雅思听力

🎧 Listening Transcript

Today in our marine biology lecture, we're discussing the impact of ocean acidification on coral reefs. As carbon dioxide levels rise, the ocean absorbs more CO2, leading to a decrease in pH. This makes it harder for corals to build their calcium carbonate skeletons. A recent study monitored two reef systems: one in the Great Barrier Reef and another in the Caribbean. Surprisingly, the Caribbean reef showed a slower growth rate decline, but a higher incidence of bleaching. The researchers concluded that while acidification affects both, local factors like water temperature and pollution play a more significant role in bleaching events. So, the key is not just global CO2, but regional stressors.