ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Invasive seaweed control. Diver covering sea floor that has been invaded by an alien species of green alga (Caulerpa taxifolia) with a tarpaulin. Liquid chlorine will be injected to kill the alga. Caulerpa is native to the Caribbean, but a strain capable of growing in cooler climates was introduced to the Mediterranean in the 1980s, probably from an aquarium. Dense Caulerpa meadows cover large regions. It is tough, fast-growing and toxic to the main herbivores in the region. It is replacing native species and causing major ecological damage, and has spread to waters off California. Photographed in the French Mediterranean.
Model release not available. Property release not required.