Author/Editor		Kaschl, Ulf Iskender; Zidar, Primož; Štrus, Jasna; Storch, Volker
Title		Food choice experiments with cadmium nitrate dosed food in terrestrial isopod Oniscus asellus (Crustacea)
Type		članek
Source		Acta Biol Slov
Vol. and No.		Letnik 45, št. 2
Publication year		2002
Volume		str. 3-14
Language		eng
Abstract		The influence of different concentrations of cadmium nitrate on food choice behaviour was studied in the terrestrial isopod Oniscus asellus: In paired food chaice tests, consumption rates were compared in relation to cadmium nitrate concentrations and duration of feeding. The consumption of contaminated, food was reduced at even the lowest cadmium concentration already in the first week of feeding. In the third week the consumption rates for uncontaminated and contaminated food reached a ratio of 6:4 in all animal groups. Consumption of contaminated food during the experiment resulted in increased cadmium content in the animals. It is presumed that O. asellus cannot distinguish food aocording to cadmium concentration. The difference in consumption rates between uncontaminated and cadmium-contaminated food could be based on integration of feeding behaviour and the adverse metabolic effects of cadmium.
Summary		Proučevali smo vpliv različnih koncentracij hrani dodanega kadmijevega nitrata na izbiro hrane pri kopenskem enakonožcu Oniscus asellus. V poskusih izbire smo primerjali stopnjo hranjenja z neonesnaženo in onesnaženo hrano, v odvisnosti od koncentracije kadmijevega nitrata in trajanja hranjenja. Živali so zaužile manj onesnažene hrane že v prvem tednu poskusa izbire tudi pri najnižji koncentraciji kadmijevega nitrata dodanega hrani. V tretjem tednu poskusa je bilo pri vseh skupinah živali razmerje med stopnjo hranjenja z neonesnaženo in onesnaženo hrano 6:4. Pri živalih, ki so med poskusom jedle hrano z dodanim kadmijevim nitratom je bila telesna vsebnost kadmija povečana. Iz rezultatov sklepamo, da raki enakonožci verjetno ne razlikujejo med hrano z različno vsebnostjo kadmijevega nitrata. Razlike v stopnji hranjenja z neonesnaženo in onesnaženo hrano so verjetno posledica prehranjevalnega vedenja živali povezanega s presnovnimi učinki kadmija.
Descriptors		FOOD CONTAMINATION CADMIUM COMPOUNDS FEEDING BEHAVIOR CADMIUM SOIL CRUSTACEA