Journal of Experimental Biology最新文献_第10页

Hyperoxia disproportionally benefits the aerobic performance of large fish at elevated temperature. 在温度升高的情况下，高氧对大型鱼类的有氧性能有不成比例的好处。

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-10-01 Epub Date: 2024-10-04 DOI: 10.1242/jeb.247887

Luis L Kuchenmüller, Elizabeth C Hoots, Timothy D Clark

{"title":"Hyperoxia disproportionally benefits the aerobic performance of large fish at elevated temperature.","authors":"Luis L Kuchenmüller, Elizabeth C Hoots, Timothy D Clark","doi":"10.1242/jeb.247887","DOIUrl":"10.1242/jeb.247887","url":null,"abstract":"Increasing evidence shows that larger fish are more vulnerable to acute warming than smaller individuals of the same species. This size-dependency of thermal tolerance has been ascribed to differences in aerobic performance, largely owing to a decline in oxygen supply relative to demand. To shed light on these ideas, we examined metabolic allometry in 130 rainbow trout ranging from 12 to 358 g under control conditions (17°C) and in response to acute heating (to 25°C), with and without supplemental oxygen (100% versus 150% air saturation). Under normoxia, high temperature caused an average 17% reduction in aerobic scope compared with 17°C. Aerobic performance disproportionally deteriorated in bigger fish as the scaling exponent (b) for aerobic scope declined from b=0.87 at 17°C to b=0.74 at 25°C. Hyperoxia increased maximum metabolic rate and aerobic scope at both temperatures and disproportionally benefited larger fish at 25°C as the scaling exponent for aerobic scope was reestablished to the same level as at 17°C (b=0.86). This suggests that hyperoxia may provide metabolic refuge for larger individuals, allowing them to sustain aerobic activities when facing acute warming. Notably, the elevated aerobic capacity afforded by hyperoxia did not appear to improve thermal resilience, as mortality in 25°C hyperoxia (13.8%, n=4) was similar to that in normoxia (12.1%, n=4), although we caution that this topic warrants more targeted research. We highlight the need for mechanistic investigations of the oxygen transport system to determine the consequences of differential metabolic scaling across temperature in a climate warming context.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142132928","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

Do seabirds dream of artificial lights? Understanding light preferences of Procellariiformes. 海鸟会梦见人造灯光吗？了解海鸟对光线的偏好

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-10-01 Epub Date: 2024-10-10 DOI: 10.1242/jeb.247665

Elizabeth Atchoi, Mindaugas Mitkus, Biana Machado, Valter Medeiros, Sofia Garcia, Manuela Juliano, Joël Bried, Airam Rodríguez

{"title":"Do seabirds dream of artificial lights? Understanding light preferences of Procellariiformes.","authors":"Elizabeth Atchoi, Mindaugas Mitkus, Biana Machado, Valter Medeiros, Sofia Garcia, Manuela Juliano, Joël Bried, Airam Rodríguez","doi":"10.1242/jeb.247665","DOIUrl":"10.1242/jeb.247665","url":null,"abstract":"Seabirds, and particularly fledglings of burrow-nesting species, are greatly impacted by light pollution. During their inaugural flights from colony to sea, fledglings become grounded after encountering artificial light. Such groundings, or fallout events, affect many fledglings each year, causing mass mortality events. To mitigate this light-induced mortality, rescue programmes have been implemented for decades at many locations worldwide. Despite the notoriety of fallouts and their conservation implications, the contributing behavioural and biological factors remain mostly unknown. How the mechanisms of light attraction and light avoidance interact and how they manifest in different groups (e.g. age, personality, populations) or light pollution levels remain open questions. We tested behavioural choices of Cory's shearwater Calonectris borealis fledglings, rescued after being grounded in urban areas, and choices of breeding adults for contrasting light sources. Fledglings and adults were exposed to one of three treatments in an experimental Y-maze set-up: white light versus no light, blue versus red light, and a control with no light on each arm of the Y-maze. Both age groups clearly chose the no-light arms and the red light arm. This choice for longer wavelengths and darker environments, along with slower responses by fledglings, suggests that close range artificial light causes disorientation in seabirds. Our study helps to clarify the behavioural components of fallouts and provides further evidence on the disruptive effects of nocturnal artificial light on sensitive species like Procellariiformes.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142347998","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

Reconsidering assumptions in the analysis of muscle fibre cross-sectional area. 重新考虑肌肉纤维横截面积分析中的假设。

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-10-01 Epub Date: 2024-10-10 DOI: 10.1242/jeb.248187

