Understanding the Unique Ecosystem of the Broads

A Landscape Made by Hand

The Broads feel ancient, but they are in fact the result of medieval industry. Between roughly the ninth and fourteenth centuries, people dug peat here for fuel on a vast scale, cutting thousands of turves from the fen alongside the rivers. When the sea rose and the diggings flooded, they left behind a scatter of shallow, peat-bottomed lakes. It is worth remembering as you drift past a reedbed: this is a man-made landscape, and it has only survived because people have kept working it ever since.

Today the national park holds around sixty broads and seven navigable rivers — the Bure, Yare, Ant, Thurne and Waveney among them — linked by some 200 miles of waterway. Almost every one of those broads is shallow, rarely more than a metre or two deep, and that shallowness is the key to everything else you see. Sunlight reaches the bottom, plants root across the whole lake bed, and the water teems in a way deeper lakes simply cannot match.

Reedbeds: The Vertical Habitat

Reed is the signature plant of the Broads, and a healthy reedbed is far more than a fringe of green. Common reed grows two to three metres tall, its stems packed densely enough to stand upright through winter gales. That density is what makes it valuable: it gives cover at every level, from waterline to seed head.

Bitterns rely on it completely, moving through the stems with their heads tilted sideways, and the deep booming call of a male in spring is one of the great sounds of the Broads. Marsh harriers nest low in the reeds, bearded tits ping their way across the tops, and reed warblers sing from the stems in summer. Below the waterline, otters hunt and water voles — where they survive — graze the softer shoots.

Reedbeds do not stay reedbeds without help. Left alone, they silt up and scrub over within a couple of decades. Fen reed is still cut by hand each winter on many stretches east of Norwich, and that traditional harvest is what keeps the habitat open. Two or three ways of cutting it, in rotation, gives you reed of different ages — which is exactly what wildlife needs.

The Broads Themselves

Look over the side of a boat on a quiet morning and you will often see the bottom clearly. The lakes flood with light and support an extraordinary range of plants: white and yellow water lilies, water soldier with its spiky rosettes, bladderworts that trap tiny invertebrates in underwater bladders. These plant beds shelter pike, bream, rudd and tench, and give dragonflies somewhere to lay.

The Broads are also famously nutrient-rich, which is both a blessing and a problem. Agricultural runoff and treated sewage have loaded the water with phosphate over the last century, encouraging algae that cloud the water and shade out the plants below. Restoration work — flushing some broads through with river water in winter, removing coarse fish, managing the margins — has brought several back to clarity, and you can see the difference immediately when you move from a murky reach into a clear one.

The invertebrate interest is exceptional. The swallowtail butterfly, found nowhere else in Britain, depends on milk parsley growing in the fen. The Norfolk hawker dragonfly, another Broads speciality, needs clear, plant-rich water.

Grazing Marshes and the Dykes Between Them

Away from the open water, much of the park is wet grassland, divided by a grid of dykes and drained by wind pumps. These marshes are not wild; they are farmed, and their wildlife depends on that farming continuing. Graze them with cattle and you get a short, tussocky sward where lapwings, redshank and snipe can nest and where wintering wigeon and teal graze in their thousands. Take the cattle away and the marsh turns to scrub and carr woodland within a generation, and most of the birds go with it.

The dykes are the secret weapon. Because they are shallow, sheltered and rarely disturbed, they hold an astonishing concentration of freshwater life — frogbit, water soldier, the great silver water beetle, and dragonfly larvae in numbers you would not credit. Many of the marsh dykes are cleared on rotation, or "dyke dipped", which keeps them open and stops them filling with leaf litter.

Boating Without Disturbing It

The good news is that the Broads are genuinely navigable and reward slow, curious exploration. Hiring a day boat from a riverside village and pottering up the Ant towards Dilham, or across to South Walsham Broad, will show you more wildlife than a rushed run down the Bure ever will.

• Keep to the standard 4 mph speed limit. Wash undercuts soft peat banks, collapses reedbeds and drowns nests that sit just above the waterline.
• Slow right down within a boat's length of the bank, and when passing moored craft or canoes.
• Moor only at recognised moorings. Mud weighting in mid-channel is fine; pushing into a reedbed to tie up is not.
• Give nesting season — roughly April to July — a wide berth. If a bird is calling, circling or distractingly close, you are too near.
• Keep dogs on the bank and out of the reeds, and take everything home with you.

Treat the water with a little patience and the ecosystem does the rest of the work for you. A quiet engine, a slow drift and an eye on the reed edge will give you bitterns, harriers and otters far more often than any amount of hurrying.