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BBC Radio 4 - 92 to 94 FM and 198 Long WaveListen to Digital Radio, Digital TV and OnlineListen on Digital Radio, Digital TV and Online

Science
TOUGH LIVES
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Monday 21:00-21:30
Mark Carwardine examines the lives of creatures who make their homes in extreme environments, and discovers the tricks they have evolved†in order to survive.
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Listen to 25 March:
Like a Fish out of Water
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MARK CARWARDINE
Mark Carwardine
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Monday 25†March 2002
Loggerhead Turtle

Like a Fish out of Water

Extreme environments may be perceived as being in very hot or very cold lands, but some are within the mildest of climates. Temperate countries can have their own challenges too. Life can be very interesting when youíre living at altitude, at depth or in a toxic environment.

Seaweed on the rocky shore has to cope with the drying effects of the baking sun in the summer. Yet it also gets drenched and submerged in very salty water twice a day, every day. On top of that itís pummelled and pulled by the waves. Fortunatley it has the necessary adaptations to cope with all those fluctuations in its daily living conditions.

Human beings cannot live without oxygen. We become very aware very quickly if deprived of it and yet from mountain top to ocean floor, thereís a wide variety of creatures almost doing without it.

The programme will explore how the real experts deal with what we think of as a "tough life". Turtles for example, donít take a breath for months on end and one unique cephalopod has its own onboard scuba tank to cope with lack of oxygen. Finally, Mark will be looking at fish which have lungs, and organisms that live in solutions which would effectively strip paint.
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