Acclimation to low level exposure of copper in Bufo arenarum embryos: linkage of effects to tissue residues.
The acclimation possibilities to copper in Bufo arenarum embryos was evaluated by means of three different low level copper exposure conditions during 14 days. By the end of the acclimation period the copper content in control embryos was 1.04 +/- 0.09 microg g(-1) (wet weight) while in all the acclimated embryos a reduction of about 25% of copper was found. Thus copper content could be considered as a biomarker of low level exposure conditions. Batches of 10 embryos (by triplicate) from each acclimation condition were challenged with three different toxic concentrations of copper. As a general pattern, the acclimation protocol to copper exerted a transient beneficial effect on the survival of the Bufo arenarum embryos. The acclimation phenomenon could be related to the selection of pollution tolerant organisms within an adaptive process and therefore the persistence of information within an ecological system following a toxicological stressor.
Herkovits
Jorge
J
Programa de Seguridad Química, Instituto de Ciencias Ambientales y Salud (ICAS), Fundación PROSAMA, Buenos Aires, Argentina. herkovit@mail.retina.ar
Pérez-Coll
Cristina Silvia
CS
D000222:Adaptation, Physiological; D000663:Amphibians; D000818:Animals; D001001:Anura; D015415:Biomarkers; D002022:Bufo arenarum; D003300:Copper / Q000633:toxicity*; D004625:Embryo, Nonmammalian / Q000187:drug effects*; D004781:Environmental Exposure / Q000009:adverse effects*; D004787:Environmental Pollution / Q000009:adverse effects*; D014022:Tissue Survival; D015032:Zinc / Q000633:toxicity
D015415:Biomarkers; D003300:Copper; D015032:Zinc