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Journal articles on the topic 'Thermal place preference'
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1
Balayssac, David, Bing Ling, Jérémy Ferrier, Bruno Pereira, Alain Eschalier, and Nicolas Authier. "Assessment of thermal sensitivity in rats using the thermal place preference test." Behavioural Pharmacology 25, no. 2 (April 2014): 99–111. http://dx.doi.org/10.1097/fbp.0000000000000026.
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Caporoso, Joel, Mark Moses, Kerryann Koper, Tommy S. Tillman, Lingling Jiang, Nicole Brandon, Qiang Chen, Pei Tang, and Yan Xu. "A Thermal Place Preference Test for Discovery of Neuropathic Pain Drugs." ACS Chemical Neuroscience 11, no. 7 (March 19, 2020): 1006–12. http://dx.doi.org/10.1021/acschemneuro.0c00013.
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Mulliner, Emma, Mike Riley, and Vida Maliene. "Older People’s Preferences for Housing and Environment Characteristics." Sustainability 12, no. 14 (July 16, 2020): 5723. http://dx.doi.org/10.3390/su12145723.
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Population ageing presents significant challenges for many countries, one of which is the provision of adequate housing. Developing understanding of the needs and preferences of ageing societies will be crucial in order to assist in the provision of suitable housing and communities that are sustainable in the long term. While a preference to ‘age in place’ is clear in the literature, comparatively less academic research is available on older people’s preferences for more specific housing and environment attributes. The aim of this study is to identify the main housing and environment characteristics that are linked to the health and wellbeing of the elderly and determine the preferences for such characteristics via a survey with UK residents aged 55+. The results indicate a strong preference for independent living and an increasing desire for bungalows in later life. Housing conditions, energy efficiency, thermal comfort, and home adaptions to facilitate ageing in place are particularly important housing characteristics to older people. The location and environment are also key drivers of housing preferences; a safe neighbourhood, accessibility to amenities, public transport, and a clean and walkable environment are particularly important. Preferences varied with age, but gender has a less significant impact on the preferences expressed. The findings of this study will be valuable for stakeholders engaged in housing policy and provision for older people.
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Khalilzadeh, Emad, Gholamreza Vafaie Sayah, Hatef Khosravi, Mahdi Dolatyari, Farzin Azarpey, and Reza Hazrati. "Evaluation of Cold allodynia by Thermal Place Preference Test Following A Short Term of Treadmill Exercise in Neuropathic Rats." journal of ilam university of medical sciences 26, no. 2 (June 1, 2018): 155–71. http://dx.doi.org/10.29252/sjimu.26.2.155.
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Kraft, Vanessa, Katja Schmitz, Annett Wilken-Schmitz, Gerd Geisslinger, Marco Sisignano, and Irmgard Tegeder. "Trehalose Reduces Nerve Injury Induced Nociception in Mice but Negatively Affects Alertness." Nutrients 13, no. 9 (August 25, 2021): 2953. http://dx.doi.org/10.3390/nu13092953.
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Trehalose, a sugar from fungi, mimics starvation due to a block of glucose transport and induces Transcription Factor EB- mediated autophagy, likely supported by the upregulation of progranulin. The pro-autophagy effects help to remove pathological proteins and thereby prevent neurodegenerative diseases such as Alzheimer’s disease. Enhancing autophagy also contributes to the resolution of neuropathic pain in mice. Therefore, we here assessed the effects of continuous trehalose administration via drinking water using the mouse Spared Nerve Injury model of neuropathic pain. Trehalose had no effect on drinking, feeding, voluntary wheel running, motor coordination, locomotion, and open field, elevated plus maze, and Barnes Maze behavior, showing that it was well tolerated. However, trehalose reduced nerve injury-evoked nociceptive mechanical and thermal hypersensitivity as compared to vehicle. Trehalose had no effect on calcium currents in primary somatosensory neurons, pointing to central mechanisms of the antinociceptive effects. In IntelliCages, trehalose-treated mice showed reduced activity, in particular, a low frequency of nosepokes, which was associated with a reduced proportion of correct trials and flat learning curves in place preference learning tasks. Mice failed to switch corner preferences and stuck to spontaneously preferred corners. The behavior in IntelliCages is suggestive of sedative effects as a “side effect” of a continuous protracted trehalose treatment, leading to impairment of learning flexibility. Hence, trehalose diet supplements might reduce chronic pain but likely at the expense of alertness.
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Shooshtarian and Rajagopalan. "Perception of Wind in Open Spaces." Climate 7, no. 9 (September 2, 2019): 106. http://dx.doi.org/10.3390/cli7090106.
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Dense urbanization influences the livability of cities. Changes in local meteorological conditions can be adverse for human health and well-being. In urban open spaces, it is widely known that changes in building density and configuration in cities influence wind speed (Va). This influence modifies latent heat flux between the human body and surrounding environment and thereby affecting the thermal comfort conditions in open spaces between buildings. Several studies have demonstrated the significant effect of wind speed on outdoor thermal comfort. Melbourne’s Central Business District (CBD) has recently experienced dense urbanization and this pattern of development has instigated noticeable changes in meteorological conditions. Some evidence has suggested that the patterns of wind flow induce thermal discomfort during cool seasons. Conversely, the wind is most welcomed during warm seasons. This study was conducted to assess outdoor users’ responses to Va in three open spaces of an educational precinct in Melbourne’s CBD. The open spaces studied are different in terms of design and function. Users’ responses and meteorological conditions were examined through a series of field measurements and questionnaire surveys from November 2014 to May 2015. This study used three perceptual scales to analyze participants’ experience of Va during field surveys: “Bedford preference”, “thermal sensation” and “personal acceptability”. Analytical results yielded the wind perceptual comfort thresholds for different seasons as well as the entire study period. The results suggested that in addition to the geometry of the urban open space, the function of place could influence people’s perceptions of Va. The research findings contribute to developing thermally comfortable outdoor environments.
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Levine, J. G., P. Braesicke, N. R. P. Harris, and J. A. Pyle. "Seasonal and inter-annual variations in troposphere-to-stratosphere transport from the tropical tropopause layer." Atmospheric Chemistry and Physics 8, no. 13 (July 10, 2008): 3689–703. http://dx.doi.org/10.5194/acp-8-3689-2008.
