Summary
The natural diet of a population of Cepaea nemoralis living in a sand dune system in southwest England was investigated by field observations and examination of crop and faeces contents. The food consisted of dead material from the commoner plants on the site. Very little green matter was eaten and there was little evidence for seasonal variation in the diet.
Consumption and egestion rates were measured gravimetrically on natural foods (dead leaves of Taraxacum officinale and Ononis repens) and artificial foods. Consumption rates were temperature dependent over the measured range of 5–20°C and also varied with the food substrate, an artificial food (rat food pellets) being consumed at the highest rate. High variability in the results can probably be linked to the live weight and activity cycles of the snails.
Assimilation was estimated as the difference between consumption and egestion, since a trial of the ash-ratio method proved unsuitable with this animal. Assimilation efficiency did not vary with temperature over the range studied, but was dependent on food substrate, the two artificial foods (rat food pellets and lettuce leaves) being assimilated more efficiently (71–73%) than natural foods (30–44%).
Faeces produced from the digestive gland could be distinguished and were measured separately. The amount produced was very small compared to the gut faeces, but increased significantly when a relatively indigestible food was used.
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References
Baker, R. A.: The ecology of the Wrinkled Snail, Helicella caperata Mont., on the Braunton Burrows sand dune system. Proc. malac. Soc. Lond. 38, 41–54 (1968)
Bocock, K. L.: The digestion and assimilation of food by Glomeris. In: J. Doeksen, J. van der Drift, eds., Soil organisms, p. 85–91. Amsterdam: North Holland 1963
Boycott, A. E.: Habitats of land molluscs in Great Britain. J. Ecol. 22, 1–38 (1934)
Calow, P.: Studies on the natural diet of Lymnea pereger obtusa (Kobelt) and its possible ecological implications. Proc. malac. Soc. Lond. 39, 203–215 (1970)
Campion, M.: The structure and function of the cutaneous glands in Helix aspersa. Quart. J. micr. Sci. 102, 195–216 (1961)
Conover, R. J.: Assimilation of organic matter by zooplankton. Limnol. Oceanogr. 11, 338–345 (1966)
Cowell, E.: A note on the calcium content of cabbage. Biochem. J. 26, 1422 (1928)
Crossley, D. A.: Radioisotope measurement of food consumption by a leaf beetle species Chrysomela knabi Brown. Ecology 47, 1–8 (1966)
van der Drift, J.: Analysis of the animal community in a beech forest floor. T. Ent. 94, 1–168 (1951)
Grahame, J.: Assimilation efficiency of Littorina littorea (L.) (Gastropoda: Prosobranchiata). J. Anim. Ecol. 42, 383–390 (1973)
Grime, J. P., Blythe, G. M.: An investigation of the relationship between snails and vegetation at the Winnats Pass. J. Ecol. 57, 45–66 (1969)
Grime, J. P., Blythe, G. M., Thornton, J. D.: Food selection by the snail Cepaea nemoralis L. In: A. Watson, Animal populations in relation to their food resources, p. 73–99. Brit. Ecol. Soc. Symp. No. 10. London-Edinburgh: Blackwell 1970
Grime, J. P., MacPherson-Stewart, S. F., Derman, R. S.: An investigation of leaf palatability using Cepaea nemoralis. J. Ecol. 56, 405–420 (1968)
Howes, N. H., Wells, G. P.: The water relations of snails and slugs. I. Weight rhythms in Helix pomatia L. J. exp. Biol. 11, 327–343 (1934)
Howes, N. H., Whellock, R. B.: A semi-synthetic diet for Helix pomatia. Biochem. J. 31, 1489 (1937)
Hunter, P. J.: Studies on slugs of arable ground. III. Feeding habits. Malacologia 6, 391–399 (1968)
Kapur, S. P., Gibson, M. A.: A histochemical study of calcium storage in the foot of the freshwater gastropod, Helisoma duryi eudiscus (Pilsbry). Canad. J. Zool. 46, 987–990 (1968)
