The Kelp Forest Count

Original nonfiction-style report

Each spring, dive teams measure kelp canopy along hundreds of kilometres of coastline. Their survey maps must align each rock plot to the nearest metre, because a small labelling error can misname an entire bay. (A) Marine ecologists have tracked these forests for twenty years, yet each census still turns up patterns no model predicted.

Kelp cannot be read accurately from a boat racing above the swell. Divers descend with measuring tapes and cameras, pausing at each marked plot before surfacing to log the data. (B) A skilled pair may finish only six plots before the tide turns unfavourable.

When visibility is good, the forest can look impossibly thick. Fronds rise two metres from the seafloor, overlapping until the water inside the canopy turns dim green. (C) Local rangers say the crackle of shrimp can be heard even through thick wetsuit hoods.

What makes the count consequential is that no single dive tells the whole story. One plot may be lush while a reef twenty metres away is bare after last winter's surge. (D) In this way, a morning's measurements can decide where fishing will be restricted for the next twelve months.

In recent years, warm currents have stressed the forest. Kelp—which anchors only to hard rock and shelters species found nowhere else on the reef—has thinned along exposed headlands. (E) Without healthy canopy shade, the juvenile abalone that depend on older plants vanish from the counts.

Restoration efforts are spreading along the coast. Volunteers seed lines onto quarried boulders, and schools adopt plots they hope to revisit as graduates. (F) Scientists caution that lasting recovery still depends on cooler summers returning.

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Choose from these sentences — one does not belong anywhere:

1. Divers record each plot on waterproof slates so that photographs can later be matched to exact coordinates.

2. The canopy sways so densely that fish silhouettes flicker between the blades like coins dropped through light.

3. They time each descent to the slack between swells, when the surge eases enough to stretch a tape without tearing young fronds.

4. Juvenile abalone cluster under the oldest plants, and those older patches are precisely what the survey is designed to locate.

5. Counts that differ sharply from plot to plot allow rangers to set fishing limits for the next twelve months based on a single morning's survey.

6. Fine silt washed from new housing estates has smothered bare rock so that newly settled kelp cannot grip the stone.

7. In several bays, repeat photography already shows canopy height inching upward after three seasons of careful fishing limits.