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

2009 ◽  
Vol 55 (3) ◽  
pp. 311-318 ◽  
Author(s):  
Hongmei Jing ◽  
Rui Zhang ◽  
Stephen B. Pointing ◽  
Hongbin Liu ◽  
Peiyuan Qian
Keyword(s):  
Hong Kong ◽  
Coastal Waters ◽  
Principal Component ◽  
Population Diversity ◽  
Community Diversity ◽  
Water Characteristics ◽  
Hydrographic Condition ◽  
Abundance And Diversity ◽  
Phylogenetic Lineages ◽  
Hong Kong Coastal Waters

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.

scholarly journals Macronutrient and iron limitation of phytoplankton growth in Hong Kong coastal waters

2006 ◽  
Vol 318 ◽  
pp. 141-152 ◽  
Author(s):  
AJ Miao ◽  
DA Hutchins ◽  
K Yin ◽  
FX Fu ◽  
PJ Harrison ◽  
...  
Keyword(s):  
Hong Kong ◽  
Coastal Waters ◽  
Phytoplankton Growth ◽  
Iron Limitation ◽  
Hong Kong Coastal Waters

scholarly journals Influence of seasonal monsoons on net community production and CO<sub>2</sub> in subtropical Hong Kong coastal waters

2011 ◽  
Vol 8 (2) ◽  
pp. 289-300 ◽  
Author(s):  
X.-C. Yuan ◽  
K. Yin ◽  
W.-J. Cai ◽  
A. Y. Ho ◽  
J. Xu ◽  
...  
Keyword(s):  
Hong Kong ◽  
Coastal Waters ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Wet Season ◽  
Net Community Production ◽  
The Pearl River ◽  
Hong Kong Coastal Waters ◽  
Community Production

Abstract. Data from seven cruises in three different environments including the Pearl River estuary, sewage discharge outfall, and eastern coastal/shelf waters were used to examine the seasonal variations in net community production (NCP) and the biologically active gases O2 and CO2. In the winter dry season, when monsoon-induced downwelling was dominant, NCP was negative (−84 ± 50 mmol C m−2 d−1) in all three regions. The negative NCP corresponded to O2 influxes of 100 ± 50 mmol O2 m−2 d−1 and CO2 effluxes of 24 ± 10 mmol C m−2 d−1. In the summer wet season, when upwelling brought the deep oceanic waters to the coast due to the southwest monsoonal winds, there was a 2 to 15-fold increase in integrated primary production (IPP) compared to winter. The increase in IPP was likely due to the favorable conditions such as stratification and the nutrient inputs from upwelled waters and the Pearl River estuary. NCP in the mixed layer reached up to 110 ± 48 mmol C m−2 d−1 in the wet season. However, accompanying the high positive NCP, we observed an O2 influx of 100 ± 60 mmol O2 m−2 d−1 and CO2 efflux of 21 ± 15 mmol C m−2 d−1. The contradictory observation of positive NCP and CO2 release and O2 uptake in the mixed layer could be explained by the influence of the southwest monsoon-induced upwelling along with the influence of the Pearl River, as the upwelling brought cold, low dissolved oxygen (DO, 160 ± 30 μM) and high dissolved inorganic carbon (DIC, 1960 ± 100 μatm) water to the surface in the wet season. Hence, the subtropical Hong Kong coastal waters are generally a CO2 source due to the monsoonal influence during both the dry-heterotrophic and wet-autotrophic seasons.

Field validation of antioxidant enzyme biomarkers in mussels (Perna viridis) and clams (Ruditapes philippinarum) transplanted in Hong Kong coastal waters

2005 ◽  
Vol 51 (8-12) ◽  
pp. 694-707 ◽  
Author(s):  
Sharon B. De Luca-Abbott ◽  
Bruce J. Richardson ◽  
Katherine E. McClellan ◽  
Gene J. Zheng ◽  
Michael Martin ◽  
...  
Keyword(s):  
Hong Kong ◽  
Antioxidant Enzyme ◽  
Coastal Waters ◽  
Ruditapes Philippinarum ◽  
Perna Viridis ◽  
Field Validation ◽  
Hong Kong Coastal Waters

The use of selected genotoxicity assays in green-lipped mussels (Perna viridis): A validation study in Hong Kong coastal waters

2008 ◽  
Vol 57 (6-12) ◽  
pp. 479-492 ◽  
Author(s):  
Stanley Y.M. Siu ◽  
Paul K.S. Lam ◽  
Michael Martin ◽  
Christopher W. Caldwell ◽  
Bruce J. Richardson
Keyword(s):  
Hong Kong ◽  
Validation Study ◽  
Coastal Waters ◽  
Perna Viridis ◽  
Hong Kong Coastal Waters

Effects of surface fouling organisms on the occurrence of fungi on submerged pine blocks in Hong Kong coastal waters

Hydrobiologia ◽  
1986 ◽  
Vol 135 (1-2) ◽  
pp. 123-130 ◽  
Author(s):  
L. L. P. Vrijmoed ◽  
I. J. Hodgkiss ◽  
L. B. Thrower
Keyword(s):  
Hong Kong ◽  
Coastal Waters ◽  
Fouling Organisms ◽  
Hong Kong Coastal Waters
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