A Reproducible Method to Evaluate Sublethal Acoustic Stress in Aquatic Invertebrates Using Oxidative Biomarkers

Area of Science:

• Environmental Toxicology
• Marine Biology
• Aquatic Ecotoxicology

Background:

• Underwater noise pollution from human activities is increasing in aquatic environments.
• Impacts of anthropogenic noise on aquatic invertebrates, especially during early development, are poorly understood.
• Lack of standardized laboratory protocols hinders research on noise effects in species from dynamic habitats like estuaries.

Purpose of the Study:

• To present an adaptable and reproducible laboratory protocol for assessing sublethal physiological responses to underwater noise in aquatic invertebrates.
• To evaluate the effects of recorded boat noise on ovigerous female crabs, their embryos, and larvae.
• To establish a standardized method for measuring oxidative stress biomarkers as indicators of noise-induced stress.

Main Methods:

• Exposing ovigerous female crabs (e.g., *Neohelice granulata*) to recorded boat noise using submerged transducers under controlled laboratory conditions.
• Collecting samples from embryos, larvae, and adult tissues for physiological analysis.
• Measuring oxidative stress biomarkers, including glutathione-S-transferase (GST), catalase (CAT), lipid peroxidation (LPO), and protein oxidation.

Main Results:

• The protocol allows for consistent and repeatable exposure to underwater noise.
• Oxidative stress biomarkers provide a sensitive readout of sublethal physiological stress in response to noise exposure.
• The method is applicable across various life stages, from embryos to adult tissues.

Conclusions:

• The developed protocol offers a powerful and scalable approach to investigate the physiological impacts of underwater noise on crustaceans and other aquatic invertebrates.
• Standardized laboratory methods are crucial for reliable assessment of anthropogenic stressors in ecologically important species.
• This research addresses a critical gap in understanding the effects of underwater noise on early developmental stages of aquatic invertebrates.