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Fimbriaphyllia ancora

ABSTRACT: Euphyllia ancora overview

PROVIDER: PRJNA344351 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	DRR235372.fastq.gz	Fastqsanger.gz
	DRR235373_1.fastq.gz	Fastqsanger.gz
	DRR235373_2.fastq.gz	Fastqsanger.gz
	DRR235374_1.fastq.gz	Fastqsanger.gz

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Microbiome heterogeneity in tissues of the coral, Fimbriaphyllia (Euphyllia) ancora.

Project description:Coral microbiomes differ in the mucus, soft tissue and skeleton of a coral colony, but whether variations exist in different tissues of a single polyp is unknown. In the stony coral, Fimbriaphyllia ancora, we identified 8,994 amplicon sequencing variants (ASVs) in functionally differentiated polyp tissues, i.e., tentacles, body wall, mouth and pharynx, mesenterial filaments, and gonads (testes and ovaries), with a large proportion of ASVs specific to individual tissues. However, shared ASVs comprised the majority of microbiomes from all tissues in terms of relative abundance. No tissue-specific ASVs were found, except in testes, for which there were only two samples. At the generic level, Endozoicomonas was significantly less abundant in the body wall, where calicoblastic cells reside. On the other hand, several bacterial taxa presented significantly higher abundances in the mouth. Interestingly, although without statistical confirmation, gonadal tissues showed lower ASV richness and relatively high abundances of Endozoicomonas (in ovaries) and Pseudomonas (in testes). These findings provide evidence for microbiome heterogeneity between tissues within coral polyps, suggesting a promising field for future studies of functional interactions between corals and their bacterial symbionts.

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Development of an in vitro tissue culture system for hammer coral (Fimbriaphyllia ancora) ovaries.

Project description:In vitro gonad culture systems have proven useful to investigate intrinsic mechanisms of sexual reproduction in animals. Here we describe development of an in vitro culture method for coral ovaries. Mesenterial tissues containing both ovaries and mesenterial filaments were microscopically isolated from the scleractinian coral, Fimbriaphyllia ancora, and culture conditions were optimized. M199 diluted 10× (10% M199, pH 8.1) and supplemented with 25 mM HEPES and the antibiotics, ampicillin, penicillin and streptomycin, supported oocyte survival and maintained the structural integrity of ovaries during short-term culture (~ 6 days). Addition of a commercial antibiotic-antimycotic solution (Anti-Anti) and fetal bovine serum adversely affected ovary maintenance and caused tissue disintegration. Characterization of cultured ovaries showed that there is no difference in cell proliferation of ovarian somatic cells between culture Days 1 and 6. Moreover, the presence of oogonia and expression of a major yolk protein, vitellogenin, were confirmed in ovaries cultured for 6 days. This system will be useful for studying effects of a wide range of substances on coral oogenesis.

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The stony coral Fimbriaphyllia (Euphyllia) ancora's reproductive strategy involves a sex change every year.

Project description:A sex change phenomenon was reported in some free-living, non-sessile coral species of the Family Fungiidae. However, there are no reports describing sex change in sessile colonial species. Timing and cellular processes of sex change are also unclear in corals. Here, we report sex change of the colonial coral, Fimbriaphyllia ancora, and its cellular process. Of 26 colonies monitored at Nanwan Bay, southern Taiwan, about 70% changed their sex every year after annual spawning for least 3-4 consecutive years, i.e., colonies that were male two years ago became female last year, and male again this year. The remaining 30% were permanently male or female. Sex-change and non-sex-change colonies grew in close proximity or even side-by-side. No significant differences were found in colony size between sex-change and non-sex-change colonies. Histological analysis showed that, in female-to-male sex change, small oocytes were present up to 3 months in some gonads after spawning and disappeared by 5 months. This suggests that sex change occurred 4-5 months after spawning. In contrast, in male-to-female sex change, oocytes appeared weeks after sperm release and in most gonads by 3 months, suggesting that male-to-female sex change occurred 0-3 months after sperm release.

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