RM
Invasive seaweed control
Invasive seaweed control. Divers with a tarpaulin used in efforts to control an alien species of green alga (Caulerpa taxifolia). An infested area is covered and dilute liquid chlorine is injected underneath the tarpaulin. The alga is native to the Caribbean, but a strain capable of growing in cooler climates was introduced to the Mediterranean in the 1980s. 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.
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