Promoting larval settlement of coral Pocillopora damicornis by calcium

Coral Reefs ◽  
2022 ◽  
Author(s):  
Qingsong Yang ◽  
Wenqian Zhang ◽  
Ying Zhang ◽  
Xiaoyu Tang ◽  
Juan Ling ◽  
...  
Keyword(s):  
Larval Settlement ◽  
Pocillopora Damicornis

Calcified macroalgae and their bacterial community in relation to larval settlement and metamorphosis of reef-building coral Pocillopora damicornis

2020 ◽  
Vol 97 (1) ◽  
Author(s):  
Fangfang Yang ◽  
Jiahao Mo ◽  
Zhangliang Wei ◽  
Lijuan Long
Keyword(s):  
Bacterial Community ◽  
Community Composition ◽  
Bacterial Community Composition ◽  
Larval Settlement ◽  
Pocillopora Damicornis ◽  
Principal Coordinates Analysis ◽  
Principal Coordinates ◽  
Coral Reef Ecosystems ◽  
Settlement And Metamorphosis ◽  
Invertebrate Larvae

ABSTRACT Calcified macroalgae play an important role in the settlement and metamorphosis of invertebrate larvae in coral reef ecosystems. However, little is known about the algal-associated bacterial communities and their effects on larval settlement. In this study, the responses of larvae of the coral Pocillopora damicornis to calcified algae (Porolithon onkodes, Halimeda cylindracea, Halimeda opuntia and Amphiroa fragilissima) were evaluated. The results revealed that Por. onkodes and H. cylindracea significantly enhanced the rates of settlement and metamorphosis, whereas fewer larvae settled on Am. fragilissima and H. opuntia. Amplicon pyrosequencing of the V3–V4 region of 16S rDNA was applied to investigate the relationship between algal bacterial community and larval settlement. Principal coordinates analysis demonstrated that the bacterial community composition of H. opuntia was more similar to that of Am. fragilissima, but clearly distinct from those of H. cylindracea and Por. onkodes. Furthermore, the relative abundances of bacteria were highly diverse among different algae. H. opuntia had higher percentages of Thalassobius, Pelagibius and SM1A02, whereas the abundances of Mycoplasma and Suttonella were significantly higher in H. cylindracea than other algae. Our results showed that larval settlement/metamorphosis was strongly correlated with the bacterial community composition and with the relative abundance of a few operational taxonomic units.

scholarly journals Bacterial Communities Associated With Healthy and Bleached Crustose Coralline Alga Porolithon onkodes

2021 ◽  
Vol 12 ◽  
Author(s):  
Fangfang Yang ◽  
Zhiliang Xiao ◽  
Zhangliang Wei ◽  
Lijuan Long
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Larval Settlement ◽  
Crustose Coralline Alga ◽  
Coralline Algae ◽  
Pocillopora Damicornis ◽  
Crustose Coralline Algae ◽  
Settlement And Metamorphosis ◽  
Relative Abundances

Crustose coralline algae (CCA) play vital roles in producing and stabilizing reef structures and inducing the settlement and metamorphosis of invertebrate larvae in coral reef ecosystems. However, little is known about the bacterial communities associated with healthy and bleached CCA and their interactions with coral larval settlement. We collected samples of healthy, middle semi-bleached, and bleached CCA Porolithon onkodes from Sanya Bay in the South China Sea and investigated their influences on the larval settlement and metamorphosis of the reef-building coral Pocillopora damicornis. The larval settlement/metamorphosis rates all exceeded 70% when exposed to healthy, middle semi-bleached, and bleached algae. Furthermore, the compositions of bacterial community using amplicon pyrosequencing of the V3–V4 region of 16S rRNA were investigated. There were no obvious changes in bacterial community structure among healthy, middle semi-bleached, and bleached algae. Alphaproteobacteria, Bacteroidetes, and Gammaproteobacteria were dominant in all samples, which may contribute to coral larval settlement. However, the relative abundances of several bacterial communities varied among groups. The relative abundances of Mesoflavibacter, Ruegeria, Nautella, and Alteromonas in bleached samples were more than double those in the healthy samples, whereas Fodinicurvata and unclassified Rhodobacteraceae were significantly lower in the bleached samples. Additionally, others at the genus level increased significantly from 8.5% in the healthy samples to 22.93% in the bleached samples, which may be related to algal bleaching. These results revealed that the microbial community structure associated with P. onkodes generally displayed a degree of stability. Furthermore, bleached alga was still able to induce larval settlement and metamorphosis.

