, Volume 91, Issue 4, pp 526–529 | Cite as

Leech predation on juvenile freshwater snails: effects of size, species and substrate

  • Christer Brönmark
Original Papers


The leechGlossiphonia complanata does not appear to have substantial impact on snail populations, but this may be due to most studies focusing on adult snails rather than juvenile snails. In this study I investigated how predation rates ofG. complanata feeding on newly-hatched and juvenile snails was affected by snail species, snail size, snail density and substrate, in a laboratory experiment. Number of snails eaten increased with increasing density resulting in a type II functional response curve. Predation rates were higher when leeches were feeding onLymnaea emarginata than onPhysa gyrina, whereas there was no significant difference in predation rates when they were feeding onL. emarginata andHelisoma anceps. Sandy substrates and greater snail size resulted in decreased predation rates. Sand reduced movement speed ofG. complanata, which probably reduced encounter rates. Thus, there was a comparatively large effect of leech predation on newly-hatched snails, due to a high probability of encounter and high predation rates, but spatial and temporal refuges probably reduce the importance of leech predation as a structuring force in freshwater snail assemblages.

Key words

Predation Leech Snail Habitat complexity Functional response 


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  1. Anholt B (1986) Prey selection by the predatory leechNephelopsis obscura in relation to three alternative models of foraging. Can J Zool 64:649–655Google Scholar
  2. Brown KM, DeVries DR (1985) Predation and the distribution and abundance of a pulmonate pond snail. Oecologia 66:93–99CrossRefGoogle Scholar
  3. Brown KM, Strouse BH (1988) Relative vulnerability of six freshwater gastropods to the leechNephelopsis obscura (Verrill). Freshw Biol 19:157–165Google Scholar
  4. Brönmark C, Malmqvist B (1986) Interactions between the leechGlossiphonia complanata and its gastropod prey. Oecologia 69:268–276CrossRefGoogle Scholar
  5. Brönmark C, Klosiewski SP, Stein RA (1992) Indirect effects of predation in a freshwater, benthic food chain. Ecology (in press)Google Scholar
  6. Chernin E, Michelson H, Augustine DW (1956) Studies on the biological control of schistosome-bearing snails. II. The control ofAustralorbis glabratus populations by the leech,Helobdella fusca, under laboratory conditions. Am J Trop Med Hyg 5:308–314PubMedGoogle Scholar
  7. Covich AP (1977) How do crayfish respond to plants and Mollusca as alternate food resources? In: Lindqvist OV (ed) Freshwater crayfish. Third International Symposium on Freshwater Crayfish. University of Kuopio Press, Finland, pp 165–179Google Scholar
  8. Davies RW, Everett RP (1975) The feeding of four species of freshwater Hirudinoidea in Southern Alberta. Verh Internat Verein Limnol 19:2816–2827Google Scholar
  9. Hershey AE (1990) Snail populations in arctic lakes: competition mediated by predation? Oecologia 82:26–32CrossRefGoogle Scholar
  10. Hubendick B (1947) Die Verbraitungsverhaltnisse der limnischen Gastropoden in Südschweden. Zool Bidr, Uppsala 24:415–559Google Scholar
  11. Kelly PM, Cory JS (1987) Operculum closing as a defence against predatory leeches in four British freshwater prosobranch snails. Hydrobiologia 144:121–124Google Scholar
  12. Kesler DH, Munns WR Jr (1989) Predation byBelostoma flumineum (Hemiptera): an important cause of mortality in freshwater snails. J N Am Benthol Soc 8:342–350Google Scholar
  13. Lodge DM, Brown KM, Klosiewski SP, Stein RA, Covich AP, Leathers BK, Brönmark C (1987) Distribution of freshwater snails: Spatial scale and the relative importance of physicochemical and biotic factors. Am Malac Bull 5:73–84Google Scholar
  14. Manguin S, Vala J-C (1989) Prey consumption by larvae ofTetanocera ferruginea (Diptera: Sciomyzidae) in relation to number of snail prey species available. Ann Entomol Soc Am 82:588–592Google Scholar
  15. McAnnaly RD, Moore DV (1966) Predation by the leechHelobdella punctato-lineata uponAustralorbis glabratus under laboratory conditions. J Parasitol 52:196–197Google Scholar
  16. Merrick GW, Hershey AE, McDonald ME (1991) Lake trout (Salvelinus namaycush) control of snail density and size distribution in an arctic lake. Can J Fish Aquat Sci 48:498–502Google Scholar
  17. Rasmussen JB (1987) The effect of a predatory leech,Nephelopsis obscura, on mortality, growth, and production of chironomid larvae in a small pond. Oecologia 73:133–138CrossRefGoogle Scholar
  18. Sapkarev JA (1968) The taxonomy and ecology of leeches (Hirudinea) of Lake Mendota, Wisconsin. Trans Wis Acad Sci 56:225–253Google Scholar
  19. Sawyer RT (1986) Leech biology and behaviour. Oxford University Press, OxfordGoogle Scholar
  20. Slootweg R (1987) Prey selection by molluscivorous cichlids foraging on a schistosomiasis vector snail,Biomphalaria glabrata. Oecologia 74:193–202CrossRefGoogle Scholar
  21. Stein RA, Goodman CG, Marschall EA (1984) Using time and energetic measures of cost in estimating prey value for fish predators. Ecology 65:702–715Google Scholar
  22. Townsend CR, McCarthy TK (1980) On the defence strategy ofPhysa fontinalis (L.), a freshwater pulmonate snail. Oecologia 46:75–79CrossRefGoogle Scholar
  23. Wrona FJ, Davies RW, Linton L (1979) Analysis of the food niche ofGlossiphonia complanata (Hirudinoidea: Glossiphoniidae). Can J Zool 57:2136–2142Google Scholar
  24. Young JO, Ironmonger JW (1980) A laboratory study of the food of three species of leeches occurring in British lakes. Hydrobiol 68:209–215CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Christer Brönmark
    • 1
  1. 1.Department of Animal EcologyLund UniversityLundSweden

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