 Conversely, increased damming has led to a reduction in silica supply to the ocean due to uptake by freshwater diatoms behind dams.The dominance of non-siliceous phytoplankton due to anthropogenic nitrogen and phosphorus loading and enhanced silica dissolution in warmer waters has the potential to limit silicon ocean sediment export in the future.In 2019 a group of scientists suggested acidification is reducing diatom silica production in the Southern Ocean.