Gorbi G, Corradi M G, Torelli A, Bassi M
Department of Environmental Sciences, University of Parma, Italy.
Ecotoxicol Environ Saf. 1996 Nov;35(2):109-11. doi: 10.1006/eesa.1996.0089.
A normal (S2-N) and a Cr-tolerant (S2-T) strain of Scenedesmus acutus, grown in Cr-free medium or in the presence of 1, 5, or 10 mg/liter Cr(VI), were fed to Daphnia magna. An increase of growth and fecundity was observed in the daphnids when the algae had undergone an increase of dry mass following Cr treatment, which happened in S2-N in the presence of 1 mg/liter and in S2-T in the presence of 5 mg/liter. When the algae were pretreated with 10 mg/liter, growth and fecundity were reduced in the daphnids fed on S2-N, but remained normal in the daphnids fed on S2-T. It is concluded that the tolerant strain remains a good food source even if grown in the presence of a Cr concentration that reduces the nutritional value of the normal strain.
将在无铬培养基中或在含有1、5或10毫克/升六价铬的环境中培养的尖针栅藻的一个正常菌株（S2-N）和一个耐铬菌株（S2-T）投喂给大型溞。当藻类在铬处理后干质量增加时，大型溞的生长和繁殖力出现增加，这种情况在1毫克/升铬存在时的S2-N菌株以及5毫克/升铬存在时的S2-T菌株中发生。当藻类用10毫克/升铬预处理时，以S2-N菌株为食的大型溞的生长和繁殖力降低，但以S2-T菌株为食的大型溞的生长和繁殖力仍保持正常。得出的结论是，即使在存在降低正常菌株营养价值的铬浓度的环境中生长，耐铬菌株仍是良好的食物来源。
