A new look at survival times during cold water immersion
Publication date: Available online 18 September 2018Source: Journal of Thermal BiologyAuthor(s): Xiaojiang Xu, Gordon G. GiesbrechtAbstractThis paper presents an expanded dataset for survival times during cold water immersion. In 1946, the first set of human data for cold water survival was derived from the US Navy medical reports during WWII. Although this is the largest and most widely used data source, it has only 23 data points and immersion times are less than 5.5 hour for water temperature below 20 °C. For the new dataset, data (i.e., immersion times, water temperatures, clothing worn, and in some cases...
Source: Journal of Thermal Biology - September 19, 2018 Category: Biology Source Type: research

Honey bees are larger and live longer after developing at low temperature
Publication date: Available online 18 September 2018Source: Journal of Thermal BiologyAuthor(s): Hajnalka Szentgyörgyi, Krystyna Czekońska, Adam TofilskiAbstractHoney bees (Apis mellifera) are known to be temperature specialist and actively maintain brood temperature in a very narrow temperature range. Developing larvae are sensitive to changes of temperature in the nest. Temperatures lower than generally assumed as optimal have been shown to cause a number of negative developmental and behavioural changes in honey bees. We have reared both worker and drone larvae during the capped brood stage in cold (32 °C...
Source: Journal of Thermal Biology - September 18, 2018 Category: Biology Source Type: research

The preferred and avoidance temperatures of Thermocyclops crassus (Fischer, 1853) and their relation to the temperature of optimal, pessimal and normal performance of the species
Publication date: Available online 14 September 2018Source: Journal of Thermal BiologyAuthor(s): Vladimir B. Verbitsky, Valentina I. Lazareva, Elena N. Medyantseva, Olga A. Malysheva, Svetlana M. Zhdanova, Tamara I. Verbitskaya, Andrey K. GrishaninGraphical abstract (Source: Journal of Thermal Biology)
Source: Journal of Thermal Biology - September 15, 2018 Category: Biology Source Type: research

Could FA-PG-SPIONs act as a hyperthermia sensitizing agent? An in vitro study
Publication date: Available online 14 September 2018Source: Journal of Thermal BiologyAuthor(s): Hamid Fakhimikabir, Mohamad Bagher Tavakoli, Ali Zarrabi, Alireza Amouheidari, Soheila RahgozarAbstractThe therapeutic effect of polyglycerol coated iron oxide nanoparticles (PG-SPIONs, non-targeted nanoparticles) and folic acid-conjugated polyglycerol coated iron oxide nanoparticles (FA-PG-SPIONs, targeted nanoparticles) in combination with hyperthermia on viability of HeLa cells was investigated. It was observed that coated and uncoated SPIONs have spherical shapes with an average diameter of 17.9±2.85 nm and 5.4&...
Source: Journal of Thermal Biology - September 15, 2018 Category: Biology Source Type: research

Impact of short- and long-term heat stress on reproductive potential of Drosophila suzukii Matsumura (Diptera: Drosophilidae)
This study provides basic information on thermal biology of D. suzukii to help us better understand the trends commonly observed in D. suzukii trap captures in regions with hot summer conditions, and the results can be used in population models to predict its population dynamics in regions where high temperatures prevail during the field season. (Source: Journal of Thermal Biology)
Source: Journal of Thermal Biology - September 15, 2018 Category: Biology Source Type: research

Water temperature modifies the acute stress response of European sea bass, Dicentrarchus labrax L. (1758)
Publication date: Available online 13 September 2018Source: Journal of Thermal BiologyAuthor(s): Samaras Athanasios, Papandroulakis Nikos, Lika Konstadia, Pavlidis MichailAbstractThe effects of water temperature (15, 20 and 25 °C) on the stress response of European sea bass, Dicentrarchus labrax, were studied. Blood and water samples were collected prior and at 0.5, 1, 2, 4 and 8 hours post-stress for hormonal and biochemical analysis. Water temperature affected the resting concentrations of all stress indicators examined, as well as their response after stress, apart from lactate which response was unaffecte...
Source: Journal of Thermal Biology - September 14, 2018 Category: Biology Source Type: research

