A benthic harmful dinoflagellate bloom caused by Prorocentrum concavum occurred at Xincun Bay, a lagoon characterized by a tropical seagrass ecosystem in the southern China, in summer 2018. Both abiotic and biotic factors may affect the abundance dy- namics of P. concavum. One of the biotic factors, allelopathy, is known to be especially common among aquatic species and is sug- gested to be an economical and environmentally-friendly way to eliminate Benthic Harmful Algal Blooms (BHABs). To investigate the possible allelopathic interactions between seagrasses and P. concavum, a field survey was conducted to study the cell densities of P. concavum on four major substrates over 12 months. In laboratory, fresh Enhalus acoroides leaves and a crude aqueous extract of dry E. acoroides leaves were added to the culture of P. concavum respectively to assess possible effects on the growth and photosynthesis activities of P. concavum cells. Our results showed that the average abundance of P. concavum on E. acoroides leaves was statistically lower than that on the sediment outside the seagrass meadow and that on Thalassia hemperichii leaves. Both the growth and photo- synthesis activities of P. concavum cells were inhibited in the two experiments, which can be attributed to the release and production of allelochemicals by E. acoroides. Our results offer new insights into the interaction between the submerged seagrass E. acoroides and the benthic harmful algal bloom dinoflagellate P. concavum, which can influence the abundance dynamics of P. concavum and pro- vide an alternative for reducing potential threat of BHABs.

LIU Hui;ZOU Jian;XIE Hang;ZHENG Chengzhi;LU Songhui

Research Center of Harmful Algae and Marine Biology,College of Life Science and Technology,Jinan University,Guangzhou 510362,China;Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes,Jinan University,Guangzhou 510632,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519000,China

中国海洋大学学报（自然科学英文版）

[1]LIU Hui;ZOU Jian;XIE Hang;ZHENG Chengzhi;LU Songhui-.Allelopathic Interactions Between the Tropical Macrophyte Enhalus acoroides and Epibenthic HAB Dinoflagellate Prorocentrum concavum)[J].中国海洋大学学报（自然科学英文版）,2022(06):1656-1668

Allelopathic,Macrophyte,Epibenthic,Dinoflagellate,concavum,Xincun,allelopathy,BHABs,seagrasses,Thalassia,hemperichii,allelochemicals

Interactions,Between,Tropical,Enhalus,acoroides,Prorocentrum,harmful,dinoflagellate,bloom,caused,by,occurred,Bay,lagoon,characterized,tropical,ecosystem,southern,China,summer,Both,abiotic,factors,may,affect,abundance,One,known,especially,common,among,aquatic,species,sug,gested,economical,environmentally,friendly,way,eliminate,Benthic,Harmful,Algal,Blooms,To,investigate,possible,allelopathic,interactions,between,field,survey,was,conducted,study,densities,four,major,substrates,over,months,laboratory,fresh,leaves,crude,aqueous,extract,dry,were,added,culture,respectively,assess,effects,growth,photosynthesis,activities,cells,Our,results,showed,that,average,statistically,lower,than,sediment,outside,meadow,inhibited,two,experiments,which,can,attributed,release,production,offer,new,insights,into,submerged,algal,influence,dynamics,vide,alternative,reducing,potential,threat

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