铬对水栖寡毛类赫德莱顠体虫（Aeolosomaheadleyi）的毒性试验

TOXICITY OF CHROMIUM TO AN AQUATIC OLIGOCHAETE AEOLOSOMA HEADLEYI

赫德莱顠体虫（Ａｅｏｌｏｓｏｍａｈｅａｄｌｅｙｉ）为一种小型木栖寡毛类，行无性繁殖，室内培养容易。铬对其急性毒性试验结果为：２４ｈＬＣ＿（５０）为３．５５（３．１６─３．９０）ｍｇ／Ｌ，４８ｈＬＣ＿（５０）为１．８８（１．７７─２．０１）ｍｇ／Ｌ。低浓度慢性试验结果为：无效应浓度（ＮＯＥＣ）为１０１μｇ／Ｌ最大可接受浓度（ＭＡＥＣ）为１０１─１０２μｇ／Ｌ慢性暴露１０ｄ后种群可恢复的最高浓度为２１０ｕｇ／Ｌ．对此种寡毛类作为毒性试验生物的可能性作了简短的讨论。

Aeolosoma headleyi, a small aquatic oligochaete with asexual reproduction was used to test the toxicity of Cr￣(6+). In acute toxic test, 24h LC_(50) was 3. 55 (3. 16- 3. 90) mg/L, 48h LC_(50)was 1. 88 (1. 77- 2. 01) mg/L, respectively. Chronic toxic test in low concentration growth was 101 mg/L, MAEC (maximum acceptable effect concentration) was 101- 210 mg/L.The highest concentration in which the population growth could be recovered after 10 days exposure was 210 mg/L. A brief discussion on the possibility of this oligochaete to be used as bioassay organism was given.