Identification and characterization of the catalase gene involved in resistance to thermal stress in Heortia vitessoides using RNA interference
Publication date: Available online 13 September 2018Source: Journal of Thermal BiologyAuthor(s): Jie Cheng, Chun-Yan Wang, Zi-Hao Lyu, Jing-Xiang Chen, Tong LinAbstractTo elucidate the role of catalase (CAT) in Heortia vitessoides Moore, which is one of the most destructive defoliating pests in Aquilaria sinensis (Loureiro) Sprenger forests, a CAT gene (HvCAT) was identified in the transcriptome of adult H. vitessoides. Sequence analyses indicated that HvCAT encodes a protein containing 507 amino acids, including a proximal active site sequence (FXRERIPERVVHAKGXGA), heme-ligand sequence (RLFSYNDTX), heme-binding residues (...
Source: Journal of Thermal Biology - September 14, 2018 Category: Biology Source Type: research

The emergence emergency: a mudskipper's response to temperatures
This study examined the relationship between prolonged (5 weeks) exposure to a range of temperatures (22, 25, 28, or 32 °C) on oxygen uptake rate and movement behaviours (i.e., thermoregulation and emergence) in a common amphibious fish, the barred mudskipper (Periophthalmus argentilneatuis). At the highest temperature examined (32 °C, approximately 5 °C above their summer average temperatures), barred mudskippers exhibited 33.7 to 97.7% greater oxygen uptake rates at rest (ṀO2Rest), emerged at a higher temperature (CTe; i.e., a modified critical thermal maxima (CTMax) methodology) of 41.3&plus...
Source: Journal of Thermal Biology - September 12, 2018 Category: Biology Source Type: research

Effects of developmental acclimation on fitness costs differ between two aphid species
Publication date: Available online 11 September 2018Source: Journal of Thermal BiologyAuthor(s): Jun-Yu Cao, Kun Xing, Hui-Ping Liu, Fei ZhaoAbstractMost ectotherms are able to increase their tolerance to heat stress via the acclimation response. However, there is ongoing debate about whether the acclimation response is associated with fitness costs, and what factors can affect the consequences of acclimation are still unclear. To elucidate this, we sought to determine whether fitness costs varied with acclimation conditions in two cereal aphids, Sitobion avenae and Rhopalosiphum padi. Thus, the basal and inducible thermal...
Source: Journal of Thermal Biology - September 12, 2018 Category: Biology Source Type: research

A new local index for predicting local thermal response of individual body segments
Publication date: Available online 10 September 2018Source: Journal of Thermal BiologyAuthor(s): Negin Moallemi Khiavi, Mehdi Maerefat, Seyed Alireza ZolfaghariAbstractPhysiologically, the thermal sensation/perception of human body is related to the response of cutaneous thermoreceptors (TRs) to the environment. However, the thermal response of skin warm and cold TRs is a function of two important factors: TRs temperatures and their time derivative at the subcutaneous locations of TRs. The available thermal models based on TRs response consider the same sensitivity for all thermal receptors of body. Thus, they estimate an ...
Source: Journal of Thermal Biology - September 11, 2018 Category: Biology Source Type: research

Scrotal Infrared Digital Thermography Predicts Effects of Thermal Stress on Buffalo (Bubalus bubalis) Semen
The objective was to use scrotal infrared digital thermography to evaluate effects of thermal stress on semen quality of Murrah buffalo (Bubalus bubalis) breeding bulls. Ejaculates from 109 Murrah bulls maintained at three semen stations were evaluated for: ejaculate volume, sperm concentration (SCON), initial motility (IM), percent live sperm (LIVE), acrosome integrity of fresh semen (AIFS), plasma membrane integrity of fresh semen (PMIFS), head abnormalities of fresh semen (HAFS), midpiece abnormalities of fresh semen (MPAFS), tail abnormalities of fresh semen (TAFS), post-thaw motility (PTM), acrosome integrity of post-...
Source: Journal of Thermal Biology - September 11, 2018 Category: Biology Source Type: research

Editorial Board
Publication date: October 2018Source: Journal of Thermal Biology, Volume 77Author(s): (Source: Journal of Thermal Biology)
Source: Journal of Thermal Biology - September 7, 2018 Category: Biology Source Type: research

A New Occupational Heat Tolerance Test: A Feasibility Study
This study aimed to assess the validity and reliability of a new heat occupational tolerance test (HOTT: 40 min at 6 W.kg-1 metabolic heat production, 50 °C 10% RH, in protective clothing) to the standard heat tolerance test (HTT: 2 hr walk at 5 km.hr-1 1% gradient, 40 °C 40% RH, in shorts and t-shirt). Eighteen participants (age: 21±3 yrs, body mass: 81.3±5.9 kg) completed trials to assess the validity and/or reliability of the HOTT. Peak rectal temperature (Tre) displayed strong agreement and low measurement error (0.19 °C) between HTT (38.7±0....
Source: Journal of Thermal Biology - September 5, 2018 Category: Biology Source Type: research

