Analyses of the genetic structure of Sargassum horneri in the Yellow Sea: implications of the temporal and spatial relations among floating and benthic populations
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Sargassum horneri is one of the most common seaweeds in China growing on solid substrates in the sublittoral zones along the Chinese coast. Large-scale drifting biomass of S. horneri has been reported in the Yellow Sea since 2010. Huge amount of the stranded biomass of this alga on the cultivation rafts of Pyropia yezoensis has drawn wide attention after damaging the local Pyropia farming industry. The original sources of the drifting biomass in the Yellow Sea remain unknown. In this study, 16 populations including three benthic and 13 drifting ones were sampled from the Yellow Sea and the East China Sea. Results of microsatellite analyses revealed that there were significant genetic differentiations among most of the investigated populations. Cluster analysis demonstrated that the drifting individuals from the same year, rather than from the same sampling locations, were clustered together. The existence of marked admixture in six populations also implies that the same drifting population could be of different origins. These results provide evidence suggesting that the drifting populations, in particular the populations occurring in different years, originated from multiple sources. Satellite imagery observation combined with genetic analyses of more benthic and drifting populations in the future are expected to elucidate, on a clearer level, the exact locations of the origin of the drifting populations.
KeywordsMicrosatellite Molecular markers Drifting seaweeds Sargassum horneri Genetic structure
The authors would like to thank the anonymous reviewers for their constructive comments. This research was supported by the scientific and technological innovation project from Qingdao National Laboratory for Marine Science and Technology (No. 2015ASKJ01), the National Key Technology Support Program (2015BAD13B05), the National Infrastructure of Fishery Germplasm Resource (2016DKA30470) and China Agriculture Research System (CARS-50).
- Cai YC, Sun B, Ma JH, He PM, Zhang Q (2014) Molecular identification of floating Sargassum horneri in the southern Yellow Sea. Mar Fish 36:102–106 (in Chinese with English abstract)Google Scholar
- Chen J, Wang Y, Yu Q, Bi Y, He P, Liu Z, Qin S (2016) Molecular phylogenetic analysis of floating Sargassum horneri associated with green tides in coastal area of Qingdao. J Biol 33(1):39–42 (in Chinese with English abstract)Google Scholar
- Choi CG, Kim HG, Sohn CH (2003) Transplantation of young fronds of Sargassum horneri for construction of seaweed beds. J Korean Fish Soc 36:469–473Google Scholar
- Excoffier L, Laval G, Schneider S (2005) Arlequin (version 3.0): an integrated software package for population genetics data analysis. Evolt Bioinformatics Online 1:47Google Scholar
- Konishi Y (2000) Drifting seaweeds coming from China too. Seikai Fisheries Research Institute News 103:11-15 (in Japanese)Google Scholar
- Sun JZ, Chen WD, Zhuang DG, Zheng HY, Li L, Pang SJ (2008) In situ ecological studies of the subtidal brown alga Sargassum horneri at Nanji Island of China. South China Fish Sci 4:59–64 (in Chinese with English abstract)Google Scholar
- Sun JZ, Zhuang DG, Wang TG, Zheng JB, Chen WD (2009) Design and primary enforcement of Sargassum horneri ground establishment around Nanji Island. Mod Fish Information 24:25–28 (in Chinese with English abstract)Google Scholar
- Tseng CK (2000) Flora Algarum Marinarum Sinicarum, Tomus 3. Phaeophyta (no. 2) Fucales Science Press, Beijing (in Chinese)Google Scholar
- Yoshida T (1963) Studies on the distribution and drift of the floating seaweed. Bull Tohoku Reg Fish Res Lab 23:141–186 (in Japanese)Google Scholar