Journal of Experimental Biology最新文献_第2页

Colour preference and foraging constancy in the Asian giant honey bee Apis dorsata. 亚洲大蜜蜂的颜色偏好和觅食恒常性。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 DOI: 10.1242/jeb.252021

R Sudeep, Sachin Bhaskar, Hema Somanathan

{"title":"Colour preference and foraging constancy in the Asian giant honey bee Apis dorsata.","authors":"R Sudeep, Sachin Bhaskar, Hema Somanathan","doi":"10.1242/jeb.252021","DOIUrl":"https://doi.org/10.1242/jeb.252021","url":null,"abstract":"Tropical pollinators forage in spatiotemporally variable environments requiring flexible strategies that remain understudied in the tropics. Floral constancy - the temporary restriction to a single flower type - influences foraging success and plant-pollinator interactions. We examined colour preferences and constancy in wild colonies of the Asian giant honeybee, Apis dorsata, testing how reward concentration and learning shape these behaviours and whether the spectral composition of the floral community correlates with bee colour preferences. Using blue-yellow dimorphic artificial flower arrays, we tested whether: (1) reward quality modulates spontaneous colour preference and constancy, with low-reward promoting reliance on spontaneous biases and high-reward promoting exploratory choices; (2) recent experience modifies these biases, and (3) the floral community colour composition corresponds with bee preferences. Bees trained to a neutral UV-grey stimulus were expected to revert to their spontaneously preferred colour. Bees showed strong preference for and high constancy to blue. This short-wavelength bias was strongest under low-reward and weakened at high-reward concentrations, demonstrating reward-dependent shifts in behaviour. We propose reward concentration modulates arousal, with low-reward favouring spontaneous preferences and high-reward promoting exploratory sampling. Bees readily learned to prefer yellow with training, and sequential exposure to both colours eliminated overall preference, indicating that recent experience disrupts constancy. The community was dominated by short-wavelength flowers, consistent with possible pollinator-mediated selection linked to the blue preference in A. dorsata. Overall, colour preferences in Apis dorsata are flexible, shaped by reward quality and recent experience, with key consequences for floral constancy and plant-pollinator interactions.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816122","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}

引用次数: 0

Vocal compensation to noise in long-finned pilot whales (Globicephala melas). 长鳍领航鲸对噪音的声音补偿。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 Epub Date: 2026-05-07 DOI: 10.1242/jeb.251217

Milou Hegeman, Nicholas B W Macfarlane, Philippe Verborgh, Pauline Gauffier, Ruth Esteban, Renaud de Stephanis, Peter L Tyack, Frants H Jensen

{"title":"Vocal compensation to noise in long-finned pilot whales (Globicephala melas).","authors":"Milou Hegeman, Nicholas B W Macfarlane, Philippe Verborgh, Pauline Gauffier, Ruth Esteban, Renaud de Stephanis, Peter L Tyack, Frants H Jensen","doi":"10.1242/jeb.251217","DOIUrl":"https://doi.org/10.1242/jeb.251217","url":null,"abstract":"Anthropogenic noise is considered a marine pollutant by the European Union and can impact marine animals in various ways. Noise that overlaps in time and frequency with animal communication signals can interfere with communication and thus impact ecological functions mediated by acoustic signals, depending on how animals compensate for increasing noise. Our study investigated Lombard responses in long-finned pilot whales using sound and movement recording tags in an area with high anthropogenic pressure, the Strait of Gibraltar. We tested if pilot whales increase their vocal amplitude in response to noise, and whether vocal compensation is signal or context specific. We analyzed 1336 calls from 18 individuals in small social groups of simultaneously tagged animals, allowing us to parse which individual emitted which call and how call output level depended on masking noise level. We found that pilot whales increase their call output level with 0.50±0.04 dB per 1 dB increase in noise level to partially compensate for the effects of masking noise. Call type significantly influenced the Lombard response magnitude, with vocal compensation ranging from 0.11 to 0.87 dB per 1 dB increase in noise level, whereas animals exhibited similar Lombard responses for different dive contexts (non-foraging, deep dive descent and ascent). Our results indicate that pilot whales only compensate partially for increased noise levels, and that Lombard response magnitude depends on signal type. This emphasizes the need for understanding the ecological consequences of communication disruptions to ensure sustainable management of human activities.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":"229 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147838881","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}