Thermal preferences of bird schistosome snail hosts increase the risk of swimmer's itch
Publication date: Available online 29 August 2018Source: Journal of Thermal BiologyAuthor(s): Elżbieta Żbikowska, Anna MarszewskaAbstractAmbient temperature strongly affects host parasite interactions, especially when both are ectothermic. Bird schistosomes, which cercariae are known as agents of swimmer's itch and their snail hosts can be a good example of this phenomenon. The snails of these parasites play the key role, as the source of harmful larvae. Cercarial dermatitis is noted even in areas when prevalence of parasites in snail populations is very low. The main question is what adaptation in snail-fluke associatio...
Source: Journal of Thermal Biology - August 30, 2018 Category: Biology Source Type: research

Saturated fatty acids may ameliorate environmental heat stress in broiler birds by affecting mitochondrial energetics and related genes
This study was conducted to determine the effect of four fat types on mitochondrial energetics in heat-stressed broilers. In experiment 1, nitrogen-corrected apparent metabolizable energy (AMEn) content of four supplemental fat sources, including olive oil, soybean oil, coconut oil and beef tallow, all supplemented at 3, 6, and 9% in the basal diet, was evaluated. The AMEn values of fats were determined as 9738.0±137.9, 8949.0±159.9, 7844.0±91.7, and 7368.0±190.3 kcal/kg for olive oil, soybean oil, coconut oil and beef tallow, respectively. In experiment 2, birds were kept in two separated ...
Source: Journal of Thermal Biology - August 29, 2018 Category: Biology Source Type: research

Monitoring foot surface temperature using infrared thermal imaging for assessment of hoof health status in cattle: a review
Publication date: Available online 25 August 2018Source: Journal of Thermal BiologyAuthor(s): Lokesh Babu D.S., S. Jeyakumar, Patil Jitendra Vasant, M. Sathiyabarathi, A. Manimaran, A Kumaresan, Heartwin A. Pushpadass, M. Sivaram, K.P. Ramesha, Mukund A. Kataktalware, SiddaramannaAbstractDetection of lameness early in cows is important from the animal welfare point of view and for reducing economic losses. Currently, many studies are being conducted for assessment of hoof health status by measuring the surface temperature of skin in cattle and other animal species in different parts of the world. Infrared Thermography (IRT...
Source: Journal of Thermal Biology - August 26, 2018 Category: Biology Source Type: research

Impact of different seasons on the milk somatic and differential cell counts, milk cortisol and neutrophils functionality of three Indian native breeds of cattle
Publication date: Available online 25 August 2018Source: Journal of Thermal BiologyAuthor(s): Mohanned Naif Alhussien, Ajay Kumar DangAbstractThe present study was undertaken to compare the effect of different seasons on the mammary immunity of three Indian native breeds of cows (Tharparkar, Gir and Sahiwal) well adapted to the tropical region. For this milk samples were collected from cows in winter (THI=57, comfortable zone), hot-dry (HD; THI=76, heat stressful zone) and hot-humid (HH; THI= 82, severe heat stress) and estimated for milk somatic cell counts (SCC), phagocytic activity (PA) of milk neutrophils, milk cortiso...
Source: Journal of Thermal Biology - August 26, 2018 Category: Biology Source Type: research

Uncoupling psychological from physiological markers of heat acclimatization in a military context
Publication date: Available online 24 August 2018Source: Journal of Thermal BiologyAuthor(s): Alexandra Malgoyre, Pierre-Emmnauel Tardo-Dino, Nathalie Koulmann, Benoit Lepetit, Loïc Jousseaume, Keyne CharlotAbstractHeat acclimatization may help personnel who travel to areas with a hot climate (WBGT>27 °C), making them operationally more efficient and performant through improvements in physiological and psychological parameters. Their work-related physical activities may aid active heat acclimatization. However, it is unknown whether adding physical training to improve adaptation is effective, particularly ...
Source: Journal of Thermal Biology - August 25, 2018 Category: Biology Source Type: research

Sex difference in cold perception and shivering onset upon gradual cold exposure
Publication date: Available online 23 August 2018Source: Journal of Thermal BiologyAuthor(s): Kasiphak Kaikaew, Johanna C. van den Beukel, Sebastian J.C.M.M. Neggers, Axel P.N. Themmen, Jenny A. Visser, Aldo GrefhorstAbstractTo maintain a thermal balance when experiencing cold, humans reduce heat loss and enhance heat production. A potent and rapid mechanism for heat generation is shivering. Research has shown that women prefer a warmer environment and feel less comfortable than men in the same thermal condition. Using the Blanketrol® III, a temperature management device commonly used to study brown adipose tissue acti...
Source: Journal of Thermal Biology - August 24, 2018 Category: Biology Source Type: research

