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Home > RNZ: Our Changing World > The thorny issue of the long-spined urchin


	Podcast:		RNZ: Our Changing World
	Episode:		The thorny issue of the long-spined urchin
	Category:		Science & Medicine
	Duration:		00:26:34
	Publish Date:		2026-03-02 16:00:00
	Description:		A native species is taking over a jewel-in-the crown marine reserve. But what can be done? Centrostephanus, the long-spined urchin, is munching its way through the world-renowned rock walls and kelp beds of the Poor Knights Islands. DOC, University of Auckland scientists and a local hapū are running removal trials to investigate whether this might be a way to manage its march. *Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.* Learn more: Listen to the Voice of Tangaroa podcast, focusing on marine issues around New Zealand. Kina-nomics asks if we can eat our way out of the kina barren problem. For more about rock wall communities, dive into the murky depths of Fiordland, to learn about the sponges, sea squirts and black corals clinging to the undersea cliffs. Kelp is an important part of the underwater ecosystem, habitat and food for many organisms. Here how a team in Wellington are trying to restore lost kelp beds there. Guests: Dr Nick Shears, University of Auckland, Rocky Reef Lab Instagram Dr Arie Spyksma, University of Auckland Dr Celia Balemi, University of Auckland Dr Sarah Meadows, Department of Conservation Dr Monique Ladds, Department of Conservation Sandra Hawken, Te Whānau a Rangiwhakaahu Go to this episode on rnz.co.nz for more details
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