Wart slug on ailing reef…

The reef be dying...

Reefs the world over are suffering, as warming water (and possibly other factors) disrupt their productive symbiosis with a specific protozoa, zooxanthella. Each relies on the other for nutrients and energy, and the protozoa also give hard coral blocks their color.

But when this is cycle is disrupted — again, mostly my warming waters due to global warming but also acidification — the corals can’t maintain this balance and typically expel their zooxanthellae. This leads to a bleached — white or light colored — reef, which is my experience is typically then recovered by a different algae, like we see above.

This whole imbalance also typically wipes out other sensitive populations. For example, in the Andamans, the fast-evolving delicate nudibranchs have all but disappeared according to environmentalists and the dive community. When I was diving there, only the varicose wart slugs (above) were left.

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