Effects of pre-exercise sucrose ingestion on thermoregulatory responses to near-maximal 5-km running
Publication date: October 2018Source: Journal of Thermal Biology, Volume 77Author(s): Patrick B. WilsonAbstractResearch has shown that carbohydrate consumption can increase body temperature at rest and, in some cases, during exercise. Most exercise studies, however, haven’t matched exercise intensity between carbohydrate and placebo conditions. The purpose of this randomized, double-blind, placebo-controlled trial was to examine whether pre-exercise carbohydrate consumption independently accelerates the usual temperature rise with intense exercise. Twenty-eight runners self-reported 5-km performance (16–23 mi...
Source: Journal of Thermal Biology - August 24, 2018 Category: Biology Source Type: research

Editorial Board
Publication date: August 2018Source: Journal of Thermal Biology, Volume 76Author(s): (Source: Journal of Thermal Biology)
Source: Journal of Thermal Biology - August 23, 2018 Category: Biology Source Type: research

Annotation of differential protein expression in the hypothalami of layer-type Taiwan country chickens in response to acute heat stress
In conclusion, acute heat stress induces differential protein expression in the hypothalami of the L2 strain Taiwan country chickens, which may manifest detrimental effects. Furthermore, differential expression is a critical response in the hypothalamus for the regulation of thermotolerance. (Source: Journal of Thermal Biology)
Source: Journal of Thermal Biology - August 23, 2018 Category: Biology Source Type: research

Heat stress in poultry production; Mitigation strategies to overcome the future challenges facing the global poultry industry
Publication date: Available online 22 August 2018Source: Journal of Thermal BiologyAuthor(s): Aamir Nawab, Fahar Ibtisham, Guanghui Li, Barbara Kieser, Jiang Wu, Wenchao Liu, Yi Zhao, Yasir Nawab, Kongquan Li, Mei Xiao, Lilong AnAbstractWorldwide, the effect of climatic variations has become a great challenge in poultry production. As global climate is changing, it alters the environmental temperatures, precipitation patterns and atmospheric carbon dioxide. Poultry farming mainly depends on climatic conditions such as temperature and humidity. Several factors can be involved but heat stress is one of most important environ...
Source: Journal of Thermal Biology - August 23, 2018 Category: Biology Source Type: research

Effects of the daily heat load duration exceeding determined heat load thresholds on activity traits of lactating dairy cows
The objective of the present study was to determine heat load thresholds of average daily temperature-humidity index (THI) that lead to changes in different activity traits of lactating high-yielding dairy cows. Furthermore, we studied how the activity of the cows to heat load was influenced by the daily heat load duration which exceeded the heat load we had determined as threshold in our experiments. The study was conducted from June 2015 to May 2017 in a naturally ventilated dairy barn in Groß Kreutz, Germany. The climate was measured at several positions inside the barn, and the average THI was calculated every 10...
Source: Journal of Thermal Biology - August 21, 2018 Category: Biology Source Type: research

Central cholinergic activation induces greater thermoregulatory and cardiovascular responses in spontaneously hypertensive than in normotensive rats
Publication date: Available online 20 August 2018Source: Journal of Thermal BiologyAuthor(s): Sueli Ferreira da Fonseca, Vanessa Amaral Mendonça, Sara Barros Silva, Talita Emanuela Domingues, Dirceu Sousa Melo, Jeanne Brenda Martins, Washington Pires, Cynthia Ferreira Fernandes Santos, Wagner de Fátima Pereira, Laura Hora Rios Leite, Cândido Celso Coimbra, Hércules Ribeiro Leite, Ana Cristina Rodrigues LacerdaAbstractThere is evidence that central cholinergic stimulation increases heat dissipation in normotensive rats besides causing changes on the cardiovascular system via modulation of barorece...
Source: Journal of Thermal Biology - August 21, 2018 Category: Biology Source Type: research

Small Interfering RNA based knock down of acute heat shock and or GGA inducible bovine heat shock protein 70 may interfere invitro expression pattern of TLR2/4 and NOD1/2
This study may add some references pertaining to the innate immune modulatory effects of bovine heat shock protein 70. (Source: Journal of Thermal Biology)
Source: Journal of Thermal Biology - August 21, 2018 Category: Biology Source Type: research

Dietary nano-silver: Does support or discourage thermal tolerance and biochemical status in air-breathing fish reared under multiple stressors?
Publication date: Available online 20 August 2018Source: Journal of Thermal BiologyAuthor(s): Neeraj Kumar, K K Krishnani, Paritosh Kumar, Rupam Sharma, Raju Baitha, Dilip Kumar Singh, Narendra Pratap SinghAbstractUnexpected fluctuations in weather parameters due to global climate change have been observed in all ecosystems worldwide. The aquatic ecosystem shelters a great diversity of fishes in the upper region of the ecosystem which adversely get affected due to their poikilothermic nature. The present study was designed t to elucidate the impact of critical temperature minima (CTMin), lethal temperature minima (LTMin), ...
Source: Journal of Thermal Biology - August 21, 2018 Category: Biology Source Type: research

Effect of the trabecular bone microstructure on measuring its thermal conductivity: a computer modeling-based study
The objective of this work is to quantify the relation between the value of the effective thermal conductivity of trabecular bone and its microstructure and marrow content. The thermal conductivity of twenty bovine trabecular bone samples was measured prior to and after defatting at 37, 47, and 57 °C. Computer models were built including the microstructure geometry and the gap between the tissue and measurement probe. The thermal conductivity (k) measured was 0.39 ± 0.06 Wm-1K-1 at 37 °C, with a temperature dependence of +0.2%°C-1. Replacing marrow by phosphate-buffered saline (defatting) incre...
Source: Journal of Thermal Biology - August 20, 2018 Category: Biology Source Type: research

Chronic heat stress increases insulin-like growth factor-1(IGF-1) but does not affect IGF-binding proteins in growing pigs
This study aimed to investigate the alterations of IGF-1 and IGFBPs under chronic HS in growing pigs. Twenty-seven growing large white barrows with similar body weight were collected from nine litters and were assigned into three treatments. The litter effect is balanced in all treatments. Treatments were: 1) thermal-neutral (TN) group (23 °C), 2) chronic HS group (33 °C), and 3) pair-fed in TN condition (PFTN). The experiment lasted for 21 days. Compared with TN controls, decreased FI, lower average body weight gain, higher rectal temperature and increased respiration rates were observed in HS pigs. On D...
Source: Journal of Thermal Biology - August 19, 2018 Category: Biology Source Type: research

An Altered Bioheat Model for Persons with Cervical Spinal Cord Injury
The objective of this work is to develop a Bioheat model to predict the thermal responses of people with tetraplegia (TP) under hot, cold and neutral ambient conditions as well as different physical activities suitable for their level of injury. The focus is on TP with impairment or loss of motor and/or sensory function in C1 to C7 segments of the spinal cord due to damage of neural elements within the spinal canal. Starting from transient multi-segmented Bioheat model of able-bodied (AB) people, specific modifications were performed reflecting the changes in physiology due to the injury affecting the blood circulation sys...
Source: Journal of Thermal Biology - August 19, 2018 Category: Biology Source Type: research

Effects of pre-exercise sucrose ingestion on thermoregulatory responses to near-maximal 5-kilometer running
Publication date: Available online 17 August 2018Source: Journal of Thermal BiologyAuthor(s): Patrick B. WilsonAbstractResearch has shown that carbohydrate consumption can increase body temperature at rest and, in some cases, during exercise. Most exercise studies, however, haven’t matched exercise intensity between carbohydrate and placebo conditions. The purpose of this randomized, double-blind, placebo-controlled trial was to examine whether pre-exercise carbohydrate consumption independently accelerates the usual temperature rise with intense exercise. Twenty-eight runners self-reported 5-km performance (16&ndash...
Source: Journal of Thermal Biology - August 17, 2018 Category: Biology Source Type: research

EPR Hyperthermia of S. cerevisiae using Superparamagnetic Fe3O4 Nanoparticles
We report the growth dynamics of the S. cerevisiae yeast cells exposed to EPR heating with superparamagnetic magnetite (Fe3O4) nanoparticles, with only 4% of yeast cells surviving hyperthermia. Given that EPR functions independently of type of the biologic species exposed, and produces spatially localized heating in conjunction with MRI hardware, it may be used in hyperthermia therapy of cancer and other diseases.Graphical abstract (Source: Journal of Thermal Biology)
Source: Journal of Thermal Biology - August 10, 2018 Category: Biology Source Type: research

