Faculty Opinions recommendation of Plasticity in thermal tolerance has limited potential to buffer ectotherms from global warming.

2016 ◽  
Author(s):  
Sarah Diamond
Keyword(s):  
Global Warming ◽  
Thermal Tolerance

scholarly journals Intraspecific variation in thermal tolerance differs between tropical and temperate fishes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
J. J. H. Nati ◽  
M. B. S. Svendsen ◽  
S. Marras ◽  
S. S. Killen ◽  
J. F. Steffensen ◽  
...  
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Intraspecific Variation ◽  
Fish Species ◽  
Thermal Tolerance ◽  
Evolutionary History ◽  
Ecological Impacts ◽  
Temperate Species ◽  
Tropical Species ◽  
Upper Thermal Tolerance

AbstractHow ectothermic animals will cope with global warming is a critical determinant of the ecological impacts of climate change. There has been extensive study of upper thermal tolerance limits among fish species but how intraspecific variation in tolerance may be affected by habitat characteristics and evolutionary history has not been considered. Intraspecific variation is a primary determinant of species vulnerability to climate change, with implications for global patterns of impacts of ongoing warming. Using published critical thermal maximum (CTmax) data on 203 fish species, we found that intraspecific variation in upper thermal tolerance varies according to a species’ latitude and evolutionary history. Overall, tropical species show a lower intraspecific variation in thermal tolerance than temperate species. Notably, freshwater tropical species have a lower variation in tolerance than freshwater temperate species, which implies increased vulnerability to impacts of thermal stress. The extent of variation in CTmax among fish species has a strong phylogenetic signal, which may indicate a constraint on evolvability to rising temperatures in tropical fishes. That is, in addition to living closer to their upper thermal limits, tropical species may have higher sensitivity and lower adaptability to global warming compared to temperate counterparts. This is evidence that freshwater tropical fish communities, worldwide, are especially vulnerable to ongoing climate change.

scholarly journals Plasticity in thermal tolerance has limited potential to buffer ectotherms from global warming

2015 ◽  
Vol 282 (1808) ◽  
pp. 20150401 ◽  
Author(s):  
Alex R. Gunderson ◽  
Jonathon H. Stillman
Keyword(s):  
Global Warming ◽  
Thermal Tolerance ◽  
Critical Issue ◽  
Behavioural Plasticity ◽  
Extreme Temperatures ◽  
Behavioural Thermoregulation ◽  
Habitat Types ◽  
Evolutionary Mechanisms ◽  
Marine Habitats ◽  
Taxonomic Patterns

Global warming is increasing the overheating risk for many organisms, though the potential for plasticity in thermal tolerance to mitigate this risk is largely unknown. In part, this shortcoming stems from a lack of knowledge about global and taxonomic patterns of variation in tolerance plasticity. To address this critical issue, we test leading hypotheses for broad-scale variation in ectotherm tolerance plasticity using a dataset that includes vertebrate and invertebrate taxa from terrestrial, freshwater and marine habitats. Contrary to expectation, plasticity in heat tolerance was unrelated to latitude or thermal seasonality. However, plasticity in cold tolerance is associated with thermal seasonality in some habitat types. In addition, aquatic taxa have approximately twice the plasticity of terrestrial taxa. Based on the observed patterns of variation in tolerance plasticity, we propose that limited potential for behavioural plasticity (i.e. behavioural thermoregulation) favours the evolution of greater plasticity in physiological traits, consistent with the ‘Bogert effect’. Finally, we find that all ectotherms have relatively low acclimation in thermal tolerance and demonstrate that overheating risk will be minimally reduced by acclimation in even the most plastic groups. Our analysis indicates that behavioural and evolutionary mechanisms will be critical in allowing ectotherms to buffer themselves from extreme temperatures.

scholarly journals Should I shrink or should I flow? – body size adjustment to thermo-oxygenic niche

2020 ◽  
Author(s):  
Aleksandra Walczyńska ◽  
Agnieszka Gudowska ◽  
Łukasz Sobczyk
Keyword(s):  
Global Warming ◽  
Body Size ◽  
Environmental Factors ◽  
Thermal Tolerance ◽  
Ecological Niche ◽  
Tolerance Range ◽  
Important Conclusion ◽  
Species Evolution ◽  
Response To Temperature ◽  
Size Adjustment

