The upper temperature thresholds of life

Temperature affects many life processes, but its effect might be expected to differ among eukaryotic organisms inhabiting similar environments. We reviewed literature on temperature thresholds of humans, livestock, poultry, agricultural crops, and sparse examples fisheries. found that preferable harmful temperatures are for cattle, pigs, fish, crops. Preferable range from 17°C 24°C. Stress lower when humidity is higher. However, extended exposure above 25°C with high can cause heat stress in organisms. Short exposures 35°C humidity, or 40°C low lethal. Increases exposure, frequency, duration stressful lethal increase the physiological bodily damage suffered by an integral feature habitats all most investigated physical impact parameter. physical, chemical, biological, ecological factors at scales. For example, influencing states matter, determines whether frost forms a leaf sweat evaporates skin. influences dissolution diffusion rate essential chemicals thermodynamics metabolic reactions. At cellular level, affect fluidity membranes, folding proteins, regulation gene expression; indicators strain include protein alteration fluctuations profiles tissues.1Abdelnour SA Abd El-Hack ME Khafaga AF Arif M Taha AE Noreldin biomarkers proteomics thermal ruminants: review.J Therm Biol. 2019; 79: 120-134Crossref PubMed Scopus (55) Google Scholar macroecological influence abundance food, water, competitors predators,2Prosser CL Hildebrandt G Hensel H Biological adaptation. Georg Thieme, Stuttgart1982: 2-22Google depending species, also development, maturation, reproduction, migration, dormancy. Habitat different ecosystems naturally fluctuate according daily seasonal cycles; however, living subject intermittent extreme events. Although ectotherms endotherms known respond differently elevated ambient temperature, this Personal View will focus plants. The effects influenced other key parameters, such as pressure, light, ultraviolet radiation, air composition. discuss experimental evidence upper some results context climate change. Living develop best their (ie, thermoneutral) zone. In View, we refer these conditions comfort preference animals, optimal which minimal effort needed maintain reproductivity. Beyond thermoneutral zone, lead strain—ie, responses body. An endothermal body produces own reactions activities like walking lifting, gains solar radiation. Humans animals dissipate by: convection warms air; conduction direct contact surface; respiration inhaling cool dry exhaling moist warm evaporation sweating; radiation.3Koppe C Kovats S Jendritzky Menne B Health global environmental change—series, no 2. World Organization Regional Office Europe, 2004https://www.euro.who.int/__data/assets/pdf_file/0008/96965/E82629.pdfDate accessed: December 15, 2020Google Scholar, 4Habeeb AA Gad Atta MA Temperature-humidity indices climatic relation production reproduction farm animals.Int J Recent Adv Biotechnol. 2018; 1: 35-50Crossref Heat starts body's loss less than gain, causing increase. When skin exceeds radiation contribute instead gain. if there surfaces temperatures, rocks, concrete, asphalt, gain; only effective dissipative mechanisms function circumstances sweating (eg, humans horses), panting unable efficiently, dogs, poultry). To estimate load borne organism, information parameters determining exchange needed. These movement, precipitation. degree strain, reaction required. There numerous approaches characterise conditions) organisms). More 100 have been proposed describe alone, ranging simple relationships highly sophisticated models.5Havenith Fiala D Thermal thermophysiological modeling stress.Compr Physiol. 2015; 6: 255-302Crossref (135) Simple consider mostly humidity. advanced based mathematical modelling human passive (physiological) active (behavioural) incorporating central nervous system (CNS).5Havenith complex use detailed, three-dimensional geometry were developed model monitor people working dangerous conditions, furnace workers, military personnel, athletes. Despite complexity, do not accumulation over time, they applied repeatedly accumulated. prone uncertainties arising large individual variability input including sex, ethnicity, age, fitness state, factors, particular social aspects.6Campbell Remenyi TA White CJ Johnston FH Heatwave health research: review.Health Place. 53: 210-218Crossref (127) Thus, income those isolation much capacity mitigate unfavourable others. Children (<5 years) older (>60 years), pre-existing chronic likely more sensitive healthy adults.7Bunker A Wildenhain Vandenbergh et al.Effects climate-sensitive mortality morbidity outcomes elderly; systematic review meta-analysis epidemiological evidence.EBioMedicine. 