Journal of thermal biology最新文献

{"title":"High thermal quality rookeries facilitate high thermoregulatory accuracy in pregnant female rattlesnakes","authors":"Haley A. Moniz ,&nbsp;Jack H. Buck ,&nbsp;Hayley L. Crowell ,&nbsp;Scott M. Goetz ,&nbsp;Trevor D. Ruiz ,&nbsp;Emily N. Taylor ,&nbsp;Scott M. Boback","doi":"10.1016/j.jtherbio.2024.103948","DOIUrl":"10.1016/j.jtherbio.2024.103948","url":null,"abstract":"<div><p>Temperature is a primary factor influencing organismal development, and the fluctuating daily and seasonal thermal regimes of temperate climates may challenge the ability of viviparous reptiles to optimize body temperatures during gestation. Testing how viviparous reptiles navigate highly variable thermal conditions (e.g., relatively cold nights and/or highly fluctuating temperatures) is a powerful way to understand how they use microhabitats for thermoregulatory benefits. We assessed the thermal ecology of pregnant and non-pregnant female Prairie Rattlesnakes (<em>Crotalus viridis</em>) inhabiting a high-elevation, montane shrubland in northwest Colorado throughout their short summer active season, addressing the thermal consequences of microhabitat selection with a focus on thermoregulation of pregnant females at communal rookery sites. We deployed operative temperature models to collect data on the thermal quality of microhabitats used by the snakes, and calculated thermoregulatory accuracy of the snakes by comparing their field-active body temperatures with preferred body temperatures of snakes placed in a thermal gradient. Pregnant females inhabited rocky, hilltop rookeries that had higher thermal quality due to higher and less variable nighttime temperatures compared to microhabitats in the surrounding prairie. Pregnant females therefore thermoregulated more accurately than non-pregnant females. The difference was most pronounced during the night, when pregnant females at rookeries maintained higher body temperatures than non-pregnant snakes in the prairie. Our results support the hypothesis that one major reason female rattlesnakes at high latitudes and/or high elevations forgo migration and gestate at communal, rocky, hilltop rookeries is that, relative to prairie microhabitats, they provide better conditions for thermoregulation during pregnancy.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141982596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the Omius™ cooling headband effectiveness during a 70-min submaximal running effort followed by a 5-km time-trial in hot/humid conditions","authors":"Antoine Jolicoeur Desroches ,&nbsp;Fedi Aloui ,&nbsp;Thomas A. Deshayes ,&nbsp;Eric D.B. Goulet","doi":"10.1016/j.jtherbio.2024.103964","DOIUrl":"10.1016/j.jtherbio.2024.103964","url":null,"abstract":"<div><p>Exercise performed under hot/humid conditions can hinder endurance performance. The Omius™ headband (OH) is purported to reduce the perception of heat and improve performance. We examined the impact of OH on selected thermal and cardiovascular functions, subjective perceptions and running performance. Using a randomized crossover protocol, 10 trained male athletes (28 ± 4 years) completed two trials (OH and sham headband (SH), 35.0 ± 0.3 °C, 56 ± 3% relative humidity) comprising 70 min of running (60% <span><math><mrow><mover><mi>V</mi><mo>˙</mo></mover></mrow></math></span> O_2max) followed by a 5-km running time-trial (TT). Heart rate, perceived exertion and whole-body thermal comfort did not significantly differ between conditions during the submaximal running effort and TT. Rectal temperature was higher with OH (0.11 ± 0.16 °C, <em>p</em> = 0.052) than SH prior to the submaximal running effort, however, no significant differences were observed between conditions regarding the changes in rectal temperature from baseline during the submaximal running effort and TT. Forehead temperature was significantly lower with OH than SH during the submaximal running effort, but no significant differences were observed at the end of the TT. Scores of perceived forehead thermal comfort was only significantly lower with OH than SH during the submaximal running effort. TT performance did not significantly differ between OH (19.8 ± 1.2 min) and SH (20.2 ± 1.0 min). In conclusion, OH improves forehead thermal comfort and reduces forehead temperature but not rectal temperature, heart rate and perceived exertion during, nor 5-km TT performance following, 70 min of submaximal running in the heat.