The environmental adaptability and reproductive properties of invasive green alga Codium fragile from the Nan'ao Island,South China Sea  

作　　者：Lanping Ding Xulei Wang Bingxin Huang Weizhou Chen Shanwen Chen 

机构地区：[1]College of Life Sciences,Tianjin Normal University,Tianjin 300387,China [2]Marine Biology Institute,Shantou University,Shantou 515063,China [3]Tianjin Key Laboratory of Animal and Plant Resistance,Tianjin 300387,China

出　　处：《Acta Oceanologica Sinica》2022年第3期70-75,共6页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract Nos 31970216 and 31670199;the Science and Technology Plan Project of Guangdong Province under contract No.2012A020200007;the Scientific Research Plan of Tianjin Municipal Education Committee under contract No.JW1705;the Research Fund for Talented Scholars of Tianjin Normal University(2016)。

摘　　要：It has been widely recognized that biological invasion has become one of the greatest threats to the ecosystem.Codium fragile is an invasive species which exhibits a variety of attributes like parthenogenesis,winter fragment,and vegetative reproduction;and therefore,it has become a successful invader,colonizing most subtropical regions.In China’s southeast coastal aquaculture waters,the green algal bloom caused by C.fragile will probably become a serious problem.In order to understand more details about the species,an experiment focused on its reproductive characteristics was conducted using culture established from a sample collected in the aquaculture raft of the Nan’ao Island in the South China Sea.The results showed that there were two types of gametes resembling aplanospores and zoospores respectively,both of which were able to germinate.During the gametes liberation,a long mucilage tube was formed out of the mouth of the gametangium assisting dispersal of gametes away from the parent plant.This tube was adapted not only to its surrounding flowing water environment but also to its parent plant’s outer gelatinous structure.In general,the optimum temperature for gametes release and germination was 15-20℃ and 15℃,respectively,which corresponded to the local offshore marine water.The plant was observed to produce vegetative buds under favourable reproductive conditions which were called propagules.They were capable of developing into filamentous thalli.The results will provide some scientific evidences for revealing the biological mechanism of bloom and control strategies of invasive green algae.

关 键 词：Codium fragile GAMETES PROPAGULES mucilage tube temperature environmental adaptation 

分 类 号：Q948.8[生物学—植物学]