Abel Mebrahtu, Ian C Smith, Shuyue Liu, Ziad Abusara, Timothy R Leonard, Venus Joumaa, Walter Herzog

引用次数: 0

Plunge-diving into dynamic body acceleration and energy expenditure in the Peruvian booby. 秘鲁鲣鸟的动态身体加速度和能量消耗。

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-09-27 DOI: 10.1242/jeb.249555

van Oordt Francis, Jaime Silva, Allison Patterson, Kyle H Elliott

{"title":"Plunge-diving into dynamic body acceleration and energy expenditure in the Peruvian booby.","authors":"van Oordt Francis, Jaime Silva, Allison Patterson, Kyle H Elliott","doi":"10.1242/jeb.249555","DOIUrl":"https://doi.org/10.1242/jeb.249555","url":null,"abstract":"Daily energy expenditure (DEE) is the result of decisions on how to allocate time among activities (resting, commuting, and foraging) and the energy costs of those activities. Dynamic body acceleration (DBA), which measures acceleration associated with movement, can be used to estimate DEE. Previous studies of DBA-DEE correlations in birds occurred on species foraging below their thermoneutral zone, potentially decoupling the DBA-DEE relationship. We used doubly-labelled water (DLW) to validate the use of DBA on plunge-diving seabirds, Peruvian boobies (Sula variegata), foraging in waters above their thermoneutral zone (>19 °C). Mass-specific DEEDLW in boobies was 1.12 kJ/d/g, and higher in males than in females. DBA alone provided the best fitting model to estimate mass-specific DEEDLW compared to models partitioned per activity and time-budget models. Nonetheless, the model parametrizing activity at and away of their onshore breeding colony was the most parsimonious model (r=0.6). This r value, although high, is lower than all other avian studies, implying that temperature is not the main cause of DBA-DEE decoupling in birds. Time at the colony (∼80% of the day) was the largest contributor to DEE as it was the most time-consuming activity and involved nest defense. However, foraging was the most power-consuming activity (4.6 times higher activity-specific metabolic rate than resting at the colony), and commuting-flight was higher than in other gliding seabirds. In short, DBA alone can act as a proxy for DEE, opening avenues to measure the conservation energetics of this seabird in the rapidly-changing Peruvian Humboldt Current System.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348003","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

Light sensitivity of the circadian system in the social Highveld mole-rat Cryptomys hottentotus pretoriae. 社会性高纬度鼹鼠（Cryptomys hottentotus pretoriae）昼夜节律系统的光敏感性。

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-09-15 Epub Date: 2024-09-24 DOI: 10.1242/jeb.247793

Pauline N C Chanel, Nigel C Bennett, Maria K Oosthuizen

{"title":"Light sensitivity of the circadian system in the social Highveld mole-rat Cryptomys hottentotus pretoriae.","authors":"Pauline N C Chanel, Nigel C Bennett, Maria K Oosthuizen","doi":"10.1242/jeb.247793","DOIUrl":"10.1242/jeb.247793","url":null,"abstract":"Highveld mole-rats (Cryptomys hottentotus pretoriae) are social rodents that inhabit networks of subterranean tunnels. In their natural environment, they are rarely exposed to light, and consequently their visual systems have regressed over evolutionary time. However, in the laboratory they display nocturnal activity, suggesting that they are sensitive to changes in ambient illumination. We examined the robustness of the Highveld mole-rat circadian system by assessing its locomotor activity under decreasing light intensities. Mole-rats were subjected to seven consecutive light cycles commencing with a control cycle (overhead fluorescent lighting at 150 lx), followed by decreasing LED lighting (500, 300, 100, 10 and 1 lx) on a 12 h light:12 h dark (L:D) photoperiod and finally a constant darkness (DD) cycle. Mole-rats displayed nocturnal activity under the whole range of experimental lighting conditions, with a distinct spike in activity at the end of the dark phase in all cycles. The mole-rats were least active during the control cycle under fluorescent light, locomotor activity increased steadily with decreasing LED light intensities, and the highest activity was exhibited when the light was completely removed. In constant darkness, mole-rats displayed free-running rhythms with periods (τ) ranging from 23.77 to 24.38 h, but was overall very close to 24 h at 24.07 h. Our findings confirm that the Highveld mole-rat has a higher threshold for light compared with aboveground dwelling rodents, which is congruent with previous neurological findings, and has implications for behavioural rhythms.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11449439/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142107967","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}

引用次数: 0

The functional role of the rabbit digastric muscle during mastication. 兔咀嚼时掘出肌的功能作用

