PADI Divemaster Certification Practice Exam

Do coral reefs require high nutrients due to their productivity?

1. Yes

2. No

3. Only in certain areas

4. Only during spawning season

The correct answer is: No

Coral reefs are highly productive ecosystems, but they do not require high levels of nutrients to thrive. In fact, coral reefs are often found in nutrient-poor waters, where conditions can be challenging for other types of marine life. The symbiotic relationship between corals and zooxanthellae (the algae living within their tissues) is crucial to their productivity. These algae perform photosynthesis, converting sunlight into energy, which in turn provides nutrients to the corals. Coral reefs have adapted to capture and recycle nutrients very efficiently, allowing them to flourish even in lower nutrient environments. Their productivity largely depends on light availability and the presence of clean, warm water rather than high nutrient concentrations. Excessive nutrients can actually lead to harmful algal blooms, which can smother corals and disrupt the delicate balance of the reef ecosystem. In summary, while coral reefs are productive, their health and growth are better supported by low nutrient levels, making them unique among other marine environments.