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Journal of Thermal Biology

Diego Miguel Arenas-Moreno, Rufino Santos-Bibiano, Francisco Javier Muñoz-Nolasco, Pierre Charruau, Fausto Roberto Méndez-de la Cruz
Activity patterns in ectotherms rely on the structure of the thermal environment and thermoregulatory opportunities during activity periods. A dichotomy between diurnal and nocturnal ectotherms is not clear in every case, and temperature can directly affect the daily activity period in these organisms during both photophase and scotophase. In the present study we evaluate the thermal ecology of six tropical night lizards (genus Lepidophyma) from Mexico. Our results indicate a thermoconformer strategy in most of the studied species...
July 2018: Journal of Thermal Biology
Karin Brydsø Dammark, Anne-Laure Ferchaud, Michael M Hansen, Jesper G Sørensen
Ectothermic animals like fishes are extremely dependent on temperature, as they are not able to change body temperature physiologically. When populations are found in isolated water bodies such as small lakes they will have to respond to stressful high temperatures by behavioral avoidance, phenotypic plasticity or microevolutionary change. We analyzed threespine sticklebacks from two large and two small lakes, representing different isolated populations. We determined maximum critical thermal limits (CTmax) and the associated gene expression responses in three heat shock (hsp60, hsp70, hsp90) and two key metabolic (idh2, fbp2) genes at ecologically relevant moderate heat stress (26 °C) as well as at the critical thermal limit (CTmax)...
July 2018: Journal of Thermal Biology
Juliana de Souza Terra, Zaida Ortega, Vanda Lúcia Ferreira
Temperature is one of the main environmental variables shaping the evolution and biology of terrestrial ectotherms. The Pantanal is the largest continuous wetland in the World. However, a lack of knowlegde still exists on the thermal ecology of terrestrial ectothems from this wetland. In this context, the thermal ecology of the lizard Tropidurus lagunablanca Carvalho, 2016 (Squamata, Tropiduridae) was investigated in the Brazilian Pantanal. The thermal ecology and microhabitat use of lizards from a riparian forest was compared to lizards from a park savanna...
July 2018: Journal of Thermal Biology
Ulises Macías-Cruz, Jazmín C Stevens, Abelardo Correa-Calderón, Miguel Mellado, Cesar A Meza-Herrera, Leonel Avendaño-Reyes
Nutritional requirements of sheep during late gestation increase as a consequence of high fetal growth, mammary tissue development and colostrum synthesis. While prepartum energy supplementation is a nutritional strategy to improve lamb postnatal performance in thermoneutral environments, this has not been studied under heat stress. This study aimed to evaluate effects of maternal energy supplementation during the last third of pregnancy on post-weaning feedlot performance and thermoregulation capacity of heat-stressed male lambs born from multiple births...
July 2018: Journal of Thermal Biology
Sajjad Farashi, Pezhman Sasanpour, Hashem Rafii-Tabar
The effect of temperature variations on the pancreatic β-cell activity and the role of different model compartments in temperature sensing have been investigated using a computational modeling approach. The results of our study show that temperature variations by several degrees can change the dynamical states of the β-cell system. In addition, temperature variations can alter the characteristic features of the membrane voltage, which correlates with insulin secretion. Simulation results show that the ion channels such as the L-type calcium, the hERG potassium, sodium channels and the glycolysis pathway are the possible sites for sensing temperature variation...
July 2018: Journal of Thermal Biology
Maria Clemente, Giuseppe Fusco, Lorenzo Tonina, Folco Giomi
Drosophila suzukii (Matsumura, 1931) is a highly successful invasive dipteran which represents a serious threat for global fruit industry. Among other adaptive traits, D. suzukii owes its success to the derived morphological features of its ovipositor, which allows the insect to exploit the exclusive ecological niche of fresh fruit, thus avoiding competition with other closely related species. With the aim of investigating temperature-induced phenotypic plasticity of D. suzukii ovipositor, we reared this insect in four different laboratory conditions, represented by the combination of two developmental temperatures and two diet regimes for the larvae...