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-09-15 Epub Date: 2024-09-19 DOI: 10.1242/jeb.249238

Roger W P Kissane, Karl T Bates, Michael J Fagan, Linjie Wang, Peter J Watson, Graham N Askew

{"title":"The functional role of the rabbit digastric muscle during mastication.","authors":"Roger W P Kissane, Karl T Bates, Michael J Fagan, Linjie Wang, Peter J Watson, Graham N Askew","doi":"10.1242/jeb.249238","DOIUrl":"10.1242/jeb.249238","url":null,"abstract":"Muscle spindle abundance is highly variable in vertebrates, but the functional determinants of this variation are unclear. Recent work has shown that human leg muscles with the lowest abundance of muscle spindles primarily function to lengthen and absorb energy, while muscles with a greater spindle abundance perform active-stretch-shorten cycles with no net work, suggesting that muscle spindle abundance may be underpinned by muscle function. Compared with other mammalian muscles, the digastric muscle contains the lowest abundance of muscle spindles and, therefore, might be expected to generate substantial negative work. However, it is widely hypothesised that as a jaw-opener (anatomically) the digastric muscle would primarily function to depress the jaw, and consequently do positive work. Through a combination of X-ray reconstruction of moving morphology (XROMM), electromyography and fluoromicrometry, we characterised the 3D kinematics of the jaw and digastric muscle during feeding in rabbits. Subsequently, the work loop technique was used to simulate in vivo muscle behaviour in situ, enabling muscle force to be quantified in relation to muscle strain and hence determine the muscle's function during mastication. When functioning on either the working or balancing side, the digastric muscle generates a large amount of positive work during jaw opening, and a large amount of negative work during jaw closing, on average producing a relatively small amount of net negative work. Our data therefore further support the hypothesis that muscle spindle abundance is linked to muscle function; specifically, muscles that absorb a relatively large amount of negative work have a low spindle abundance.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11449450/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142288922","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}

引用次数: 0

Torpor energetics are related to the interaction between body mass and climate in bats of the family Vespertilionidae. 蚕蛾科蝙蝠的冬眠能量与体质和气候之间的相互作用有关。

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-09-15 Epub Date: 2024-09-20 DOI: 10.1242/jeb.246824

Jorge Ayala-Berdon, Kevin I Medina-Bello

{"title":"Torpor energetics are related to the interaction between body mass and climate in bats of the family Vespertilionidae.","authors":"Jorge Ayala-Berdon, Kevin I Medina-Bello","doi":"10.1242/jeb.246824","DOIUrl":"10.1242/jeb.246824","url":null,"abstract":"Torpor is an adaptive strategy allowing heterothermic animals to cope with energy limitations. In birds and mammals, intrinsic and extrinsic factors, such as body mass and ambient temperature, are the main variables influencing torpor use. A theoretical model of the relationship between metabolic rate during torpor and ambient temperature has been proposed. Nevertheless, no empirical attempts have been made to assess the model predictions under different climates. Using open-flow respirometry, we evaluated the ambient temperature at which bats entered torpor and when torpid metabolic rate reached its minimum, the reduction in metabolic rate below basal values, and minimum torpid metabolic rate in 11 bat species of the family Vespertilionidae with different body mass from warm and cold climates. We included data on the minimum torpid metabolic rate of five species we retrieved from the literature. We tested the effects using mixed-effect phylogenetic models. All models showed a significant interaction between body mass and climate. Smaller bats went into torpor and reached minimum torpid metabolic rates at warmer temperatures, showed a higher reduction in the metabolic rate below basal values, and presented lower torpid metabolic rates than larger ones. The slopes of the models were different for bats from different climates. These results are likely explained by differences in body mass and the metabolic rate of bats, which may favor larger bats expressing torpor in colder sites and smaller bats in the warmer ones. Further studies to assess torpor use in bats from different climates are proposed.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142107971","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

Biomechanical and morphological determinants of maximal jumping performance in callitrichine monkeys. 茧猴最大跳跃能力的生物力学和形态学决定因素

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-09-15 Epub Date: 2024-09-30 DOI: 10.1242/jeb.247413

Grégoire Boulinguez-Ambroise, Doug M Boyer, Noah T Dunham, Gabriel S Yapuncich, Madison Bradley-Cronkwright, Angel Zeininger, Daniel Schmitt, Jesse W Young