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142126088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of heat stress on the feeding preference of yellow-feathered broilers and its possible mechanism","authors":"Xiajie Feng ,&nbsp;Ziyuan Ye ,&nbsp;Kailai Xie ,&nbsp;Shuqing Zhu ,&nbsp;Xin Wu ,&nbsp;Zhonghua Sun ,&nbsp;Xiaohua Feng ,&nbsp;Yingfen Mo ,&nbsp;Jingwen Liang ,&nbsp;Gang Shu ,&nbsp;Songbo Wang ,&nbsp;Canjun Zhu ,&nbsp;Qingyan Jiang ,&nbsp;Lina Wang","doi":"10.1016/j.jtherbio.2024.103959","DOIUrl":"10.1016/j.jtherbio.2024.103959","url":null,"abstract":"<div><p>Heat stress is the most critical factor affecting animal feeding in summer. This experiment was conducted to investigate the effects of heat stress on the feeding preference of yellow-feathered broilers and its possible mechanism. As a result, the preference of yellow-feathered broilers for <em>Tenebrio molitor</em> was significantly decreased, and the fear response and serum corticosterone of broilers were significantly increased when the ambient temperatures are 35 °C (<em>P &lt;</em> 0.05). In the central nervous system, consistent with the change in feeding preference, decreased dopamine in the nucleus accumbens (NAc) and increased mRNA levels of MAO-B in the ventral tegmental area (VTA) and NAc were found in yellow-feathered broilers (<em>P &lt;</em> 0.05). In addition, we found significantly increased mRNA levels of corticotropin-releasing hormone receptor 1, corticotropin-releasing hormone receptor 2 and glucocorticoid receptor in the VTA and NAc of female broilers (<em>P &lt;</em> 0.05). However, no similar change was found in male broilers. On the other hand, the serum levels of insulin and glucagon-like peptide-1 were increased only in male broilers (<em>P &lt;</em> 0.05). Accordingly, the mRNA levels of insulin receptor and glucagon-like peptide-1 receptor in the VTA and the phosphorylation of mTOR and PI3K were increased only in male broilers (<em>P &lt;</em> 0.05). In summary, the preference of yellow-feathered broilers for <em>Tenebrio molitor</em> feed decreased under heat stress conditions, and hedonic feeding behavior was significantly inhibited. However, the mechanism by which heat stress affects hedonic feeding behavior may contain gender differences. The insulin signaling pathway may participate in the regulation of heat stress on the male broiler reward system, while stress hormone-related receptors in the midbrain may play an important role in the effect of heat stress on the reward system of female broilers.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142050320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microclimate and thermal refuge influences on sage-grouse brood habitat selection","authors":"Tyler D. Dungannon ,&nbsp;Christopher R. Anthony ,&nbsp;Timothy S. Bowden ,&nbsp;Christian A. Hagen","doi":"10.1016/j.jtherbio.2024.103957","DOIUrl":"10.1016/j.jtherbio.2024.103957","url":null,"abstract":"<div><p>Wildlife space use is driven by three primary mechanisms, predator avoidance, foraging, and thermoregulation. The latter has largely been overlooked in wildlife research. Understanding how habitat use is influenced by thermoregulatory properties is a critical component to depicting species' ecology. Galliformes’ (i.e., ground nesting birds with precocial young) ecology is predisposed to thermal extremes, where newly hatched chicks are unable to thermoregulate &lt;14 d post-hatch, and have limited capabilities until &gt;21 d post-hatch. We examined greater sage-grouse (<em>Centrocercus urophasianus</em>) brood rearing habitats and provide the first evaluation as to how microscale thermal environments influenced habitat selection. We monitored 24 broods, collected 82,929 black bulb temperature measurements from thermal arrays (n = 256) comprised of stainless steel black bulbs (i.e., surrogate for operative temperature) to compare brood morning (i.e., foraging, n = 78), afternoon (i.e., loafing, n = 82) and associated random locations (n = 96) between early (≤21 d post-hatch) and late (&gt;21 d post-hatch) brood-rearing. We measured vegetation at all locations to disentangle relationships between cover and thermoregulatory metrics. We found that microclimates at all foraging locations heated more rapidly than either their loafing or random locations. Alternatively, loafing locations moderated ambient temperature more effectively than foraging locations but were similar