J. M. Hellawell

发表

Biological indicators of freshwater pollution and environmental management

J. M. Hellawell, 1986 .

Development of a rationale for monitoring

J. M. Hellawell, John M. Hellawell, 1991 .

Age Determination and Growth of the Grayling Thymallus thymallus (L.) of the River Lugg, Herefordshire

J. M. Hellawell, 1969 .

Biological Surveillance of Rivers: a Biological Monitoring Handbook

J. M. Elliott, J. M. Hellawell, 1978 .

The autecology of the chub, Squalius cephalus (L.), of the River Lugg and the Afon Llynfi

J. M. Hellawell, 1971 .

The autecology of the chub, Squalius cephalus (L.), of the River Lugg and the Afon Llynfi.: II. Reproduction

J. M. Hellawell, 1971 .

Bioassay techniques and environmental chemistry

G. E. Glass, J. M. Hellawell, 1973 .

A rapid volumetric method for the analysis of the food of fishes

J. M. Hellawell, R. Abel, 1971 .

The autecology of the chub, Squalius cephalus (L.), of the River Lugg and the Afon Llynfi.: III. Diet and feeding habits

J. M. Hellawell, 1971 .

Biological indicators of freshwater pollution and environmental management

J. M. Hellawell, 1986 .

The growth, reproduction and food of the roach Rutilus rutilus (L.), of the River Lugg, Herefordshire

J. M. Hellawell, 1972 .

Toxic substances in rivers and streams.

J. M. Hellawell, J M Hellawell, 1988, Environmental pollution.

River regulation and nature conservation

J. M. Hellawell, 1988 .

The influence of drought on the fish and invertebrate populations of an upland stream in Wales

I. Cowx, J. M. Hellawell, W. Young, 1984 .

Effects of Toxic Materials

J. M. Hellawell, 1986 .

The upstream migratory behaviour of salmonids in the River Frome, Dorset

J. M. Hellawell, G. I. Williams, H. Leatham, 1974 .

Change in natural and managed ecosystems: detection, measurement and assessment

J. M. Hellawell, 1977, Proceedings of the Royal Society of London. Series B. Biological Sciences.