Response of microbial community structure to environmental forcing in the Arabian Sea

Campbell, Lisa; Landry, Michael R.; Constantinou, John; Nolla, Hector; Brown, Susan L.; Liu, Hongbin; Caron, David A.

doi:10.1016/s0967-0645(98)00072-1

Cited by 143 publications

(95 citation statements)

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“…An overview of the living component of carbon biomass and its seasonal variations along 64 E and coastal stations (occupied by JGOFS India Programme) is also summarized in this figure. It is evident that the bacterial community is dominant during spring intermonsoon (see also Ramaiah et al 1996;Campbell et al 1998). During April --May, when chlorophyll concentrations and primary production are low (Bhattathiri et al 1996), bacteria appear to be very important in sustaining a greater abundance of microzooplankton as well as of mesozooplankton through the microbial loop (Madhupratap et al 1996a).…”

Section: Discussionmentioning

confidence: 99%

“…Under the Joint Global Ocean Flux Study (JGOFS) programmes, there have been a number of recent studies on the abundance (and production) of bacteria in the Arabian Sea (Burkill et al 1993;Ducklow 1993;Wiebinga 1994;Ramaiah et al 1996;Goosen et al 1997;Veldhuis et al 1997;Wiebinga et al 1997;Campbell et al 1998). Seasonal variations are clearly seen with higher abundance and production rates during spring and fall inter-monsoons (Ramaiah et al 1996;Campbell et al 1998;Pomroy and Joint 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Seasonal variations are clearly seen with higher abundance and production rates during spring and fall inter-monsoons (Ramaiah et al 1996;Campbell et al 1998;Pomroy and Joint 1999). However, the relationship of bacteria with available organic carbon in situ is not well understood.…”

Section: Introductionmentioning

confidence: 99%

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Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

et al. 2000

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Bacterial abundance and production, numbers, sizes and concentrations of transparent exopolymer particles (TEP) and total organic carbon (TOC) were measured during the 1996 summer monsoon to understand the relationship between TEP, the most labile particulate organic carbon, and bacteria. While high regional variability in the vertical distribution of TOC was discernible, TEP concentrations were high in surface waters at 18--20 N along 64 E with concentrations well over 25 mg alginic acid equivalents l À1 due to upwelling induced productivity. Their concentrations decreased with depth and were lower between 200 and 500 m. Bacterial concentrations were up to 1.99 Â 10 8 l À1 in the surface waters and decreased by an order of magnitude or more at depths below 500 m. A better relationship has been found between bacterial abundance and concentrations of TEP than between bacteria and TOC, indicating that bacterial metabolism is fueled by availability of TEP in the Arabian Sea. Assuming a carbon assimilation of 33%, bacterial carbon demand (BCD) is estimated to be 1.017 to 4.035 g C m À2 d À1 in the surface waters. The observed TEP concentrations appear to be sufficient in meeting the surface and subsurface BCD in the northern Arabian Sea.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

et al. 2000

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“…In previous studies, the high-PUB type dominated in the North Pacific Ocean 2) and the North Atlantic Ocean 7) , while the low-PUB type dominated only in coastal waters of the Arabian Sea 3) , North Atlantic Ocean and Pacific Ocean 8) where the high-PUB type was also found. To understand the ecological role of Synechococcus communities in coastal seas, evaluations of pigment-type composition are important.…”

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confidence: 80%

“…Many phycoerythrin-rich Synechococcus strains have so far been isolated from various marine environments 1,15,16) . They are divided into at least three types using the ratio of PUB to PEB: a no-PUB type, low-PUB type and high-PUB type 2,3,7) .…”

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confidence: 99%

Discrimination of Two Phycoerythrin-Pigment Types of Synechococcus and Their Seasonal Succession in the Uwa Sea

2004

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We identified phycoerythrin-pigment phenotypes of Synechococcus strains in samples obtained from the Uwa Sea, and investigated the seasonal changes in the pigment-type composition of the Synechococcus community in this sea from January 2001 to March 2002. Two Synechococcus strains (UT01 and UT02) with different flow cytometric signatures were isolated by sorting and subsequent culturing. Excitation spectra showed that these two strains possessed different ratios of phycourobilin (PUB) to phycoerythrobilin (PEB). Flow cytometric signatures of the two types were also different; UT01 showed a higher green to red fluorescence ratio than UT02. The ranges of green to red fluorescence intensity of the strains did not overlap, though the strains were cultured under various light intensities (7-160 mE m -2 s -1 ). In seawater samples, we could divide Synechococcus into lowerand higher-PUB types based on the ratio. There were two peaks of total Synechococcus abundance in June (2.8´10 5 cells ml -1 ) and August (1.6´10 5 cells ml -1 ) in the upper layer at a depth of 0 to 15 m. Major types during these two peaks were different; the higher-PUB type contributed 75.6% to the total Synechococcus community in June, and the lower-PUB type, 58.6% in August. This is the first report which describes the seasonal succession of two phycoerythrin-pigment types of Synechococcus in a coastal sea.

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Prochlorococcus

Campbell¹

2003

Encyclopedia of Environmental Microbiology

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Discovery Methods of Detection and Cultivation Description Ecology Physiology and Growth Dynamics of Prochlorococcus Populations Genetic Diversity in Prochlorococcus Populations Phylogeny Genome Sequencing

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Response of microbial community structure to environmental forcing in the Arabian Sea

Cited by 143 publications

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Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

Discrimination of Two Phycoerythrin-Pigment Types of Synechococcus and Their Seasonal Succession in the Uwa Sea

Prochlorococcus

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