Is this the paper you have in mind? * Daniel G. Boyce, Marlon R. Lewis & Boris Worm. Global phytoplankton decline over the past century. Nature 466, 591–596

Is this the paper you have in mind? * Daniel G. Boyce, Marlon R. Lewis & Boris Worm. Global phytoplankton decline over the past century. Nature 466, 591–596 (2010). https://www.nature.com/articles/nature09268 https://www.nature.com/articles/nature09268