引用次数: 0

Increased heart rate and blood oxygen extraction are key to the ability of schoolmaster snapper (Lutjanus apodus) to swim maximally at high temperatures. 加快心率和血氧提取是鲷鱼（Lutjanus apodus）在高温下最大限度游泳能力的关键。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 Epub Date: 2026-05-08 DOI: 10.1242/jeb.252059

Fiona P H Durnford, Emma S Porter, Anthony K Gamperl

{"title":"Increased heart rate and blood oxygen extraction are key to the ability of schoolmaster snapper (Lutjanus apodus) to swim maximally at high temperatures.","authors":"Fiona P H Durnford, Emma S Porter, Anthony K Gamperl","doi":"10.1242/jeb.252059","DOIUrl":"10.1242/jeb.252059","url":null,"abstract":"Consistent with data on other tropical fish species: we previously showed that schoolmaster snapper (Lutjanus apodus) exhibited a maximum metabolic rate (MMR) during a critical thermal maximum while swimming (CTSMax) test that was 60% higher than during a standard critical thermal maximum (CTMax) test; and based on this data suggested that this elevated MMR contributed to swimming fish fatiguing at a temperature only 1.4°C lower than their CTMax (37.5 versus 38.9°C, respectively). However, the mechanism(s) underlying the greater MMR and realistic aerobic scope (ASR) in fish given a CTSMax test remained unclear. To answer this question, CTMax, Ucrit (critical swimming speed) and CTSMax tests were performed on snapper surgically implanted with Transonic® blood flow probes, and we measured heart rate (fH), stroke volume (SV), cardiac output (Q̇), oxygen consumption (ṀO2) and blood oxygen extraction (EO2; ṀO2/Q̇). The ∼1.75-fold higher MMR observed snapper when given CTSmax versus CTmax tests was not explained by a greater contribution of SV to Q̇. Instead, the higher MMR was primarily driven by a ∼40 beat min-1 (25%) higher maximum fH and a ∼1.55-fold greater increase in EO2. This elevated EO2 may reflect enhanced oxygen uptake at the gills (i.e. higher arterial oxygen content) due to the fish engaging in ram ventilation while swimming at elevated temperatures and/or improved blood oxygen extraction. These findings highlight the critical role of EO2 in setting tolerance limits under combined thermal and activity-related stressors, and caution against relying solely on fH variables (i.e. fH,Max) as an indicator of thermal tolerance.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147503936","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}

引用次数: 0

Aerial hawking in a gleaning specialist bat (Trachops cirrhosus) does not involve a high-resolution buzz. 拾取食物的专业蝙蝠（Trachops肝硬化）的空中鸣叫不涉及高分辨率的嗡嗡声。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 Epub Date: 2026-05-06 DOI: 10.1242/jeb.252199

Sebastian A Mortensen, A Leonie Baier, Michael B Pedersen, Kristian Beedholm, Rachel A Page, Peter T Madsen, Laura Stidsholt

引用次数: 0

A morphological innovation, the fan of the water strider Rhagovelia, enables its conquest of turbulent streams. 一种形态上的创新，水黾的扇形，使它能够征服汹涌的溪流。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 Epub Date: 2026-05-08 DOI: 10.1242/jeb.250734

Thomas Steinmann, Miguel Piñeirua, Mourad Jaffar-Bandjee, Camille Blet, Antoine Bour, Abderrahman Khila, Jérôme Casas