2016; 258-268Summary Full Text PDF (213) 8Basagaña X Sartini Barrera-Gómez al.Heat waves cause-specific ages.Epidemiology. 2011; 22: 765-772Crossref (158) Most focused imminent short-term risk heat,5Havenith Predicted Strain index (PHS)9Malchaire JBM Occupational assessment model.Ind Health. 2006; 44: 380-387Crossref (72) 10Wang F Gao Kuklane K Holmér I Effects various protective clothing environments unacclimated men: PHS (Predicted Strain) revisited.Ind 2013; 51: 266-274Crossref (36) Wet Bulb Globe index, was declared International Labour “the common occupational health”.11Kjellstrom T Maître N Saget Otto Karimova Working warmer planet: labour productivity decent work. Labor Organization, Geneva2019Google All affected change vary across kingdoms geographies. increases change,12Intergovernmental Panel Climate ChangeClimate land. IPCC special report change, desertification, land degradation, sustainable management, food security, greenhouse gas fluxes terrestrial ecosystems.https://www.ipcc.ch/site/assets/uploads/2019/11/SRCCL-Full-Report-Compiled-191128.pdfDate: 2019Date indirect consequences society. High functioning growth livestock yield Organisms react physiologically changing behaviour. Physiological increased heart rate, vasodilatation, sweating, muscle cramps (an early symptom illness). leads reduced beef dairy chickens, resulting yields reproductivity.13Hansen PJ mammalian reproduction.Philos Trans R Soc Lond Biol Sci. 2009; 364: 3341-3350Crossref (387) milk lactating cows 10–20%.4Habeeb Behavioural coping drinking more, eating less, limiting activity, and, dressing appropriately. Increased water salt has compensated intake avoid dehydration. Dairy severe dehydration 12% bodyweight lost camels Bedouin goats, occurs 30–40% loss.14Polsky L von Keyserlingk MAG Invited review: cattle welfare.J 2017; 100: 8645-8657Summary (294) very becomes Strategies mitigating increasing often require additional resources therefore accessible everyone, could include: natural shading trees) built shading; redesign cities buildings lighter, reflective roof wall colours, improved insulation, windows away rising setting sun direction); airflow, indoor air-conditioning, personal cooling systems.15Lai DD Wei FR Lu YH Wang FM Evaluation hybrid using manikin operated constant mode thermoregulatory control conditions.Text Res J. 87: 46-56Crossref (24) farming, barn designs reduce location, devices fans used promote cooling. still raised outside, particularly during summer months (mostly due radiation) become issue. international expert group Universal Index (UTCI) initiative Society Biometeorology provide easy-to-use measures wind, input.16Blažeczyk al.An introduction (UTCI).Geogr Pol. 86: 5-10Crossref (179) 17Bröde P B?azejczyk al.The UTCI compared ergonomics standards assessing environment.Ind 16-24Crossref (73) model, UTCI-Fiala model,18Fiala Havenith Bröde Kampmann multi-node transfer regulation.Int Biometeorol. 2012; 56: 429-441Crossref (439) combines man, dynamic multinode state-of-the-art temperature-adaptive insulation outdoor conditions.19Havenith UTCI-clothing model.Int 461-470Crossref (187) Since Blažeczyk colleagues set standard, typical person modelled adequately dressed man 73·5 kg, surface area 1·86 m2, fat content 14%, about 135 W/m2 (the equivalent 4 km/h).16Blažeczyk considers mass within CNS. uses reference environment would elicit actual radiation), production; shivering; wettedness; blood flow; changes mean rectal, skin, face temperature. same one, 50% relative (capped 20 hPa higher 29°C), irradiation radiant equal temperature), calm (wind velocity 0·5 m/s 10 m ground). W/m2. depends wind speed, temperature,16Blažeczyk characterises net energy caused shortwave longwave fluxes. exact computation time-consuming, it substituted six-order polynomial equation sufficient accuracy average root square error 1·1°C.20Bröde B?a?ejczyk al.Deriving operational procedure (UTCI).Int 481-494Crossref (429) forecast21Pappenberger Staiger al.Global forecasting hazards: skill probabilistic predictions 59: 311-323Crossref (65) climatology22Di Napoli Pappenberger Cloke HL Assessing heat-related Europe via 62: 1155-1165Crossref (99) calculable data meteorological service. comfortable 17–24°C, degrees (figure 1A). According UTCI, mild 23°C 27°C medium considered strong (or severe) 32°C, 36°C, threshold clearly crucial indicator contributes amount strain. predicts rectal athletic person. should 5% mass. exceed 38°C prevent Both (maximum temperature) person's possible time hot without permanent negative consequences. humid (100% humidity), 6 h exceeded 31°C, whereas tolerable 42°C humidity). Note personnel athletes representative whom applicable. As Mora colleagues43Mora Dousset Caldwell IR deadly heat.Nat Clim Chang. 