Density and Bleaching of Corals and Their Relationship to the Coral Symbiotic Community

Britayev, Temir A.; Petrochenko, Roman A.; Burmistrova, Yulia A.; Nguyen, Thanh Hai; Lishchenko, Fedor

doi:10.3390/d15030456

Cited by 7 publications

(4 citation statements)

References 53 publications

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“…The present study was conducted at the Dam Bay research station of the Coastal Branch of the Joint Russian-Vietnamese Tropical Research and Technological Center (Tropical Center), from 26 April 2020 to 2 April 2021 (Figure 1, also see Figure 1 in Britayev et al, 2023). The scientific station is located on the shore of the Dam Bay on Tre Island, Central Vietnam.…”

Section: Research Location and Studied Coralmentioning

confidence: 99%

Seasonal bleaching and partial mortality of Pocillopora verrucosa corals of the coast of central Vietnam

Lishchenko,

Burmistrova,

Petrochenko

et al. 2024

Front. Mar. Sci.

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IntroductionCoral reefs are one of the most productive yet vulnerable ecosystems on Earth. An important step in understanding the functioning of coral communities is studying the environmental impact on the state of reefs. The present study aimed to assess the impacts of the water temperature, precipitation, wave action, and population density on the seasonal bleaching, partial and complete mortality of shallow-water branching corals of Pocillopora verrucosa species complex. Materials and methodsThe present study was conducted at the Dam Bay research station (Nha Trang Bay) from 26 April 2020 to 2 April 2021. The environmental data was collected from the Dam Bay weather station and using a temperature logger planted on the nursery, coral bleaching and mortality were assessed visually using photos taken underwater. ResultsThroughout the study, the percentage of bleached coral colonies varied from 1 to 41.5% with two peaks, in autumn (October) and spring (April). Rates of the development of partial mortality varied from 0 to 10%, with a pronounced peak in December. At the end of the experiment, the percentage of coral colonies suffering from partial mortality reached 47%. Only 4,5% of experimental colonies died to the end of the study. Analysis revealed that water temperature and partial mortality are the drivers of bleaching, while wave action, temperature and bleaching are the factors with a significant impact on partial mortality.DiscussionThus, both bleaching and patrial mortality are interlinked and the effect of partial mortality on bleaching is stronger than the opposite. Both phenomena have pronounced seasonal variation, but their maximum manifestation does not coincide in time allowing corals to avoid their synergetic effect. Moreover, it was found that the impact of individual stress on mortality prevailed over the impact of seasonal bleaching and partial mortality events. The main cause of coral death was the development of algal fouling at the sites of colony lesions, which gradually spread over the entire surface of the colony.

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Section: Research Location and Studied Coralmentioning

confidence: 99%

Seasonal bleaching and partial mortality of Pocillopora verrucosa corals of the coast of central Vietnam

Lishchenko,

Burmistrova,

Petrochenko

et al. 2024

Front. Mar. Sci.

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“…The experiment was conducted at the Dam Bay research station of the Marine Branch of the Joint Russian-Vietnamese Tropical Research and Technological Center (Tropical Center), located on Tre Island, Nha Trang Bay (Figure 1). Coral fragments were transplanted and reared, and then the reared colonies were collected and processed in accordance with the methodology developed earlier (Britayev et al, 2023). Distal branch fragments measuring 5-8 cm in length and 3-6 cm in diameter were used in the experiment (Figure 2).…”

Section: Host Coral Characteristics Sampling Location and Experimenta...mentioning

confidence: 99%

Symbiotic communities associated with nursery-reared and natural corals: are they similar?

et al. 2023

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Coral aquaculture techniques have been developed for many species based on a well-documented understanding of the factors that affect coral growth and fitness. However, there is limited knowledge about the composition and structure of ectosymbiotic communities associated with cultured coral colonies. To address this gap, we conducted a study of Pocillopora verrucosa colonies reared from fragments in fixed nurseries and exposed for 6 and 12 months, as well as natural colonies in the same location. Our analysis focused on the species composition, species richness, and abundance of obligate and facultative ectosymbionts associated with the colonies. Obtained results indicate that the community associated with nursery-reared colonies was highly diverse, comprising 25 ectosymbionts, including nine obligate and 16 facultative species. The prevalence, species richness, and density of the communities associated with natural colonies were significantly higher than those associated with reared ones. We also observed differences in the communities associated with reared colonies of different exposures, but we were able to group them as stages of the same community based on the size and exposure of the colonies. These differences may be related to the microhabitat properties of the symbiotic communities, as reared colonies were elevated above the substrate, while natural colonies were attached to them. The age of natural colonies was also estimated to be more than three times higher than that of reared colonies of the same size, also contributing to the differences. Our study clearly demonstrates that coral nurseries not only serve as a means of propagating corals but also offer artificial habitats for the maintenance and conservation of associated fauna. These findings have important implications for the management and conservation of coral reefs.

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“…The present study was conducted at the Dam Bay research station of the Coastal Branch of the Joint Russian-Vietnamese Tropical Research and Technological Center (Tropical Center), located on Tre Island, Nha Trang Bay from 26 April 2020 to 2 April 2021 (Figure 1 in Britayev et al 2023).…”

Section: Studied Coral and Research Locationmentioning

confidence: 99%

Seasonal Bleaching and Partial Mortality of <em>Pocillopora verrucosa</em> Corals off the Coast of Central Vietnam

Lishchenko,

Burmistrova,

Petrochenko

et al. 2023

Preprint

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Coral reefs are one of the most productive yet vulnerable ecosystems on Earth. An important step in understanding the functioning of coral communities is studying the environmental impact on the state of reefs. The present study aimed to assess the impacts of the water temperature, precipitation, wave action and population density on the seasonal bleaching, partial and complete mortality of shallow-water branching corals of Pocillopora verrucosa species complex. The present study was conducted at the Dam Bay research station (Nha Trang Bay) from 26 April 2020 to 2 April 2021. Throughout the study the percentage of bleached coral colonies varied from 1 to 41.5% with two peaks, in autumn (October) and spring (April). Rates of the development of partial mortality varied from 0 to 10%, with a pronounced peak in December. At the end of the experiment, the percentage of coral colonies suffering from partial mortality reached 47%. Only 4,5% of experimental colonies died by the end of the study. Analysis revealed that water temperature and partial mortality are the drivers of bleaching, while wave action, temperature and bleaching are the factors with a significant impact on partial mortality. In the present study, the main cause of coral death was the development of algal fouling at the sites of colony lesions, which gradually spread over the entire surface of the colony. We showed also that the impact of individual stress on mortality prevailed over the impact of seasonal bleaching and partial mortality events.

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Density and Bleaching of Corals and Their Relationship to the Coral Symbiotic Community

Cited by 7 publications

References 53 publications

Seasonal bleaching and partial mortality of Pocillopora verrucosa corals of the coast of central Vietnam

Seasonal bleaching and partial mortality of Pocillopora verrucosa corals of the coast of central Vietnam

Symbiotic communities associated with nursery-reared and natural corals: are they similar?

Seasonal Bleaching and Partial Mortality of <em>Pocillopora verrucosa</em> Corals off the Coast of Central Vietnam

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