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Genetic adaptation to metal stress by natural populations of Daphnia longispina
Lopes, Isabel; Baird, Donald J.; Ribeiro, RuiLoss of genetic diversity in natural populations as a result of chemical contamination has been reported in some studies. Here, four field populations of Daphnia longispina, two from sites historically impacted by acid mine drainage (AMD) and two from reference sites, were used to address four objectives: (1) identify differences in sensitivity between the stressed and reference populations; (2) distinguish bet...
Resistance to metal contamination by historically-stressed populations of Cerio...
Lopes, Isabel; Baird, Donald J.; Ribeiro, RuiField populations of daphnids historically-stressed by metal contamination may show increased resistance to those contaminants. This study was undertaken aiming to confirm/infirm three main hypotheses: (1) field populations living in historically-impacted environments are more tolerant to metal stress than populations from reference sites; (2) resistance differences are genetically-determined, i.e., differences...
The daphnia bioassay - a critique
Baird, Donald J.; Barber, Ian; Bradley, Mairead; Calow, Peter; Soares, AmadeuDaphnia magna is used widely as a standard ecotoxicological indicator organism, and protocols exist for its use in assessing the toxicity of substances under acute and chronic experimental conditions. Problems exist in repeatability of such bioassays between laboratories. Sources of variation are identified using a simple quantitative genetics model. Presenting specific examples, we conclude that these problems...
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