#reef-survey

2 articles

A diver ecologist holds a white quadrat frame over young kelp growing on a seeded restoration line, with long-spined sea urchins scattered across pale rock nearby (illustrative scene).

Field Notes: What the Holdfast Census Found in the Urchin Zone

Field notes from a winter holdfast census across a Tasmanian reseeding site: urchin counts on treated vs control transects, and what we changed for next season.

Jack Callum · September 26, 2026

Explore11 min read

How to Join a Citizen-Science Reef Survey (and Make Your Data Count)

Join a diver or snorkeller reef survey: the main program types, the training, the transects and how to make your volunteer data scientifically usable.

Tom Okafor · August 20, 2026

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