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Abstract. In an earlier study of troposphere-to-stratosphere transport (TST) via the tropical tropopause layer (TTL), we found that the vast majority of air parcels undergoing TST from the base of the TTL enter the extratropical lowermost stratosphere quasi-horizontally and show little or no regional preference with regards to origin in the TTL or entry into the stratosphere. We have since repeated the trajectory calculations – originally limited to a single Northern Hemisphere winter period – in a variety of months and years to assess how robust our earlier findings are to change of timing. To first order, we find that the main conclusions hold, irrespective of the season, year and phase of the El Niño Southern Oscillation (ENSO). We also explore: the distribution of TST between the Northern and Southern Hemispheres; the sensitivity of modelled TST to the definition of the tropopause; and the routes by which air parcels undergo transport exclusively to the stratospheric overworld. Subject to a dynamical definition of the tropopause, we identify a strong bias towards TST in the Southern Hemisphere, particularly during the Northern Hemisphere summer. The thermal tropopause, defined according to the World Meteorological Organization, lies above the dynamical tropopause throughout the extratropics. Inevitably, on switching to the thermal definition, we calculate much less transport across the tropopause, particularly in the subtropics, which could be important with regards to interpretation of processes affecting ozone chemistry in the extratropical lowermost stratosphere (ELS). In contrast to the rather homogeneous nature of TST into the ELS, we find that transport to the overworld takes place from relatively well-defined regions of the TTL, predominantly above the West Pacific and Indonesia, except for an El Niño period in which most transport takes place from regions above the East Pacific and South America.
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Aceto, Mario D., Louis S. Harris, S. Stevens Negus, Matthew L. Banks, Larry D. Hughes, Eyup Akgün, and Philip S. Portoghese. "MDAN-21: A Bivalent Opioid Ligand Containing mu-Agonist and Delta-Antagonist Pharmacophores and Its Effects in Rhesus Monkeys." International Journal of Medicinal Chemistry 2012 (April 29, 2012): 1–6. http://dx.doi.org/10.1155/2012/327257.
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MDAN-21, 7′-{2-[(7-{2-[({(5α,6α)-4,5-Epoxy-3,14-dihydroxy-17-methylmorphin-6-yl}-aminocarbonyl)metoxy]-acetylamino}-heptylaminocarbonyl)-methoxy]-acetylamino}-naltrindole, a bivalent opioid ligand containing a mu-opioid receptor agonist (derived from oxymorphone) linked to the delta-opioid receptor antagonist (related to naltrindole) by a spacer of 21 atoms, was reported to have potent analgesic properties in mice. Tolerance, physical dependence, and conditioned place preference were not evident in that species. The finding that bivalent ligands in this series, with spacers 19 atoms or greater, were devoid of tolerance and dependence led to the proposal that MDAN-21 targets heteromeric mu-delta-opioid receptors. The present study focused on its effects in nonhuman primates (Macaca mulatta), a species with a physiology and behavioral repertoire not unlike humans. With regard to opioids, this species usually better predicts clinical outcomes. MDAN-21 substituted for morphine in morphine-dependent monkeys in the remarkably low dose range 0.006–0.032 mg/kg, subcutaneously. Although MDAN-21 failed to produce reliable thermal analgesia in the dose range 0.0032–0.032 mg/kg, intramuscularly, it was active in the same dose range and by the same route of administration, in the capsaicin-induced thermal allodynia assay. The results suggest that MDAN-21 may be useful in the treatment of opioid dependence and allodynia. The data provide additional evidence that opioid withdrawal is associated with sensitized pain.
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Karino, Genta, Aya Senoo, Tetsuya Kunikata, Yoshimasa Kamei, Hideo Yamanouchi, Shun Nakamura, Masanori Shukuya, Ricki J. Colman, and Mamiko Koshiba. "Inexpensive Home Infrared Living/Environment Sensor with Regional Thermal Information for Infant Physical and Psychological Development." International Journal of Environmental Research and Public Health 17, no. 18 (September 19, 2020): 6844. http://dx.doi.org/10.3390/ijerph17186844.
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The use of home-based image sensors for biological and environmental monitoring provides novel insight into health and development but it is difficult to evaluate people during their normal activities in their home. Therefore, we developed a low-cost infrared (IR) technology-based motion, location, temperature and thermal environment detection system that can be used non-invasively for long-term studies in the home environment. We tested this technology along with the associated analysis algorithm to visualize the effects of parental care and thermal environment on developmental state change in a non-human primate model, the common marmoset (Callithrix jacchus). To validate this system, we first compared it to a manual analysis technique and we then assessed the development of circadian rhythms in common marmosets from postnatal day 15–45. The semi-automatically tracked biological indices of locomotion velocity (BV) and body surface temperature (BT) and the potential psychological index of place preference toward the door (BD), showed age-dependent shifts in circadian phase patterns. Although environmental variables appeared to affect circadian rhythm development, principal component analysis and signal superimposing imaging methods revealed a novel phasic pattern of BD-BT correlation day/night switching in animals older than postnatal day 38 (approximately equivalent to one year of age in humans). The origin of this switch was related to earlier development of body temperature (BT) rhythms and alteration of psychological behavior rhythms (BD) around earlier feeding times. We propose that this cost-effective, inclusive sensing and analytic technique has value for understanding developmental care conditions for which continual home non-invasive monitoring would be beneficial and further suggest the potential to adapt this technique for use in humans.
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Sauer, Erin L., Rebecca C. Fuller, Corinne L. Richards-Zawacki, Julia Sonn, Jinelle H. Sperry, and Jason R. Rohr. "Variation in individual temperature preferences, not behavioural fever, affects susceptibility to chytridiomycosis in amphibians." Proceedings of the Royal Society B: Biological Sciences 285, no. 1885 (August 22, 2018): 20181111. http://dx.doi.org/10.1098/rspb.2018.1111.
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The ability of wildlife populations to mount rapid responses to novel pathogens will be critical for mitigating the impacts of disease outbreaks in a changing climate. Field studies have documented that amphibians preferring warmer temperatures are less likely to be infected with the fungal pathogen Batrachochytrium dendrobatidis ( Bd ). However, it is unclear whether this phenomenon is driven by behavioural fever or natural variation in thermal preference. Here, we placed frogs in thermal gradients, tested for temperature preferences and measured Bd growth, prevalence, and the survival of infected animals. Although there was significant individual- and species-level variation in temperature preferences, we found no consistent evidence of behavioural fever across five frog species. Interestingly, for species that preferred warmer temperatures, the preferred temperatures of individuals were negatively correlated with Bd growth on hosts, while the opposite correlation was true for species preferring cooler temperatures. Our results suggest that variation in thermal preference, but not behavioural fever, might shape the outcomes of Bd infections for individuals and populations, potentially resulting in selection for individual hosts and host species whose temperature preferences minimize Bd growth and enhance host survival during epidemics.
