BBC Documentaries

The River: A Year in the Life of the Tay (2019x136)

Date de diffusion: Juil 03, 2019

Writer and naturalist Helen Macdonald traces the dramatic journey of Britain’s greatest river, the Tay, over an entire year. Mixing natural history, cutting-edge science and historical biography with a spectacular travelogue, the film is a celebration of our largest river as it transforms from melting Highland snow to a vast torrent flowing into the cold North Sea. Following the river’s course from Ben Lui in the west to Dundee in the east, Helen explores the Tay’s magical landscapes, encounters its rare and beautiful wildlife and traces the epic lifecycle of its iconic Salmon population across four spectacular seasons. Spring’s mountain glens reveal hardy lifeforms, honed for life in rushing water, from the Dipper, the world’s only swimming songbird, to a mayfly nymph that mimics the shape of a racing car’s aerofoil to withstand fast-flowing streams. Helen continues her travels with a visit to the remote Tay tributary, whose riverbed rocks led to an 18th-century man of science, James Hutton, becoming the first person to fully grasp the Earth’s true age, sparking the ‘heretical’ concept of deep time. As spring moves into summer, Helen studies a newly introduced wild Beaver colony to see how this controversial returnee is transforming the Tay’s landscape. She also takes a fascinating look at the microscopic life that fills the sun-drenched waters in a lab where these tiny green algae are helping to answer one of life’s great questions: how multicellular bodies like ours first evolved. Autumn’s cooling air creates darker, richer waters as the Tay’s riverside trees shed millions of leaves. This huge influx of nutrients threatens to upset the delicate balance of the river’s ecosystem. But Helen meets an unlikely saviour: the unassuming freshwater pearl mussel. As winter starts to grip, Helen’s journey reaches Perth, the point where the river begins to mingle with the sea. In the brackish water downstream lies the UK’s largest r