Today, in our marine biology lecture, we'll discuss 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 process, called ocean acidification, severely affects coral growth. A recent study by the University of Queensland found that coral calcification rates have dropped by 15% since 1990. Interestingly, some coral species, like the massive Porites, show greater resilience than branching corals. However, the overall biodiversity in affected reefs is declining, with fish populations decreasing by up to 30% in high-acidification areas. Researchers emphasize the need for global action to reduce emissions.
❓ According to the lecture, what has been observed regarding coral reefs since 1990?
A. A. Coral calcification rates have increased by 15%.
B. B. Coral calcification rates have decreased by 15%.
C. C. Fish populations in all reefs have increased by 30%.
D. D. Branching corals are more resilient than massive Porites.
✅ 正确答案
B. Coral calcification rates have decreased by 15%.