Jeffries, Michael <br/><br/>
Freshwater ecology :  principles and applications / 
Michael Jeffries and Derek Mills 
 - London :  Belhaven Press,  1990 
 - 285 p. :  ill. ;  23 cm. 
<br/><br/>p. 254-275 
<br/><br/><label>ISBN: </label>1852930217 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Freshwater ecology<br/>Man--influence on nature