水下角柱海扇被红藻过度生长，环境问题

roalgae (Rhodophyta spp.) smothers the upper branches of a gorgonian sea fan at close range on an Andaman Sea reef, with schooling fusiliers (Caesio spp.) visible in open water behind. If unchecked, algal colonisation will block light and gas exchange across the gorgonian's remaining living tissue, ultimately killing the structure entirely. Gorgonian sea fans can take thirty years or more to reach full maturity, meaning each loss represents decades of reef building irreversibly removed from the ecosystem. 4K, horizontal, super close diver POV. Andaman Sea, Krabi Province, Thailand.

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