The study, published in Communications Earth and Environment, analysed fossilised plankton from the Arabian Sea. The research team used core samples gathered through the Ocean Drilling Program to study foraminifera, microscopic plankton whose fossilised shells reveal past ocean conditions. Dr Auderset said: "Today parts of the Arabian sea are ‘suboxic’, supporting only limited marine life due to minimal oxygenation. Dr Auderset said: "Our results suggest that ocean oxygen loss, already underway today, is strongly shaped by local oceanography. The study points to a complex relationship between climate, ocean processes, and marine ecosystems, highlighting the need for adaptive strategies as the planet continues to warm.