Water quality and stress indicators in marine and freshwater ecosystems : linking levels of organisation (individuals, populations, communities) : invited papers from a joint Associations specialised conference : held at Napier University, Edinburgh on 6-7 September 1993 by The Freshwater Biological Association ... and The Marine Biological Association of the United Kingdom ... and The Scottish Association for Marine Science / edited by David W. Sutcliffe. - Sutcliffe, D. W. (Freshwater Biological Association special publications, 1994)