Reef Life Survey arrives in SA waters and volunteer divers get to work

The prevalence of leafy kelp off Adelaide's coastline is a barometer for marine health, and it's now under the gaze of scientists and volunteers as a worldwide movement hits South Australian waters.

State Government marine scientist Simon Bryars said some rocky reefs around the Port Noarlunga region had suffered from sediment and wastewater discharge from populated areas. "When they're in good condition, they should be covered with a thick, healthy coverage of algae — your brown branching algae, what people traditionally call seaweed," he said.

"What's happened in the past is those canopy-forming algae have disappeared and been replaced by what we call turfing algae, these small, tufty little turfs that cover the reef. "Also in some places you'll get muscle beds that basically take over the reef, so there's a switch from a nice forestry sort of habitat into a grassland."

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