Nematode worms can learn to prefer plastic-contaminated prey over cleaner food
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Predators have been found to develop a preference for prey contaminated with microplastics, even in the presence of clean food. This discovery could have far-reaching consequences for ecosystem health and human consumption habits.
A study on nematode worms (Caenorhabditis elegans) conducted over multiple generations revealed a shift in their food preferences. Initially choosing clean bacteria over plastic-contaminated microbes, the nematodes eventually showed a preference for the plastic-laced food.
According to Song Lin Chua from Hong Kong Polytechnic University, the worms’ attraction to plastic could be attributed to their reliance on senses like smell to locate food. After prolonged exposure, the nematodes may perceive microplastics as food-like and opt to consume them. Chua suggests that this learned behavior is reversible and akin to a matter of taste, similar to humans’ fondness for sugar.
Lee Demi from Allegheny College emphasizes the significance of these findings, stating that the nematodes’ dietary choices could impact ecosystem dynamics. The ripple effect of predators favoring plastic-contaminated prey could ultimately affect human diets as well.
Chua warns that the consequences of this behavior could permeate through the food chain, highlighting the urgent need for further research and intervention to mitigate the potential risks associated with plastic pollution in ecosystems.
