【摘要】 2004年2月9~10日在胶州湾发生的柔弱几内亚藻(Guinardia delicatula)赤潮期间分别在3个典型赤潮站位采集表层水样,利用过滤(0.7μm)和切向超滤(1000Daltons)分离赤潮暴发水体中的胶体物质,分析了不同滤液及截留液的有机碳含量,并将赤潮异弯藻(Heterosigma akashiwo)和中肋骨条藻(Skeletonema costatum)在<1000Daltons的超滤液及具有不同含量胶体物质(1000Daltons~0.7μm)的截留液中进行培养。结果发现在发生柔弱几内亚藻赤潮期间水体中的溶解有机碳浓度会增加,特别是胶体有机碳浓度会成倍增长;在不同胶体含量海水中培养的赤潮异弯藻的最大生长率μmax和最大生物量Bf与对照组相比会随着胶体含量的增加而显著增大,而中肋骨条藻的最大生长率μmax和最大生物量Bf与对照组相比会随着胶体含量增加而显著降低,表明柔弱几内亚藻赤潮水体中的胶体物质对赤潮异弯藻的生长起促进作用,而对中肋骨条藻的生长起抑制作用。这说明柔弱几内亚藻在增殖过程中所产生的胶体物质具有他感作用,会影响其它微藻的生长,从而可能对柔弱几内亚藻赤潮的形成起重要作用。更多还原

【Abstract】 Surface water was sampled at the three red tide stations during the Guinardia delicatula bloom in Jiaozhou Bay on February 9th-10th,2004 and the colloidal substances were separated by filtration(0.7μm)and cross-flow ultrafiltration(1000 Daltons).The organic carbon in the filtrates and retentates were analyzed respectively.Heterosigma akashiwo and Skeletonema costatum were cultured in the <1000Daltons ultrafiltrate and the retentates with different amount of colloidal substances(1000 Daltons-0.7μm).The results show that the dissolved organic carbon concentration is enhanced in the water,especially the colloidal organic carbon is increased severalfold during the Guinardia delicatula bloom.Compared with the controls,the maximum growth rate μmax and maxium biomass Bf of the Heterosigma akashiwo cultured in the retentates increase markedly with the colloid amout increase,but those of the Skeletonema costatum decrease remarkably with the colloid amout increase.It indicates that the colloidal substances in Guinardia delicatula bloom water can enhance the growth of Heterosigma akashiwo but suppress the growth of Skeletonema costatum.This phenomenon implies that Guinardia delicatula is able to produce colloid size allelopathic substances during the algal proliferation.These substances could influence other algal growth,which maybe play an important role in the Guinardia delicatula bloom formation.更多还原