Abstract
Bacterial populations association with phytoplankton cultures used as food for bivalve larvae were enumerated and identified from their partial 16S rDNA gene sequences. Microalgae were provided from different European hatcheries during the larval production season. Average concentration (direct counts) of bacteria ranged from 1.3 × 105 to 5.3 × 108 mL−1 while culturable bacteria represented from 10% to >60% of total bacteria. In most cases, three to six representatives of each type of colony were collected on solid medium. The identity of isolates from the same colony type was checked by two different randomly amplified polymorphic DNA (RAPD) typing methods, after which the 16S rDNA gene of one to three isolates by colony type were partially sequenced. Algae harbored a large spectrum of bacteria belonging to the α-Proteobacteria, β-Proteobacteria, γ-Proteobacteria, Cytophaga– Flavobacterium– Bacteroides (CFB) group, Actinobacteria, and Bacillus. Members of the Roseobacter clade and CFB group were the most abundant. In the majority of cases one strain constituted 50% or more of the culturable bacterial flora. About half of the isolates were common to two hatcheries or at least two microalgal cultures. Several isolates were closely related to bacteria associated with harmful dinoflagellates in culture. Thus, the algal cultures seemed to favor certain bacterial species which belonged to distantly separated groups. As some of them could disturb the development of bivalve larvae, the control of bacterial populations would undoubtedly make it possible to reduce larval losses in bivalve rearing.
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The authors thank T. Harry Birkbeck for improving the English. This work was supported by DGXIV of the European Community under the Fair Project CT-97-9052.
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Nicolas, JL., Corre, S. & Cochard, JC. Bacterial Population Association with Phytoplankton Cultured in a Bivalve Hatchery. Microb Ecol 48, 400–413 (2004). https://doi.org/10.1007/s00248-003-2031-6
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DOI: https://doi.org/10.1007/s00248-003-2031-6