US EPA

664683 

Journal Article 

Influence of genetic and environmental factors on the tolerance of Daphnia magna Straus to essential and non-essential metals 

Barata, C; Baird, DJ; Markich, SJ 

1998 

Yes 

Aquatic Toxicology
ISSN: 0166-445X
EISSN: 1879-1514 

BIOSIS/98/20555 

42 

2 

115-137 

eng 

WOS:000073903900003 

BIOSIS COPYRIGHT: BIOL ABS. The ultimate aim of ecotoxicological studies is to predict how natural populations respond to contaminant exposure. Thus, it is crucial to understand how genetic and environmental factors in the field modify responses measured in the laboratory. In the present study the authors determine the genetic and environmental components of variability in acute responses among four Daphnia magna clones exposed to both essential (Zn and Cu) and non-essential (Cd and U) metals in waters with varying water hardness. The authors postulate that genotype acute responses to physiologically non-essential metals may be more variable than responses to essential metals and that this may be explained by hypothesizing that acute responses to non-essential substances are subject to intermittent selection (since the substances may not always be present in biologically significant amounts), whereas responses to essential substances are subject to continuous directional selection (since essential 

Animals genetics; Minerals; Poisoning; Animals; laboratory; Environmental pollutants poisoning; Occupational diseases; Anatomy; comparative; Animal; Crustacea; physiology; Pathology; 7440-66-6; 7440-61-1; 7440-50-8; 7440-43-9