phytoplankton diversity

in each article, they each talk about  how phytoplankton play a major role in the food chain. due to the water becoming warmer the phytoplankton are decreasing by 40%. the  phytoplankton are decreasing and there is nothing to stop it. "The work addresses how phytoplankton species are affected by a changing environment, and the really difficult question of weather adaptation to these changes us possible. (Morello, Lauren, and ClimateWire. "Phytoplankton Population Drops 40 Percent Since 1950." Scientific American Global RSS. Scientific American, 29 July 2010. Web. 12 Feb. 2014.)