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Levine, J. G., P. Braesicke, N. R. P. Harris, and J. A. Pyle. "Seasonal and inter-annual variations in Troposphere-to-Stratosphere Transport from the Tropical Tropopause Layer." Atmospheric Chemistry and Physics Discussions 8, no. 1 (January 10, 2008): 489–520. http://dx.doi.org/10.5194/acpd-8-489-2008.
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Abstract. In an earlier study of troposphere-to-stratosphere transport (TST) via the tropical tropopause layer (TTL), we found that the vast majority of air parcels undergoing TST from the base of the TTL enter the extratropical lowermost stratosphere quasi-horizontally and show little or no regional preference with regards to origin in the TTL or entry into the stratosphere. We have since repeated the trajectory calculations - originally limited to a single northern hemisphere winter period - in a variety of months and years to assess how robust our earlier findings are to change of timing. To first order, we find that the main conclusions hold, irrespective of the season, year and phase of the El Niño Southern Oscillation (ENSO). We also explore: the distribution of TST between the northern and southern hemispheres; the sensitivity of modelled TST to the definition of the tropopause; and the routes by which air parcels undergo transport exclusively to the stratospheric overworld. Subject to a dynamical definition of the tropopause, we identify a strong bias towards TST in the southern hemisphere, particularly during the northern hemisphere summer. The main difference on switching to the World Meteorological Organization's thermal tropopause definition is that much less TST is modelled in the subtropics and, relative to the dynamical definition, we calculate significantly less transport into the extratropical lowermost stratosphere (ELS) – an important region with regards to ozone chemistry. In contrast to the rather homogeneous nature of TST into the ELS, we find that transport to the overworld takes place from relatively well-defined regions of the TTL, predominantly above the West Pacific and Indonesia, except for an El Niño period in which most transport takes place from regions above the East Pacific and South America.
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Dumitrascuta, Maria, Marcel Bermudez, Olga Trovato, Jolien De Neve, Steven Ballet, Gerhard Wolber, and Mariana Spetea. "Antinociceptive Efficacy of the µ-Opioid/Nociceptin Peptide-Based Hybrid KGNOP1 in Inflammatory Pain without Rewarding Effects in Mice: An Experimental Assessment and Molecular Docking." Molecules 26, no. 11 (May 28, 2021): 3267. http://dx.doi.org/10.3390/molecules26113267.
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Opioids are the most effective analgesics, with most clinically available opioids being agonists to the µ-opioid receptor (MOR). The MOR is also responsible for their unwanted effects, including reward and opioid misuse leading to the current public health crisis. The imperative need for safer, non-addictive pain therapies drives the search for novel leads and new treatment strategies. In this study, the recently discovered MOR/nociceptin (NOP) receptor peptide hybrid KGNOP1 (H-Dmt-D-Arg-Aba-β-Ala-Arg-Tyr-Tyr-Arg-Ile-Lys-NH2) was evaluated following subcutaneous administration in mouse models of acute (formalin test) and chronic inflammatory pain (Complete Freund’s adjuvant-induced paw hyperalgesia), liabilities of spontaneous locomotion, conditioned place preference, and the withdrawal syndrome. KGNOP1 demonstrated dose-dependent antinociceptive effects in the formalin test, and efficacy in attenuating thermal hyperalgesia with prolonged duration of action. Antinociceptive effects of KGNOP1 were reversed by naltrexone and SB-612111, indicating the involvement of both MOR and NOP receptor agonism. In comparison with morphine, KGNOP1 was more potent and effective in mouse models of inflammatory pain. Unlike morphine, KGNOP1 displayed reduced detrimental liabilities, as no locomotor impairment nor rewarding and withdrawal effects were observed. Docking of KGNOP1 to the MOR and NOP receptors and subsequent 3D interaction pattern analyses provided valuable insights into its binding mode. The mixed MOR/NOP receptor peptide KGNOP1 holds promise in the effort to develop new analgesics for the treatment of various pain states with fewer MOR-mediated side effects, particularly abuse and dependence liabilities.
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Caputa, M., A. Nowakowska, J. Rogalska, and K. Wentowska. "Winter torpor in Helix pomatia: regulated defence mechanism or forced inactivity?" Canadian Journal of Zoology 83, no. 12 (December 1, 2005): 1608–13. http://dx.doi.org/10.1139/z05-160.
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We examined Helix pomatia L., 1758 snails to answer two questions. First, is their winter dormancy facilitated by cold-seeking behaviour, or is it rather a passive phenomenon imposed by cold weather? Second, what thermal conditions are necessary to arouse these snails out of torpor in midwinter and in spring? Snails, collected from natural habitats, were placed in a temperature-gradient apparatus. Their thermal preference was recorded for 48 h under natural photoperiod in early spring, midsummer, and autumn. The autumn recording was continued until the end of November on non-starved and starved snails. Two additional sessions were performed on torpid snails in January (latencies of arousals from torpor at various temperatures and immediate thermal preferences were recorded) and in February (they were kept permanently in darkness at 5 °C and their spontaneous arousals were examined). Temperature selected in spring (23.60 ± 0.15 °C) was significantly lower than that in summer (26.90 ± 0.05; P < 0.05) and in autumn (27.50 ± 0.10 °C; P < 0.01). The prolonged autumn recording did not show cold-seeking behaviour either in non-starved or in starved snails. Threshold temperature inducing midwinter arousals was 10 °C and the aroused snails immediately selected temperatures indistinguishable from those in summer and autumn. Spontaneous arousals from torpor in the snails continuously exposed to cold occurred within a period of arousals in the field. In conclusion, winter torpor of the snails displays unique properties, i.e., its start and maintenance are passive phenomena, while its spring interruption is a precisely controlled, endogenous mechanism.
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Robbins, Lindsey A., Angela R. Green-Miller, Jay S. Johnson, and Brianna N. Gaskill. "One Is the Coldest Number: How Group Size and Body Weight Affect Thermal Preference in Weaned Pigs (3 to 15 kg)." Animals 11, no. 5 (May 18, 2021): 1447. http://dx.doi.org/10.3390/ani11051447.
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Housing pigs within their thermal comfort zone positively impacts productivity and performance. However, fundamental information on behavioral thermoregulatory responses of individual and group-housed pigs is meager. As a gregarious species, pigs prefer to be near one another, touching and often huddling. As pigs huddle together, they decrease their heat loss to the environment by decreasing exposed surface area and increasing mass. Additionally, pigs gain weight rapidly as they age. As an individual grows, their ability to withstand lower temperatures increases. We hypothesized that group size would alter pig thermal preference and that thermal preference would change based upon body weight. Thirty-six groups of pigs (n = 2 pigs/group) were tested in a factorial design based on group size (1, 2, or 4) and weight category (small: 5.20 ± 1.15 kg; medium: 8.79 ± 1.30 kg; and large: 13.95 ± 1.26 kg) in both sexes. Treatment groups were placed inside a chamber with a controlled thermal gradient (4.6 m × 0.9 m × 0.9 m; L × W × H) that ranged in temperature from 18 to 30 °C. Pigs habituated to the gradient for 24 h. The following 24 h testing period was continuously video recorded and each pig’s location during inactivity (~70% daily budget) within the thermal apparatus was recorded every 10 min via instantaneous scan sampling. Data were analyzed using a GLM and log10 + 0.001 transformed for normality. Tukey tests and Bonferroni-corrected custom tests were used for post hoc comparisons. Peak temperature preference was determined by the maximum amount of time spent at a specific temperature. Both group size (p = 0.001) and weight category (p < 0.001) influenced the thermal location choice of pigs. Individual pigs preferred 30.31 °C, which differed from a group of 2 (20.0 °C: p = 0.003) and 4 pigs (20.0 °C: p < 0.001). The peak temperature preference of the small pigs (30.2 °C) differed from the large pigs (20.0 °C: p < 0.001) but did not differ from the medium-sized pigs (28.4 °C: p > 0.05). Overall, heavier pigs and larger groups preferred cooler temperatures.
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Linhoss, John E., Joseph L. Purswell, and Jeremiah D. Davis. "Radiant Flux Preference of Neonatal Broiler Chicks During Brooding." Transactions of the ASABE 61, no. 4 (2018): 1417–23. http://dx.doi.org/10.13031/trans.12775.
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Abstract. Radiant heat is the most common method of providing supplemental heat in a broiler house. However, little information exists about chick preference for radiant flux. Identifying the ranges of radiant flux that chicks prefer would allow improved management of the thermal environment. The objectives of this study were to determine the radiant flux ranges preferred by broiler chicks during the first eight days of brooding. Three trials were conducted using straight-run broiler chicks. A total of 88 chicks were randomly allocated into two mixed-gender groups and placed into identical 1 m × 4 m pens for 8 d. Heat lamps were used to create radiant flux zones of 30, 70, 175, and 450 W m-2 in each pen. Chicks were allowed to move freely between the zones, and feed and water were available in each treatment area. Chick location was recorded with a camera at 5 min intervals. For each image, non-linear regression analysis was applied to the cumulative proportion of chicks in each treatment. The resulting equations were used to calculate the range of radiant flux values for which 80% of the chicks exhibited a preference. Chicks exhibited a preference for decreasing radiant flux with age. The mean maximum preferred radiant flux for all trials decreased from 409.4 W m-2 at 1 d to 304.4 W m-2 at 8 d. The mean minimum preferred radiant flux for all trials decreased from 114.5 W m-2 at 1 d to 31.4 W m-2 at 8 d. Keywords: Broiler chicks, Brooding, Radiant flux, Radiant heaters, Thermal preference.
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Pereira da Silva, Shirley Seixas, Patricia Gonçalves Guedes, Flávia Silva Severino, and Juliana Cardoso Almeida. "Biology and parasites of Pteronotus gymnonotus from the Caatinga shrublands of Ceará (Brazil)." Therya 12, no. 1 (January 30, 2021): 131–37. http://dx.doi.org/10.12933/therya-21-1078.
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Mormoopid bats are distributed from southern United States of America to Brazil and comprise the genera Mormoops and Pteronotus. Although forms of Mormoops in Bahia, Brazil were described for the Quaternary, only some of the extant species of Pteronotus occur in this country, including P. gymnonotus. The species distribution ranges from southeastern México to northeastern Bolivia and central Brazil. This work presents information about food preference, reproduction, and the ectoparasitological fauna of P. gymnonotus in the state of Ceará. Fieldwork took place over ten consecutive days in the rain and dry seasons, in 2000, 2012, 2013, and 2019, on trails within the Serra das Almas Private Natural Heritage Reserve. A total of 14 P. gymnonotus specimens were caught in the three main phytophysiognomies present in the region. They were inspected for ecto and endoparasites, and fecal material was collected and analyzed under a light microscope. Of the total collected females, four were pregnant and one was lactating in January, during the rain season. No food residues or evidence of endoparasites were observed in the gastric content of the animals. Regarding the fecal samples, fragments of insects were found and identified as belonging to the orders Coleoptera and Lepidoptera. Seven individuals were infested with ectoparasites of the subfamily Acari and newly described associations with Diptera genera are presented. Due to the scarcity of data about these bats in the Caatinga biome, data reported here help explain the ecological interactions of P. gymnonotus in this semiarid area in Brazil.
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Mijail De-la-Cruz, Ivan, Alondra Castro-Campillo, and Arturo Salame-Méndez. "Habitat heterogeneity facilitates coexistence of two syntopic species of Peromyscus in a temperate forest of Central México." Therya 12, no. 3 (September 19, 2021): 487–500. http://dx.doi.org/10.12933/therya-21-1113.
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An essential topic in ecology is to understand how the structure of the habitat and its changes in space and time (i. e., habitat heterogeneity) affect the frequency and interactions between cohabiting species. Here, we assessed the effect of the biotic and abiotic components that configure the microhabitat heterogeneity and its temporal shifts (dry and rainy seasons), on the frequency (total and by sex) of two congeneric species, Peromyscus difficilis and P. melanotis, that co-occurs in a temperate forest of Central Mexico. To address this, an experimental plot composed of 120 sampling stations was placed within a temperate forest in the National Park Desierto de los Leones, Mexico City. In each sampling station, we set Sherman traps to capture mice of two syntopic Peromyscus, and we also evaluated six variables related to the spatial heterogeneity of the habitat during two rainy seasons. Our results revealed differential effects of habitat heterogeneity on the frequency of each species. Moreover, habitat heterogeneity also had a different effect on male and female frequencies of each Peromyscus species. While P. difficilis was captured more frequently in sampling stations with high presence and coverage of logs in the soil, P. melanotis was regularly captured in sampling stations with high vegetation cover and plant species richness. Thus, it seems that the different requirements and habitat preferences of these two Peromyscus species facilitate their spatial and temporal coexistence in this mid-latitude temperate forest. In general, we provide evidence of the importance of studying the heterogeneity of the habitat to better understand the interactions between syntopic species, offering new insights into the spatial and temporal mechanisms that could determine its coexistence at local scale.
