大连湾海域赤潮异弯藻(Heterosigma akashiwo)赤潮及其生态特征

1985~1987年夏季,大连湾发现国内首次记录赤潮种——赤潮异弯藻(Heterosigma akashiwo)赤潮。本文记述了该种赤潮时的适宜生态特征,并指出大连湾海域富营养化及有机污染程度。为控制沿岸排污和深入研究该种赤潮机制提出依据。 

The Heterosigma Akashiwo Red Tide and Ecological Characteristics in Dalian Bight

The result of research in Dalian Bight coast water in 1985-1987 showed that the red tide in Dalian Bight coast water during June to July was caused by Heter-osigma akashiwo. The species is a first record species in China. The red tide caused by this specie generally occured in little-tide-days. The other suitale conditions of the red tide include the water temperature 21-23℃ after-rain、 low salinity ( 18 ‰-30‰) and definite ligh-altering. When the red tide broke out, the water-color rose and transparency reduced. In the meantime, dissolved-oxigen、 the SS and pH increased at all, and COD values had a positive relavant to the standing crops of Heter-osigma akashiwa.Because of discharging industrial waste and resident waste into Dalian Bight are large in quantity, there exists in eutrophicated state over a long period of time in Dalian Bight, and the level of organic pollution is of middle-hight.Therefore, N、 P、 Fe and Mn etc. are enriched and this species grows to a large number. Thus, the control of discharging waste water is necessery.