Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 356301
Title Effects of earthworms density on growth, development and reproduction in Lumbricus rubellus (Hoffm.) and possible consequences for the intrinsic rate of population increase
Author(s) Klok, C.
Source Soil Biology and Biochemistry 39 (2007)9. - ISSN 0038-0717 - p. 2401 - 2407.
Department(s) Centre for Ecosystem Studies
Wageningen Environmental Research
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) burrow systems - oligochaeta - dynamics - soil - organisms - culture - cores
Abstract In this paper, the influence of earthworm density is assessed on the life-history parameters: growth, development, reproduction, and survival of Lumbricus rubellus (Hoffm.). Density ranges from two to nine earthworms in 1-1 containers, corresponding to field densities of 300-1350 earthworms m(-2). Earthworms were kept under optimal laboratory conditions, with a surplus of food. The results show that at high earthworm density, individual growth is retarded, maturation delayed and cocoon production decreased, even when food is optimal. The integration of these results into a Dynamic Energy Budget model suggests that the food intake of individual earthworms is lower at the higher tested densities. This lower food intake is most probably driven by competition for space at the higher densities. The lower food intake results in a lower intrinsic rate of population increase which is negative at the highest tested density. (C) 2007 Elsevier Ltd. All rights reserved.
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