{"title":"A morphological innovation, the fan of the water strider Rhagovelia, enables its conquest of turbulent streams.","authors":"Thomas Steinmann, Miguel Piñeirua, Mourad Jaffar-Bandjee, Camille Blet, Antoine Bour, Abderrahman Khila, Jérôme Casas","doi":"10.1242/jeb.250734","DOIUrl":"10.1242/jeb.250734","url":null,"abstract":"Maneuvering on fast running waters is an energy demanding task, making this niche hard to access. The propelling fan of the water strider Rhagovelia is an evolutionary innovation that enhances the maneuverability in these environments. This structure consisting of 20 lamellate branches, each with thinner secondary branches, offers a unique model to understand the tenuous link between morphological innovations and adaptation to new ecological environments. However, the principles of enhanced thrust, i.e. the magnitude of the force transfer between the fan and the fluid, is not understood. We characterized the kinematics of the fan and body of Rhagovelia during the propulsion phase. A simplified mechanical model that replicates the movement of the fan was used in both experiments and fluid dynamic computations. Using particle image velocimetry, we measured the flow velocity field around it and determined the magnitude of forces using a load cell. Finally, we used computational fluid dynamics to resolve the flow around a numerical fan replicate of similar morphology. The computations, once validated by their comparison with experimental results using similitude principles, allowed us to determine the nature of the forces acting on the fan. A large part of the fan's resistive force is due to viscous shear stress. The 75% porosity lamellate fan functions as a leaky paddle, while producing 80% of the hydrodynamic drag force of an equivalent membrane oar. The thrust enables the strider to colonize most streams, expanding its niche by a factor of four to five.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147581498","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}

引用次数: 0

Linking morphology and performance: skeletal growth and sex-specific form-function relationships in an agamid lizard. 链接形态和性能：骨骼生长和性别特异性形态-功能关系的蜥蜴。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 Epub Date: 2026-05-08 DOI: 10.1242/jeb.251931

Subhasmita Patro, Aditya Moger, Lipsa Dash, Madhusmita Behera, Maria Thaker

{"title":"Linking morphology and performance: skeletal growth and sex-specific form-function relationships in an agamid lizard.","authors":"Subhasmita Patro, Aditya Moger, Lipsa Dash, Madhusmita Behera, Maria Thaker","doi":"10.1242/jeb.251931","DOIUrl":"10.1242/jeb.251931","url":null,"abstract":"Linking morphology to performance is essential for understanding how skeletal growth shapes functional capabilities. In sexually dimorphic species, males and females often experience distinct selection pressures, leading to differences in growth rate, allometric patterns and adult performance. Using longitudinal X-ray imaging, we quantified skeletal growth in the agamid lizard, Psammophilus dorsalis, from juvenile to adult stages, to examine sex differences in growth trajectories, allometric patterns, whole-body performance and morphology-performance relationships. We found that body length increased non-linearly in both sexes and growth trajectories were parallel. Key morphological traits scaled isometrically relative to body length. As adults, sexes did not differ in absolute sprint speed, but males had higher absolute bite force. Hindlimb length and body shape poorly predicted sprint speed, but head length predicted bite force in females. Overall, our results suggest broadly similar growth patterns and performance outcomes in both sexes, indicating possible constraints on morphology and performance.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147674208","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}

引用次数: 0

Precocial parasympathetic-mediated cardiac regulation in embryonic gulf killifish (Fundulus grandis). 胚胎湾鳉鱼（大底）的早熟副交感神经介导的心脏调节。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 Epub Date: 2026-04-30 DOI: 10.1242/jeb.251772

Steven L Williams, Benjamin Dubansky, Jack Eudy, Brandon Chow, Katelin Ratcliff, Warren W Burggren