{"title":"Biomechanical and morphological determinants of maximal jumping performance in callitrichine monkeys.","authors":"Grégoire Boulinguez-Ambroise, Doug M Boyer, Noah T Dunham, Gabriel S Yapuncich, Madison Bradley-Cronkwright, Angel Zeininger, Daniel Schmitt, Jesse W Young","doi":"10.1242/jeb.247413","DOIUrl":"10.1242/jeb.247413","url":null,"abstract":"Jumping is a crucial behavior in fitness-critical activities including locomotion, resource acquisition, courtship displays and predator avoidance. In primates, paleontological evidence suggests selection for enhanced jumping ability during their early evolution. However, our interpretation of the fossil record remains limited, as no studies have explicitly linked levels of jumping performance with interspecific skeletal variation. We used force platform analyses to generate biomechanical data on maximal jumping performance in three genera of callitrichine monkeys falling along a continuum of jumping propensity: Callimico (relatively high propensity jumper), Saguinus (intermediate jumping propensity) and Callithrix (relatively low propensity jumper). Individuals performed vertical jumps to perches of increasing height within a custom-built tower. We coupled performance data with high-resolution micro-CT data quantifying bony features thought to reflect jumping ability. Levels of maximal performance between species - e.g. maximal take-off velocity of the center of mass (CoM) - parallel established gradients of jumping propensity. Both biomechanical analysis of jumping performance determinants (e.g. CoM displacement, maximal force production and peak mechanical power during push-off) and multivariate analyses of bony hindlimb morphology highlight different mechanical strategies among taxa. For instance, Callimico, which has relatively long hindlimbs, followed a strategy of fully extending of the limbs to maximize CoM displacement - rather than force production - during push-off. In contrast, relatively shorter-limbed Callithrix depended mostly on relatively high push-off forces. Overall, these results suggest that leaping performance is at least partially associated with correlated anatomical and behavioral adaptations, suggesting the possibility of improving inferences about performance in the fossil record.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142108025","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

Dynamic soaring decouples dynamic body acceleration and energetics in albatrosses. 动态翱翔使信天翁的动态身体加速度与能量脱钩。

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-09-15 Epub Date: 2024-09-25 DOI: 10.1242/jeb.247431

Melinda G Conners, Jonathan A Green, Richard A Phillips, Rachael A Orben, Chen Cui, Petar M Djurić, Eleanor Heywood, Alexei L Vyssotski, Lesley H Thorne

{"title":"Dynamic soaring decouples dynamic body acceleration and energetics in albatrosses.","authors":"Melinda G Conners, Jonathan A Green, Richard A Phillips, Rachael A Orben, Chen Cui, Petar M Djurić, Eleanor Heywood, Alexei L Vyssotski, Lesley H Thorne","doi":"10.1242/jeb.247431","DOIUrl":"10.1242/jeb.247431","url":null,"abstract":"Estimates of movement costs are essential for understanding energetic and life-history trade-offs. Although overall dynamic body acceleration (ODBA) derived from accelerometer data is widely used as a proxy for energy expenditure (EE) in free-ranging animals, its utility has not been tested in species that predominately use body rotations or exploit environmental energy for movement. We tested a suite of sensor-derived movement metrics as proxies for EE in two species of albatrosses, which routinely use dynamic soaring to extract energy from the wind to reduce movement costs. Birds were fitted with a combined heart-rate, accelerometer, magnetometer and GPS logger, and relationships between movement metrics and heart rate-derived V̇O2, an indirect measure of EE, were analyzed during different flight and activity modes. When birds were exclusively soaring, a metric derived from angular velocity on the yaw axis provided a useful proxy of EE. Thus, body rotations involved in dynamic soaring have clear energetic costs, albeit considerably lower than those of the muscle contractions required for flapping flight. We found that ODBA was not a useful proxy for EE in albatrosses when birds were exclusively soaring. As albatrosses spend much of their foraging trips soaring, ODBA alone was a poor predictor of EE in albatrosses. Despite the lower percentage of time flapping, the number of flaps was a useful metric when comparing EE across foraging trips. Our findings highlight that alternative metrics, beyond ODBA, may be required to estimate energy expenditure from inertial sensors in animals whose movements involve extensive body rotations.","PeriodicalId":15786,"journal":{"name":"Journal of Experimental Biology","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142154292","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

Phototaxis is a satiety-dependent behavioral sequence in Hydra vulgaris. 趋光性是水螅的饱食依赖行为序列。

IF 2.8 2区生物学

Journal of Experimental Biology Pub Date : 2024-09-15 Epub Date: 2024-09-25 DOI: 10.1242/jeb.247503

Soonyoung Kim, Krishna N Badhiwala, Guillaume Duret, Jacob T Robinson

引用次数: 0