Seawater carbonate chemistry and oxidative stress level and antioxidant responses in the planktonic copepod of the genus Acartia

We based our study on one of the most abundant zooplankton species Acartia bifilosa, which were collected from different depths (according to the depth of maximum copepod abundance) and times of day (night and day) during a two-week field survey in the western Gulf of Finland. We measured different biomarkers to reveal potential relationships between copepod antioxi dant defense, oxidative stress and the environmental condition (Chl a, pH, DIC, salinity, temperature) at different depth.