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Patel, Jayshree S., Thomas Chouvenc, and Nan-Yao Su. "Temperature Preference of Two Invasive Subterranean Termite Species and Their Hybrids (Blattodea: Rhinotermitidae: Coptotermes)." Journal of Economic Entomology 112, no. 6 (August 10, 2019): 2888–93. http://dx.doi.org/10.1093/jee/toz210.
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Abstract Temperature preference of two invasive subterranean termites, Coptotermes gestroi (Wasmann) and Coptotermes formosanus Shiraki (Blattodea: Rhinotermitidae), and their hybrids were determined in a horizontal thermal gradient. The activity of workers of four mating combinations: ♀C. gestroi × ♂C. gestroi (C. gestroi), ♀C. formosanus × ♂C. formosanus (C. formosanus), ♀C. gestroi × ♂C. formosanus (Hybrid G), and ♀C. formosanus × ♂C. gestroi (Hybrid F), when placed on the temperature gradients were videotaped and analyzed to determine the mean temperature preference values (mTPV). The temperature ranges for active termites were 21.9–39.5°C for C. gestroi, 11.1–39.5°C for C. formosanus, 25.3–38.2°C for Hybrid G, and 24.9–39.3°C for Hybrid F. There was no significant difference in the mTPV of C. gestroi and both hybrid mating combinations. The mTPV of both Hybrid G and Hybrid F was significantly higher than the parental species C. formosanus. Our results indicate that hybrid populations of C. formosanus and C. gestroi might be more active in tropical than temperate regions, and if established in temperate regions, they will be more active in summer months when the mean temperature exceeds 25°C.
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Camp, Carlos D., Jessica A. Wooten, John B. Jensen, and Dale F. Bartek. "Role of temperature in determining relative abundance in cave twilight zones by two species of lungless salamander (family Plethodontidae)." Canadian Journal of Zoology 92, no. 2 (February 2014): 119–27. http://dx.doi.org/10.1139/cjz-2013-0178.
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Lungless salamanders of the family Plethodontidae have historically been considered to be passive conformers to their surrounding thermal environment because there is no evidence that they thermoregulate behaviourally in the field. In contrast, plethodontids readily choose optimal temperatures when placed on experimental thermal gradients. It has been hypothesized that restriction to moist habitats prevents these salamanders from exploiting thermally diverse microhabitats in nature. We tested this hypothesis, as well as the hypothesis that response to temperature differs among plethodontid species, by investigating the thermal ecology of two species (Cave Salamander, Eurycea lucifuga Rafinesque, 1822, and Northern Slimy Salamander, Plethodon glutinosus (Green, 1818)) occupying twilight zones of six caves in northwestern Georgia. We recorded inside and outside temperatures, as well as the number of each species, for each of three seasons (summer, fall, spring) over 13 years. We also tested for differences in thermal preference along experimental gradients in the laboratory. We further generated environmental niche models (ENMs) to investigate the potential role of abiotic variables, including environmental temperature, in determining the geographic range of each species. We found that both species responded to cave temperature in such a way as to suggest that these salamanders thermoregulate behaviourally when given a diversity of thermal options within a relatively constant moisture regime. We also determined that E. lucifuga prefers lower temperatures than P. glutinosus. ENM analysis indicated that, while abiotic variables both strongly influence the ecological niche of both species, the range of E. lucifuga is strongly predicted by them. The geographic distribution of P. glutinosus is apparently heavily influenced by the presence of closely related, contiguous neighbors with similar niche requirements.
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Majchrzak, Michael W., and John Warkentin. "Thermolysis of 2-acyloxy-Δ3-1,3,4-oxadiazolines. Evidence for a preferred sense of cycloreversion to carbonyl ylides and for fast 1,4-sigmatropic ylide rearrangement." Canadian Journal of Chemistry 67, no. 11 (November 1, 1989): 1753–59. http://dx.doi.org/10.1139/v89-271.
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Thermolysis of 2-acyloxy-2,5,5-trialkyl-Δ3-1,3,4-oxadiazolines in benzene solution at 80 °C furnishes acyloxy-substituted enol ethers (hemiacylals) in high yield. Mixtures of cis:trans isomers of such oxadiazolines afford mixtures of isomeric hemiacylals in nearly the same ratio. Those and other results are rationalized in terms of cycloreversion of the oxadiazolines to carbonyl ylides that are not equilibrated during their lifetimes and undergo primarily 1,4-sigmatropic H-migration. Some fragmentation of the ylides to anhydrides and carbenes was also observed. A consistent mechanistic account includes concerted suprafacial (4π + 2π) cycloreversion in the sense that places a large ylide substituent at C-1 or at C-3, preferentially exo. A smaller preference for the cycloreversion that places the acetoxy group at C-1 in the endo position, when the steric effect of the alkyl group at C-1 is small, can be inferred. The possibility that the overall 1,4-H shift is the result of sequential 1,7-antarafacial and 1,4-suprafacial shifts, in some cases, is considered. Keywords: carbonyl ylide; 1,4-sigmatropic rearrangement; cycloreversion, thermal, of oxadiazolines; ylide, carbonyl; oxadiazoline, thermolysis of.
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Picard, Gabriel, Gabriel Blouin-Demers, and Marie-Andrée Carrière. "Common Musk Turtles (Sternotherus odoratus) select habitats of high thermal quality at the northern extreme of their range." Amphibia-Reptilia 32, no. 1 (2011): 83–92. http://dx.doi.org/10.1163/017353710x541913.
Full textAbstract:
AbstractIn ectotherms, variation in body temperature (Tb) affects physiological performance and, ultimately, fitness. Therefore, reptiles regulate Tb behaviourally by choosing habitats of optimal temperature. The main goal of this study was to determine the link between patterns of thermoregulation and habitat selection in Common Musk Turtles inhabiting a thermally challenging region. We expected habitat selection to be based on the fulfillment of thermoregulatory requirements, which can be accomplished by selecting thermally superior habitats. From early May to late August 2007, we tracked 22 Common Musk Turtles with temperature-sensitive radio-transmitters and collected daily Tb profiles with automated radio-telemetry data loggers. In addition, temperature data loggers were placed in the study area to measure the range of environmental operative temperatures (Te) available to musk turtles. The habitats with the highest thermal quality were aquatic habitats with surface cover (i.e., lily pads, macrophytes, etc.) followed by shallow water. As expected, musk turtles used habitats non-randomly and had a strong preference for thermally superior habitats. This is consistent with the typical aquatic basking behaviour observed in musk turtles, suggesting that there is a strong link between thermal quality of habitats and habitat selection, even in this almost entirely aquatic turtle.
