Phylogenetic diversity and spatiotemporal dynamics of bacterial and microeukaryotic plankton communities in Gwangyang Bay of the Korean Peninsula

Abstract

Nutrient dynamics function globally, flowing from rivers to the ocean (estuarine–coastal zone), and are vulnerable to climate change. Microbial habitats can be affected by marine nutrient dynamics and may provide a clue to predict microbial responses to environmental heterogeneity in estuarine–coastal zones. We surveyed surface seawater in Gwangyang Bay, a semi-enclosed estuary in Korea, from 2016 to 2018 using a metabarcoding approach with prokaryotic 16S and eukaryotic 18S rRNA genes. Bacterial and microeukaryotic communities in these waters showed distinct local communities in response to environmental heterogeneity and community transition at spatiotemporal scales in the estuarine–coastal zone. The relative abundance of prokaryotic and eukaryotic operational taxonomic units suggested a microbial trophic interaction in the Gwangyang Bay waters. We found that the community assembly process in prokaryotic communities was primarily influenced by biological interaction (immigration–emigration), whereas that in eukaryotic communities was more affected by environmental stress (habitat specificity) rather than by biotic factors. Our findings in the Gwangyang Bay waters may provide information on underlying (biotic or abiotic) factors of the assembly process in microbial communities in the estuarine–coastal zone.

An insight into the prokaryotic diversity from a polymetallic nodule-rich region in the Central Indian Ocean Basin using next generation sequencing approach

“…Higher abundance in microbial diversity at genera level was detected in the lower depths of the water column in this study. A higher abundance of SAR11 clade has been reported as an indication of the degradation of planktonic-derived organic matter by bacteria ( Han et al, 2022 ). The higher abundance of Marinimicrobia (SAR406_clade) and SAR202_clade at 200 and 600 m in the water column can be directly related to the negative correlation of the genera to oxygen and nitrate in the water samples.…”

Baltic Sea coastal sediment-bound eukaryotes have increased year-round activities under predicted climate change related warming

“…These conditions tended to provide settings for a more similar in alpha diversity. Recent climate change has already altered the marine eukaryotic diversity globally, e.g., in temperate zones and high latitude areas ( Gao et al, 2018 ; Han et al, 2022 ) and the impacts of climate change can either work directly on the eukaryote’s life-cycle, or indirectly through food web interactions ( Przytulska et al, 2015 ). Eukaryotic diversity in the marine ecosystem generally declines toward the poles, which is suggested to be primarily driven by decreasing of ocean temperatures ( Ibarbalz et al, 2019 ).…”

Diversity and abundance of phytoplankton in Bone Bay, South Sulawesi, Indonesia and its relationship with environmental variables

“…Changes in water temperature to certain limits, as well as the availability of light, turbulence, salinity, water turbidity, and tidal currents, are other environmental factors that influence the growth of phytoplankton (Ardyn et al 2020), as well as the emergence of other types of phytoplankton in the Baffin Bay (Oziel et al 2019). As reported by Han et al (2022), every year, the increase in temperature and ice melting during the Austral Spring causes the succession of phytoplankton communities in Gwangyang Bay on the Korean Peninsula.…”