Benthic invertebrates of Rutland Water
The colonisation of Rutland Water by benthic invertebrates has been monitored from 1976 when the reservoir was first filled. A modified Ekman grab was used to sample populations quantitatively while false substrates and dredge samples were used to obtain supplementary data. Hand net and hand-sorting were used to study the littoral zone.
The dominant taxa in the reservoir are Asellus aquaticus, A. meridianus, Gammarus pulex, Crangonyx pseudogracilis, Helobdella stagnalis, Erpobdella octoculata, Polycelis tenuis, larval Chironomidae and Oligochaeta. Other species which appeared abundantly, such as Limnaea pereger and Planorbis albus, have now disappeared and it is suggested that the generally low levels of gastropods might account for the poor performance of species such as Dugesia lugubris and Glossiphonia complanata.
Other aspects of abundance are discussed, as are the effects of maturation of the system.
Keywordsreservoir benthos invertebrates colonisation abundance
Unable to display preview. Download preview PDF.
- Brown, A. & Oldham, R., 1982. Bathymetric distribution of someChironomidae(Diptera)in Rutland Water. In: Harper D. M. & Bullock, J. A. (Eds) Rutland Water — Decade of Change, pp. 159–169. Junk, The Hague.Google Scholar
- Elliott, J. M. & Mann, K. H., 1979. A Key to the British Freshwater Leeches(2nd edn). Freshwater Biological Association Scientific Publication No. 40.Google Scholar
- Harper, D. M., 1982. The feeding of trout during the filling phase of Rutland Water. In: Harper, D. M & Bullock, J. A. (Eds) Rutland Water — Decade of Change, pp. 191–198. Junk, The HagueGoogle Scholar
- Macan, T. T., 1975. Freshwater Ecology ( 2nd edn ). Longman, London.Google Scholar
- Macan, T. T. & de Silva, P. K., 1979. On the occurrence of Dendrocoelum lacteum (Müller) and Asellus aquaticus (L.) as predator and prey in the stony substratum of Windermere. Arch. Hydrobiol. 86 (1): 95–111.Google Scholar
- Rawson, D. S., 1947. An automatic-closing Ekman dredge and other equipment for use in extremely deep water. Limnological Society of American Special Publication No. 18.Google Scholar
- Reynoldson, T. B., 1978. A Key to the British Species of Freshwater Triclads (2nd edn). Freshwater Biological Association Scientific Publication No. 23.Google Scholar
- Warlow, A. & Oldham, R., 1982. Temporal variations in the diet of brown trout (Salmo trutta L.) and tainbow trout (Salmo gairdneri L.) in Rutland Water. In: Harper, D. M & Bullock, J. A. (Eds) Rutland Water — Decade of Change, pp. 199–206. Junk, The Hague.Google Scholar