used in each study. The polygons have an arbitrary width that does not reflect the range of acclimation temperatures used among different studies. The top and bottom lines of each polygon join, respectively, the CT max and CTmin values for each species. Three species (N, Ns, and P) having data for only one acclimation temperature are represented by vertical lines. Pf = Prochilodus scrofa (currently Prochilodus lineatus), fry, and Ps = P. scrofa, adults (Barrionuevo & Fernandes, 1995); Ca = Carassius auratus (Ford & Beitinger, 2005); Cc = Catla catla and Cm = Cirrhinus mrigala (Das et al., 2004); Cp = Cyprinus carpio (Chatterjee et al., 2004); Danio rerio, transgenic breed, and D. rerio, wild (Cortemeglia & Beitinger, 2005); Sb = Siphateles bicolor (McClanhan et al., 1986); Lr = Labeo rohita (Chatterjee et al., 2004; Das et al., 2004); N = Notropis chrysocephalus, Ns = N. spilopterus, P = Pimephales notatus (Hockett & Mundahl, 1989); Ro = Rhinichthys osculus (Kaya et al., 1992); Hb = Horabagrus_brachysoma (Dalvi et al., 2009); Ip = Ictalurus punctatus (Currie et al., 1998); Pp = Pangasius pangasius (Debnath et al., 2006); Om = Oncorhynchus mykiss (Currie et al., 1998); Cv = Cyprinodon variegatus (Bennett & Beitinger, 1997); Pc = Poecilia caucana (this study); Xm = Xiphophorus maculatus (Prodocimo & Freire, 2001); Ms = Micropterus salmoides (Currie et al., 1998).
Field and Thermal Emission Limited Charge Injection in Au–C60–Graphene van der Waals Vertical Heterostructures for Organic Electronics (Dataset)
<p>Dataset of the vertical Au-C60-Gr stacks measurements related to the publication: "Field and Thermal Emission Limited Charge Injection in Au–C60–Graphene van der Waals Vertical Heterostructures for Organic Electronics", ACS, Appl. Nano Mater., 2023.</p> <p>The dataset includes:</p> <ol> <li>AFM raw data</li> <li>Raman spectroscopy raw data</li> <li>Room temperature measurements</li> <li>Impedance analysis measurements</li> <li>Temperature dependent measurements</li> </ol> <p> </p>
Data from: Physiological thermal limits predict differential responses of bees to urban heat-island effects
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Limited sex differences in plastic responses suggest evolutionary conservatism of thermal reaction norms: A meta-analysis in insects
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Food limitation erodes the thermal tolerance of larvae in an ecologically influential marine herbivore
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Data from: A resurrection study reveals limited evolution of thermal performance in response to recent climate change across the geographic range of the scarlet monkeyflower
<p>Evolutionary rescue can prevent populations from declining under climate change, and should be more likely at high-latitude, "leading" edges of species' ranges due to greater temperature anomalies and gene flow from warm-adapted populations. Using a resurrection study with seeds collected before and after a seven-year period of record warming, we tested for thermal adaptation in the scarlet monkeyflower <i>Mimulus</i> <i>cardinalis</i>. We grew ancestors and descendants from northern-edge, central, and southern-edge populations across eight temperatures. Despite recent climate anomalies, populations showed limited evolution of thermal performance curves. However, one southern population evolved a narrower thermal performance breadth by 1.31 °C, which matches the direction and magnitude of the average decrease in seasonality experienced. Consistent with the climate variability hypothesis, thermal performance breadth increased with temperature seasonality across the species' geographic range. Inconsistent with performance trade-offs between low and high temperatures across populations, we did not detect a positive relationship between thermal optimum and mean temperature. These findings fail to support the hypothesis that evolutionary response to climate change is greatest at the leading edge, and suggest that the evolution of thermal performance is unlikely to rescue most populations from the detrimental effects of rapidly changing climate.</p>
How dopants limit the ultrahigh thermal conductivity of boron arsenide: a first principles study
<p>The dataset contains the necessary information to reproduce the phonon-defect scattering rates and the phonon thermal conductivity of cubic boron arsenide (BAs) upon doping, via the almaBTE software.</p> <p>Input files contain:</p> <p>1) Interatomic force constants for the pristine BAs, required to extract the phonon band structure and the intrinsic scattering processes;</p> <p>2) Unit cell POSCAR;</p> <p>3) Interatomic force constants for the C, Ge and Si impurities, required to compute the phonon-defect scattering rates beyond the mass-only approximation.</p> <p>Output files contain:</p> <p>1) Phonon-defect scattering rates (mass-only approximation, bond-only approximation, total) for charged and neutral impurities;</p> <p>2) Thermal conductivity at 300 K as function of the impurity concentration.</p> <p> </p>
Data from: Climate variability predicts thermal limits of aquatic insects across elevation and latitude
