scholarly journals Summer temperatures reach the thermal tolerance threshold of photosynthetic decline in temperate conifers

Plant Biology ◽  
2021 ◽  
Author(s):  
N. Kunert ◽  
P. Hajek ◽  
P. Hietz ◽  
H. Morris ◽  
S. Rosner ◽  
...  
Keyword(s):  
Thermal Tolerance ◽  
Summer Temperatures

scholarly journals Thermal tolerance depends on season, age and body condition in imperilled redside dace Clinostomus elongatus

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Andy J Turko ◽  
Colby B Nolan ◽  
Sigal Balshine ◽  
Graham R Scott ◽  
Trevor E Pitcher
Keyword(s):  
Water Temperature ◽  
Body Condition ◽  
Thermal Tolerance ◽  
Habitat Restoration ◽  
Stream Temperature ◽  
Causal Link ◽  
Safety Margins ◽  
Summer Temperatures ◽  
Chrosomus Erythrogaster ◽  
Autumn And Winter

Abstract Urbanization tends to increase water temperatures in streams and rivers and is hypothesized to be contributing to declines of many freshwater fishes. However, factors that influence individual variation in thermal tolerance, and how these may change seasonally, are not well understood. To address this knowledge gap, we studied redside dace Clinostomus elongatus, an imperilled stream fish native to rapidly urbanizing areas of eastern North America. In wild redside dace from rural Ohio, USA, acute upper thermal tolerance (i.e. critical thermal maximum, CTmax) ranged between ~34°C in summer (stream temperature ~22°C) and 27°C in winter (stream temperature ~2°C). Juveniles had higher CTmax than adults in spring and summer, but in winter, CTmax was higher in adults. Thermal safety margins (CTmax − ambient water temperature; ~11°C) were less than the increases in peak water temperature predicted for many redside dace streams due to the combined effects of climate change and urbanization. Furthermore, behavioural agitation occurred 5–6°C below CTmax. Safety margins were larger (>20°C) in autumn and winter. In addition, redside dace were more sensitive (2.5°C lower CTmax) than southern redbelly dace Chrosomus erythrogaster, a non-imperilled sympatric cyprinid. Body condition (Fulton’s K) of adult redside dace was positively correlated with CTmax, but in juveniles, this relationship was significant only in one of two summers of experiments. Next, we measured CTmax of captive redside dace fed experimentally manipulated diets. In adults, but not juveniles, CTmax was higher in fish fed a high- vs. low-ration diet, indicating a causal link between nutrition and thermal tolerance. We conclude that redside dace will be challenged by predicted future summer temperatures, especially in urbanized habitats. Thus, habitat restoration that mitigates temperature increases is likely to benefit redside dace. We also suggest habitat restoration that improves food availability may increase thermal tolerance, and thus population resilience.

scholarly journals Thermal Inactivation of Susceptible and Multiantimicrobial-Resistant Salmonella Strains Grown in the Absence or Presence of Glucose

2003 ◽  
Vol 69 (7) ◽  
pp. 4123-4128 ◽  
Author(s):  
R. T. Bacon ◽  
J. R. Ransom ◽  
J. N. Sofos ◽  
P. A. Kendall ◽  
K. E. Belk ◽  
...  
Keyword(s):  
Heat Stress ◽  
Protective Effect ◽  
Thermal Tolerance ◽  
Thermal Inactivation ◽  
Survival Curves ◽  
Acid Adaptation ◽  
Circulating Water ◽  
Glucose Levels ◽  
Study Results ◽  
Peptone Water

