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Mandura, A.

doi:10.1023/a:1009927605517

Cited by 63 publications

(23 citation statements)

References 11 publications

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“…The Red Sea ranks amongst the most oligotrophic seas due to lack of river runoff and low nutrient supply (Mandura, 1997), and mangrove trees have been shown to be strongly nutrient limited, particularly by iron, in the Central Red Sea (Almahasheer et al, 2016b). Mangroves in the Central Red Sea develop as dwarf trees (<2 m height) along a narrow belt.…”

Section: Study Areamentioning

confidence: 99%

Leaf Nutrient Resorption and Export Fluxes of Avicennia marina in the Central Red Sea Area

Almahasheer¹,

Duarte²,

Irigoien³

2018

Front. Mar. Sci.

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Red Sea mangroves occur in an oligotrophic sea without permanent freshwater inputs. Understanding the mechanisms to cope with nutrient limitation is, therefore, important to understand their distribution and nutrient dynamics in coastal ecosystems. We measured total number of meristems to estimate their leaves production and nutrients (N, P, and Fe) as a function of age in Avicennia marina leaves. Then estimated resorption rates; the recovery of nutrients from senescing leaves before they are shed in a total of 91 leaf from four different mangroves stands in the Central Red Sea. We found that the concentration of N and P but not Fe declined with age. Nutrient content also declined in the older leaves with high resorption capacity of 69 and 72% in N and P vs. low resorption of 42% in Fe. The role of Fe resorption is poorly studied in plants, nevertheless, this study could provide an insight into our knowledge of iron resorption in the mangroves, which has never been assessed before. The leaf nutrient export flux from senescing leaves in monospecific stand of Avicennia marina was 9, 0.4 and 1 g m −2 year −1 for N, P, and Fe respectively, suggesting mangrove litter-fall to be an important source of bioavailable iron in particular, due to its low resorption, to the adjacent oligotrophic ecosystem.

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Section: Study Areamentioning

confidence: 99%

Leaf Nutrient Resorption and Export Fluxes of Avicennia marina in the Central Red Sea Area

Almahasheer¹,

Duarte²,

Irigoien³

2018

Front. Mar. Sci.

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“…On the other hand, the sea surface temperature declines from south to north (Rushdi, 2015). The Central Red Sea is an arid environment characterized by high temperatures (Table S1 presents the weather conditions during the experiment), sparse rainfall (Edwards, 1987); the mean annual (sporadic) rainfall in Jeddah is 55 mm), high salinity (Bruckner, 2011) and low nutrient inputs and concentrations (Mandura, 1997). The tidal range on the Central Red Sea is only 20 to 30 cm (Sultan et al, 1996), resulting in mangrove habitats that develop as a narrow (typically one to three trees wide) fringe along the shore, adjacent to sand flats that may occasionally be flooded, with desert further inland.…”

Section: Study Areamentioning

confidence: 99%

“…Alternatively, it has been suggested that the reduced size of mangroves could result from other stresses, such as the extremely high temperature and salinity characteristic of the Red Sea region (Douabul and Haddad, 1970). However, mangroves are comparatively taller in the southern area of the Red Sea where salinity is higher than the ocean average, sea surface temperature is higher than in the Central Red Sea and nutrient concentrations are much higher than in the central area, (Mandura et al, 1987;Mandura, 1997), indicating that nutrient availability is the primary factor limiting growth.…”

Section: Introductionmentioning

confidence: 99%

Nutrient Limitation in Central Red Sea Mangroves

2016

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As coastal plants that can survive in salt water, mangroves play an essential role in large marine ecosystems (LMEs). The Red Sea, where the growth of mangroves is stunted, is one of the least studied LMEs in the world. Mangroves along the Central Red Sea have characteristic heights of ∼2 m, suggesting nutrient limitation. We assessed the nutrient status of mangrove stands in the Central Red Sea and conducted a fertilization experiment (N, P and Fe and various combinations thereof) on 4-week-old seedlings of Avicennia marina to identify limiting nutrients and stoichiometric effects. We measured height, number of leaves, number of nodes and root development at different time periods as well as the leaf content of C, N, P, Fe, and Chl a in the experimental seedlings. Height, number of nodes and number of leaves differed significantly among treatments. Iron treatment resulted in significantly taller plants compared with other nutrients, demonstrating that iron is the primary limiting nutrient in the tested mangrove population and confirming Liebig's law of the minimum: iron addition alone yielded results comparable to those using complete fertilizer. This result is consistent with the biogenic nature of the sediments in the Red Sea, which are dominated by carbonates, and the lack of riverine sources of iron.

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“…They are found on flat land between high and low water marks. Mangrove plants constitute a group of about 80 halophytic species that have adapted to survival in saline water (Mandura, 1997). They have an enormous value as habitats, food sources, and refuges for marine organisms (Mandura, 1997).…”

Section: Mangrovesmentioning

confidence: 99%

“…The reefs are particularly well developed in the north and central portions of the sea (Riegl and Luke, 1999;Riegl and Piller, 1999). Mangroves also thrive in the region and are represented by three species: Avicennia marina, Rhizophoramucronata, and Bruguieragymnorhiza (Mandura, 1997), while ten species of seagrass can also be found in the Red Sea (Vittorrio, 2007).…”

Section: Introductionmentioning

confidence: 99%

Tourism Impact on Marine Ecosystems in the North of Red Sea

Lakhouit¹

2019

JSD

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The unique marine environment of the northern Red Sea region is among the richest and most productive marine ecosystems in the world. The sea is populated with extensive algae blooms and at least five types of coral reefs. However, the region’s tourism sector is largely dependent on the surrounding environment, including the coral reefs, which are highly sensitive to human activities. A large tourist project (Neom) is scheduled to be installed in the northern Red Sea, further increasing tourist activities in the area and leading to human intrusion into crucial but fragile marine habitats such as seagrass beds, coral reefs and mangrove stands. The present study investigates how human activities are currently affecting Red Sea ecosystems. Field visits were done in order to investigate and to study human activities impact on marine ecosystems in the north of Red Sea. To the best of our knowledge, this work is the first of its kind to evaluate the impact of tourism on marine ecosystems in Saudi Arabia’s northern Red Sea coast.

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Cited by 63 publications

References 11 publications

Leaf Nutrient Resorption and Export Fluxes of Avicennia marina in the Central Red Sea Area

Leaf Nutrient Resorption and Export Fluxes of Avicennia marina in the Central Red Sea Area

Nutrient Limitation in Central Red Sea Mangroves

Tourism Impact on Marine Ecosystems in the North of Red Sea

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