GEOGRAPHY

Yellow Sea green tides may promote the growth of suppressive chlorella


Schematic diagram of species that promote brown tide after sedimentation Image courtesy of the ocean

In 2007, the first green tide formed by the moss in the south Yellow Sea has occurred, and the green tide has been erupting for 15 consecutive years so far. Every year, during the occurrence of green tide, a large number of green algae accumulate along the coastal line of the South Yellow Sea, posing a serious threat to social and economic activities such as tourism and aquaculture in coastal areas. However, in the later stages of the large-scale green tide outbreak, there are still a large number of floating green algae settling, decaying and decomposing in the south Yellow Sea. The current understanding of the impact of the death and decomposition of a large number of floating green algae on the ecological environment of the sea area at the end of the green tide is extremely limited.

Focusing on the impact of the yellow sea green tide on the ecological environment of the sea area, Yu Rencheng, a researcher at the Institute of Oceanology of the Chinese Academy of Sciences, led a research team on harmful algal blooms and marine ecological security, and through years of efforts, identified the settlement area of a large number of floating green algae in the late stage of the green tide in the South Yellow Sea, revealing the unique changes in the ecological environment of the sedimentation area before and after the occurrence of green tide, and the relevant results were published in the academic journal Environmental Science and Technology.

Based on years of field survey data, the research team found that a large number of floating green algae mainly settled in the southeastern waters of the Shandong Peninsula (36-36.5 °N, 122-124 °E) in the southeastern waters of the Shandong Peninsula after the green tide. The changes of phytoplankton communities in the sedimentation area before and after the occurrence of green tide were analyzed by means of amplicon high-throughput sequencing and qPCR, and it was found that after the large-scale green tide subsided, the abundance and dominance of chlorella suppressed in the sedimentation area of phytoplankton were significantly increased.

Based on the relevant survey results, the researchers speculated that the phytoplankton community changes were affected by the environmental changes in the sedimentation area before and after the occurrence of green tides and the formation of warm currents in the Yellow Sea. Chlamydia suppressor is a typical species of ecosystem destructive algal bloom, which has formed brown tides in the Yellow Bohai Sea since 2009, causing great damage to shellfish farming in the sea area and the hatching industry of economic animal seed in coastal areas. Exploring the potential association between green tides and brown tides can help to gain a more comprehensive understanding of the ecological and environmental effects caused by green tides in the Yellow Sea.

The research has been co-funded by the National Natural Science Foundation of China, the Natural Science Foundation of Shandong Province, the Shandong Provincial Major Science and Technology Innovation Project Special Project, and the Special Project for the Investigation of Basic Scientific and Technological Resources. (Source: China Science Daily, Liao Yang, Li Hezhao)

Related paper information:https://doi.org/10.1021/acs.est.1c06502

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