ABSTRACT The heat resistance of susceptible and multiantimicrobial-resistant Salmonella strains grown to stationary phase in glucose-free tryptic soy broth supplemented with 0.6% yeast extract (TSBYE−G; nonadapted), in regular (0.25% glucose) TSBYE, or in TSBYE−G with 1.00% added glucose (TSBYE+G; acid adapted) was determined at 55, 57, 59, and 61°C. Cultures were heated in sterile 0.1% buffered peptone water (50 μl) in heat-sealed capillary tubes immersed in a thermostatically controlled circulating-water bath. Decimal reduction times (D values) were calculated from survival curves having r 2 values of >0.90 as a means of comparing thermal tolerance among variables. D 59°C values increased (P < 0.05) from 0.50 to 0.58 to 0.66 min for TSBYE−G, TSBYE, and TSBYE+G cultures, respectively. D 61°C values of antimicrobial-susceptible Salmonella strains increased (P < 0.05) from 0.14 to 0.19 as the glucose concentration increased from 0.00 to 1.00%, respectively, while D 61°C values of multiantimicrobial-resistant Salmonella strains did not differ (P > 0.05) between TSBYE−G and TSBYE+G cultures. When averaged across glucose levels and temperatures, there were no differences (P > 0.05) between the D values of susceptible and multiantimicrobial-resistant inocula. Collectively, D values ranged from 4.23 to 5.39, 1.47 to 1.81, 0.50 to 0.66, and 0.16 to 0.20 min for Salmonella strains inactivated at 55, 57, 59, and 61°C, respectively. zD values were 1.20, 1.48, and 1.49°C for Salmonella strains grown in TSBYE+G, TSBYE, and TSBYE−G, respectively, while the corresponding activation energies of inactivation were 497, 493, and 494 kJ/mol. Study results suggested a cross-protective effect of acid adaptation on thermal inactivation but no association between antimicrobial susceptibility and the ability of salmonellae to survive heat stress.

scholarly journals What can everyone do about it? Sustainable individual choices that contribute to the SDGs

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
R Vareda
Keyword(s):  
Global Scale ◽  
The Sustainable Development ◽  
Individual Level ◽  
Global Partnership ◽  
Healthy Habits ◽  
Working Together ◽  
Development Goals ◽  
Summer Temperatures ◽  
Individual Choices ◽  
Sustainable Health

Abstract Background The Sustainable Development Goals (SDG) aim to solve the world's most wicked problems, which requires global partnership. That means governments, national and international organizations and worldwide leaders working together, but it also implies individuals, families and communities, which make up most of the world, must contribute. Households, schools, the health system and others have a responsibility in the consumption and demand for energy and resources of our planet and contribute largely to climate change. Awareness and population education are essential to promote action on an individual level. Objective This presentation is part of a workshop on how individuals and public health (PH) can create a more sustainable world. It aims to present the science and challenges behind changing and creating new habits, and examples of individual habits and choices everyone can make in order to contribute to the SDG and to sustainable health prevention. This presentation is based on the United Nation (UN) available material for the SDG, as well as other independent research on the subject. Results Sustainable individual actions can be divided in 3 different main themes: Food and Water - Examples. Eat a more plant-based diet; use apps like Too Good To Go®; reutilize the water from your shower... Energy - Examples. Plug all appliances into a power strip and turn them off completely when not in use; adjust your fridge and home thermostat to winter and summer temperatures; use energy efficient light bulbs; fill your house with rugs... Resources - Examples. Pay your bills online; delete your spam email; compost your food; choose a better diaper option; shop second-hand clothes... Conclusions There are a lot of habits and small choices everyone can adopt in order to contribute to a more sustainable world and to promote healthy habits. These changes may seem trivial on an individual level, but they add up to millions of resources saved for the planet at a global scale.

scholarly journals Variation in upper thermal tolerance among 19 species from temperate wetlands

2021 ◽  
Vol 96 ◽  
pp. 102856
Author(s):  
Marco Katzenberger ◽  
Helder Duarte ◽  
Rick Relyea ◽  
Juan Francisco Beltrán ◽  
Miguel Tejedo
Keyword(s):  
Thermal Tolerance ◽  
Temperate Wetlands ◽  
Upper Thermal Tolerance
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