말똥성게(Hemicentrotus pulcherrimus)의 수정 및 배아 발생률에 대한 비소와 크롬의 독성영향
Toxic Effects of Arsenic and Chromium on the Fertilization and Embryo Development Rates in the Sea Urchin (Hemicentrotus pulcherrimus)
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Toxic effects of arsenic (As) and chromium (Cr) has been investigated using the sea urchin (Hemicentrotus pulcherrimus) germ cell and pluteus-larvae. The gametotoxic and embryotoxic effects of As and Cr on H. plucherrimus were each investigated at 6.25, 12.5, 25, 50, 100. Spawning was induced by 0.5 M KCl solution and the normal fertilization and embryogenesis rates were performed for 10 min and 64 hrs after fertilization, respectively. The normal fertilization and embryogenesis rates in the control condition (not including As and Cr) were greater than 94% and 93%, respectively. The fertilization rate was not significantly changed compared with control but embryogenesis rate was significantly decreased with concentration-dependent manner. As and Cr reduced normal embryogenesis rates and a significant reduction occurred at concentration greater than 6.25 ppb (P⁄0.01) and 25 ppb (P⁄0.05), respectively. The lowest-observedeffect-concentration (LOEC) of normal embryogenesis rate in As and Cr were each 6.25 and 25ppb, respectively. From these results, normal embryogenesis rate of H. pulcherrimus have toxic effect at greater than the 6.25 ppb concentration of As and 25 ppb concentration of Cr in marine ecosystems. These results suggest that the normal embryogenesis rates of H. pulcherrimus are very useful test method for the toxicity assessment of heavy metal as As and Cr in marine ecosystems.
Abstract
Toxic effects of arsenic (As) and chromium (Cr) has been investigated using the sea urchin (Hemicentrotus pulcherrimus) germ cell and pluteus-larvae. The gametotoxic and embryotoxic effects of As and Cr on H. plucherrimus were each investigated at 6.25, 12.5, 25, 50, 100. Spawning was induced by 0.5 M KCl solution and the normal fertilization and embryogenesis rates were performed for 10 min and 64 hrs after fertilization, respectively. The normal fertilization and embryogenesis rates in the control condition (not including As and Cr) were greater than 94% and 93%, respectively. The fertilization rate was not significantly changed compared with control but embryogenesis rate was significantly decreased with concentration-dependent manner. As and Cr reduced normal embryogenesis rates and a significant reduction occurred at concentration greater than 6.25 ppb (P⁄0.01) and 25 ppb (P⁄0.05), respectively. The lowest-observedeffect-concentration (LOEC) of normal embryogenesis rate in As and Cr were each 6.25 and 25ppb, respectively. From these results, normal embryogenesis rate of H. pulcherrimus have toxic effect at greater than the 6.25 ppb concentration of As and 25 ppb concentration of Cr in marine ecosystems. These results suggest that the normal embryogenesis rates of H. pulcherrimus are very useful test method for the toxicity assessment of heavy metal as As and Cr in marine ecosystems.
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