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Genetic diversity and temporal variation of the marine Synechococcus community in the subtropical coastal waters of Hong Kong

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Abstract:

The phylogenetic diversity of the marine Synechococcus community in the subtropical coastal waters of Hong Kong, China, was examined through intergenic transcribed spacer clone libraries. All the sequences obtained fell within both marine cluster A (MC-A) and B (MC-B), with MC-A phylotypes dominating throughout the year. Distinct phylogenetic lineages specific to Hong Kong waters were detected from both MC-A and MC-B. The highest Synechococcus community diversity occurred in December, but the highest Synechococcus abundance occurred in August. On the other hand, both the abundance and diversity of Synechococcus showed a minimum in February. The remarkable seasonal variations of Synechococcus diversity observed were likely the result of the changes of hydrographic condition modulated by monsoons. Principal component analysis revealed that the in situ abiotic water characteristics, especially salinity and water turbidity, explained much of the variability of the marine Synechococcus population diversity in Hong Kong coastal waters. In addition, the temporal changes of Synechococcus abundance were largely driven by water temperature.

La diversité phylogénique de la communauté marine de Synechococcus des eaux côtières subtropicales de Hong Kong (Chine) a été examinée à l’aide de banques de clones de la région transcrite de l’espaceur intergénique. Toutes les séquences obtenues se retrouvaient dans les clusters marins A (CM-A) et B (CM-B), les phylotypes CM-A étant dominant au cours de toute l’année. Des lignées phylogéniques distinctes spécifiques aux eaux de Hong Kong étaient présentes dans les deux groupes CM-A et CM-B. La diversité de la communauté de Synechococcus était la plus forte en décembre, mais les bactéries étaient plus abondantes en août. En revanche, l’abondance et la diversité de Synechococcus étaient minimales en février. Ces remarquables variations saisonnières de la diversité de Synechococcus étaient probablement le résultat de changements des conditions hydrographiques modulées par la mousson. L’analyse des principales composantes a révélé que les caractéristiques abiotiques de l’eau in situ, notamment la salinité et la turbidité, expliquaient en grande partie la variabilité de la diversité de la population marine de Synechococcus des eaux côtières de Hong Kong. De plus, les changements temporels de l’abondance de Synechococcus découlaient largement de la température de l’eau.

Document Type: Research Article

Publication date: 2009-03-01

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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