Janzen's extension of the climate variability hypothesis posits that increased seasonal variation at high latitudes should result in greater temperature overlap across elevations, and favor wider thermal breadths in temperate organisms compared to their tropical counterparts. We tested these predictions by measuring stream temperatures and thermal breadths (i.e. the difference between the critical thermal maximum and minimum) of 62 aquatic insect species from temperate (Colorado, USA) and tropical (Papallacta, Ecuador) streams spanning an elevation gradient of ca. 2000m. Temperate streams exhibited greater seasonal temperature variation and overlap across elevations than tropical streams, and as predicted, temperate aquatic insects exhibited broader thermal breadths than tropical insects. However, elevation had contrasting effects on patterns of thermal breadth. In temperate species, thermal breadth decreased with increasing elevation because CTMAX declined with elevation while CTMIN was similar across elevations. In tropical insects, by contrast, CTMAX declined less sharply than CTMIN with elevation, causing thermal breadth to increase with elevation. These macrophysiological patterns are consistent with the narrower elevation ranges found in other tropical organisms, and they extend Janzen's climate variability hypothesis to freshwater streams. Furthermore, because lowland tropical aquatic insects have the narrowest thermal breadths of any region, they may be particularly vulnerable to short-term extreme changes in stream temperature.
Data from: Day/night upper thermal limits differ within Ectatomma ruidum ant colonies
In the tropics, daily temperature fluctuations can pose physiological challenges for ectothermic organisms, and upper thermal limits may affect foraging activity over the course of the day. Variation in upper thermal limits can occur among and within species, and for social insects such as ants, within colonies. Within colonies, upper thermal limits may differ among individuals or change for an individual throughout the day. Daytime foragers of the Neotropical ant Ectatomma ruidum have higher critical thermal maxima (CTmax) than nocturnal foragers, but whether these differences occur among or within colonies was not previously known. We investigated the potential mechanisms accounting for day/night variation in CTmax of E. ruidum foragers by testing whether CTmax varied among or within colonies or due to individuals within colonies acclimating to changes in temperature over a short time scale (3 h). We found within- but not among-colony differences in CTmax on a diel cycle, and we found no evidence for among- or within-colony partitioning of foraging times by individual workers. Individuals did not acclimate to experimental manipulations of temperature, although additional experiments with more ecologically relevant temperature manipulations are needed to rule out this mechanism. In summary, we have shown that day/night differences in upper thermal limits can occur within ant colonies, but further investigation is needed to elucidate the mechanisms driving this variation.
Effect of thermal variation on the cardiac thermal limits of a eurythermal marine teleost (Girella nigricans)
<p class="MsoNormal">Although most animals live in complex, thermally variable environments, the impact of this variability on specific physiological systems is still unresolved. The ectotherm heart is known to change in both structure and function to ensure appropriate oxygen delivery under different thermal regimes, but the plasticity of the upper thermal limits of the heart under stable or variable thermal acclimation conditions remains unknown. To investigate the role of thermal variability on cardiac acclimation potential, we acclimated a eurythermal fish, opaleye (Girella nigricans), to three static temperature treatments (13, 16, and 19 °C) as well as two oscillating treatments which cycled between maximum and minimum temperatures every 12 h (13–19 °C and 16–22 °C). These temperatures and daily thermal ranges were chosen to mimic the conditions observed in the rocky intertidal environments in Santa Barbara, CA, USA where the fish were collected. We hypothesized that increasing temperature would increase upper thermal limits of the heart, and that variable acclimations would result in broader acute thermal performance curves (TPCs) compared to static acclimations. We measured maximum heart rate during acute warming to determine cardiac thermal performance (i.e., the temperature corresponding to the onset of cardiac arrythmia, the temperature at maximum heart rate, absolute maximum heart rate, and the Arrhenius breakpoint temperature) and construct acute TPCs. Rising static acclimation temperatures increased upper thermal limits but had no impact on peak maximum heart rate. The warmest static temperature did, however, cause a narrowing of the acute TPC. Fish acclimated to variable conditions had the same upper thermal limits compared to fish acclimated to static conditions with the same mean temperature in all metrics of thermal performance. Further, there was no significant broadening of the acute TPC. This study suggests that cardiac plasticity is robust to thermal variation in this eurythermal fish.</p>
Data from: Usefulness and limitations of thermal performance curves in predicting ectotherm development under global change