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Lathlean, Justin A., David J. Ayre, Ross A. Coleman, and Todd E. Minchinton. "Using biomimetic loggers to measure interspecific and microhabitat variation in body temperatures of rocky intertidal invertebrates." Marine and Freshwater Research 66, no. 1 (2015): 86. http://dx.doi.org/10.1071/mf13287.
Full textAbstract:
Until recently, marine scientists have relied heavily on satellite sea surface temperatures and terrestrial weather stations as indicators of the way in which the thermal environment, and hence the body temperatures of organisms, vary over spatial and temporal scales. We designed biomimetic temperature loggers for three species of rocky intertidal invertebrates to determine whether mimic body temperatures differ from the external environment and among species and microhabitats. For all three species, microhabitat temperatures were considerably higher than the body temperatures, with differences as great as 11.1°C on horizontal rocky substrata. Across microhabitats, daily maximal temperatures of the limpet Cellana tramoserica were on average 2.1 and 3.1°C higher than body temperatures of the whelk Dicathais orbita and the barnacle Tesseropora rosea respectively. Among-microhabitat variation in each species’ temperature was equally as variable as differences among species within microhabitats. Daily maximal body temperatures of barnacles placed on southerly facing vertical rock surfaces were on average 2.4°C cooler than those on horizontal rock. Likewise, daily maximal body temperatures of whelks were on average 3.1°C cooler within shallow rock pools than on horizontal rock. Our results provide new evidence that unique thermal properties and microhabitat preferences may be important determinants of species’ capacity to cope with climate change.
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Grodzicki, Przemysław, Bartosz Piechowicz, and Michał Caputa. "The Effect of the Queen’s Presence on Thermal Behavior and Locomotor Activity of Small Groups of Worker Honey Bees." Insects 11, no. 8 (July 23, 2020): 464. http://dx.doi.org/10.3390/insects11080464.
Full textAbstract:
We examined effects of the queen’s presence on diurnal rhythms of temperature preference (TP) and locomotor activity (LA) in worker honeybees’ groups. TP and LA of six queenless and six queenright (with the queen) groups of bees, consisting of 7–8 worker bees, were recorded in a thermal gradient system for four days, under light to darkness (LD) 12:12 photoperiod. The same experiments were conducted on five virgin queens (of the same age as those in the queenright groups), which were placed individually in the gradient chambers. The single virgin queens showed signs of distress and no rhythms of TP and LA. In contrast, there were diurnal rhythms of TP and LA in both group variants with daytime activity and nighttime rest. However, the queen’s presence exerted a strong calming effect, reducing LA of bees both at day- and nighttime. The nighttime minimum LA of queenright groups was five times lower than that in queenless groups. Moreover, there was a reversal of the diurnal pattern of TP in queenright groups. The results are discussed in terms of the bee colony organization as a superorganism.
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HELLENBRECHT, L. M., M. FREESE, J.-D. POHLMANN, H. WESTERBERG, T. BLANCKE, and R. HANEL. "Larval distribution of the ocean sunfishes Ranzania laevis and Masturus lanceolatus (Tetraodontiformes: Molidae) in the Sargasso Sea subtropical convergence zone." Journal of Plankton Research 41, no. 5 (September 2019): 595–608. http://dx.doi.org/10.1093/plankt/fbz057.
Full textAbstract:
Abstract Sunfishes or Molidae are a rarely encountered family within the teleost order Tetraodontiformes and most details of their reproductive biology including times and places of spawning and their larval ecology are rather unclear. Spawning of two species of Molidae was suggested in the Sargasso Sea before, yet comprehensive data on larval distribution from this area or elsewhere have never been published. Here we report on the abundance and size distribution of 383 sharptail mola (Masturus lanceolatus) and slender sunfish (Ranzania laevis) larvae, present novel information on their larval growth and development and test correlations with prevailing hydrographic data. Only 18 mostly larger Masturus larvae were caught evenly distributed over the study area and with no obvious hydrographic preferences. We conclude that there was no active spawning of M. lanceolatus in the area during the time of the cruise. In contrast, Ranzania larvae were caught primarily inside and south of a thermal frontal zone with increasing abundances toward warmer surface layers in the southeast of the study area. Due to the consistent presence of young Ranzania, it can be assumed that spawning activity was ongoing throughout the month of April, 2015. Our findings confirm the Sargasso Sea as a spawning area for R. laevis.
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Crossin, G. T., S. A. Al-Ayoub, S. H. Jury, W. H. Howell, and W. H. Watson. "Behavioral thermoregulation in the American lobster Homarus americanus." Journal of Experimental Biology 201, no. 3 (February 1, 1998): 365–74. http://dx.doi.org/10.1242/jeb.201.3.365.
Full textAbstract:
It is generally accepted that water temperature has a strong influence on the behavior of the American lobster Homarus americanus. However, there is surprisingly little behavioral evidence to support this view. To characterize the behavioral responses of lobsters to thermal gradients, three different experiments were conducted. In the first, 40 lobsters acclimated to summer water temperatures (summer-acclimated, 15.5±0.2 °C, mean ± s.e.m.) were placed individually in an experimental shelter, and the temperature in the shelter was gradually raised until the lobster moved out. Lobsters avoided water warmer than 23.5±0.4 °C, which was an increase of 8.0±0.4 °C from ambient summer temperatures. When this experiment was repeated with lobsters acclimated to winter temperatures (winter-acclimated, 4.3±0.1 °C), the lobsters (N=30) did not find temperature increases of the same magnitude (T=8.0±0.4 °C) aversive. The second experiment was designed to allow individual summer-acclimated lobsters (N=22) to select one of five shelters, ranging in temperature from 8.5 to 25.5 °C. After 24 h, 68 % of the lobsters occupied the 12.5 °C shelter, which was slightly above the ambient temperature (approximately 11 °C). In a similar experiment, winter-acclimated lobsters (N=30) were given a choice between two shelters, one at ambient temperature (4.6±0.2 °C) and one at a higher temperature (9.7±0.3 °C). Winter-acclimated lobsters showed a strong preference (90 %) for the heated shelter. In the final experiment, summer-acclimated lobsters (N=9) were allowed to move freely in a tank having a thermal gradient of approximately 10 °C from one end to the other. Lobsters preferred a thermal niche of 16.5±0.4 °C and avoided water that was warmer than 19 °C or colder than 13 °C. When standardized for acclimation temperature, lobsters preferred water 1.2±0.4 °C above their previous ambient temperature. Collectively, the results of these studies indicate that lobsters are capable of sensing water temperature and use this information to thermoregulate behaviorally. The implications of these findings for lobster behavior and distribution in their natural habitat are discussed.
