Publication Date:
2021-06-25
Description:
This is the episodic variations in stream water chemistry associated with acid rainfall and run-off and the effect on aquatic ecosystems, with particular reference to fish populations in North West England produced by the North West Water Authority in 1985. This report looks at the biological, physical and chemical information collected over a five year period from over 100 sites on upland streams in the North West Region of which drained rocks of low buffering capacity. In both Lake District and South Pennine sites striking differences were found between the composition of invertebrate communities inhabiting acid-stressed and less acid-stressed streams. Electric fishing surveys showed that acidic streams (geometric mean pH 〈5.5) generally had abnormally low densities of salmonids ( 〈 0 .2m2) and that 0+ fish were very few or absent. The latter indicates recruitment failure. Salmon were more sensitive than trout to low pH.
Description:
Environment Agency Archives North West
Description:
+9appendices
Keywords:
Fisheries
;
Limnology
;
Management
;
England
;
North West
;
Inland Water
;
Rivers
;
Fish populations
;
Migratory species
;
Fish counters
;
Fish surveys
;
Population dynamics
;
Mortalities
;
Invertebrates
;
Acid rainfall
;
Freshwater pollution
;
Pollution effects
;
Water quality
;
Water monitoring
Repository Name:
AquaDocs
Type:
monograph
Format:
application/pdf
Format:
application/pdf
Format:
55
