ACUTE TOXICITY OF HEAVY-METALS FOR BENTHIC EPIPHYTIC FORAMINIFERA PARAROTALIA-SPINIGERA (LECALVEZ) AND INFLUENCE OF SEAWEED-DERIVED DOC

被引：31

作者：

BRESLER, V ^{[1
]}

YANKO, V ^{[1
]}

机构：

[1] TEL AVIV UNIV, GEORGE S WISE FAC LIFE SCI, INST NAT CONSERVAT RES, IL-69978 RAMAT AVIV, ISRAEL

来源：

ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY | 1995年 / 14卷 / 10期

关键词：

EPIPHYTIC FORAMINIFERA; HEAVY METALS; ACUTE TOXICITY; LC50 (24-H); DOC;

D O I：

10.1002/etc.5620141008

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The acute toxicity of cadmium, copper, and mercury to the benthic epiphytic foraminiferan Pararotalia spinigera (Le Calvez) was investigated using seven different vital cytophysiological and cytochemical methods. The ability to enzymatically hydrolyze the fluorogenic substrates fluorescein diacetate or fluorescein dibutyrate was the most sensitive method of LC50 value determination. The LC50 (24-h) values for cadmium, copper, and mercury determined by this assay with fluorescein diacetate was 0.56, 1.4, and 0.07 mu M, respectively. The content of seaweed-derived dissolved organic carbon (DOC), measured by absorbance at 436 nm, produced a dramatic increase of LC50 values for the heavy metals in a dose-dependent manner. ''Intact'' epiphytic foraminifera attached to seaweeds are less sensitive to acute toxicity of cadmium, copper, and mercury than are ''detached'' foraminifera.

引用

页码：1687 / 1695

页数：9

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