{"title":"Precocial parasympathetic-mediated cardiac regulation in embryonic gulf killifish (Fundulus grandis).","authors":"Steven L Williams, Benjamin Dubansky, Jack Eudy, Brandon Chow, Katelin Ratcliff, Warren W Burggren","doi":"10.1242/jeb.251772","DOIUrl":"10.1242/jeb.251772","url":null,"abstract":"Embryonic fishes provide valuable models for understanding the ontogeny of vertebrate cardiovascular regulation, yet the timing of autonomic control onset varies widely among species. In most teleosts, it is generally accepted that parasympathetic (vagal) influence over heart rate arises only near hatching, but historical observations suggest that killifishes deviate from this paradigm. Here, we characterized the development of vagal control in Gulf killifish (Fundulus grandis), a precocial species with an extended embryonic period. Using both direct mechanical and indirect vibrational startle stimuli, combined with atropine treatment, we identified two distinct cardiac response phenotypes: (1) a transient atrial and ventricular arrest evident by 70% of embryonic development, and (2) a later-developing transient bradycardia beginning at 80%. Both responses were abolished by atropine, confirming parasympathetic mediation, and neither habituated to repeated stimulation. These findings demonstrate that F. grandis embryos acquire functional vagal tone well before hatching, contrasting with the delayed autonomic development typical of most vertebrates. Thus, we expand upon early observations from nearly a century-old study, establishing the Gulf killifish as a tractable model for investigating the developmental physiology of early autonomic control in vertebrates.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147581501","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}

引用次数: 0

Sex and age shape mitochondrial function in a long-lived seabird. 性别和年龄决定了长寿海鸟的线粒体功能。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 Epub Date: 2026-04-30 DOI: 10.1242/jeb.251568

Matteo Beccardi, Justine Bertram, Sandra Bouwhuis, Nathalie Kürten, Andreas Nord, Oscar Vedder, Pablo Salmón

{"title":"Sex and age shape mitochondrial function in a long-lived seabird.","authors":"Matteo Beccardi, Justine Bertram, Sandra Bouwhuis, Nathalie Kürten, Andreas Nord, Oscar Vedder, Pablo Salmón","doi":"10.1242/jeb.251568","DOIUrl":"10.1242/jeb.251568","url":null,"abstract":"Ageing refers to a decline in individual performance with increasing age that ultimately leads to a reduction in organismal fitness. Although the physiological causes of ageing are likely to be diverse, a decrease in mitochondrial function may play a central role, as mitochondria generate over 90% of the energy used by eukaryotic cells. Despite support from human and laboratory studies, the effect of age on mitochondrial function, and the extent to which it may differ between males and females, has largely remained unexplored in wild populations. As such, we investigated mitochondrial respiratory function in a long-lived seabird, the common tern (Sterna hirundo), sampling 161 breeding individuals of known sex and ranging in age from 2 to 24 years. We found that older birds showed reduced maximum electron transport system activity and proton leak, suggesting an age-related decline in mitochondrial capacity. Mitochondrial efficiency in ATP production, however, increased with age, suggesting it to be a potential marker of individual quality and survival. Mitochondrial efficiency, as well as spare respiratory capacity, also showed the highest level of individual repeatability between years, indicating consistent individual differences. Although sex differences in age-related trends were not evident, females exhibited significantly higher mitochondrial respiration, potentially due to the energetic demands of egg laying. Overall, these results contribute to our understanding of the role of mitochondrial respiratory function as one of the physiological mechanisms underlying individual performance and ageing in wild animals.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147521106","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}

引用次数: 0

Gut yeasts accelerate chill coma recovery in Drosophila melanogaster. 肠道酵母加速黑腹果蝇冷昏迷恢复。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-05-01 Epub Date: 2026-05-05 DOI: 10.1242/jeb.251533