Larval Settlement of Corals in Flowing Water using a Racetrack Flume

2002 ◽  
Vol 36 (1) ◽  
pp. 76-79 ◽  
Author(s):  
S. Harii ◽  
H. Kayanne
Keyword(s):  
Reef Flat ◽  
Marine Invertebrates ◽  
Larval Settlement ◽  
Flow Speed ◽  
Flowing Water ◽  
Pocillopora Damicornis ◽  
Settlement Rate ◽  
Ishigaki Island ◽  
Digitally Controlled ◽  
Flow Speeds

Although the larvae of marine invertebrates settle in currents, few studies have examined settlement under flow. We studied the settlement of two brooding coral larvae with different behavior in a flow using a small racetrack flume made of polycarbonate and acrylic (58 cm long). Flow was generated using a digitally controlled gear-motor-driven paddle wheel. The settlement rates of the larvae, Heliopora coerulea and Pocillopora damicornis, were observed at three flow speeds: 1.6, 4.4, and 9.8 cm/sec, which correspond to the currents at low, mean, and ebb or flood tides, respectively, at Shiraho Reef flat, Ishigaki Island, Japan. The settlement rate of H. coerulea larvae decreased with increasing flow speed (20% at 1.6 cm/sec, 2% at 9.8 cm/sec). In contrast, the settlement rate of P. damicornis larvae was high at all flow speeds (> 50% at all flow speeds). This difference in the larval settlement rates of the two species is in accordance with the current conditions in which the adult corals are distributed.

scholarly journals Impact of diurnal temperature fluctuations on larval settlement and growth of the reef coral <i>Pocillopora damicornis</i>

2017 ◽  
Author(s):  
Lei Jiang ◽  
You-Fang Sun ◽  
Yu-Yang Zhang ◽  
Guo-Wei Zhou ◽  
Xiu-Bao Li ◽  
...  
Keyword(s):  
Larval Settlement ◽  
Seawater Temperature ◽  
Reef Coral ◽  
Temperature Fluctuations ◽  
Maximum Temperature ◽  
Pocillopora Damicornis ◽  
Positive Effects ◽  
Early Stages ◽  
Tropical Reef ◽  
Excitation Pressure

Abstract. Diurnal fluctuations in seawater temperature are ubiquitous on tropical reef flats. However, effects of such dynamic temperature variations on the early stages of corals are poorly understood. Here, we investigated the responses of larvae and new spats of Pocillopora damicornis to two constant temperature treatments (29 and 31 °C), and two diurnally fluctuating treatments (28–31 and 30–33 °C with daily means of 29 and 31 °C, respectively) simulating the 3 °C diel oscillations at 3 m depth on Luhuitou fringing reef (Sanya, China). Results showed that the thermal stress on settlement at 31 °C was almost negated by the fluctuating treatment. Further, temperature fluctuations did not exacerbate bleaching responses but alleviated the maximum excitation pressure over photosystem Ⅱ (PSⅡ). Although early growth and development were highly stimulated at 31 °C, oscillations of 3 °C had little effects on budding and lateral growth. Nevertheless, daytime encounters with the maximum temperature of 33 °C elicited a notable reduction in calcification. These results underscore the complexity in the effects caused by diel temperature fluctuations on early stages of corals, and suggest that the ecologically relevant temperature variability could buffer the warming stress on larval settlement and dampen the positive effects of increased temperatures on coral growth.

scholarly journals Impact of diurnal temperature fluctuations on larval settlement and growth of the reef coral <i>Pocillopora damicornis</i>

2017 ◽  
Vol 14 (24) ◽  
pp. 5741-5752 ◽  
Author(s):  
Lei Jiang ◽  
You-Fang Sun ◽  
Yu-Yang Zhang ◽  
Guo-Wei Zhou ◽  
Xiu-Bao Li ◽  
...  
Keyword(s):  
Larval Settlement ◽  
Seawater Temperature ◽  
Reef Coral ◽  
Temperature Fluctuations ◽  
Maximum Temperature ◽  
Pocillopora Damicornis ◽  
Positive Effects ◽  
Early Stages ◽  
Tropical Reef ◽  
New Recruits

Abstract. Diurnal fluctuations in seawater temperature are ubiquitous on tropical reef flats. However, the effects of such dynamic temperature variations on the early stages of corals are poorly understood. In this study, we investigated the responses of larvae and new recruits of Pocillopora damicornis to two constant temperature treatments (29 and 31 °C) and two diurnally fluctuating treatments (28–31 and 30–33 °C with daily means of 29 and 31 °C, respectively) simulating the 3 °C diel oscillations at 3 m depth on the Luhuitou fringing reef (Sanya, China). Results showed that the thermal stress on settlement at 31 °C was almost negated by the fluctuating treatment. Further, neither elevated temperature nor temperature fluctuations caused bleaching responses in recruits, while the maximum excitation pressure over photosystem II (PSII) was reduced under fluctuating temperatures. Although early growth and development were highly stimulated at 31 °C, oscillations of 3 °C had little effects on budding and lateral growth at either mean temperature. Nevertheless, daytime encounters with the maximum temperature of 33 °C in fluctuating 31 °C elicited a notable reduction in calcification compared to constant 31 °C. These results underscore the complexity of the effects caused by diel temperature fluctuations on early stages of corals and suggest that ecologically relevant temperature variability could buffer warming stress on larval settlement and dampen the positive effects of increased temperatures on coral growth.

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