Environmental evaluation of the Reloncaví estuary in southern Chile based on lipophilic shellfish toxins as related to harmful algal blooms

• DOI: 10.1016/j.scitotenv.2024.172374
• Publication Date: 2024-04-12T06:01:39Z
• Authors: Gonzalo Fuenzalida; Kyoko Yarimizu; Luis Norambuena; So Fujiyoshi; Ishara Uhanie Perera; Joaquin-Ignacio R...; Marco Campos; Tay Ruiz-Gil; Jonnathan Vilugrón; Alondra Sandoval-...; Mario Ortiz; Oscar Espinoza-Go...; Leonardo Guzmán; Jacqueline J. Acuña; Milko A. Jorquera; Fumito Maruyama
• Keywords: Dinophysis; Shellfish Poisoning; Red tide

The Reloncaví estuary in southern Chile is famous for its aquaculture. However, recurring harmful algal blooms have adversely affected mussel production. Therefore, regular monitoring of toxins urgently needed to better understand the contamination status estuary. In this study, we quantified 15 types lipophilic shellfish Metri Bay on a biweekly basis 4 years. We identified species using microscopy and metabarcoding analysis. also measured water temperature, salinity, chlorophyll-a, dissolved oxygen determine potential relationships these parameters with toxin Our results revealed presence trace amount pectenotoxin causal phytoplankton Dinophysis, as well yessotoxin Protoceratium. Statistical analysis indicated that fluctuations temperature detection toxins. Additionally, detected highly toxic Alexandrium spp. some samples. Although our suggest level during study period was insignificantly low current LC-MS method, confirmed algae raises concerns, given favorable environmental conditions could cause blooms.