Introduction to ecosystems  [motion picture] / 
Open University. 
 - Milton Keynes, England :  Open University,  1974. 
 - 1 film reel (22 min.) :  sd., col. ;  16 mm. +  script. 
<br/><br/> The programme examines characteristics of 4 ecosystems.  1. Port Meadow, Oxford - a flood meadow by River Thames - 2. Wytham wood, Berks - a deciduous - 3. Black Moor, near Glossop, Derbyshire - an acid peat moor - 4. a field at the Oxford University Farm - a wheatfield.  Bahan rosak (Lupus). 
<br/><br/>Narrator: Irene Ridge. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.<br/>Biological productivity.