Low genetic diversity in the endangered marine alga Silvetia siliquosa(Ochrophyta:Fucaceae)and the implication to conservation  

作　　者：Yanshuo LIANG Jie ZHANG Xiaohan SONG Han-Gil CHOI Xu GAO Delin DUAN Zi-min HU 

机构地区：[1]CAS and Shandong Province Key Laboratory of Experimental Marine Biology,Center for Ocean Mega-Science,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [2]Laboratory for Marine Biology and Biotechnology,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China [3]University of Chinese Academy Sciences,Beijing 100049,China [4]Faculty of Biological Science and Institute for Environmental Science,Wonkwang University,Iksan 54538,Korea [5]Ocean School,Yantai University,Yantai 264005,China

出　　处：《Journal of Oceanology and Limnology》2022年第1期216-225,共10页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(Nos.31971395,41761144057)。

摘　　要：Although signifi cant research eff orts have been targeted toward conservation and management of endangered terrestrial fl ora and fauna,attempts have been limited to conserve threatened seaweeds.Silvetia siliquosa is an ecologically and commercially vital brown alga that is uniquely distributed in the Yellow-Bohai Sea and along the southwest coast of Korea.A massive decline in its distribution range and biomass from the mid-1990s onward indicates that this species has become endangered.In the present study,we used nuclear internal transcribed spacer and concatenated mitochondrial cytochrome oxidase I subunit+intergenic spacer to estimate the genetic diversity,population connectivity,and degree of genetic diff erentiation of S.siliquosa in China and Korea.The molecular results exhibited strikingly low levels of haplotype/ribotype and nucleotide diversity in S.siliquosa populations,with only three mitochondrial haplotypes and nuclear ribotypes detected in 136 and 143 specimens,respectively.The analysis of molecular variance revealed 85%-95%of genetic variance among populations.Population diff erentiation coeffi cient(F_(ST))and gene fl ow(N_(m))suggested that two populations(JIN and GWA)along the southern coast of Korea are highly divergent from the others,with weak genetic exchange.No signifi cant genetic diff erentiation was observed among populations either in China or along the geographically proximate west coast of Korea.Thus,four independent management units were designated for sustainable management:the LII and RUS populations in China,the YEO and CHA populations along the west coast of Korea,and each of the GWA and JIN populations along the south coast of Korea.We suggest that artifi cial cultivation and transplantation of S.siliquosa are the eff ective approaches for restoration and conservation.

关 键 词：biodiversity conservation endangered seaweed genetic diversity habitat loss Silvetia siliquosa 

分 类 号：Q943[生物学—植物学]