Changes in the composition and diversity of the bacterial microbiota associated with oysters (Crassostrea corteziensis, Crassostrea gigas and Crassostrea sikamea) during commercial production

• Published in: FEMS Microbiology Ecology
• Main Authors: Trabal Fernández, Natalia, Mazón Suástegui, José M., Vázquez Juárez, Ricardo, Ascencio Valle, Felipe, Romero Ormazábal, Jaime
• Format: Article in Journal/Newspaper
• Language: English
• Published: Federation of European Microbiological Societies 2014
• Subjects: Bivalve molluscs; Isi; Crassostrea gigas
• Online Access: https://doi.org/10.1111/1574-6941.12270; https://repositorio.uchile.cl/handle/2250/124124

Artículo de publicación ISI The resident microbiota of three oyster species (Crassostrea corteziensis, Crassostrea gigas and Crassostrea sikamea) was characterised using a high-throughput sequencing approach (pyrosequencing) that was based on the V3–V5 regions of the 16S rRNA gene. We analysed the changes in the bacterial community beginning with the postlarvae produced in a hatchery, which were later planted at two grow-out cultivation sites until they reached the adult stage. DNA samples from the oysters were amplified, and 31 008 sequences belonging to 13 phyla (including Proteobacteria, Bacteroidetes, Actinobacteria and Firmicutes) and 243 genera were generated. Considering all life stages, Proteobacteria was the most abundant phylum, but it showed variations at the genus level between the postlarvae and the adult oysters. Bacteroidetes was the second most common phylum, but it was found in higher abundance in the postlarvae than in adults. The relative abundance showed that the microbiota that was associated with the postlarvae and adults differed substantially, and higher diversity and richness were evident in the postlarvae in comparison with adults of the same species. The site of rearing influenced the bacterial community composition of C. corteziensis and C. sikamea adults. The bacterial groups that were found in these oysters were complex and metabolically versatile, making it difficult to understand the host–bacteria symbiotic relationships; therefore, the physiological and ecological significances of the resident microbiota remain uncertain. Funding was provided by Consejo Nacional de Ciencia y Tecnolog ıa of Mexico (SEP-CONACYT grants 129025 and 106887). N. A. is a recipient of a CONACYT doctoral fellowship and an internship grant at the Instituto Nacional de Tecnolog ıa de los Alimentos (Universidad de Chile).