7: 501-506Crossref (560) showed analysing documented events around world, any period 32°C 50°C Similar obtained Sherwood Huber,44Sherwood SC Huber adaptability limit stress.Proc Natl Acad Sci USA. 2010; 107: 9552-9555Crossref (523) who argued exposed wet bulb exceeding periods because cannot dissipated environment. emphasise curve presented figure 1A empirical derived death statistics populations.43Mora reflect deaths susceptible part population young children, people, morbidities) course differs curves stronger dependence (not shown).45Steadman RG sultriness. Part I: temperature-humidity physiology science.J Appl Meteorol. 1979; 18: 861-873Crossref (636) corresponds moderate (>50%) 5–10°C (<30%). levels classes (mild, medium, strong, extreme) 5°C apart each other. time9Malchaire shown) slightly 1–2°C. (>60%) prevents transpiration impractical diversity shapes, sizes, heat-defence responses. farmers Humidity (THI).4Habeeb Expressed single value, biometric does even though substantially itself.4Habeeb unique THI geographical animal size, yield, several factors.4Habeeb 14Polsky one widely especially cows, easy calculate apply, predict accurately quickly, many, all, domestic confined barns where movement effectively blocked.46Li S, Gebremedhin K, Lee CN, Collier RJ. cattle. American Agricultural Engineers Annual Meeting; Reno, NV; Jun 21–24, 2009 (abstr).Google First quantify discomfort felt Thom,47Thom EC index.Weatherwise. 1959; 12: 57-61Crossref Bianca,48Bianca W Relative importance dry- wet-bulb cattle.Nature. 1962; 195: 251-252Crossref (102) Berry colleagues49Berry IL Shanklin MD Johnson HD shelter design: decline humidity.Trans ASAE. 1964; 329-331Crossref concept imposed livestock. Several equations THI. formula, (°C) RH (%), National Research Council50US CouncilA guide research animals. Academy Sciences, Washington, DC1971Google research:51Galán E Llonch Villagrá Levit Pinto del Prado non-productivity-related animal-based resilience cattle.PLoS One. 2008; 13e0206520Google THI=(1.8×T+32)-[(0.55-0.0055×RH)+(1.8×T-26)] 72 traditionally recognised production.52Ravagnolo O Misztal Hoogenboom Genetic component development function.J 2000; 83: 2120-2125Summary recent indicate 68,53Collier RJ, Zimbelman RB, Rhoads RP, ML, Baumgard LH. re-evaluation (THI) black globe (BGHI) producing cows. Western Management Conference; March 9–11, 2011.Google 65,54Ouellet V Cabrera VE Fadul-Pacheco Charbonneau É relationship between number consecutive days Holstein continental climate.J 102: 8537-8545Summary (22) 62,55Hammami Bormann M'hamdi Montaldo HH Gengler traits somatic cell score Holsteins temperate environment.J 96: 1844-1855Summary (128) 60,56Brügemann Gernand Borstel UU König analyses applying random regression models time-dependent x humidity-dependent covariates.J 94: 4129-4139Summary (75) sensitivity reared. Furthermore, Ouellet colleagues54Ouellet animal's detected calves proper important gauge experienced statistically significant economical feed intake, milk, meat, egg production, shown studies turkeys.57St-Pierre NR Cobanov Schnitkey Economic losses US industries.J 2003; e52-e77Summary (1016) Regarding tolerance 1B) seems quite 1A),58Spänkuch Auswirkungen des Klimawandels auf Natur und Gesellschaft Europa.Sitzungsberichte der Leibniz-Sozietät. 129: 129-147Google although start high-yielding pigs (leading fattening) 24°C 29°C humidity.59Schauberger Mikovits Zollitsch warming buildings: efficacy adaptation growing-fattening pigs.Clim Change. 156: 567-587Crossref (16) sheep, 22°C humidity) 26°C >28°C reported Marai colleagues.60Marai IFM Bahgat LB Shalaby TH Abdel-Hafez Response male lambs concentrate mixtures given clay under Egypt conditions.Ann Arid Zone. 39: 449-460Google Rabbits 1B), probably basal zone 21°C.23Marai Habeeb AAM Rabbits' productive, reproductive performance stress: review.Livest Prod 2002; 78: 71-90Summary (178) poultry 15–20°C, chickens initial 24°C; 24°C, activated protect Mild noticeable 30°C above, laying 37°C above.61Mignon-Grasteau Moreri U Narcy al.Robustness hens: meta-analysis.Poult 586-600Crossref (51) zones surprising core 35–39°C.13Hansen Specifically strategies modifications thermoregulation; nutritional interventions intakes compensate consumption; genetic selection