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研究论文

The effects of the dinoflagellate of Alexandrium tamarense on early development of Chlamys farreri

基金项目：国家自然科学基金(39950001;49576301;20177O₂3;49906007);山东省科技攻关专项;中国科学院知识创新工程(KZCX2206);院长基金;国家重点基础研究项目2001CB409709

摘要：塔玛亚历山大藻Alexandriumtamarense(藻株ATHK)能抑制栉孔扇贝Chlamysfarreri受精卵的孵化和早期D型幼虫的存活.实验发现,暴露于密度为100和500cellsmL的塔玛亚历山大藻中,36h后,扇贝受精卵的孵化率分别为对照组的30%和5%.在实验范围内,三角褐指藻和赤潮异弯藻对受精卵孵化无影响,而另一塔玛亚历山大藻藻株ATCI02对受精卵孵化有显著影响.指数生长前期时的藻对受精卵的毒性最大.原肠期之前各阶段的胚胎对塔玛亚历山大藻毒性最敏感.在密度为3000cellsmL以上的塔玛亚历山大藻中,早期D型幼虫存活和活力开始显著下降,在密度为5000cellsmL藻中暴露20d或10000cells/mL藻中暴露14d后,D型幼虫的存活率为0.塔玛亚历山大藻产生的毒性物质为非PSP毒素的一类未知毒素

Abstract：The inhibition of the dinoflagellate Alexandrium tamarense on the fereilized egg hatching success and larval survival of the scallop(Chlamys ferreri) was studied. The hatching rate of C. farreri was only 30 when the fertilized eggs were exposed for 36 hours to A. tamarense cells at a concentration of 100 cells/mL, and further dropped to 5 with the concentration of 500cells/mL. There was no such effects when the fertilized scallop eggs exposed to other two algal species, the diatom Phaeodactylum tricornutum and raphidophyte Heterosigma carterae. The alga at early exponential stage had the strongest effect on egg hatching and algal toxin(s) influenced the developmental stage before blastula most sensitively. The alga also deliriously influenced the larvae at early D shape stage of the scallop. The survival rate began to decrease significantly after exposed for 6 days at concentration of 3000cells/mL and above; no larvae could survive after 14 day exposure to A. tamarense at 10000cells/mL or 20 day at 5000cells/mL. As PSP is an internal toxin of algal cells and algal cells are un able to be ingested at these stages of the scallop,thus the experimental results indicated that there may be produced novel substances other than PSP from A. tamarense.