...Kamron Kayhani; Felipe S. Barreto ABSTRACT Determining the mechanisms by which organisms evolve thermal tolerance is crucial to predicting how populations may respond to changes in local temperature regimes. Although evidence of relationships between mitochondrial background and thermal adaptation...

...Ian A. Bouyoucos; Alyssa M. Weinrauch; Ken M. Jeffries; W. Gary Anderson ABSTRACT Thermal tolerance and associated mechanisms are often tested via the critical thermal maximum (CT max ). The agitation temperature is a recently described thermal limit in fishes that has received little mechanistic...

..., respectively). Finally, the oxygen level at which bradycardia occurred was significantly higher in free-swimming salmon than in those in respirometers (∼62% versus 53% air saturation). These results: highlight the limitations of some lab-based methods of determining f H parameters and thermal tolerance...

... . 10.1387/ijdb.062241mc Cooper , C. J. , Kristan , W. B. and Eme , J. ( 2021 ). Thermal tolerance and routine oxygen consumption of convict cichlid, Archocentrus nigrofasciatus , acclimated to constant temperatures (20°C and 30°C) and a daily temperature cycle (20° C→ 30° C) . J...

.... and Moran , N. A. ( 2007 ). Aphid thermal tolerance is governed by a point mutation in bacterial symbionts . PLoS Biol. 5 , e96 . 10.1371/journal.pbio.0050096 Engel , P. and Moran , N. A. ( 2013 ). The gut microbiota of insects–diversity in structure and function . FEMS...

... focus on the ability of species to tolerate low temperatures, whereas studies investigating physiological adaptations of species to periodically warm and variable temperatures are few. In this study, we investigated temporal changes in thermal tolerances and the transcriptome in the Greenlandic seed bug...

... pathways that could be contributing to increased thermal tolerance in colonized tadpoles including amino acid metabolism, vitamin biosynthesis and ROS scavenging pathways. Our results demonstrate that the microbiome influences host plasticity and the response of hosts to environmental stressors. 13 10...

.... Metabolic scaling Body size Temperature Global warming Species distribution Thermal tolerance Ministero dell’Università e della Ricerca Universita del Salento (DiSTeBA) Interreg CASCADE 10255941 Climate change has altered ecological rates by shifting...

... Summary: Variation in thermal sensitivity of metabolism and thermal tolerance within and among Fundulus heteroclitus populations is wide and trait dependent, suggesting individuals have numerous adaptive strategies for dealing with temperature. Fundulus heteroclitus Metabolism CT max...

... sensitivity of their hearts; this rapid cardiac thermal plasticity may help migratory fishes like Arctic char mitigate short-term thermal challenges. Heart rate Thermal variation Acclimation rate Climate change Thermal tolerance Cardiac function Polar Knowledge Canada http://dx.doi.org...

... thermal tolerance in ectotherms can be limited by the capacity for oxygen uptake ( Blasco et al., 2020 ; Fry, 1971 ; Pörtner, 2010 ). However, the fact that size-related variation in Ṁ O 2 ,max only accounted for about 60% of the variation in CTS max indicates that other mechanisms must have...

...Carlie A. Muir; Shawn R. Garner; Sashko Damjanovski; Bryan D. Neff ABSTRACT In many fishes, upper thermal tolerance is thought to be limited in part by the heart's ability to meet increased oxygen demands during periods of high temperature. Temperature-dependent plasticity within the cardiovascular...

... has limited thermal tolerance ( Voigt, 1895 ; Thienemann, 1950 ). The species occurs primarily where annual average water temperature is <15°C and tolerates temperatures as low as 0.7°C ( Voigt, 1895 ; Reynoldson, 1981 ; Durance and Ormerod, 2007 ). Despite this preference for the cold habitat...

...Nicole E. Moyen; George N. Somero; Mark W. Denny ABSTRACT Thermal performance curves are commonly used to investigate the effects of heat acclimation on thermal tolerance and physiological performance. However, recent work indicates that the metrics of these curves heavily depend on experimental...

... temperatures ( Kirk et al., 2018 ; Moghaddam et al., 2021 ; Savary et al., 2021 ). Northern GBR corals also demonstrate higher thermal tolerances compared with some central populations, in which heritable host genetic mechanisms play a role in the thermal resistance of these northern corals ( Dixon et al...

... explanations as to why heart rate, but not stroke volume, increases in fish with temperature, and why maximal heart rate is constrained at cool/cold temperatures. Fish Thermal tolerance Diastolic filling Contraction frequency Stroke volume Lengthening work Natural Sciences and Engineering...

... enhance thermal tolerance as a function of stress duration. Furthermore, by investigating recovery rates post-stress, we also show that the process of heat-hardening and recovery post-heat knockdown are likely to be based on set of (at least partially) divergent mechanisms. This could bear ecological...

...%), and highest at 20°C in salmon. This study provides several mechanistic explanations as to their inter-specific difference in upper thermal tolerance, and potentially why southern char populations are being negatively impacted by climate change. Table 1. Physical characteristics of fish...

...Lisa Bjerregaard Jørgensen; Johannes Overgaard; Florence Hunter-Manseau; Nicolas Pichaud ABSTRACT Ectotherm thermal tolerance is critical to species distribution, but at present the physiological underpinnings of heat tolerance remain poorly understood. Mitochondrial function is perturbed...

... scopes for aerobic performance also set the capacity of species to interact with others at the ecosystem level. Niche limits and widths are shifting and probably interdependent across life stages, with young adults being least thermally vulnerable. The principles of thermal tolerance and performance may...