BBC The Blue Planet (2001) Part 5 Seasonal Seas

The definitive story of the blue section of our planet - the oceans - which run from the shores to the open depths of the sea. Programmes include The Blue Planet, The Deep, Open Ocean, Frozen Seas, Seasonal Seas, Coral Seas, Tidal Seas, Coasts, Making Waves, Deep Trouble.

An epic, eight-part series that took five years to complete, The Blue Planet firmly re-establishes the BBC as the world's pre-eminent producer of top quality nature documentaries. Exploring every aspect of marine ecosystems, from coastal marshes to deep-sea trenches and from polar waters to tropical reefs, The Blue Planet is thorough and informative, yet never less than thrilling.

Part 5 Seasonal Seas

The fifth instalment surveys the effects of the seasons on the world's temperate seas — the most productive on Earth. Sable Island near Nova Scotia boasts the largest colony of grey seals, which breed there when the weather is at its worst. The pups remain marooned for weeks until the spring, when they are strong enough to swim. Spring also heralds the bloom of phytoplankton it provides food for copepods, and they in turn are prey to jellyfish, which assemble in vast, million-strong swarms. On the Californian coast, giant kelp also flourishes and by summer, grows at the rate of a metre a day. It provides a sanctuary for shoals of fish and sea otters, the latter anchoring themselves to the seaweed when resting and keeping its grazers in check by eating them.

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