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Roy, Moumita, Chandreyee Chowdhury, and Nauman Aslam. "Designing Transmission Strategies for Enhancing Communications in Medical IoT Using Markov Decision Process." Sensors 18, no. 12 (December 15, 2018): 4450. http://dx.doi.org/10.3390/s18124450.
Full textAbstract:
The introduction of medical Internet of Things (IoT) for biomedical applications has brought about the era of proactive healthcare. Such advanced medical supervision lies on the foundation of a network of energy-constrained wearable or implantable sensors (or things). These miniaturized battery-powered biosensor nodes are placed in, on, or around the human body to measure vital signals to be reported to the sink. This network configuration deployed on a human body is known as the Wireless Body Area Network (WBAN). Strategies are required to restrict energy expenditure of the nodes without degrading performance of WBAN to make medical IoT a green (energy-efficient) and effective paradigm. Direct communication from a node to sink in WBAN may often lead to rapid energy depletion of nodes as well as growing thermal effects on the human body. Hence, multi-hop communication from sources to sink in WBAN is often preferred instead of direct communication with high transmission power. Existing research focuses on designing multi-hop protocols addressing the issues in WBAN routing. However, the ideal conditions for multi-hop routing in preference to single-hop direct delivery is rarely investigated. Accordingly, in this paper an optimal transmission policy for WBAN is developed using Markov Decision Process (MDP) subject to various input conditions such as battery level, event occurrence, packet transmission rate and link quality. Thereafter, a multi-hop routing protocol is designed where routing decisions are made following a pre-computed strategy. The algorithm is simulated, and performance is compared with existing multi-hop protocol for WBAN to demonstrate the viability of the proposed scheme.
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Borsos, Ágnes, Erzsébet Szeréna Zoltán, Éva Pozsgai, Balázs Cakó, Gabriella Medvegy, and János Girán. "The Comfort Map—A Possible Tool for Increasing Personal Comfort in Office Workplaces." Buildings 11, no. 6 (May 29, 2021): 233. http://dx.doi.org/10.3390/buildings11060233.
Full textAbstract:
Previous studies have shown that indoor environmental quality (IEQ) parameters may have a considerable effect on office employees’ comfort, health and performance. Therefore, we initiated a research program to help occupants identify IEQ parameters they perceive as risk factors for their health in an office and enhance their comfort levels in an office environment. Since we assumed that office employees might have different indoor environmental quality expectations related to their work area and that these differences could be measured, our objective was to develop an office ‘comfort map’ based on occupants’ individual IEQ preferences. Thus, the goal of the comfort map would be to help tailor office spaces to their occupants’ health and comfort expectations. The comfort survey was developed to assess the comfort-related opinions of the occupants, based on IEQ parameters (visual comfort, acoustic comfort, air quality and thermal comfort) of a chosen open-plan office building. The survey also assessed the degree to which the given IEQ parameter was considered a health risk factor by occupants or caused a negative comfort sensation for them. The survey was filled in by 216 occupants. The answers were then analyzed with the help of a frequency table depicting relative frequency. The measurements of IEQ parameters took place in an open-plan office in the chosen office building (a Hungarian subsidiary’s office building belonging to an international company in Budapest). The occupants had different opinions regarding the perceived effects of the IEQ parameters on their health and comfort. Almost two-thirds of the respondents (64.8%) were dissatisfied with the adjustability of the noises and sounds IEQ parameter at their workstation. Furthermore, half of the respondents (50.1%) were dissatisfied with the adjustability of ventilation. Most of the occupants (45.8%) considered noises and sounds as the IEQ parameter that had a negative effect on their health. There were also IEQ differences between different areas of the office space. Based on these results, a comfort map was developed for the office. The comfort map contains information about the IEQ characteristics of each workstation by depicting the thermal comfort, carbon dioxide, visual comfort and acoustic comfort characteristics of a given workstation on a relative scale. Based on the thermal, air, acoustic, and lighting differences between the workstations, occupants can select their preferred workstations when a desk-sharing system works. Although still in its pilot phase, the comfort map could increase the chances for office employees to find the workstation best suited to their IEQ expectations. This could improve occupants’ overall comfort level, which could in turn enhance occupants’ productivity and mental as well as physical health.
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Verbitsky, V. B., N. Y. Poddubnaya, and T. I. Verbitskaya. "Motor activity of Daphnia magna (Crustacea, Cladocera) during thermal selection: Peculiarities of search reactions in the non-uniform environment." Biosystems Diversity 26, no. 2 (August 20, 2018): 111–16. http://dx.doi.org/10.15421/011817.
Full textAbstract:
We conducted a study of the peculiarities of the motor activity of juvenile and adult individuals of Daphnia magna in the process of thermal selection. On the example of Daphnia, we experimentally proved the assumption that the decrease in the motor activity of the ectotherms in the selected temperature range is a behaviour mechanism typical for thermal selection. The experiment was conducted on the offspring of one parthenogenetic female (pure line) of a laboratory culture maintained over several years at room temperature. The Daphnia individuals had been beforehand acclimated over several generations to 23.4 ºС, and then were placed in a thermogradient apparatus. The control individuals were maintained at room temperature. The final temperature preference was determined using the so-called "chronic" method, when the tested organisms are maintained in a thermogradient apparatus over several days. The positions of the Daphnia individuals were recorded daily during 24 days. As a parameter which would characterize the motor activity of Daphnia, we used the parameter of average relative shifting, which was calculated as a difference (in cm) between the position they were found in two sequential records, divided by time (in min) between these records. Over the first 3 days, in the conditions of the temperature gradient, the Daphnia mostly selected heightened temperatures (24–28 ºС). During the period from the 4th to 24th day, 74% of the Daphnia selected the range of 18–23 ºС and 85% – 17–24 ºС. Thus, the range of the ultimate selected temperatures decreased by 4 ºС compared to the initially selected temperatures and enlarged by 3 ºС towards the lower temperatures. In the thermogradient apparatus, the parthenogenetic females had the lowest value of the mean relative movement. In the control, at room temperature, this parameter of the adults was by 43% higher compared to the gradient. The pattern of the dynamic of the indicator in both variants of the experiment was similar for the periods and phases of fluctuations. With the juveniles the value of the parameter of mean relative shifting in the gradient was higher by 40% compared to the adult Daphnia, but close to the parameter of the adults in the control. We determined a relationship between the juveniles selecting the higher temperatures and higher mean relative shifting, which indicates a relationship between the behavioural selective reaction of juvenile Daphnia and general physiological condition of their organism. During the absence of the temperature gradient, the Daphnia were observed to show symmetry in their motor reaction. Occurrence of the asymmetry of the motor reaction of the Daphnia in the condition of the thermogradient, manifesting in the prevalence of shifting to lower or higher temperatures, can indicate more clearly manifested search reaction in the condition of a non-uniform environment.
