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 321108
Title Quantifying copper and cadmium impacts on intrinsic rate of population increase in the terrestrial oligochaete lumbricus rubellus
Author(s) Spurgeon, D.J.; Svendsen, C.; Weeks, J.M.; Hankard, P.K.; Stubberud, H.E.; Kammenga, J.E.
Source Environmental Toxicology and Chemistry 22 (2003)7. - ISSN 0730-7268 - p. 1465 - 1472.
Department(s) Laboratory of Nematology
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) earthworm eisenia-foetida - phenotypic plasticity - toxicity test - life-history - heavy-metals - reproduction - fitness - soil - growth - stress
Abstract Demographic methods can translate toxicant effects on individuals into consequences for populations. To date few such studies have been conducted with longer-lived invertebrates. This is because full life-cycle experiments are difficult with such species. Here we report the effects of copper and cadmium on the key demographic parameter intrinsic rate of population increase (r) in a long-lived invertebrate (an earthworm). The approach used to derive r was based on robust measurement of effects oil life-cycle traits in three specifically designed toxicity tests and integration of this data within a demographic model. The three laboratory tests used to generate values for specific life-cycle parameters under copper and cadmium exposure were suited to the task. Significant effects on a range of separate adult and juvenile life-cycle parameters were seen. Integration of parameter values within the demographic equation indicated that for copper, r was reduced only at a concentration that also caused adult mortality. For cadmium. a more graded exposure-dependent effect on fitness was seen. with r reduced at sublethal concentrations. The concentration response patterns for r found for the two metals suggest significantly different consequences for earthworm populations exposed to sublethal levels of copper and cadmium.
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