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How can ocean acidification disrupt marine food chains?
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Marine ecosystem
Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.
Ocean acidification disrupts marine food chains primarily by altering the chemistry of seawater, which threatens the survival and stability of various marine organisms.1
- Impact on Calcifiers: Increased acidity reduces the availability of carbonate ions, making it difficult for organisms like coral, shellfish, and pteropods to build and maintain their shells and skeletons. Smaller or weakened organisms are more vulnerable to predators, and the potential extinction of these species threatens the stability of the entire food chain.1
- Predator-Prey Shifts: As populations of key prey species like pteropods decline, predators are forced to switch to alternative food sources. This shift places unexpected pressure on other organisms and can lead to population declines among various predators.1
- Physiological Stress: Larger animals, such as squid and fishes, may suffer from acidosis, which impairs their growth, reproduction, and respiration.1
- Habitat Loss: The decline of coral reefs—often considered centers of biodiversity—removes essential habitats and food sources for many other marine species.1