Cr<sup>6+</sup>对海湾扇贝早期发育的影响

匡世焕; 张福绥

Cr⁶⁺对海湾扇贝早期发育的影响

中国科学院海洋研究所, 青岛

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出版历程
- 收稿日期: 1994-06-05
- 修回日期: 1995-04-20

摘要

摘要: 在温度为23℃和盐度为31.6的海水条件下系统地研究了六价铬离子(Cr⁶⁺)对海湾扇贝Argopecten irradians胚胎和不同发育阶段的幼虫的影响.海湾扇贝胚胎、早期D形幼虫、壳顶幼虫和眼点幼虫对Cr⁶⁺的敏感性各不相同.Cr⁶⁺对胚胎孵化的半数影响浓度(48h)EC₅₀为2610μg/dm³;对早期D形幼虫和壳顶幼虫48h的半致死浓度LC₅₀分别为3890和2400μg/dm³.眼点幼虫在变态的过程中对Cr⁶⁺尤为敏感:小于200μg/dm³的Cr⁶⁺对眼点幼虫的变态有不正常的刺激作用;大于这一浓度的Cr⁶⁺对其变态则有抑制作用.因此,其敏感性大小依次为:变态期眼点幼虫>壳顶幼虫>胚胎>D形幼虫.被Cr⁶⁺污染的饵料(等鞭金藻Isochrysis galbana)亦可对海湾扇贝幼虫产生毒性影响,说明Cr⁶⁺的毒性可通过食物链传递.慢性毒性实验表明:Cr⁶⁺对海湾扇贝幼虫的生长发育具有明显的抑制作用,AAS法分析结果显示:Cr⁶⁺在D形幼虫体内的累积随着外界Cr⁶⁺浓度的升高而增多.根据研究结果提出海湾扇贝人工育苗过程中水质控制Cr⁶⁺浓度应低于10μg/dm³.
- Cr⁶⁺ /
- 海湾扇贝 /
- 胚胎 /
- 幼虫 /
- 毒性影响

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