CAJ | 학술논문

赤潮消长显著影响海洋中有色可溶性有机物(CDOM)的变化.赤潮异弯藻(Heterosigma akashiwo)是一种常发的鱼毒性赤潮种类,是产生CDOM较显著的种类.本文以赤潮异弯藻CDOM为研究对象,分析了CDOM在种群消长中的变化特征,研究了光对赤潮异弯藻CDOM组成物质变化的影响,并就此变化对其他微藻种群生长造成的影响进行了定量研究.结果表明:(1)以紫外吸收的定量变化为指标,赤潮异弯藻CDOM的量与种群消长呈互逆相关:种群密度增加, CDOM降低;种群密度降低, CDOM增加;长期培养种群中, CDOM含量增加.(2)光对该藻产生的CDOM物质组成和定量有显著影响,紫外照射能显著漂白CDOM,类腐殖质和腐殖酸降解明显.(3)该藻CDOM变化影响其他微藻种群生长:CDOM显著促进微小卡罗藻(Karlodinium micrum)、小硅藻(Nitzschia closterium f. minutissima)的种群生长,受光降解后对小硅藻的促进作用降低,但对微小卡罗藻的促进作用不变; CDOM 抑制海洋原甲藻(Prorocenturm micans)种群生长,光降解后,其抑制作用降低.赤潮异弯藻赤潮产生的大量且稳定的CDOM可以影响海洋微型生物群落结构.
적조소장현저영향해양중유색가용성유궤물(CDOM)적변화.적조이만조(Heterosigma akashiwo)시일충상발적어독성적조충류,시산생CDOM교현저적충류.본문이적조이만조CDOM위연구대상,분석료CDOM재충군소장중적변화특정,연구료광대적조이만조CDOM조성물질변화적영향,병취차변화대기타미조충군생장조성적영향진행료정량연구.결과표명:(1)이자외흡수적정량변화위지표,적조이만조CDOM적량여충군소장정호역상관:충군밀도증가, CDOM강저;충군밀도강저, CDOM증가;장기배양충군중, CDOM함량증가.(2)광대해조산생적CDOM물질조성화정량유현저영향,자외조사능현저표백CDOM,류부식질화부식산강해명현.(3)해조CDOM변화영향기타미조충군생장:CDOM현저촉진미소잡라조(Karlodinium micrum)、소규조(Nitzschia closterium f. minutissima)적충군생장,수광강해후대소규조적촉진작용강저,단대미소잡라조적촉진작용불변; CDOM 억제해양원갑조(Prorocenturm micans)충군생장,광강해후,기억제작용강저.적조이만조적조산생적대량차은정적CDOM가이영향해양미형생물군락결구.
The initiation and collapse of red tide will induce changes of chromophoric dissolved organic matter (CDOM), which may potentially affect the community structure of marine organisms. Heterosigma akashiwo (Hada) is one of common red tide species, with ichthyotoxicities, and production of CDOM. In this study, the chemical characteristics of CDOM from H. akashiwo have been analyzed along with its population growth cycle, as well as the various light source treatments. The effects of CDOM on different microalgae have been also quantified. The results showed that (1) the production of CDOM is inversely correlated with the population growth, namely, in-crease of microalgal density accompanied by decrease of CDOM content, vice versa. The production of CDOM is continually increased in the maintenance of high density population. (2) The light irradiation affected content and composition of CDOM significantly, resulting in large degradation of humic substances by UV. (3) CDOM affected the growth of microalgae depending on the species. Stimulating effects were observed on Karlodinium micrum and Nitzschia closterium f. minutissima, and inhibitory effects on Prorocenturm micans. Such effects will be decreased for the CDOM after UV treatment. In conclusion, H. akashiwo, especially at large population, can affect the water qualities and phytoplankton community structures through the production of extracellular chromophoric dissolved organic matter.