#green-sea-urchin

2 articles

Green Sea Urchin: The Boreal Grazer That Built the Northern Barrens

The green sea urchin grazes kelp from Norway to Nova Scotia to Alaska. Its biology, the barrens it builds, the roe fishery it feeds, and how reefs recover.

Dr. Mara Ellison · September 26, 2026

Atlas8 min read

Kelp Forests of Newfoundland and Labrador: Cold-Water Kelp and Cod

A guide to Newfoundland's kelp forests — sugar kelp reefs in ice-cold Atlantic water, urchin barrens, the cod collapse's shadow, and what recovery looks like.

Dr. Mara Ellison · May 14, 2026

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