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Experts from Heriot-Watt University's Orkney campus analysed the genetic composition of oarweed from 14 areas across the northern Atlantic ocean.

The moonlight glinted on the oarweed.

Broad-leaved oarweed covered it like giant hair, and hung drooping into the deep black pool beneath.

The short, uneasy heave of waters in among the kelpy rocks, flowing from no swell or furrow on the misty glass of sea, but like a pulse of discontent, and longing to go further; after the turn, the little rattle of invaded pebbles, the lithe relapse and soft, shampooing lambency of oarweed, then the lavered boulders pouring gritty runnels back again, and every basined outlet wavering toward another inlet; these, and every phase of each innumerable to-and-fro, made or met their impress in her fluctuating misery.