If you have been paying attention to environmental news lately you may have read or heard a little bit about this thing called ocean acidification. But what is ocean acidification and why is it such a big deal?
What is ocean acidification?
|A little bit of science on ocean accidification|
In the ocean, CO2 is also getting used up through a reaction with water and carbonate (a molecule that occurs naturally in the ocean) that creates bicarbonate and carbonic acid, both of which are acidic and decrease the pH of the ocean. Overall, this reaction causes an increase in acidity, a decrease in carbonate, and a decrease in CO2 in the ocean, which pulls more CO2 out of the atmosphere to maintain the CO2 balance. Find out more here.
Why is the increased acidity in the ocean, as well as the removal of carbonate a big deal?
- The removal of carbonate from the marine environment affects organisms that use carbonate to build shells and skeletal structures such as crabs, lobsters, clams, oysters, and corals. With less carbonate available, it is harder for these animals to create their hard protective structure.
- As CO2 increases and carbonate decrease in the ocean, the acidic environment may even break down calcium carbonate of shells and corals, causing these structures to dissolve! (Image of shells dissolving on the right) This is harmful to adult organisms that have already created these calcium carbonate structures, but it is even worse for young individuals that are just trying to build these hard structures. If young individuals cannot build shells or skeletal structures, then they will not survive!
- Organisms that utilize carbonate to build calcium carbonate shells and structures are not the only ones to be affected by ocean acidification. There are thousands of species that depend on the larvae and adults of these species for food and corals provide habitat for thousands of fish and top predators. If these shell and skeleton building species are affected by ocean acidification then all of the species that depend on them, many of which are commercially important, will also be impacted.
- Many of these species also provide ecosystem services that are valuable to people. Corals provide a layer of protection to coastal habitats in storms. While, shellfish are filter feeders and can filter entire bay areas, cleaning the water for people as well as other organisms.
- Ocean acidification by itself has a big impact on the ocean, but when combined with other stressors such as overfishing, increased temperatures, melting sea ice, and coastal pollution, the effects are amplified!
|Vibrant coral communities are affected by ocean acidification|