AbstractOrganisms adjust their size according to temperature and supposedly also respond to its negative covariate, oxygen. To what extent is size a response to temperature or oxygen? We analyzed the thermo-oxygenic niche for the community of 188 rotifer species. Evolution toward ranges of thermal tolerance occurred separately from evolution toward their optima. Body size was adjusted to both temperature and oxygen, but the cues for body size response differed; size was either driven by optimal temperatures or by the oxygen tolerance range. Animals are clearly separated into generalists or specialists, and their evolutionary body size adjustment is realized through differential responses to environmental factors. Oxygen is as important as temperature in the evolution of body size and ecological niche preference. An important conclusion from this study is that oxygen deprivation following global warming seems to be as problematic for the studied organisms as the temperature increase itself.

scholarly journals Rapid-warming tolerance correlates with tolerance to slow warming but not growth at non-optimal temperatures in zebrafish

2020 ◽  
Author(s):  
Eirik Ryvoll Åsheim ◽  
Anna H Andreassen ◽  
Rachael Morgan ◽  
Fredrik Jutfelt
Keyword(s):  
Global Warming ◽  
Thermal Stress ◽  
Growth Performance ◽  
Danio Rerio ◽  
Thermal Tolerance ◽  
Optimal Temperature ◽  
Medium Term ◽  
Physiological Mechanisms

Global warming is predicted to increase both acute and prolonged thermal challenges for aquatic ectotherms. Severe short and medium-term thermal stress over hours to days may cause mortality, while longer sub-lethal thermal challenges may cause performance declines. The interrelationship between the responses to short, medium and longer thermal challenges is unresolved. We asked if the same individuals are tolerant to both rapid and slow warming challenges, a question which has so far received little attention. Additionally, we investigated the possibility of a thermal syndrome where individuals in a population are distributed along a warm-type to cold-type axis. We tested whether different thermal traits correlate across individuals by acclimating 200 juvenile zebrafish (Danio rerio) to sub- or supra- optimal temperatures for growth (22 and 34°C) for 40 days and measured growth and thermal tolerance at two different warming rates. We found that tolerance to rapid warming correlated with tolerance to slow warming. However, individual tolerance to neither rapid nor slow warming correlated with growth at the supra-optimal temperature. We thus find some support for a syndrome-like organisation of thermal traits, but the lack of connection between tolerance and growth-performance indicates a restricted generality of a thermal syndrome. The results suggest that tolerance to rapid warming may share underlying physiological mechanisms with tolerance to slower heating, and indicate that the relevance of acute critical thermal tolerance extends beyond the rapid ramping rates used to measure them.

scholarly journals Rapid-warming tolerance correlates with tolerance to slow warming but not growth at non-optimal temperatures in zebrafish

2020 ◽  
Vol 223 (23) ◽  
pp. jeb229195 ◽  
Author(s):  
Eirik R. Åsheim ◽  
Anna H. Andreassen ◽  
Rachael Morgan ◽  
Fredrik Jutfelt
Keyword(s):  
Global Warming ◽  
Thermal Stress ◽  
Growth Performance ◽  
Danio Rerio ◽  
Thermal Tolerance ◽  
Optimal Temperature ◽  
Medium Term ◽  
Physiological Mechanisms

ABSTRACTGlobal warming is predicted to increase both acute and prolonged thermal challenges for aquatic ectotherms. Severe short- and medium-term thermal stress over hours to days may cause mortality, while longer sub-lethal thermal challenges may cause performance declines. The inter-relationship between the responses to short, medium and longer thermal challenges is unresolved. We asked if the same individuals are tolerant to both rapid and slow warming challenges, a question that has so far received little attention. Additionally, we investigated the possibility of a thermal syndrome where individuals in a population are distributed along a warm-type to cold-type axis. We tested whether different thermal traits correlate across individuals by acclimating 200 juvenile zebrafish (Danio rerio) to sub- or supra-optimal temperatures for growth (22 and 34°C) for 40 days and measuring growth and thermal tolerance at two different warming rates. We found that tolerance to rapid warming correlated with tolerance to slow warming in the 22°C treatment. However, individual tolerance to neither rapid nor slow warming correlated with growth at the supra-optimal temperature. We thus find some support for a syndrome-like organisation of thermal traits, but the lack of connection between tolerance and growth performance indicates a restricted generality of a thermal syndrome. The results suggest that tolerance to rapid warming may share underlying physiological mechanisms with tolerance to slower heating, and indicate that the relevance of acute critical thermal tolerance extends beyond the rapid ramping rates used to measure them.

Lower thermal tolerance in nocturnal than in diurnal ants: a challenge for nocturnal ectotherms facing global warming

2017 ◽  
Vol 43 (2) ◽  
pp. 162-167 ◽  
Author(s):  
CARLOS GARCIA-ROBLEDO ◽  
HECTOR CHUQUILLANQUI ◽  
ERIN K. KUPREWICZ ◽  
FEDERICO ESCOBAR-SARRIA
Keyword(s):  
Global Warming ◽  
Thermal Tolerance
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