Kidson, C., Carr, A. P.: Dune reclamation at Braunton Burrows. Chart. Surv. 93, 298–303 (1960)
Lindquist, B.: Experimentelle Untersuchungen über die Bedeutung einiger Landmollusken für die Zersetzung der Waldstreu. K. Fysiogr. Sallsk. Lund. Forh. 11, 144–156 (1941)
Macfadyen, A.: Methods of investigation of productivity of invertebrates in terrestrial ecosystems. In: K. Petrusewicz, ed., Secondary productivity of terrestrial ecosystems. Principles and methods, p. 383–412. Warszawa-Krakow: Institute of Ecology, Polish Academy of Sciences 1967
Mason, C. F.: Food, feeding rates and assimilation in woodland snails. Oecologia (Berl.) 5, 215–239 (1970)
Myers, F. L., Northcote, D. H.: A survey of the enzymes from the gastrointestinal tract of Helix pomatia. J. exp. Biol. 35, 639–648 (1958)
Paine, R. T.: Energy flow in a natural population of the herbivorous gastropod Tegula funebralis. Limnol. Oceanogr. 16, 86–98 (1971)
Petrusewicz, K., Macfadyen, A.: Productivity of terrestrial animals: principles and methods. IBP Handbook No. 13. Oxford-Edinburgh: Blackwell 1970
Phillipson, J.: A contribution to the feeding biology of Mitopus morio (F). Phalangiida. J. Anim. Ecol. 29, 35–43 (1960)
Phillipson, J.: Secondary productivity in invertebrates reproducing more than once in a lifetime. In: K. Petrusewicz, ed., Secondary productivity in terrestrial ecosystems: principles and methods, p. 459–475. Warszawa-Krakow: Institute of Ecology, Polish Academy of Sciences 1967
Rao, K. P., Goldberg, E. D.: Utilization of dissolved calcium by a pelecypod. J. cell. comp. Physiol. 43, 283–292 (1954)
Reichle, D. E.: Relation of body size to food intake, oxygen consumption and trace element metabolism in forest floor arthropods. Ecology 49, 538–542 (1968)
Richardson, A. M. M.: A study of the energy flux through a natural population of the polymorphic land snail Cepaea nemoralis L. Unpublished Ph. D. thesis, University of Exeter (1972)
Sokal, R. R., Rohlf, F. J.: Biometry. San Francisco: Freeman 1969
Sumner, A. T.: Experiments on phagocytosis and lipid absorption in the alimentary system of Helix. J. roy. micr. Soc. 84, 415–421 (1965a)
Sumner, A. T.: The cytology and histochemistry of the digestive gland cells of Helix. Quart. J. micr. Soc. 106, 173–192 (1965 b)
Wagge, L. E.: Quantitative studies of calcium metabolism of Helix aspersa. J. exp. Zool. 120, 311–342 (1952)
Wagge, L. E., Mittler, T.: Shell regeneration in some British molluscs. Nature (Lond.) 171, 528 (1953)
White, J. J.: Bio-energetics of the woodlouse Tracheoniscus rathkei Brandt in relation to litter decomposition in a deciduous forest. Ecology 49, 694–704 (1968)
Willis, A. J.: Braunton Burrows: the effects on the vegetation of the addition of mineral nutrients to the dune soils. J. Ecol. 51, 353–374 (1963)
Willis, A. J.: The influence of mineral nutrients on the growth of Ammophila arenaria. J. Ecol. 53, 735–745 (1965)
Willis, A. J., Folkes, B. F., Hope-Simpson, J. F., Yemm, E. W.: Braunton Burrows: the dune system and its vegetation. I. J. Ecol. 47, 1–24 (1959a)
Willis, A. J., Folkes, B. F., Hope-Simpson, J. F., Yemm, E. W.: Braunton Burrows: the dune system and its vegetation. II. J. Ecol. 47, 249–288 (1959b)
Willis, A. J., Yemm, E. W.: Braunton Burrows: mineral nutrients status of the dune soils J. Ecol. 49, 377–390 (1961)
Wolda, H., Zweep, A., Schuitema, K. A.: The role of food in the dynamics of populations of the land snail Cepaea nemoralis. Oecologia (Berl.) 7, 361–381 (1971)
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Richardson, A.M.M. Food, feeding rates and assimilation in the land snail Cepaea nemoralis L.. Oecologia 19, 59–70 (1975). https://doi.org/10.1007/BF00377590
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DOI: https://doi.org/10.1007/BF00377590