scholarly journals Physiological responses to elevated temperature across the geographic range of a terrestrial salamander

2018 ◽  
Vol 221 (18) ◽  
pp. jeb178236 ◽  
Author(s):  
Alexander J. Novarro ◽  
Caitlin R. Gabor ◽  
Cory B. Goff ◽  
Tori D. Mezebish ◽  
Lily M. Thompson ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Physiological Responses ◽  
Geographic Range

scholarly journals Hot and bothered: effects of elevated Pco2 and temperature on juvenile freshwater mussels

2018 ◽  
Vol 315 (1) ◽  
pp. R115-R127 ◽  
Author(s):  
Jennifer D. Jeffrey ◽  
Kelly D. Hannan ◽  
Caleb T. Hasler ◽  
Cory D. Suski
Keyword(s):  
Elevated Temperature ◽  
Freshwater Mussels ◽  
Physiological Responses ◽  
Environmental Stressors ◽  
Interactive Effects ◽  
Mrna Levels ◽  
Acid Base ◽  
Consumption Rates ◽  
The Individual ◽  
Measured Exposure

Multiple environmental stressors may interact in complex ways to exceed or diminish the impacts of individual stressors. In the present study, the interactive effects of two ecologically relevant stressors [increased temperature and partial pressure of carbon dioxide (Pco2)] were assessed for freshwater mussels, a group of organisms that are among the most sensitive and rapidly declining worldwide. The individual and combined effects of elevated temperature (22°C–34°C) and Pco2 (~230, 58,000 µatm) on juvenile Lampsilis siliquoidea were quantified over a 5- or 14-day period, during which physiological and whole animal responses were measured. Exposure to elevated temperature induced a series of physiological responses, including an increase in oxygen consumption rates following 5 days of exposure at 31°C and an increase in carbonic anhydrase ( ca) and heat shock protein 70 mRNA levels following 14 days of exposure at 28°C and 34°C, respectively. Treatment with elevated Pco2 activated acid-base regulatory responses including increases in CA and Na+-K+-ATPase activity and a novel mechanism for acid-base regulation during Pco2 exposure in freshwater mussels was proposed. Thermal and CO2 stressors also interacted such that responses to the thermal stressor were diminished in mussels exposed to elevated Pco2, resulting in the greatest level of mortality. Additionally, larger mussels were more likely to survive treatment with elevated Pco2 and/or temperature. Together, exposure to elevated Pco2 may compromise the ability of juvenile freshwater mussels to respond to additional stressors, such as increased temperatures, highlighting the importance of considering not only the individual but also the interactive effects of multiple environmental stressors.

Effect of elevated temperature on the physiological responses of marine Chlorella strains from different latitudes

2017 ◽  
Vol 30 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Bahram Barati ◽  
Phaik-Eem Lim ◽  
Sook-Yee Gan ◽  
Sze-Wan Poong ◽  
Siew-Moi Phang ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Physiological Responses
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