Microplastic ingestion reduces energy intake in the clam Atactodea striata

Area of Science:

• Marine Biology
• Ecotoxicology
• Environmental Science

Background:

• Microplastic pollution poses a threat to marine ecosystems.
• Bivalves like Atactodea striata are susceptible to microplastic ingestion.
• Understanding physiological impacts is crucial for assessing ecological risks.

Purpose of the Study:

• To investigate the physiological effects of microplastic exposure on Atactodea striata.
• To determine the fate of ingested microplastics within the clam.
• To evaluate the efficiency of depuration in removing microplastics.

Main Methods:

• Exposure of Atactodea striata to two microplastic concentrations (10 and 1000 items/L).
• Measurement of physiological parameters: clearance rate, absorption efficiency, and respiration rate.
• Analysis of microplastic ingestion, pseudofaeces/faeces production, and depuration in clean water.

Main Results:

• Atactodea striata ingested microplastics, with clearance rates significantly reduced at higher concentrations.
• Respiration rate and absorption efficiency remained unchanged, indicating reduced energy intake due to lower clearance.
• Pseudofaeces production, faeces egestion, and depuration effectively minimized microplastic accumulation in clam tissues.

Conclusions:

• Microplastic ingestion negatively impacts the feeding efficiency and energy intake of Atactodea striata.
• The clam exhibits adaptive mechanisms, including pseudofaeces production and depuration, to mitigate microplastic accumulation.
• These findings highlight the physiological consequences of microplastic pollution on marine invertebrates.