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SALTE, K., G. LEA, M. FRANEK, and S. VACULIN. "Baclofen Reversed Thermal Place Preference in Rats With Chronic Constriction Injury." Physiological Research, April 15, 2016, 349–55. http://dx.doi.org/10.33549/physiolres.933008.
Full textAbstract:
Chronic constriction injury to the sciatic nerve was used as an animal model of neuropathic pain. Instead of frequently used reflex-based tests we used an operant thermal place preference test to evaluate signs of neuropathic pain and the effect of baclofen administration in rats with neuropathy. Chronic constriction injury was induced by four loose ligations of the sciatic nerve. Thermal place preference (45 °C vs. 22 °C and 45 °C vs. 11 °C) was measured after the ligation and after the administration of baclofen in sham and experimental rats. Rats with the chronic constriction injury spent significantly less time on the colder plate compared to sham operated animals at the combination 45 °C vs. 11 °C. After administration of baclofen (10 mg/kg s.c.), the aversion to the colder plate in rats with chronic constriction injury disappeared. At the combination 45 °C vs. 22 °C, no difference in time spent on colder and/or warmer plate was found between sham and experimental animals. These findings show the importance of cold allodynia evaluation in rats with chronic constriction injury and the effectiveness of baclofen in this neuropathic pain model.
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Constantino, Pedro B., Veronica S. Valentinuzzi, and André F. Helene. "Division of labor in work shifts by leaf-cutting ants." Scientific Reports 11, no. 1 (April 22, 2021). http://dx.doi.org/10.1038/s41598-021-88005-0.
Full textAbstract:
AbstractForaging rhythms in eusocial insects are determined by the colony´s overall pattern. However, in leaf-cutting ant workers, individual rhythms are not fully synchronized with the colonies’ rhythm. The colony as a whole is nocturnal, since most worker activity takes place at night; however some workers forage during the day. Previous studies in individualized ants suggest nocturnal and diurnal workers coexistence. Here observations within the colony, in leaf-cutting ants, showed that workers have differential foraging time preference, which interestingly is associated to body size and differential leaf transportation engagement. Nocturnal ants are smaller and less engaged in leaf transportation whereas diurnal ants are bigger and more engaged in leaf carriage. Mechanisms underlying division of labor in work shifts in ants are still unknown but much can be extrapolated from honeybees; another social system bearing a similar pattern. A collective organization like this favors constant exploitation of food sources while preserving natural individual rhythm patterns, which arise from individual differences, and thermal tolerance, given by the size polymorphism presented by this species.
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Herczeg, Gábor, Tibor Kovács, Zoltán Korsós, and János Török. "Microhabitat use, seasonal activity and diet of the snake-eyed skink (Ablepharus kitaibelii fitzingeri) in comparison with sympatric lacertids in Hungary." Biologia 62, no. 4 (January 1, 2007). http://dx.doi.org/10.2478/s11756-007-0092-6.
Full textAbstract:
AbstractMicrohabitat selection and seasonal activity of the snake-eyed skink, Ablephaus kitaibelii fitzingeri, are compared to the two lacertid lizards (Lacerta viridis and Podarcis muralis) that co-occur in many of its habitats. The food composition of A. k. fitzingeri is also described. Significant differences in microhabitat selection and seasonal activity among the three species were found. The snake-eyed skink was associated with open grasslands, and with a low level of scrub, bare soil and rock cover. The microhabitat preference of L. viridis was quite similar to that of the skink, but with a higher preference for scrub. P. muralis occurred in places with greater rock and bare soil cover, and more scrub than A. k. fitzingeri. Activity of the snake-eyed skink decreased dramatically in summer, probably because of the reduced thermal inertia originating from the extremely small size of this species, but its seasonal activity overlapped with those of the lacertids. Stomach content analysis of the snake-eyed skink suggests that it is a generalist predator of small, mainly flightless arthropod prey. Competition with juvenile lacertids and predation by adult L. viridis are conceivable for the snake-eyed skink.
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Robles, Cecilia Inés, Gilda Luciana Vivas, and Monique Halloy. "Substrate Use and its Effect on Body Temperature in two Syntopic Liolaemus Lizards in Northwestern Argentina." Basic and Applied Herpetology, August 13, 2019. http://dx.doi.org/10.11160/bah.160.
Full textAbstract:
Habitat use and thermal biology are closely related, because thermal microclimates vary spatially. The use of habitat and microhabitat by different species influences many of their traits, such as their physiology, and may, therefore exert a direct effect on survival. Ectothermal animals, such as lizards, are affected by thermal and biophysical environments they inhabit, and the particular use of a given substrate reflects an overlap between thermally adequate microhabitats, and behavioral preferences. By exploiting certain microhabitats and avoiding others, many lizards tend to maintain their body temperature within a range that allows maximum performance. Here, we evaluate how two syntopic species of lizards, Liolaemus pacha and L. ramirezae, use substrates with different exposure to solar radiation. Our hypothesis is that L. pacha uses both soil and rock substrates indistinctly, due to being a generalist species, whereas L. ramirezae uses the rock substrate more frequently, due to its saxicolous habits. We expect temperatures to be different both in substrates, and in different exposures, and thermal characteristics of each species to condition their use. For example, because the body temperature range of L. pacha is wider, we predict that substrate use will be wider. A pre-established 100x75 m area was monitored during four Austral springs and summers between 2011 and 2015, in Los Cardones, Amaicha del Valle, Tucumán, Argentina. Species' substrate where the lizard was found (soil or rock), and exposure to solar radiation: sun, filtered shade or full shade was recorded. After capture, lizard body temperature (Tb), substrate temperature (Ts), and air temperature (Ta) were recorded in the place of the first observation of the lizard. Obtained results show that L. pacha and L. ramirezae had a more persistent use of the rock than the soil substrate, thus considering them saxicolous species. Further, they were frequently observed exposed to direct sunlight. Average body temperature was higher than environmental temperature (Ts and Ta), and significantly different in each exposure type (sun, filtered shade and full shade), and in both substrates (rock and soil). Differential use of substrate and the relationship between body temperature and microhabitat temperatures suggests that L. pacha and L. ramirezae are “active thermoregulators”, using both substrate surfaces and solar radiation as heat sources.