东海1972年一次毛丝藻赤潮的分析

1972年8月至11月于东海北部(30°N—32°N,127°E以西)部分海域中所出现的赤潮是由蓝藻门中的三种毛丝藻组成,即(1)汉氏毛丝藻 Trichodesmium Hildebrandtii Gomont(2)薛氏毛丝藻 Trichodesmium Thiebautii Gomont(3)红毛丝藻 Trichodesmium erythraeum Ehr.。其中汉氏毛丝藻为优势种。这次赤潮主要形成于长江口以东外海,9月份后虽扩大分布区,但仍以东部海区最密集。11月后逐渐消失。此次赤潮最明显的危害表现在对饵料基础的破坏上,它能引起鲐、鲹鱼索饵渔场位置的改变和洄游路线的变化,从而促成减产。经分析,此次形成赤潮的原因主要是由于由该年夏季气旋而引起的涌升流和连续的强台风等因素的综合作用结果。以使上、下层搅拌剧烈,营养盐充分溶于水中增加了肥沃度。加上秋季水温偏高和高温水体的出现,也为热带性藻类繁殖提供了有利条件。本文作者建议,今后随着现代工业的发展,应加强对海洋污染和赤潮预报的研究。

ANALYSIS OF THE RED TIDE OF TRICHDDESMIUM IN DUNG HAI OF CHINA IN THE YEAR 1972

this paper deals with analysis of the red tide of Triclodesrzi in Dong Hai of China.,1972. The red tide was caused by species of Cyanaphyres,eviz Trclaadsm.iwmhiTdedti Gomant, Trichodesmium thibau.ii CTomont, Trirh.octesmizm tryh.PaumEhr. The dominant species was Tricociesmium hiZdehrrrrcitiz Clvruont. Intensive redtide was found in the area of in August AfterSeptember the area of distrivutivn of red tide expanded, and the center still is locs,tedin the same place. The located area was the food base of machercis, scads and. otherfish was damaged obviously by the red tide. The hioms of zoaplankton was decreasedrapidly and the migration route of mackerels and scsds was shifted, Thonlrh death offish did not happen, the red tide caused heavy drop of catch of m;ickere.ls and scalds,and in August no fish has been caught, The uptvelling eused by stronger cyeloniv vortex in summer 1972 arid continue-ing strong typhoons were nia,jvr factors for the formation of the red tide Besides, theappearance of high temperature in water provided favourtble condition for the bloomingof these tropical algae.