Nutrient fluxes from deep sediment support nutrient budget in the oligotrophic waters of the Gulf of Aqaba

Rasheed, Mohammed; Al-Rousan, Saber; Manasrah, Riyad; Al‐Horani, Fuad A.

doi:10.1007/s10872-006-0034-x

Cited by 19 publications

(17 citation statements)

References 35 publications

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“…On the other hand, the occasionally high nutrients recorded in the epipelagic zone in the present study assume enrichment from the coastal rich waters, particularly those adjacent to the coral reef. A rough estimation of nutrients enrichment to the Gulf of Aqaba is about 3.3 × 10 5 , 6.4 × 10 4 and 6.5 × 10 6 kg year-1 of inorganic nitrogen, phosphate and silicate respectively (Rasheed et al, 2006), in addition to nutrient concentrations in reef cavities (Ayukai, 1993;Richter et al, 2001;Rasheed et al, 2002). The average phytoplankton biomass (Chlorophyll a) in the epipelagic zone in the present study was 0.28 µg l -1 .…”

Section: Discussionmentioning

confidence: 47%

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Environmental properties of the southern Gulf of Aqaba, Red Sea, Egypt

2012

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Environmental properties (temperature, dissolved oxygen, nutrients and chlorophyll a) of the epipelagic zone off Sharm El-Sheikh, Red Sea, Egypt were studied seasonally throughout a year from March 1995 to March 1996. Water samples were collected from five water depths (0, 25, 50, 75 & 100 m). The studied parameters exhibited clear seasonal variability along the water column. The vertical distribution of water temperature showed thermal homogeneity during most seasons, and thermal stratification in summer. Dissolved oxygen attained slightly high concentrations (5.3-7.8 mg l -1 ) in the whole water column, with slight seasonal variation. The concentrations of nutrients reflected dominant oligotrophic conditions in the epipelagic zone and occasional mesotrophic status at some depths. Phosphate fluctuated between 0-0.7 μM, ammonium (0-2.27 μM), nitrite (0-0.72 μM), nitrate (0-1.49 μM) and silicate (0-6.48 M). Phytoplankton biomass was generally low in the epipelagic zone throughout the study, whereas chlorophyll a was less than 0.5 μg l -1 , except relatively high concentration (0.7-1.12 μg l -1 ) in deep layers in spring. In comparison with previous studies on the Gulf of Aqaba all environmental parameters during present study showed pronouncedly different values.

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Section: Discussionmentioning

confidence: 47%

“…The oligotrophic conditions have been frequently reported in the Gulf of Aqaba (Cornils et al, 2005;Al-Najjar et al, 2006;Rasheed et al, 2006;El-Sherbiny et al, 2007.…”

Section: Discussionmentioning

confidence: 72%

Environmental properties of the southern Gulf of Aqaba, Red Sea, Egypt

2012

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“…The concentrations recorded most of the time were in fact 100% saturation concentrations. Waters of the Gulf of Aqaba are very well balanced in terms of respiration and photosynthesis and well ventilated due to the annual deep mixing (Badran 2001;Rasheed et al, 2006;Manasrah et al, 2006). This highlights temperature and salinity as the two main factors controlling the dissolved oxygen concentration, because of the strong dependence of the oxygen solubility on these two variables.…”

Section: Dissolve Oxygenmentioning

confidence: 99%

“…The typical behavior of these two nutrient species is that they almost vanish during the summer and grow abundantly in the winter (Badran & Foster, 1998;Al-qutob et al, 2002;Rasheed et al, 2006). This is due to their rapid consumption by the primary productivity during the summer and the thermal stratification in the water column that prevents new inputs to reach the euphotic zone from the deeper waters.…”

Section: Nitrate and Nitritementioning

confidence: 99%

“…Nutrient concentrations build up in deep water during summer due to the efficient decomposition of organic matter and the lack of primary productivity (Levanon-Spanier et al, 1979;Klinker et al, 1978). In winter, the water column is well mixed and whatever is consumed by the primary productivity is substituted for or even exceeded by entrainment from deep waters (Levanon-Spanier et al, 1979;Klinker et al, 1978;Rasheed et al, 2006).…”

Section: Nitrate and Nitritementioning

confidence: 99%

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Long-Term Water Quality Monitoring at an Industrial Site on the Northern Gulf of Aqaba, Red Sea

Rasheed

Al-Trabeen

Badran³

2012

Medit. Mar. Sci.

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The present study focuses on seawater samples collected monthly, for 12 years (June 1998 to December 2010), within the framework of the sustainable monitoring program in front of the Industrial Complex (IC) Aqaba Jordan. In situ measurements of temperature, salinity, pH and dissolved oxygen have been recorded, for three different depths, at six different stations. Also, samples have been collected and analyzed for inorganic nutrients, fluoride and sulfate. The data collected, when compared with the offshore waters, showed the dominance of natural Aqaba seawater conditions for most variables throughout the year. Phosphate concentrations were slightly higher in some sampling events. This, however, did not exert any considerable effect on the environmental quality of the seawater, mainly because anthropogenic phosphate reaching the sea does with the help of the wind in very limited amounts and insoluble form. Also, phosphate is not the primary productivity limiting nutrient in the waters of the Gulf of Aqaba.

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Is increased calcarinid (foraminifera) abundance indicating a larger role for macro-algae in Indonesian Plio-Pleistocene coral reefs?

Renema

2009

Coral Reefs

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Nutrient fluxes from deep sediment support nutrient budget in the oligotrophic waters of the Gulf of Aqaba

Cited by 19 publications

References 35 publications

Environmental properties of the southern Gulf of Aqaba, Red Sea, Egypt

Environmental properties of the southern Gulf of Aqaba, Red Sea, Egypt

Long-Term Water Quality Monitoring at an Industrial Site on the Northern Gulf of Aqaba, Red Sea

Is increased calcarinid (foraminifera) abundance indicating a larger role for macro-algae in Indonesian Plio-Pleistocene coral reefs?

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