In conclusion, symbiotic algae tend to be species-specific, whereas bacteria fluctuate significantly over sampling time. Studying the molecular issues of microalgae, the presence, the role of some groups of bacteria involved in the N, C, P, and S cycles, and the influence of environmental parameters should also be encouraged to understand the relationship of coral holobiont better. | Vietnam Journal of Marine Science and Technology 2022 22 2 177 188 Vietnam Academy of Science and Technology Vietnam Journal of Marine Science and Technology journal homepage jmst Fluctuation of associated microbial with building reef corals Acropora sp. from Hang Rai Ninh Thuan Pham Thi Mien Nguyen Kim Hanh Phan Minh Thu Nguyen Minh Hieu Vo Hai Thi Nguyen Trinh Duc Hieu Hoang Trung Du Nguyen Huu Huan Institute of Oceanography VAST Vietnam E-mail Received 26 June 2021 Accepted 30 September 2021 ABSTRACT El Niño and the prolonged warm sea surface temperature significantly impacted coral reefs and caused coral bleaching in some parts of the world. This study evaluated the density of symbiotic algae and bacteria associated with the three coral species namely Acropora hyacinthus Acropora muricata and Acropora robusta collected in Hang Rai Ninh Thuan in May June August 2016 and June 2017. The number of zooxanthellae with each coral species was statistically significant and correlated with several environmental factors suggesting that symbiotic algae could play a key role in coral health. The number of associated microbial with the three coral species was significantly different they tended to depend on sampling time rather than coral species-specific. At the time of ENSO 2016 the difference in the total associated bacteria with all three coral species was statistically significant. While the total number of related bacteria with all three species of coral collected in 2017 did not differ from the total of bacteria in ambient water. In conclusion symbiotic algae tend to be species-specific whereas bacteria fluctuate significantly over sampling time. Studying the molecular issues of microalgae the presence the role of some groups of bacteria involved in the N C P and S cycles and the influence of environmental parameters should also be encouraged to understand the relationship of coral holobiont better. Keywords Symbiotic .
