INVESTIGADORES
HERKOVITS Jorge
artículos
Título:
Acclimation to Low Level Exposure of Copper in Bufo arenarum Embryos: Linkage of Effects to Tissue Residues
Autor/es:
JORGE HERKOVITS; CRISTINA SILVIA PÉREZ-COLL
Revista:
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
Editorial:
MOLECULAR DIVERSITY PRESERVATION INTERNATIONAL-MDPI
Referencias:
Año: 2007 vol. 2 p. 166 - 172
ISSN:
1660-4601
Resumen:
Bufo arenarum embryos were treated with three different low level copper exposure conditions during 14 days. The treatments started with 40, 115 and 190 ng Cu2+/L for each group and concentrations were gradually increased up to 270, 350 and 420 ng Cu2+/L respectively. By the end of the acclimation period the copper content in control embryos was 1,04 ± 0,09 µg/g (wet weight) while in all the acclimated embryos a reduction of about 25% of  copper was found.  The acclimated embryos were challenged to three lethal copper concentrations resulting in a transient but in some cases significant increase in embryo survival. The lower content of copper in the acclimated embryos points out the possibility of a homeostatic mechanism for the copper itself and could be associated with the higher resistance of these embryos to lethal concentrations of copper. The acclimation phenomenon could enhance the selection of pollution tolerant organisms within an adaptive process and therefore the persistence of information within an ecological system following a toxicological stressor.