Ocean acidification effects on the nutritional quality of phytoplankton for copepod reproduction

Four species of phytoplankton (Rhodomonas salina, Skeletonema marinoi, Prorocentrum micans, Isochrysis galbana) were grown under present-day low (400ppm pCO2, pH~8.1) and predicted-future high (lOOOppm pCO2, pH~7.8) ocean acidification conditions using nitrate-limited semi-continuous batch cultures. For four days, female Acartia tonsa copepods were fed a phytoplankton mixture from either the low or high pCO2 treatment cultures. Phytoplankton fatty acid profiles were analyzed to assess changes in cellular essential fatty acid (EFA) content. Copepod egg production (EP), hatching success (HS), and egg viability (EV) were analyzed to assess differences in copepod reproductive success. Phytoplankton cultured under high pCO2 contained less EFAs compared to phytoplankton cultured under low pCO2. Female copepods fed high pCO2 phytoplankton had lower EP, HS, and EV compared to females fed low pCO2 phytoplankton. This laboratory study demonstrates that ocean acidification changes the nutritional quality of primary producers, which affects the potential reproductive success of fundamental primary consumers.

Meyers M. T., 2016. Ocean acidification effects on the nutritional quality of phytoplankton for copepod reproduction. MSc thesis, San Francisco State University, 70 p. Thesis.


  • Reset

Subscribe

OA-ICC Highlights


%d bloggers like this: