Hydrographic indications of advection/convection effects in the Gulf of Elat

Wolf-Vecht, Ann; Paldor, Nathan; Brenner, S.

doi:10.1016/0198-0149(92)90075-5

Cited by 98 publications

(86 citation statements)

References 4 publications

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“…In the summer, a photic layer with a continuous thermocline (surface temperature . 26uC), overlies a thermally homogeneous (20.6uC) deep waters (Wolf-Vecht et al 1992;Post et al 2011). During this period, dissolved inorganic N concentrations in the upper 100 m are at or below the detection limit, and Prochlorococcus dominates the phytoplankton community (Lindell and Post 1995).…”

Section: Methodsmentioning

confidence: 99%

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Distribution and expression of the cyanate acquisition potential among cyanobacterial populations in oligotrophic marine waters

Kamennaya

Post

2013

Limnology & Oceanography

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We assessed the significance of cyanate utilization in marine primary productivity from the distribution of a dedicated transporter (encoded by cynABD) in different ocean environments. Several lines of evidence indicate that the cyanate utilization potential is associated mainly with surface populations of Prochlorococcus. Spatial and temporal dimensions of cynA, cynS, and ntcA expression by picocyanobacteria in the northern Red Sea supported our previous finding that cynA transcripts accumulate under more stringent N-limiting conditions. At the same time, cyanate utilization appeared to be more complex than suggested in our earlier publication, as we showed that picocyanobacteria also express their cyanate utilization potential under conditions where labile organic N compounds, such as urea, accumulate. These include N-sufficient transient conditions that result from nutrient upwelling during early mixing events in autumn as well as during spring bloom conditions that follow deep mixing events. Our finding that cynA occurrence is common in diverse marine environments suggests that cyanate utilization may be of a more fundamental importance to picophytoplankton productivity than previously considered.

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Section: Methodsmentioning

confidence: 99%

“…1820 m deep waterbody (Wolf-Vecht et al 1992). It is subject to an annual cycle of stable summer stratification and deep winter mixing (Genin et al 1995;Post et al 2011).…”

Section: Methodsmentioning

confidence: 99%

Distribution and expression of the cyanate acquisition potential among cyanobacterial populations in oligotrophic marine waters

Kamennaya

Post

2013

Limnology & Oceanography

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“…During the summer months atmospheric dry deposition is a signiWcant source of nutrients to the euphotic zone, supporting transient phytoplankton blooms (Chen et al 2007;Paytan et al 2009). Beginning in the fall, cooling of surface waters initiates convective mixing, and a deeply mixed (300 m or more) water body is observed by winter (Wolf-Vetch et al 1992). Nutrients entrained from depth as a consequence of this mixing result in mesotrophic conditions (Lindell and Post 1995), with productivity likely limited by light (Labiosa et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Picophytoplankton responses to changing nutrient and light regimes during a bloom

et al. 2009

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The spring bloom in seasonally stratiWed seas is often characterized by a rapid increase in photosynthetic biomass. To clarify how the combined eVects of nutrient and light availability inXuence phytoplankton composition in the oligotrophic Gulf of Aqaba, Red Sea, phytoplankton growth and acclimation responses to various nutrient and light regimes were recorded in three independent bioassays and during a naturally-occurring bloom. We show that picoeukaryotes and Synechococcus maintained a "bloomer" growth strategy, which allowed them to grow quickly when nutrient and light limitation were reversed. During the bloom picoeukaryotes and Synechococcus appeared to have higher P requirements relative to N, and were responsible for the majority of photosynthetic biomass accumulation. Following stratiWcation events, populations limited by light showed rapid photoacclimation (based on analysis of cellular Xuorescence levels and photosystem II photosynthetic eYciency) and community composition shifts without substantial changes in photosynthetic biomass. The traditional interpretation of "bloom" dynamics (i.e., as an increase in photosynthetic biomass) may therefore be conWned to the upper euphotic zone where light is not limiting, while other acclimation processes are more ecologically relevant at depth. Characterizing acclimation processes and growth strategies is important if we are to clarify mechanisms that underlie productivity in oligotrophic regions, which account for approximately half of the global primary production in the ocean. This information is also important for predicting how phytoplankton may respond to global warming-induced oligotrophic ocean expansion.

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“…This causes a long residence time for water in the Gulf, with the surface water resident for one year and deeper waters between 3 and 8 years (Reiss & Hottinger, 1984), and combined with a lack of drainage into the straits results in a body of water that although coastal in geographical terms is representative of open ocean water in terms of its nutrient status (Klinker et al, 1976;Wolfvecht et al, 1992). There is a distinct seasonal pattern to the circulation of water in the Gulf, which is characterized by strati¢cation of the water column in the summer months, which disappears and by winter the water column is mixed as nutrient-rich water has risen to the surface (Klinker et al, 1976;Wolfvecht et al, 1992). The Synechococcus and Prochlorococcus community within the Gulf of Aqaba has previously been studied in detail (Fuller et al, 2003(Fuller et al, , 2005.…”

Section: Introductionmentioning

confidence: 99%

A temporal and spatial investigation of cyanophage abundance in the Gulf of Aqaba, Red Sea

Millard

Mann²

2006

J. Mar. Biol. Ass.

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The aim of this study was to determine the abundance of cyanophages over an annual cycle in the Red Sea from the period April 1999 to December 1999 at a range of depths. Cyanophage numbers from 71 water samples were determined by the use of plaque assays using four di¡erent Synechococcus strains. The results indicate that cyanophage are found throughout the water column from surface waters to depths of 150 m, with a discrete maximum in the number of cyanophages in the summer months of July, August and September at a depth of 30 m. Eighty-seven cyanophages were isolated and characterized in terms of host range, genome size and possession of a myoviral portal vertex gene. Cyanophages were found to infect multiple strains of Synechococcus from di¡erent phylogenetic clades. The genome sizes of cyanophages were also found to be bigger than previously estimated.

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Hydrographic indications of advection/convection effects in the Gulf of Elat

Cited by 98 publications

References 4 publications

Distribution and expression of the cyanate acquisition potential among cyanobacterial populations in oligotrophic marine waters

Distribution and expression of the cyanate acquisition potential among cyanobacterial populations in oligotrophic marine waters

Picophytoplankton responses to changing nutrient and light regimes during a bloom

A temporal and spatial investigation of cyanophage abundance in the Gulf of Aqaba, Red Sea

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