1. Thermal performance curves (TPCs) have been estimated in multiple temperate ectotherm species and used to predict the effect of global warming. However, TPCs are typically assessed under constant temperature regimes, so their reliability for predicting thermal responses in the wild where temperature fluctuates diurnally and seasonally remains poorly documented. 2. Here we use distant latitudinal populations of five species of sepsid flies (Diptera: Sepsidae) from the temperate region (Europe, North Africa, North America) to compare estimates derived from constant TPCs with observed development rate under fluctuating temperatures in laboratory and field conditions. 3. TPCs changed across gradients in that flies originating from higher latitudes or altitudes showed accelerated development, an adaptive response. TPCs were then used to predict development rates observed under fluctuating temperatures; these predictions were relatively accurate in the laboratory but not in the field. Interestingly, the precision of TPC-predictions depended not only on the resolution of temperature data, with diurnal and overall temperature summing performing better than hourly temperature summing, but also on the frequency of temperatures falling below the estimated critical minimum temperature. Hourly temperature resolution most strongly underestimated actual development rates, because flies apparently either did not stop growing when temperatures dropped below this threshold, or they speed up their growth when the temperature rises again, thus most severely reflecting this error. 4. We conclude that when flies do not encounter cold temperatures, TPC-predictions based on constant temperatures can accurately reflect performance under fluctuating temperatures if adequately adjusted for non-linearities, but when they encounter cold temperatures this method is more error-prone. 5. Our study emphasizes the importance of the resolution of temperature data and cold temperatures in shaping thermal reaction norms, thus improving predictions of the responses of ectotherms to climate change in the age of big data and citizen science.
Limited plasticity in thermally tolerant ectotherm populations: evidence for a trade-off
<p></p><p>Many species face extinction risks owing to climate change, and there is an urgent need to identify which species' populations will be most vulnerable. Plasticity in heat tolerance, which includes acclimation or hardening, occurs when prior exposure to a warmer temperature changes an organism's upper thermal limit. The capacity for thermal acclimation could provide protection against warming, but prior work has found few generalizable patterns to explain variation in this trait. Here, we report the results of, to our knowledge, the first meta-analysis to examine within-species variation in thermal plasticity, using results from 20 studies (19 species) that quantified thermal acclimation capacities across 78 populations. We used meta-regression to evaluate two leading hypotheses. The climate variability hypothesis predicts that populations from more thermally variable habitats will have greater plasticity, while the trade-off hypothesis predicts that populations with the lowest heat tolerance will have the greatest plasticity. Our analysis indicates strong support for the trade-off hypothesis because populations with greater thermal tolerance had reduced plasticity. These results advance our understanding of variation in populations' susceptibility to climate change and imply that populations with the highest thermal tolerance may have limited phenotypic plasticity to adjust to ongoing climate warming.</p><p></p>
Highly conserved thermal performance strategies may limit adaptive potential in corals
<p>Increasing seawater temperatures are expected to have profound consequences for reef-building corals' physiology. Understanding how demography changes in response to chronic exposure to warming will help forecast how coral communities will respond to climate change. Here, we measure growth rates of coral fragments of four common species, while exposing them to temperatures ranging from 19 to 31˚C for one month to calibrate their thermal-performance curves (TPCs). Our results show that, while there are contrasting differences between species, the shape of the TPCs was remarkably consistent among individuals of the same species. The low variation in thermal sensitivity within species may imply a reduced capacity for rapid adaptive responses to future changes in thermal regimes. Additionally, interspecific differences in thermal responses show a negative relationship between maximum growth and thermal optima, contradicting expectations derived from the classic "warmer-is-better" hypothesis. Among species, there was a trade-off between current and future growth, whereby most species perform well under current thermal regimes but are susceptible to future increases in temperature. Increases in water temperature with climate change are likely to reduce growth rates, further hampering future coral reef recovery rates and potentially altering community composition.</p>
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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.
International Brain Laboratory public data
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.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.