Oxygen-producing plankton are on the decline in the western Indian Ocean, new research suggests. The work tracked changes in water color across the ocean caused by the presence — or absence — of phytoplankton, such as that seen in this swirling 2013 phytoplankton bloom. The research reveals that phytoplankton populations in the region fell an alarming 30 percent over the last 16 years, threatening to turn the western Indian Ocean into an "ecological desert." https://www.sciencenews.org/article/phytoplankton-rapidly-disappearing-indian-ocean
If the actual cause is stratification and nutrient deprivation, a possible countervailing consequence of warming is visible in a paper hyperlinked from that site: http://www.eurekalert.org/pub_releases/2016-02/agu-gis020216.php That would apply in different oceans, far away, of course. "WASHINGTON, DC -- Not only is Greenland's melting ice sheet adding huge amounts of water to the oceans, it could also be unleashing 400,000 metric tons of phosphorus every year - as much as the mighty Mississippi River releases into the Gulf of Mexico, according to a new study. Phosphorus is a key nutrient that could, if it reaches the open ocean, enrich waters of the Arctic Ocean, potentially stimulating growth of the marine food chain, the study's authors said."
Some more problems related to warming oceans. The celebrated seafood of the northeast US, such Maine lobster and New England clams, is under threat from warming temperatures and ocean acidification , a new study warns. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0146756