to random locations. Broods were using loafing sites that both increased their ability to avoid predators (i.e., increased shrub structure) and buffered ambient temperature better than their foraging locations. Interestingly, random afternoon locations tended to lack concealment from predators, despite these locations showing improved thermal buffering compared to foraging locations. However, early brood-rearing habitats appeared to moderate ambient temperatures more effectively than late. Our results suggested that managing vegetation for structural heterogeneity will afford a diversity of thermal refuge for greater sage-grouse broods during this critical life history stage.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S030645652400175X/pdfft?md5=174b82373e1221d9493e8a4d689995a9&pid=1-s2.0-S030645652400175X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142097705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One size does not fit all: Methodological considerations and recommended solutions for intramuscular temperature assessment","authors":"Patrick Rodrigues ,&nbsp;Lucas B.R. Orssatto ,&nbsp;Anne Hecksteden ,&nbsp;Gabriel S. Trajano ,&nbsp;Geoffrey M. Minett","doi":"10.1016/j.jtherbio.2024.103925","DOIUrl":"10.1016/j.jtherbio.2024.103925","url":null,"abstract":"<div><p>Intramuscular temperature kinetics can provide insightful information for exercise and environmental physiology research. However, currently, there are no consistent method descriptions or guidelines for muscle temperature assessment in the literature. Studies have reported a great variation in muscle temperature assessment, from 1.5 cm under the skin to 4 cm under the muscle fascia. Moreover, a large variation in body composition components among participants exacerbates this issue, changing the depth and the muscle to be tested. For instance, in young adults (25 ± 5 yrs), the thigh subcutaneous fat thickness can vary from 0.11 to 1.69 cm, and vastus lateralis thickness from 1.62 to 3.38 cm; in older adults (68.5 ± 3 yrs), subcutaneous fat thickness plus gastrocnemius medialis thickness can vary from 1.03 to 3.22 cm. This variation results in inconsistent resting muscle temperature profiles and muscle temperature kinetics during and after an exercise or environmental thermal stress interventions (hot or cold). Hence, one fixed size does not fit all. Standardization and consistency in muscle temperature assessment procedures across studies are required to allow a better understanding and translation of the influence of a given stressor (exercise or thermal) on muscle temperature kinetics. This methodological manuscript i) summarizes the differences in muscle temperature assessment procedures and techniques used across different studies, ii) discusses current concerns related to variations in intramuscular needle depth, and subcutaneous fat and muscle thickness when assessing muscle temperature, and iii) suggests a systematic and more robust approach, based on individual body composition characteristics, to be considered when assessing intramuscular temperature.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0306456524001438/pdfft?md5=b892b7881d1981dc48ef280155846521&pid=1-s2.0-S0306456524001438-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142145900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Warm and thermally variable incubation conditions reduce embryonic performance and carry over to influence hatchling tradeoffs","authors":"Z.R. Stahlschmidt","doi":"10.1016/j.jtherbio.2024.103946","DOIUrl":"10.1016/j.jtherbio.2024.103946","url":null,"abstract":"<div><p>Animals' thermal sensitivities have long been characterized by thermal performance curves (TPCs) or reaction norms, and TPCs may predict animals’ responses to climate change. Typically, TPCs are parameterized by measuring performance at a range of constant temperatures. Yet, animals encounter a range of thermal environments, and temperature variability is an aspect of climate change that may affect animals more than gradual warming. Daily temperature variability is particularly important for eggs in most taxa because they are highly sensitive to temperature and cannot behaviorally avoid stressful temperatures. Thus, the legacy of thermal conditions experienced during incubation may carryover to subsequent life stages. Here, I factorially manipulated mean temperature (20, 25, or 30 °C) and daily temperature range (DTR; ±0, 5, or 10 °C) during incubation for eggs of the variable field cricket (<em>Gryllus lineaticeps</em>) to integrate the role of DTR into the established paradigm of TPCs. Low DTR (±5 °C) was not generally costly, and it even improved hatchling starvation resistance (<em>sensu</em> hormesis). However, high DTR (±10 °C) reduced and delayed hatching at a warm mean temperature (30 °C). The effects of high DTR carried over to accelerate hatchling development at an expense to hatchling starvation resistance—therefore, thermal conditions during incubation can shape tradeoffs among important traits related to life history and stress tolerance later in life. In sum, animals may exhibit complex responses to their increasingly warmer, more thermally variable environments.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0306456524001645/pdfft?md5=5df562972a68d7c40059647405e6a978&pid=1-s2.0-S0306456524001645-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Mitigating heat effects in the workplace with a ventilation jacket: Simulations of the whole-body and local human thermophysiological response with a sweating thermal manikin in a warm-dry environment” [Volume 119, January 2024, 103772]","authors":"Simona Del Ferraro ,&nbsp;Tiziana Falcone ,&nbsp;Marco Morabito ,&nbsp;Michela Bonafede ,&nbsp;Alessandro Marinaccio ,&nbsp;Chuansi Gao ,&nbsp;Vincenzo Molinaro","doi":"10.1016/j.jtherbio.2024.103973","DOIUrl":"10.1016/j.jtherbio.2024.103973","url":null,"abstract":"","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0306456524001918/pdfft?md5=59112bae2ac5e56dac83792bc8871f6d&pid=1-s2.0-S0306456524001918-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heat hardening improves thermal tolerance in abalone, without the trade-offs associated with chronic heat exposure","authors":"Ahmed S.A. Abbas ,&nbsp;Michael Collins ,&nbsp;Robert Ellis ,&nbsp;John I. Spicer ,&nbsp;Manuela Truebano","doi":"10.1016/j.jtherbio.2024.103963","DOIUrl":"10.1016/j.jtherbio.2024.103963","url":null,"abstract":"<div><p>Marine animals are challenged by chronically raised temperatures alongside an increased frequency of discrete, severe warming events. Exposure to repeated heat shocks could result in heat hardening, where sub-lethal exposure to thermal stress temporarily enhances thermotolerance, and may be an important mechanism by which marine species will cope with future thermal challenges. However, we have relatively little understanding of the effects of heat hardening in comparison to chronic exposure to elevated temperatures. Therefore, we compared the effects of heat hardening from repeated exposure to acute heat shocks and chronic exposure to elevated temperatures on thermal tolerance in the European abalone, <em>Haliotis tuberculata.</em> Adult abalones were exposed to either control temperature (15 °C), chronic warming (20 °C) or a regime of two events of repeated acute heat shock cycles (23–25 °C) during six months, and their thermal tolerance and performance, based upon cardiac activity, compared using a dynamic ramping assay. The cost associated with each treatment was also estimated <em>via</em> measurements of condition index (CI). Abalone exposed to both temperature treatments had higher upper thermal limits than the control, but heat-hardened individuals had significantly higher CI values, indicating an enhancement in condition status. Differences in the shape of the thermal performance curve suggest different mechanisms may be at play under different temperature exposure treatments. We conclude that heat hardening can boost thermal tolerance in this species, without performance trade-offs associated with chronic warming.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0306456524001815/pdfft?md5=e2fc43bc126e16941408e9680e252ef8&pid=1-s2.0-S0306456524001815-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142097817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of increased pre-start diet density on broiler chick behavior, corticosterone levels, and performance responses under cold stress during early life","authors":"Mariana Diniz Costa Vasconcelos ,&nbsp;Lorena Salim Sousa ,&nbsp;Tainá Silva Brandão Lopes ,&nbsp;Larissa Moreira Gonçalves ,&nbsp;Aline Bernardes de Souza ,&nbsp;Nathália Morais Avelar ,&nbsp;Júlia Macedo Fernandes Oliveira ,&nbsp;Fabíola de Oliveira Paes Leme ,&nbsp;Leonardo José Camargos Lara ,&nbsp;Itallo Conrado Sousa Araújo","doi":"10.1016/j.jtherbio.2024.103974","DOIUrl":"10.1016/j.jtherbio.2024.103974","url":null,"abstract":"<div><p>This