Allelopathic effects of extracts fromUlva proliferapowders on the growth ofProrocentrum donghaienseandSkeletonema costatum

Abstract

Harmful algal blooms of the coastal Prorocentrum donghaiense and Skeletonema costatum have been the focus of many studies, primarily due to the devastating effects this alga has had on the aquaculture industry. Prorocentrum donghaiense and Skeletonema costatum are widely distributed in the world. Prorocentrum donghaiense and Skeletonema costatum have caused great economic loss in many countries. Allelopathy is a prevalent natural phenomenon in aquatic ecosystems. The phenomenon of a large number of marine macroalgal proliferation is called ' Green Tide爷. Generally, green tide occurs in spring or summer and end in summer when temperature is high, but sometimes extended to the fall. In recent years, frequency and biomass of green tide are rising totally, it has become a major concern of the international community to marine environmental problems and ecological disasters. Green tide occurs in the south Yellow Sea of China from 2008 to 2012, which bring about significant losses to coastal fisheries, aquaculture and tourism, causing significant impact on the