Assimilation and loss of109Cd and65Zn by the terrestrial isopodsOniscus asellus andPorcellio scaber

The Influence of Zinc on the Uptake and Loss of Cadmium and Lead in the Woodlouse, Porcellio scaber (Isopoda, Oniscidea)

“…These results are supported by data from Hopkin (1990a) and Hames and Hopkin (1991b) where P. scaber, contaminated with zinc and cadmium, demonstrated a loss of cadmium when feeding on clean food. Donker (1992) found a negative correlation between cadmium and zinc in the hepatopancreas.…”

“…But the ability of P. scaber to excrete zinc varies. Contaminated animals feeding on uncontaminated litter exhibited no loss of zinc (Hopkin, 1990a;Donker et al, 1996) or excreted zinc to various degrees (Hames and Hopkin, 1991b;Bibic et al, 1997). Assuming that zinc can be excreted from B cells or the rest of the body, no elimination is detected when it is stored only in S cells.…”

“…This hypothesis has been con"rmed in several papers (Hopkin et al, 1989b;Hopkin, 1990b;Witzel, 1998). But nevertheless in some studies the animals were able to excrete this metal (Hopkin, 1990a;Hames and Hopkin, 1991b). A consistent explanation of this e!ect is so far lacking.…”

Lead and Cadmium in Soil and Isopoda Woodlice in Croatia

“…Woodlice as representatives of the saprophagous soil macrofauna were studied from various aspects: heavy metal accumulation in laboratory conditions (GraK ! et al, 1997;Witzel, 1998;Hames and Hopkin, 1991;Bibic\ et al, 1997, metal toxicity (Joosse et al, 1981, 1983Crommentuijn et al, 1994;Drobne and Hopkin, 1995;Drobne and Strus, 1996;Abdellateif et al, 1998;Coenen-Stass, 1998;Knigge and KoK hler 2000); or incidence in extremely contaminated environment (Hopkin and Hames, 1994;Rabitsch, 1995). Some of the studies monitored woodlice in extremely contaminated area like smelters and mines (Grelle et al, 2000;Rabitsch, 1995;Hopkin and Hames, 1994); the others were performed under laboratory conditions.…”

Content, absorption quantities and intracellular storage sites of heavy metals in Diplopoda (Arthropoda)

“…In some hepatopancreatic cells of isopods (B cells) and spiders this way of heavy metal excretion is common (Hames 1989, Hopkin 1989. Since these 'metal excretion processes' are--similar to metal uptake and resorption--quantitatively not identical in different animal species, the metal contents of organs can differ between sometimes even closely related species (Hames & Hopkin 1991). Thus, in the present study, average metal contents were always less in L. belgicus than in G. marginata.…”