917a21c5_y_and_diverse_marine_ecosystem__WHAT_IS_ALREADY_HAPPENING
[0] Plankton FRS; SAHFOS [WHAT COULD HAPPEN] Continued increase in sea temperature, due to climate change and associated changes such as ocean acidification, are likely to exert major influences on plankton abundance and geographical distributions, with implications for primary production and climate control. [WHAT IS ALREADY HAPPENING] 
A 1,000-km northward shift of warmer-water plankton, with a similar retreat of colder-water plankton, has been observed in the north-east Atlantic over the past 50 years, as the seas around the UK have become warmer. In the North Sea, the population of the previously dominant and important cold-water zooplankton species Calanus finmarchicus has declined in biomass by 70% since the 1960s. The seasonal timing of plankton production has altered in response to recent climate changes. Some species are occurring up to four to six weeks earlier than 20 years ago, affecting predators, including fish.
Healthy and diverse marine ecosystem
WHAT IS ALREADY HAPPENING