July 2018: Journal of Thermal Biology
Michelle E Thompson, Brian J Halstead, Maureen A Donnelly
Regeneration of secondary forests on previously deforested or degraded land is one of the most dominant forms of land-use change in the tropics. However, the response of animal communities to forest regeneration is poorly understood. To evaluate support for thermal quality as a mechanism driving reptile species distributions during secondary forest succession, we measured operative temperatures and occupancy in three successional forest stages (pasture, secondary forest, and old growth forest) for two anole species common in the landscape (Norops humilis and Norops limifrons)...
July 2018: Journal of Thermal Biology
Wade K Stanton-Jones, Shivan Parusnath, Graham J Alexander
Body temperature (Tb ) is one of the most influential factors affecting physiological processes in ectothermic animals. Reptiles use behaviours such as shuttling, and postural and orientation adjustments to ensure that Tb remains close to a target. It is thought that target body temperature (Ttarget ) is aligned to the physiological and behavioural thermal optima of the animal. The Sungazer (Smaug giganteus), a Threatened lizard species, is unique amongst the Cordylidae in that lizards inhabit self-excavated burrows in open grasslands, a habitat in which there are few exposed rock basking sites...
July 2018: Journal of Thermal Biology
Jacques J Frigault, Josée D Gaudet, Pier Jr Morin
Small mammals hibernate to deal with environmental conditions associated with the winter season. Numerous physiological changes occur during a typical torpor-arousal cycle including variations in heart rate and blood flow. Such cycle possesses characteristics of ischemia-reperfusion cycles that can lead to oxidative stress in non-hibernating models. Interestingly, hibernators can cope with these conditions and the complete molecular picture underlying this adaptation is not fully understood. Non-coding RNAs, including microRNAs (miRNAs) and long non-coding RNAs (lncRNAs), can impact expression and activity of various targets and have been associated with oxidative stress response...
July 2018: Journal of Thermal Biology
Maryam Semsar-Kazerouni, Wilco C E P Verberk
Temperature has a profound impact on ectotherms. Warming increases the metabolic oxygen demand of ectotherms, which could result in a mismatch between their oxygen demand and their ability to extract and deliver sufficient oxygen to meet demand. This hypothesis has been mainly tested using short-term exposure to intense thermal stress. However, the thermal responses of organisms can be different on longer timescales, where physiological acclimation becomes increasingly important. Such thermal acclimation effects may reduce the vulnerability of ectotherms to warming on the long term...
July 2018: Journal of Thermal Biology
Ayda Bozorgchenani, Jafar Seyfabadi, Mohammad Reza Shokri
Effects of thermal discharge from Neka power plant on macrobenthic diversity and abundance was studied in the southern coast of the Caspian Sea. Samples were collected with Van Veen grab of 0.0250 m2 surface area from 7 stations in winter and summer. A total of 42 species were identified that belonged to 22 genera, 18 families, 13 orders, six classes and three phyla. Bivalve with a total abundance of 90% in winter and 86% in summer constituted the most abundant group throughout samplings, the highest abundance of which belonged to the family Cardiidae...
July 2018: Journal of Thermal Biology
Suellen Pereira Espíndola, Lenka Bobuľská, Adão de Siqueira Ferreira
Soil microbial respiration (SMR1 ) is a major flux of CO2 from terrestrial ecosystems into the atmosphere, which depends on several abiotic factors, including soil temperature and nutrient availability. A nutrient of great interest in soil ecology is nitrogen (N) because of its use in agriculture and an expected increase of depositions in soils. Models on the relationship between SMR and temperature may be able to describe the effects of N addition on the temperature sensitivity of soil respiration (Q10 2 )...
July 2018: Journal of Thermal Biology
Martin Weigert, Nico Nitzsche, Felix Kunert, Christiane Lösch, Henry Schulz
Resistance exercise leads to an increase in skin temperature (Tskin ) in the area of the exercised muscle. Infrared thermography seems to be applicable to identify these primary used functional muscles with measuring Tskin changes. The aim of the current study was to investigate the influence of body composition on Tskin patterns after resistance exercise. 38 male subjects (19-32 years, BMI 20.4-55.2 kg/m2 ) participated. Body fat percentage and biceps skinfold thickness were calculated. The subjects were divided into two groups: lean group (LG) with body fat percentage < 25%, obese group (OG) with body fat percentage ≥ 25%...