A review and quantitative assessment of cattle-related thermal indices
Publication date: Available online 9 August 2018Source: Journal of Thermal BiologyAuthor(s): Xiaoshuai Wang, Bjarne Schmidt Bjerg, Christopher Y. Choi, Chao Zong, Guoqiang ZhangAbstractMany thermal indices have been developed to assess the levels of heat stress imposed on cattle during hot weather. In this paper, the 16 cattle-related thermal indices are critically reviewed. The primary emphasis is to evaluate each index's coherence to the typical heat transfer characteristics of a cow. Other perspectives including incorporated environmental parameters in the equation(s), experimental data, correlated physiological respons...
Source: Journal of Thermal Biology - August 9, 2018 Category: Biology Source Type: research

Variation of preferred body temperatures along an altitudinal gradient: a multi-species study
Publication date: Available online 8 August 2018Source: Journal of Thermal BiologyAuthor(s): Trochet Audrey, Dupoué Andréaz, Souchet Jérémie, Bertrand Romain, Deluen Marine, Murarasu Sophie, Calvez Olivier, Martinez-Silvestre Albert, Verdaguer-Foz Isabel, Darnet Elodie, Le Chevalier Hugo, Mossoll-Torres Marc, Guillaume Olivier, Aubret FabienAbstractTemperature affects the physiological functions of ectotherms. To maintain optimal body temperature and ensure physiological performance, these organisms can use behavioral adjustments to keep the body temperature in their specific temperature range, ...
Source: Journal of Thermal Biology - August 8, 2018 Category: Biology Source Type: research

High oxidative stress despite low energy metabolism and vice versa: insights through temperature acclimation in an ectotherm
Publication date: Available online 7 August 2018Source: Journal of Thermal BiologyAuthor(s): Stanisław Bury, Mariusz Cichoń, Ulf Bauchinger, Edyta T. SadowskaAbstractReactive oxygen species (ROS) are inescapable byproducts of energy metabolism and may cause costly damage to biomolecules. Organisms have evolved different means to counter oxidative stress, such as modulation of ROS production, neutralization of produced ROS through free radical scavenging and the repair or removal of the damaged structures. A positive relationship between metabolic rate and ROS production is commonly expected, but the oxidative burden of a...
Source: Journal of Thermal Biology - August 8, 2018 Category: Biology Source Type: research

Numerical investigation of the effect of vessel size and distance on the cryosurgery of an adjacent tumor
Publication date: Available online 7 August 2018Source: Journal of Thermal BiologyAuthor(s): Malikeh Nabae, Mehrdad KarimiAbstractCryosurgery is an efficient cancer treatment which can be used for non-invasive ablation of some internal tumors such as liver and prostate. Tumors are usually located near the large blood vessels and the heat convection may affect the progression of the ice ball. Hence it is necessary to predict the surgery procedure and its consequences earlier. In spite of the recent studies it is still unclear that which arteries will significantly affect the freezing treatment of tumors and which can be ign...
Source: Journal of Thermal Biology - August 8, 2018 Category: Biology Source Type: research

Screening of cold tolerance in fifteen springtail species
Publication date: Available online 30 July 2018Source: Journal of Thermal BiologyAuthor(s): Martin HolmstrupAbstractSpringtails (Collembola) are ubiquitous and help ecosystem processes such as the decomposition of dead plant material. Their ability to survive low winter temperatures is an important trait that partly defines their geographic distribution. The cold tolerances of 15 laboratory-reared species of springtails were investigated. Springtails were cold acclimated in the laboratory over two months in order to simulate a seasonal change in temperature during autumn. Springtails were then exposed to decreasing sub-zer...
Source: Journal of Thermal Biology - July 31, 2018 Category: Biology Source Type: research

Seed germination of a South American forest tree described by linear thermal time models
Publication date: Available online 27 July 2018Source: Journal of Thermal BiologyAuthor(s): L. Felipe Daibes, Victor J.M. CardosoAbstractThermal time models may describe and compare seed germination, providing information useful to explain species distribution. However, the capacity of such threshold models to describe germination of tropical native species has been less studied. We evaluated seed germination of a legume tree species (Peltophorum dubium), typical from South American seasonal forests, as described by two linear thermal time models: probit model and graphic model. Seeds were provided from four different prov...
Source: Journal of Thermal Biology - July 28, 2018 Category: Biology Source Type: research

