Related Experiment Video
Updated: Dec 14, 2025
11:05
Analysis of Oxidative Stress in Zebrafish Embryos
Published on: July 7, 2014
37.9K
Thermal stability vs. variability: Insights in oxidative stress from a eurytolerant fish
By Peter Baker1, Isabel Van Wie1, Evan Braun1
1Colgate University, Department of Biology, 13 Oak Dr., Hamilton, NY 13346, United States of America.
Summary
Climate change-induced thermal volatility challenges aquatic ectotherms. Sheepshead minnows exposed to fluctuating temperatures showed altered oxidative stress responses, highlighting risks for marine life.
Area of Science:
- Environmental science
- Aquatic toxicology
- Climate change biology
Background:
- Climate change is increasing the frequency and intensity of heatwaves globally.
- Aquatic ectotherms face physiological challenges from thermal volatility, impacting oxidative homeostasis.
- Sheepshead minnows (Cyprinodon variegatus), a eurytolerant species, were used to study responses to thermal regimes.
Purpose of the Study:
- To investigate the effects of chronic exposure to stable and cycling thermal regimes on the oxidative physiology of sheepshead minnows.
- To assess the impact of these thermal treatments on oxidative stress during an acute thermal challenge.
- To understand how thermal variability influences antioxidant defenses and oxidative damage in marine fish.
Main Methods:
- Fish were exposed to stable temperatures (15°C, 30°C) and cycling regimes (21-29°C at 6, 8, 10-h intervals).
- Oxidative physiology was assessed by quantifying enzymatic activity (catalase, superoxide dismutase, glutathione peroxidase), radical scavenging capacities, and lipid peroxidation.
- The effects of an acute thermal challenge (32°C for 12h) on oxidative stress markers were examined.
Main Results:
- No significant differences were found in enzymatic antioxidants or lipid peroxidation across stable and cycling thermal treatments.
- Peroxyl radical scavenging capacity was highest at the peak of 8- and 10-h thermal cycles.
- Responses of peroxyl radical scavenging to an acute thermal challenge varied depending on the prior thermal regime.
Conclusions:
- Marine ectotherms, even tolerant species like sheepshead minnows, activate oxidative defenses under thermal variability.
- These findings raise concerns about the vulnerability of less tolerant aquatic species to climate change-driven thermal fluctuations.
- Understanding oxidative responses to thermal stress is crucial for predicting the ecological impacts of climate change on aquatic ecosystems.
Related Concept Videos
01:20Radical Autoxidation
2.8K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.8K
02:45Responses to Heat and Cold Stress
14.5K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
14.5K
02:02Responses to Salt Stress
14.1K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
14.1K
02:32Osmoregulation in Fishes
52.4K
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
52.4K