"Conflicting" only if you want to ignore a significant part of the text behind the very link you give:

"A more recent multi-model study estimated that primary production would decline by 2-20% by 2100 A.D.[12] Despite substantial variation in both the magnitude and spatial pattern of change, the majority of published studies predict that phytoplankton biomass and/or primary production will decline over the next century.[11][40][41][42][43][44][45][46][47]"

(Note the majority and how many of them are cited (all the numbers in brackets) and could be checked. It's surely not "one says yes, one says no".)