Seasonal variation of energy expenditure in Japanese macaques (Macaca fuscata)
Publication date: Available online 25 July 2018Source: Journal of Thermal BiologyAuthor(s): John Chih Mun Sha, Yosuke Kurihara, Yamato Tsuji, Makiko Take, Tianmeng He, Akihisa Kaneko, Naoko Suda-Hashimoto, Mayumi Morimoto, Takayoshi Natsume, Alexandre Zahariev, Stéphane Blanc, Goro HanyaAbstractAnimals living in seasonal environments must adapt to a wide variation of temperature changes which requires flexible adjustments of time budget and metabolic processes for efficient thermoregulation. The Japanese macaque (Macaca fuscata) is one of only a handful of nonhuman primate species that experience seasonal climates o...
Source: Journal of Thermal Biology - July 25, 2018 Category: Biology Source Type: research

A Predictive Model of Equivalent Temperature Index for Dairy Cattle (ETIC)
The objective of this study was to develop a thermal index for dairy cattle, referred to as Equivalent Temperature Index for Cattle (ETIC), which incorporates air temperature, relative humidity, air velocity and solar radiation and their interactions. Environmental and physiological data from two studies were pooled together to develop and validate the proposed index. The index (ETIC) expressed in terms of temperature units is derived from equivalent air temperature of relative humidity, air velocity and solar radiation. ETIC heat-stress level thresholds were defined according to the thresholds for temperature-humidity ind...
Source: Journal of Thermal Biology - July 24, 2018 Category: Biology Source Type: research

Effect of selenomethionine on cell viability and heat shock protein 70 levels in rainbow trout intestinal epithelial cells at hypo-, normo-, and hyper-thermic temperatures
Publication date: Available online 23 July 2018Source: Journal of Thermal BiologyAuthor(s): John J. Kim, Phuc H. Pham, Mark E. Hamilton, Lucy E.J. Lee, Niels C. BolsAbstractAs global warming and environmental pollution modify aquatic environments, the thermal biology of fish could be affected by interactions between temperature and pollutants, such as selenium (Se). Therefore, selenomethionine (SeMet) was studied for effects on cell viability and on heat shock protein 70 (HSP70) levels in the rainbow trout intestinal epithelial cell, RTgutGC, at hypothermic (4 °C), normothermic (14 and 18 °C) and hyperthe...
Source: Journal of Thermal Biology - July 24, 2018 Category: Biology Source Type: research

Low quality diet and challenging temperatures affect vital rates, but not thermal tolerance in a tropical insect expanding its diet to an exotic plant
This study focuses on Cephaloleia belti (Coleoptera: Chrysomelidae), a tropical insect currently expanding its diet to an exotic host plant. We determined how high and low-quality diets (i.e., native vs novel host), as well as exposure temperatures affect CTmax of adult beetles. We also estimated larval and adult survival when feeding on high and low quality host plants, when exposed to temperatures typical of the elevational distribution of this species, or when exposed to projected temperatures in 100 years. We did not detect an effect of diet quality or acclimation on CTmax. However, larvae and adults had different ther...
Source: Journal of Thermal Biology - July 24, 2018 Category: Biology Source Type: research

HIGHER ENVIRONMENTAL TEMPERATURES PROMOTE ACCELERATION OF SPERMATOGENESIS IN VIVO IN MICE (Mus musculus)
Publication date: Available online 23 July 2018Source: Journal of Thermal BiologyAuthor(s): Guilherme M.J. Costa, Samyra M.S.N. Lacerda, André F.A. Figueiredo, Marcelo C. Leal, José V. Rezende-Neto, Luiz R. FrançaAbstractTemperature is considered a crucial modulator of reproductive activity and testis homeostasis. It is well known that elevated temperatures cause several effects on testicular components, particularly on germ cells, which might lead to the impairment of spermatogenesis and loss of male fertility. The present study aimed to evaluate the effects of different environmental temperatures on ...
Source: Journal of Thermal Biology - July 24, 2018 Category: Biology Source Type: research

Effects of heat stress on the liver of the Chinese giant salamander Andrias davidianus: histopathological changes and expression characterization of Nrf2-mediated antioxidant pathway genes
In this study, Nrf2 was first identified and characterized in the Chinese giant salamander (Andrias davidianus). A. davidianus was exposed to a high ambient temperature of 30 °C for various periods of time (0, 3, 6, 12, 24, 48 and 72 h). We investigated the effects of heat stress on alterations of the hepatic malondialdehyde (MDA) concentration, the activities of lactic acid dehydrogenase (LDH), catalase (CAT), glutathione peroxidase (GPx) and superoxide dismutase (SOD), the histology of the liver, and the mRNA expression patterns of 11 genes involved in the Nrf2-mediated antioxidant pathway in A. davidianus. The resul...
Source: Journal of Thermal Biology - July 24, 2018 Category: Biology Source Type: research

