Absence of cadmium excretion and high assimilation result in cadmium biomagnification in a wolf spider.
Cd biomagnification in the terrestrial food chain appears to be dependent on the physiological properties of the organisms rather than on their trophic level. Although high Cd body burdens in spiders from the field have been reported many times, experimental verification of the key factors that determine the rate of cadmium accumulation is lacking. We investigated the cadmium assimilation rate in the common wolf spider Pirata piraticus fed with contaminated fruit flies. Spiders were fed for 42 days with contaminated flies, followed by a detoxicification period of 28 days. Every 14 days, a subsample of spiders and flies was taken for Cd determination. It was demonstrated that a high cadmium assimilation (69.5%) and an excretion rate approaching zero resulted in high Cd concentration factors. The results indicate the importance of spiders in cadmium biomagnification along critical pathways.
Hendrickx
Frederik
F
Laboratory of Animal Ecology, Department of Biology, Ghent University, Laboratory of Animal Ecology, K.L. Ledeganckstraat 35, Ghent 9000, Belgium. frederick.hendrickx@rug.ac.be
Maelfait
Jean-Pierre
JP
Langenbick
Francis
F
D000818:Animals; D001822:Body Burden; D002104:Cadmium / Q000493:pharmacokinetics*; D004330:Drosophila / Q000737:chemistry; D004785:Environmental Pollutants / Q000493:pharmacokinetics*; D020387:Food Chain; D005506:Food Contamination; D013112:Spiders / Q000737:chemistry / Q000502:physiology*; D014018:Tissue Distribution
D004785:Environmental Pollutants; D002104:Cadmium