00:28Transcription by CastingWords
00:44Transcription by CastingWords
01:28Transcription by CastingWords
01:33Transcription by CastingWords
01:34Its streamlining, close to perfection, enables it to cruise at 20 knots.
01:39It's one of the fastest animals in the sea.
01:46The ocean's largest inhabitant feeds almost exclusively on one of the smallest, krill, a crustacean just a few centimetres long.
02:00Gathered in a shoal, krill stain the sea red, and a single blue whale in a day can consume 40
02:07million of them.
02:16Despite the enormous size of blue whales, we know very little about them.
02:21Their migration routes are still a mystery, and we have absolutely no idea where they go to breed.
02:32They are a dramatic reminder of how much we still have to learn about the ocean and the creatures that
02:38live there.
02:42Our planet is a blue planet. Over 70% of it is covered by the sea.
02:51The Pacific Ocean alone covers half the globe.
02:54You can fly across it non-stop for 12 hours and still see nothing more than a speck of land.
03:01This series will reveal the complete natural history of our ocean planet, from its familiar shores to the mysteries of
03:09its deepest seas.
03:22By volume, the ocean makes up 97% of the Earth's inhabitable space,
03:27and the sheer quantity of marine life it contains far exceeds that which inhabits the land.
03:56But life in the ocean is not evenly spread.
03:59It's regulated by the path of currents carrying nutrients and the varying power of the sun.
04:07In this first program, we will see how these two forces interact to control the distribution of life from the
04:13coral seas to the polar wastes.
04:27After this program in a second program, we can face theiverso journeys in this many years.
04:29Under the ocean, we need a small pool to allow you to rogue on across theANT MOM for the ocean.
04:32We have to unite until STOLEN
04:32Thank you very much, LOS Institute of the Sea that are the most part for thecn superior fossemkin continent.
04:38tikia
04:39This is what NASA Master of itsます which I support this have been Practical and Black Forest Federally,
04:40We need to understand about the sea involved.
04:41That's a good day in the ocean of the ocean,
04:41They're all naar the
05:11The ocean dominates our planet.
05:32It profoundly influences the weather of all the world.
05:37Water vapour rising from it forms the clouds and generates the storms that ultimately will
05:42drench the land.
06:02The great waves that roar in towards the shores are dramatic demonstrations of its power.
06:23Waves originate far out at sea.
06:26There, even gentle breezes can cause ripples, and ripples grow into swells.
06:41Out in the open ocean, unimpeded by land, such swells can become gigantic.
07:09It's only when an ocean swell eventually reaches shallow water that it starts to break.
07:23As it approaches the coast, the water at the bottom of the swell is slowed by contact with
07:28the sea bed.
07:29The top of the swell, still travelling fast, starts to roll over, and so the wave breaks.
07:35What?
08:06The ocean never rests. Huge currents such as the Gulf Stream keep its waters constantly on the move all around
08:14the globe.
08:15It's these currents, more than any other factor, that control the distribution of nutrients and life in the seas.
08:25A tiny island lost in the midst of the Pacific.
08:28It's the tip of a huge mountain that rises precipitously from the seafloor thousands of meters below.
08:40The nearest land is 300 miles away.
08:47Isolated sea mounts like this one create oases where life can flourish in the comparatively empty expanses of the open
08:55ocean.
09:05But all the creatures that swim beside it would not be here were it not for one key factor.
09:19Far below the surface, they collide with the island's flanks and are deflected upwards, bringing with them from the depths
09:27a rich soup of nutrients.
09:31Such upwellings attract great concentrations of life.
09:44Most of the fish here are permanent residents, feeding on the plankton, the tiny floating plants and animals that are
09:51nourished by the richness brought up from the depths.
09:53And they, in turn, attract.
Comments