Ocean Acidification: A Silent Threat to Marine Ecosystems
Ocean acidification is often called the “evil twin” of climate change, and it’s a big, often unnoticed problem for our oceans. This issue occurs because the ocean absorbs a lot of the carbon dioxide (CO₂) we put into the air, which has some serious effects on marine life, food security, and coastal economies. Let’s break down what ocean acidification is, why it happens, and how it impacts marine ecosystems.
What is Ocean Acidification?
Ocean acidification happens when CO₂ from the air gets absorbed by the ocean and turns into carbonic acid. This makes the water more acidic. The ocean takes in about 30% of the CO₂ we produce from things like burning fossil fuels and deforestation. Over time, this extra CO₂ changes the ocean’s chemistry, which can really harm marine life and ecosystems.
How It Works
When CO₂ dissolves in seawater, it reacts with the water to form carbonic acid (H₂CO₃). This then breaks down into bicarbonate (HCO₃⁻) and hydrogen ions (H⁺). More hydrogen ions mean the water becomes more acidic. This process also reduces carbonate ions (CO₃²⁻), which many marine creatures need to build their shells and skeletons.
Impact on Marine Life
Ocean acidification significantly impacts marine organisms, particularly those that rely on calcium carbonate for their shells and skeletons, like corals, molluscs, and some plankton.
Coral reefs are especially vulnerable; with less carbonate available, corals struggle to maintain their structures, becoming weaker and more prone to damage.
Shellfish such as oysters, clams, and sea snails face difficulties in forming and maintaining their shells, leading to higher mortality rates, slower growth, and fewer offspring.
Plankton, essential to the marine food web, are also affected. Tiny marine snails and foraminifera, which form their shells from calcium carbonate, can have their shells dissolve, disrupting the food chain and impacting larger marine animals that rely on them.
Fish and other marine animals experience changes in behaviour and development due to acidification. Changes in pH can impair their senses, making it harder for them to find food, avoid predators, and navigate their environments.
Understanding ocean acidification is an important step towards protecting our oceans and preserving marine biodiversity for future generations.
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By Fahmi, AMD-B’s 2024 Divemaster Internship
