The growth responses of Heterosigma akashiwo

Skeletonema costatum and Alexandrium tamarense to three kinds of polycyclic aromatic hydrocarbons treatment was studied by experimental ecology methods.The results showed that lower concentration of phenanthrene

pyrene and anthracene could stimulate the growth of Heterosigma akashiwo

Skeletonema costatum and Alexandrium tamarense

while higher concentration of phenanthrene

pyrene and anthracene exhibited inhibition to growth of three species of red tide microalgae. The 96 h EC

50

values of phenanthrene

pyrene and anthracene treatments to Heterosigma akashiw were 0.059

0.071 and 0.078 mg/L

the 96 h EC

50

values to Skeletonema costatum were 0.079

0.097 and 0.112 mg/L

and those to Alexandrium tamarense were 0.089

0.107 and 0.119 mg/L

respectively.When three species of red tide microalgae were exposed to 0.3 J/m

2

UV-B radiation and three kinds of polycyclic aromatic hydrocarbons together

the growth of Heterosigma akashiwo

Skeletonema costatum and Alexandrium tamarense was heavily inhibited by phenanthrene

pyrene and anthracene more significantly.