The article by Raquel Vaquer-Sunyer and Carlos M. Duarte examines the thresholds of hypoxia for marine biodiversity, highlighting the severe consequences of hypoxia on marine life, including death and catastrophic changes. Hypoxia is expected to increase due to coastal eutrophication and global warming. A comparative analysis of benthic organisms revealed that hypoxia thresholds vary widely across species, with the conventional threshold of 2 mg O2/liter being below the empirical sublethal and lethal O2 thresholds for half of the species tested. This suggests that the number and area of coastal ecosystems affected by hypoxia have been underestimated. The study found that the most sensitive organisms were crustaceans, followed by fish, molluscs, and other taxa, with significant differences in oxygen thresholds among taxa. The authors argue that the current threshold of 2 mg O2/liter is inadequate for conserving coastal biodiversity and fisheries resources, and propose revised thresholds to better protect these ecosystems. The findings indicate that hypoxia impacts occur at a broader range of oxygen concentrations than previously thought, and that the vulnerability of coastal ecosystems to hypoxia is greater than currently recognized.The article by Raquel Vaquer-Sunyer and Carlos M. Duarte examines the thresholds of hypoxia for marine biodiversity, highlighting the severe consequences of hypoxia on marine life, including death and catastrophic changes. Hypoxia is expected to increase due to coastal eutrophication and global warming. A comparative analysis of benthic organisms revealed that hypoxia thresholds vary widely across species, with the conventional threshold of 2 mg O2/liter being below the empirical sublethal and lethal O2 thresholds for half of the species tested. This suggests that the number and area of coastal ecosystems affected by hypoxia have been underestimated. The study found that the most sensitive organisms were crustaceans, followed by fish, molluscs, and other taxa, with significant differences in oxygen thresholds among taxa. The authors argue that the current threshold of 2 mg O2/liter is inadequate for conserving coastal biodiversity and fisheries resources, and propose revised thresholds to better protect these ecosystems. The findings indicate that hypoxia impacts occur at a broader range of oxygen concentrations than previously thought, and that the vulnerability of coastal ecosystems to hypoxia is greater than currently recognized.