study assessed the effects of increased pre-start diet density on the metabolism, crop filling, and overall performance of broilers under cold stress during their initial 14 days of life. Using 576 one-day-old Cobb500 male chicks from 27-week-old breeders, the experiment employed a 2 × 2 arrangement, varying thermal conditions (thermoneutrality or cold stress at 18 °C for 8 h) and pre-start diet composition (21.5% crude protein, 2970 kcal/kg or 22.5%, 3050 kcal/kg). The cold stress group exhibited lower cloacal temperature and decreased crop filling rate during the first two days (P &lt; 0.05). Chick behavior was significantly affected at 1 and 5 days (P &lt; 0.05), and corticosterone levels in serum were higher for the cold stress group at 7 days (P &lt; 0.05). Feed intake at 7 days was lower in the high-density feed group (P &lt; 0.05). No significant interactions were observed for feed intake, body weight gain, or feed conversion ratio at 7 and 35 days (P &gt; 0.05). Cold stress resulted in performance losses, impacting feed conversion and the Productive Efficiency Index. The dense diet influenced performance only within the first week, with subsequent diets showing no effect, suggesting dietary manipulation alone was insufficient to mitigate cold stress-induced losses.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142232294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How do outside-hosts-overwintering parasitoids, at the adult stage, cope with cold?","authors":"Marie D'Ottavio ,&nbsp;Geneviève Labrie ,&nbsp;Eric Lucas","doi":"10.1016/j.jtherbio.2024.103940","DOIUrl":"10.1016/j.jtherbio.2024.103940","url":null,"abstract":"<div><h3>Introduction</h3><p>When overwintering, most endoparasitoids are protected from the cold inside their hosts. However, some endoparasitoids, along with ectoparasitoids, fall into the category called outside-hosts-overwintering parasitoids (OHOP) at immature or adult stages. We compared the cold-hardiness capacity and strategy between adult OHOP and their hosts (HOST) by examining their supercooling points (SCP), with acclimation periods and acclimation temperatures, and their lower lethal temperatures at 50% mortality (LLT50). We hypothesized that OHOP are more cold-hardy than their HOST, with lower SCP and LLT50.</p></div><div><h3>Materials and methods</h3><p>Throughout the summers of 2020, 2021, and 2022, adult cabbage seedpod weevils (HOST) were sampled with a sweep net at the canola pod stage, and thousands of pods were collected and placed in emergence boxes to retrieve the adult OHOP <em>Trichomalus perfectus</em>. Regarding SCP measures, OHOP and HOST were separated according to various treatments. Each treatment considered a target exposure temperature (5, 10, or 20 °C) or a target exposure period (5, 15 or 25 days) at 5 °C. Regarding LLT measures, OHOP and HOST were categorized into five treatments, each corresponding to a specific exposure temperature (−5, −10, −15, −20 or −25 °C).</p></div><div><h3>Results and conclusion</h3><p>Acclimations to a lower temperature (5 °C) and a longer period (25 days) led to a significantly lower SCP of OHOP than HOST. Regarding OHOP, the average SCP was −19.71 °C when the acclimation temperature was 20 °C and significantly decreased to −23.20 °C when it was 5 °C. The average SCP was −18.82 °C when the acclimation period was five days and significantly decreased to −23.20 °C when it was 25 days. Conversely, the average SCP for HOST was never below −20 °C. At 20 °C acclimation temperature, HOST exhibited a significantly higher SCP of −14.64 °C compared to acclimations at 5 °C (−19.19 °C) and 10 °C (−20.00 °C), but there were no significant differences between 5 and 10 °C nor between acclimation periods. Therefore, the adult OHOP is more cold-hardy than its HOST. OHOP also exhibited a lower LLT50 than HOST, with −19.20 °C <em>versus</em> −17.59 °C. Finally, OHOP and HOST employ the same freeze-avoidance strategy, as evidenced by their SCP values (−19.57 °C <em>versus</em> −16.80 °C) which closely align with their respective LLT50. Adult OHOP better survive winter than their HOST in cold environments.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S030645652400158X/pdfft?md5=6a447b7695cd0399fc9443f484cfbeb5&pid=1-s2.0-S030645652400158X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141988273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}