July 2018: Journal of Thermal Biology
Yefei Cheng, Mingfang Du, Qiao Xu, Yueping Chen, Chao Wen, Yanmin Zhou
This study investigated the effects of dietary mannan oligosaccharide (MOS) supplementation on growth performance, serum corticosterone level, and antioxidant ability, meat quality as well as chemical composition of breast muscle in broilers exposed to cyclic heat stress (HS). 144 one-day-old male broiler chicks (Arbor Acres plus) were randomly allocated to 3 treatments with 6 replicates each. Broilers in the control and HS groups were fed a basal diet, and in the MOS group were given the basal diet supplemented with 1 g/kg MOS for 42 days, respectively...
July 2018: Journal of Thermal Biology
Olivier Bonato, Joel Chadoeuf
In poikilotherms, developmental time and adult lifespan are biological traits driven by temperature although their underlying physiological mechanisms differ. The developmental theory of ageing predicts a positive correlation between these two traits without confirming a genetic or causal relationship. The developmental rate isomorphy hypothesis established that the proportionality in the duration of each pre-imaginal stage with respect to total developmental time does not vary with temperature. This may have important evolutionary implications...
July 2018: Journal of Thermal Biology
Carmen Rolandi, Pablo E Schilman
Environmental temperature is an abiotic factor with great influence on biological processes of living beings. Jensen's inequality states that for non-lineal processes, such as most biological phenomena, the effects of thermal fluctuations cannot be predicted from mean constant temperatures. We studied the effect of daily temperature fluctuation (DTF) on Rhodnius prolixus, a model organism in insect physiology, and an important vector of Chagas disease. We measured development time from egg to adult, fecundity, fertility, body mass reduction rate (indirect measurement of nutrient consumption rates) and survival after a single blood meal...
May 2018: Journal of Thermal Biology
Belén Gallego, José R Verdú, Jorge M Lobo
Insects can use thermoregulation to keep their body temperatures within a certain range in response to thermal stress situations. The mechanisms to regulate internal temperature depend on whether species are endothermic or ectothermic species, i.e., if the heat source is internal and/or external. In this study, the thermal stress response due to excess heat was examined in individuals belonging to different species of the Geotrupinae subfamily by using a standardized protocol based on infrared thermography...
May 2018: Journal of Thermal Biology
Rodolfo César de Oliveira Anderson, Rafael Parelli Bovo, Denis Vieira Andrade
As ectotherms, amphibians may exhibit changes in their thermal biology associated with spatial and temporal environmental contingencies. However, our knowledge on how amphibian´s thermal biology responds to seasonal changes in the environment is restricted to a few species, mostly from temperate regions, in a marked contrast with the high species diversity found in the Neotropics. We investigated whether or not the seasonal variation in climatic parameters from a high-montane ombrophilous forest in the Brazilian Atlantic Forest could lead to concurrent adjustments in the thermal biology of the terrestrial toad Rhinella icterica...
May 2018: Journal of Thermal Biology
Andrew N Rouble, Liam J Hawkins, Kenneth B Storey
The thirteen-lined ground squirrel (Ictidomys tridecemlineatus) is a well-known model for studying hibernation. While in a torpid state, these animals globally suppress energy expensive processes, while supporting specialized pathways necessary for survival. Lysine acetyltransferases (KATs) play a crucial role in modulating the expression and activity of a wide-variety of cellular pathways and processes, and therefore, may play a role during hibernation when the cell is shifting to an energy conservative, cytoprotective state...
May 2018: Journal of Thermal Biology
Melissa Skein, Georgia Wingfield, Rachel Gale, Tracy L Washington, Geoffrey M Minett
Exercise in the heat is a common occurrence among athletes and often is intentional in order to gain heat acclimation benefits, however, little is known about how such training may affect sleep. Therefore, this study investigated five days of training in the heat of varying intensity and duration and inclusion of cold-water immersion (CWI) recovery on sleep quantity and quality. Thirty recreationally-trained male participants completed five days of heat training (HT) and were randomised into three interventions including (i) 90 min cycling at 40% power at maximal aerobic capacity (Pmax ) with 15 min passive recovery (90HT); (ii) 90 min cycling at 40% Pmax with 15 min CWI recovery (90CWI); or (iii) 30 min cycling alternating between 40% and 70% Pmax , with 15 min passive recovery (30HT)...
May 2018: Journal of Thermal Biology
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