Yanira Jiménez-Padilla, Brent J Sinclair

{"title":"Gut yeasts accelerate chill coma recovery in Drosophila melanogaster.","authors":"Yanira Jiménez-Padilla, Brent J Sinclair","doi":"10.1242/jeb.251533","DOIUrl":"10.1242/jeb.251533","url":null,"abstract":"The role of microbial symbionts in host stress tolerance remains underexplored. Gut microbiome studies in Drosophila melanogaster have largely focused on bacteria, whereas yeasts have been assumed to provide nutrition rather than engage in true symbiosis. We explored the effect of gut yeasts on chill coma recovery time (CCRT, a proxy for cold tolerance) and its yeast species-specificity and dependence on live yeast cells. We generated flies with distinct gut microbiota conditions: axenic (microbe-free), with their native microbiota (derived from the microbes associated with flies conventionally reared in our colony), or gnotobiotic flies mono-associated with either live or heat-killed yeasts (Saccharomyces cerevisiae, not normally associated with Drosophila guts, and three species previously isolated from wild flies: Lachancea kluyveri, Pichia kluyveri and P. nakasei). We quantified yeast abundance, sex differences in yeast ingestion, and measured CCRT after exposure to 0°C for 8 h. Female axenic flies recovered 42% more slowly than those with their native microbiota, but this delay was fully rescued by live L. kluyveri, P. kluyveri or P. nakasei, not by S. cerevisiae or dead yeasts. The effect was rapid (occurred within 48 h), sex-specific (restricted to females) and appeared to be dose-dependent. We also confirmed that yeasts in the gut are alive, facilitating a true (albeit transient) symbiotic interaction. Our findings show that yeast symbionts may contribute to natural variation in thermal tolerance and may broadly impact host phenotypes. Excluding yeasts or assuming a solely nutritional role risks overlooking key symbiotic interactions that have profound functional consequences.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147521111","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}

引用次数: 0

Metabolic acclimation to captivity in highveld mole-rats (Cryptomys hottentotus pretoriae) is driven by sex-specific body mass increases. 高原鼹鼠（Cryptomys hottentotus pretoriae）对圈养的代谢适应是由性别特异性体重增加驱动的。

IF 2.6 2区生物学

Journal of Experimental Biology Pub Date : 2026-04-30 DOI: 10.1242/jeb.252449

Jack E Thirkell, Nigel C Bennett, Daniel W Hart, Chris G Faulkes, Monica A Daley, Craig R White, Steven J Portugal

{"title":"Metabolic acclimation to captivity in highveld mole-rats (Cryptomys hottentotus pretoriae) is driven by sex-specific body mass increases.","authors":"Jack E Thirkell, Nigel C Bennett, Daniel W Hart, Chris G Faulkes, Monica A Daley, Craig R White, Steven J Portugal","doi":"10.1242/jeb.252449","DOIUrl":"https://doi.org/10.1242/jeb.252449","url":null,"abstract":"Captivity represents a profound environmental shift that can induce physiological acclimation, yet its effects on metabolic rate remain poorly resolved, particularly in subterranean mammals. African mole-rats (Bathyergidae) are frequently studied under captive conditions, despite wide variation in acclimation periods prior to metabolic assessment. Here, we tested whether prolonged captivity alters resting metabolic rate (RMR) and related physiological traits in the highveld mole-rat Cryptomys hottentotus pretoriae, and whether such changes are associated with body mass and sex. Using open-flow respirometry, we measured RMR, mass-specific RMR (msRMR) and respiratory quotient (RQ) in the same population of wild-caught animals assessed 7 days post-capture (wild) and again after 12 months in captivity (captive). Whole-animal RMR did not differ between wild and captive groups, nor between sexes. However, msRMR was 26.1% lower following captivity, coincident with a 28.1% increase in mean body mass. This mass gain was strongly sex-specific: males increased body mass by 52.4%, whereas females showed no significant change. Despite this, sex did not independently explain variation in RMR or msRMR. Captive animals also exhibited lower RQ values than recently captured individuals, suggesting shifts in substrate utilisation or energetic state. Together, these results indicate that apparent reductions in msRMR following captivity are driven primarily by increases in metabolically inactive tissue rather than suppression of whole-animal metabolic rate. Our findings highlight the importance of accounting for captivity-induced changes in body mass and composition when interpreting metabolic data, and caution against direct comparisons between unacclimated and long-term captive animals.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147773048","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}

引用次数: 0