Plastic responses to diel thermal variation in juvenile green sturgeon, Acipenser medirostris
We examined the capacity of juvenile green sturgeon (Acipenser medirostris) to respond to daily thermal variation. Juveniles (47 days post-hatch) were exposed to either stable (15 ± 0.5 °C) or variable (narrowly variable: 13–17 °C day-1 or widely variable 11–21 °C day-1) thermoperiod treatments, with equivalent mean temperatures (15 ± 0.5 °C), for 21 days. Growth (relative growth rate, % body mass gain), upper thermal tolerance (critical thermal maxima, CTMax) and the thermal sensitivity of swimming performance (critical swimming speed, Ucrit) were ass...
Source: Journal of Thermal Biology - July 24, 2018 Category: Biology Source Type: research

Photonic structures improve radiative heat exchange of Rosalia alpina (Coleoptera: Cerambycidae)
Publication date: Available online 23 July 2018Source: Journal of Thermal BiologyAuthor(s): Danica Pavlović, Darko Vasiljević, Branislav Salatić, Vladimir Lazović, Goran Dikić, Ljubiša Tomić, Srećko Ćurčić, Petar Milovanović, Dajana Todorović, Dejan V. PantelićAbstractThe insect cuticle serves a multitude of purposes, including: mechanical and thermal protection, water-repelling, acoustic signal absorption and coloration. The influence of cuticular structures on infrared radiation exchange and thermal balance is still largely unexplored. Here we report on the micro- and nanostructured setae covering the...
Source: Journal of Thermal Biology - July 24, 2018 Category: Biology Source Type: research

Physiological alterations of poultry to the high environmental temperature
This article focuses on the scientific evidence available on the negative role of heat stress on physiological responses, biochemical blood parameters, immunity, antioxidant, mineral balance, acid-base balance, osmoregulation, body and rectal temperature, intestinal and ileal microbiota as well as the parameters related to thyroid, liver and kidney functions in some poultry species. (Source: Journal of Thermal Biology)
Source: Journal of Thermal Biology - July 24, 2018 Category: Biology Source Type: research

Infrared thermography provides insight into the thermal properties of bird nests
This study investigated the insulative properties of nests of the Eurasian Bullfinch (Pyrrhula pyrrhula), the Common Blackbird (Turdus merula) and the Song Thrush (Turdus philomelos) using IR thermography. Nests were inverted over a heat source and the temperature of the external nest surface was recorded. Bullfinch nests were less insulated than thrush nests. Including foil inside the nest cup decreased the amount of convection through the open walls of Bullfinch nests. Removal of the outer nest and cup lining of thrush nests only slightly decreased the degree of insulation offered by the nest indicating an important insu...
Source: Journal of Thermal Biology - July 20, 2018 Category: Biology Source Type: research

The effect of water temperature on muscle cellularity and gill tissue of larval and juvenile Lophiosilurus alexandri, a Neotropical freshwater fish
Publication date: Available online 11 July 2018Source: Journal of Thermal BiologyAuthor(s): Rodrigo Takata, Cíntia Labussière Nakayama, Walisson de Souza e Silva, Nilo Bazzoli, Ronald Kennedy LuzAbstractThe effect of temperature on muscle development and gill tissue were investigated in larval and juvenile Lophiosilurus alexandri, a carnivorous Neotropical fish species. Larvae and juveniles were reared at temperatures of 23, 26, 29 and 32 °C for 15 and 35 days, respectively. The larvae were fed Artemia nauplii, while the juveniles received a formulated diet. In both stages, high temperatures resulted...
Source: Journal of Thermal Biology - July 12, 2018 Category: Biology Source Type: research

Interactions between perceived exertion and thermal perception in the heat in endurance athletes
Publication date: Available online 11 July 2018Source: Journal of Thermal BiologyAuthor(s): Gilles Roussey, Mathieu Gruet, Fabrice Vercruyssen, Julien Louis, Jean-Marc Vallier, Thierry BernardAbstractIntroductionThe study aimed to investigate how a distortion of perceived exertion in the heat may affect, during a self-paced cycling exercise preceded by prior cognitive task, the thermal perception and the subsequent regulation of power output in high level athletes.MethodsEleven endurance trained male athletes completed four experimental sessions including a 30-min fixed-RPE (15-Hard) cycling exercise in neutral (TMP-22 &de...
Source: Journal of Thermal Biology - July 12, 2018 Category: Biology Source Type: research