# Coral Reef Communities: Marine Biology and Conservation
> Explore the ecology, formation, and biology of coral reefs. Learn about biodiversity, reef types, zooxanthellae symbiosis, and current conservation threats.

Tags: coral-reefs, marine-biology, ecology, ocean-conservation, biodiversity, zooxanthellae, climate-change
## Introduction to Coral Reefs
* Coral reefs host 25% of all marine species and have an annual net primary productivity of 2,500 g C/m².
* They are complex ecosystems compared to tropical rainforests.

## Reef Builders & Biology
* Scleractinian (stony) corals are the primary reef builders using calcium carbonate (CaCO₃).
* **Zooxanthellae:** Symbiotic dinoflagellates provide up to 90% of a coral's energy.
* Reproductive methods include budding, fragmentation, and broadcast spawning.

## Reef Types & Anatomy
* **Fringing Reefs:** Grow along shores; most common.
* **Barrier Reefs:** Separated by lagoons; Great Barrier Reef is 2,100 km long.
* **Atolls:** Circular reefs on submerged volcanoes.
* Zones include the forereef, reef crest, reef flat, and lagoon.

## Global Distribution
* Reefs grow within the 20°C isotherm, typically between the Tropic of Cancer and Capricorn.
* Optimal growth occurs in shallow (<25m), clear, saline waters with low sedimentation.

## Reef Ecology & Interactions
* **Productivity:** Reefs recycle nutrients efficiently in nutrient-poor (oligotrophic) waters.
* **Key Interactions:** Includes competition for space, predation by Crown-of-thorns stars, and mutualisms like cleaning stations.

## Threats & Health
* **Coral Bleaching:** Stress-induced expulsion of zooxanthellae caused by rising temperatures.
* **Diseases:** Black Band, White Pox, and Yellow Band disease impact reef health.
* **Human Impact:** Overfishing, coastal development, and climate change have led to a 27% loss of reefs in 40 years.
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