Harmful algal blooms continue to threaten coastal ecosystems and seafood safety worldwide. Among the organisms involved, the benthic dinoflagellate Prorocentrum lima is a known producer of diarrhetic shellfish poisoning toxins such as okadaic acid and dinophysistoxin 1. While earlier studies have linked low nutrient availability to increased toxin production, most have examined short-term stress responses. The effects of prolonged nutrient depletion on algal physiology and toxin accumulation remain less clearly understood.
