June 6, 2016 — Mainers have strong cultural, historic and economic ties to the ocean. The health of the ocean is critical to our way of life. Ocean acidification is a growing problem that could damage the health of the ocean and have drastic consequences for Maine’s coastal economy.
Ocean acidification results when there is increased carbon dioxide in the atmosphere. As the amount of carbon dioxide in the atmosphere goes up, a large proportion of it – up to 40 percent – gets dissolved in rainwater. From here it ends up in lakes, ponds, rivers and ultimately the ocean.
In addition to the increased atmospheric carbon dioxide, nutrients in the runoff from the land, like fertilizer, also increase the amount of carbon dioxide entering the ocean. The increased carbon dioxide reacts with the water to form carbonic acid, making it more acidic.
The increased acidity of sea water impacts marine life. One of the most important effects is how the acid changes the way organisms use calcium. Calcium is critical to the entire food chain in the Gulf of Maine. The planktons, which make up the base of the food chain, decrease in number as the acidity of the ocean rises, and this in turn has an impact on finned fish.
For shellfish, the impact is even more dramatic. The acid interferes with the way shellfish such as clams, mussels, scallops and even the iconic Maine lobster build their shells. It also can corrode shells. If we don’t find and adopt solutions, ocean acidification could cause major problems for most, if not all, of Maine’s commercial fisheries.