Transgenerational exposure to deoxygenation and warming disrupts mate detection in Gammarus locusta.

This article investigates the transgenerational effects of ocean warming and deoxygenation on the chemosensory-dependent mating behavior of the amphipod *Gammarus locusta*, a key crustacean species in coastal ecosystems. Over two generations (F0 and F1), male amphipods were exposed to four treatments combining present-day conditions, warming, deoxygenation, and both stressors, with behavioral trials assessing their response to female pheromones. Results showed that ocean warming increased mortality and that reduced oxygen impaired mating-related behaviors, effects that were intensified when combined; however, the F1 generation exhibited partial behavioral adaptation, particularly under combined stressors, though population recovery was incomplete by the second filial generation (F2). The study highlights the importance of considering multiple, interacting environmental stressors and transgenerational responses to better understand and predict the impacts of climate change on marine species and coastal ecosystem health.