Weight gain and weight loss of the earthworm Lumbricus terrestris L. at different temperatures and body weights

Abstract The effect of temperature, body weight and resource availability on weight gain, maturation time, mortality and weight loss of juvenile L. terrestris was determined in the laboratory. With L. terrestris fed ad libitum, the optimum temperature for weight gain was 15–17.5°C and weight gain scaled with body weight (W) by W0.41. The age at which incipent male pores appeared ranged from 9.4 weeks (20°C) to 25.7 weeks (7.5°C). The mean weight with incipient male pores and clitellum was 2.3 and 3.2 g (fresh weight), respectively. The mortality increased with increasing temperature. Earthworms deprived of food resources lost more weight at higher temperatures. Calculations based on oxygen requirements, depending on temperature and body weight, closely agreed with the measured rates of weight loss. It is concluded that earthworms deprived of their food resources reduced the costs of living to the maintenance costs, to minimise weight loss and to maximise survival time. Differences in maturation time between field and laboratory studies (more than 1 y vs less than 1 2 y at 10°C, respectively) might be due to different food resource availability. Since the ratio of the potential weight gain to weight loss was significantly greater than 1, it was hypothesized, that slow rates of weight loss during prolonged periods of food resource deprivation and rapid compensation during brief favourable periods are important for the survival of L. terrestris.

[1]  P. Mill.  Physiology of annelids , 1978 .

[2]  Michael J. Reiss,et al.  The allometry of growth and reproduction , 1989 .

[3]  J. Neter,et al.  Applied Linear Regression Models , 1983 .

[4]  S. Nordström.  Growth and Sexual Development of Lumbricids in Southern Sweden , 1976 .

[5]  P. J. Edwards,et al.  Ecotoxicology of earthworms. , 1992 .

[6]  Peter Calow,et al.  Physiological ecology of animals , 1986 .

[7]  O. Daniel.  Population dynamics of lumbricus terrestris L. (oligochaeta:lumbricidae) in a meadow , 1992 .

[8]  U. Boström.  Growth and cocoon production by the earthworm Aporrectodea caliginosa in soil mixed with various plant materials , 1988, Pedobiologia.

[9]  R. Hartenstein,et al.  Production and carrying capacity for the earthworm Lumbricus terrestris in culture , 1983 .

[10]  R. Peters.  The Ecological Implications of Body Size , 1983 .

[11]  U. Bostrom.  Growth of earthworms (Allolobophora caliginosa) in soil mixed with either barley, lucerne or meadow fescue at various stages of decomposition , 1987 .

[12]  U. Bostrom,et al.  Growth of earthworms (Allolobophora caliginosa) fed shoots and roots of barley, meadow fescue and lycerne. Studies in relation to particle size, protein, crude fiber content and toxicity , 1986 .

[13]  Peter Calow,et al.  Physiological Ecology of Animals: An Evolutionary Approach , 1986 .

[14]  M. Bieri,et al.  Sampling of Lumbricus terrestris (Oligochaeta, Lumbricidae) , 1992, Pedobiologia.

[15]  Peter Calow,et al.  Physiological Ecology: An Evolutionary Approach to Resource Use , 1983 .

[16]  J. Satchell,et al.  Production by L umbricus tevrestris (L.). , 1970 .

[17]  R. Hartenstein.  Rate of production and loss of earthworm biomass in relation to species and size , 1984 .

[18]  T. Bolger,et al.  Growth, reproduction and litter and soil consumption by Lumbricus terrestris L. in reclaimed peat , 1984 .

[19]  A. Gutierrez,et al.  A CONCEPTUAL MODEL FOR GROWTH, DEVELOPMENT, AND REPRODUCTION IN THE LADYBIRD BEETLE, HIPPODAMIA CONVERGENS (COLEOPTERA: COCCINELLIDAE) , 1981, The Canadian Entomologist.