STAGE DEPENDENT SUSCEPTIBILITY TO LEAD IN BUFO-ARENARUM EMBRYOS

被引：47
作者：
PEREZCOLL, CS
HERKOVITS, J
机构：
[1] Instituto de Biología de la Reproducción y Desarrollo Embrionario, Universidad Nacional de Lomas de Zamora, 1832 Lomas de Zamora (B)
来源：
ENVIRONMENTAL POLLUTION | 1990年 / 63卷 / 03期
关键词：
D O I：
10.1016/0269-7491(90)90157-8
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The stage dependent susceptibility to lead in amphibian development was studied by exposing Bufo arenarum embryos during neurulae, neuromuscular activity and gill circulation stages for twenty hours to 1 ppm Pb2+. Survival, malformations and behavioral disorders were evaluated. The embryonic susceptibility to lead was markedly stage dependent. The survival at the neuromuscular activity stage was approximately half that of the other two periods; concerning malformations, the gill circulation stage was the least sensitive. The observed malformations consisted of failed closure of neural tube, hydropsy, small and cylindered tails, reduced body size and incurvations in the body axis. Some alterations occurred in all experimental groups and therefore were considered non-dependent on the period of treatment. In all experimental embryos, neurological disorders such as trembles and loss of equilibrium were observed. © 1990.
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页码：239 / 245
页数：7
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