Phytoplankton in polluted waters of the Red Sea coast of Yemen

Alkershi, Akram; Menon, Nandini

doi:10.6024/jmbai.2011.53.2.01630-01

Cited by 6 publications

(21 citation statements)

References 9 publications

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“…Over the last two decades, an increase in the number of HAB events has been observed along the Red Sea coast [11–17]. We note that many of these species have been reported to cause severe fish mortalities and numerous ecological impacts in the region [10–14]. However, as the Red Sea remains relatively unexplored, in situ datasets are limited.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, we noticed some uncertainty in the accuracy of the present model when it detects blooms that are spatially less dense, and/or consist of mixed assemblages of different phytoplankton (especially cyanobacteria/diatoms with dinoflagellates). For example, the dinoflagellate N. scintillans/miliaris , which was observed at a low cell density (i.e., cell counts ≈ 4.4 ×10 3 cells L -1 ; see Fig 10f—“st1”), often co-occurred with cyanobacteria/diatoms [14,19]. Hence, the optical properties of the water were influenced by the presence of both organisms [19,41].…”

Section: Discussionmentioning

confidence: 99%

“…During the field program in November 2012 –August 2013, the dinoflagellate K. foliaceum and the cyanobacterium T. erythraeum were reported in the coastal waters of Al Salif and the coast of Al Hodeida City, in the southern Red Sea, respectively [11,12]. The field sampling program conducted in the fisheries landing center at Al Hodeida reported an intense bloom of N. scintillans/miliaris during March 2009 [14]. The in situ study conducted in the Red Sea off the Al Shouqyq coastline (southern Saudi Arabia) on 27 th May 2010 reported a water discoloration caused by H. akashiwo blooms [17].…”

Section: Methodsmentioning

confidence: 99%

“…The first record of the binucleate dinoflagellate K. foliaceum , associated with a diatom endosymbiont, was detected in the coastal waters of Al Salif (southern Red Sea) on 8 th May 2013 [11]. N. scintillans/miliaris , a large heterotrophic dinoflagellate, was detected in the coastal waters of Al Hodeidah, in the southern Red Sea during March 2009 [14]. In the south-central coast of Saudi Arabia, large blooms of H. akashiwo and Ostreopsis sp .…”

Section: Introductionmentioning

confidence: 99%

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Remotely sensing harmful algal blooms in the Red Sea

et al. 2019

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Harmful Algal Blooms (HABs) are of global concern, as their presence is often associated with socio-economic and environmental issues including impacts on public health, aquaculture and fisheries. Therefore, monitoring the occurrence and succession of HABs is fundamental for managing coastal regions around the world. Yet, due to the lack of adequate in situ measurements, the detection of HABs in coastal marine ecosystems remains challenging. Sensors on-board satellite platforms have sampled the Earth synoptically for decades, offering an alternative, cost-effective approach to routinely detect and monitor phytoplankton. The Red Sea, a large marine ecosystem characterised by extensive coral reefs, high levels of biodiversity and endemism, and a growing aquaculture industry, is one such region where knowledge of HABs is limited. Here, using high-resolution satellite remote sensing observations (1km, MODIS-Aqua) and a second-order derivative approach, in conjunction with available in situ datasets, we investigate for the first time the capability of a remote sensing model to detect and monitor HABs in the Red Sea. The model is able to successfully detect and generate maps of HABs associated with different phytoplankton functional types, matching concurrent in situ data remarkably well. We also acknowledge the limitations of using a remote-sensing based approach and show that regardless of a HAB’s spatial coverage, the model is only capable of detecting the presence of a HAB when the Chl-a concentrations exceed a minimum value of ~ 1 mg m -3 . Despite the difficulties in detecting HABs at lower concentrations, and identifying species toxicity levels (only possible through in situ measurements), the proposed method has the potential to map the reported spatial distribution of several HAB species over the last two decades. Such information is essential for the regional economy (i.e., aquaculture, fisheries & tourism), and will support the management and sustainability of the Red Sea’s coastal economic zone.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Remotely sensing harmful algal blooms in the Red Sea

et al. 2019

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“…The Red Sea possesses a unique geography, as it is almost entirely locked by land, and its ecosystems are diverse, including mangrove, macro-algae and coral reefs (Alkershi and Menon, 2011 ). The Red Sea encompasses two gulfs, the Gulf of Suez and the Gulf of Aqaba, in addition to the Red Sea proper.…”

Section: Introductionmentioning

confidence: 99%

Egypt's Red Sea coast: phylogenetic analysis of cultured microbial consortia in industrialized sites

Mustafa

Abd‐Elgawad²,

Abdel-Haleem

et al. 2014

Front. Microbiol.

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The Red Sea possesses a unique geography, and its shores are rich in mangrove, macro-algal and coral reef ecosystems. Various sources of pollution affect Red Sea biota, including microbial life. We assessed the effects of industrialization on microbes along the Egyptian Red Sea coast at eight coastal sites and two lakes. The bacterial communities of sediment samples were analyzed using bacterial 16S rDNA pyrosequencing of V6-V4 hypervariable regions. The taxonomic assignment of 131,402 significant reads to major bacterial taxa revealed five main bacterial phyla dominating the sampled sites: Proteobacteria (68%), Firmicutes (13%), Fusobacteria (12%), Bacteriodetes (6%), and Spirochetes (0.03%). Further analysis revealed distinct bacterial consortia that primarily included (1) marine Vibrio spp.—suggesting a “marine Vibrio phenomenon”; (2) potential human pathogens; and (3) oil-degrading bacteria. We discuss two divergent microbial consortia that were sampled from Solar Lake West near Taba/Eilat and Saline Lake in Ras Muhammad; these consortia contained the highest abundance of human pathogens and no pathogens, respectively. Our results draw attention to the effects of industrialization on the Red Sea and suggest the need for further analysis to overcome the hazardous effects observed at the impacted sites.

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Heliomycin and tetracinomycin D: anthraquinone derivatives with histone deacetylase inhibitory activity from marine sponge-associated Streptomyces sp. SP9

et al. 2018

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Several actinomycetes strains were isolated from different marine sponges collected from the Red Sea shore in Egypt. The efficiency of their crude extracts to inhibit histone deacetylase (HDAC) enzyme was investigated in the nuclear extract of Hela cell line. The crude extract corresponding to sp. SP9 isolated from the marine sponge showed a promising HDAC inhibitory activity with 64 and 81% at 50 and 100 µg/ml, respectively. The strain was identified as sp. by phylogenetic analyses based on its 16S rRNA gene sequence. The major compounds of sp. SP9 were isolated and purified by different chromatographic methods. The chemical structure of the isolated compounds was identified on the basis of their spectroscopic data including mass, H andC NMR, and by comparison with those of authenticated samples. Structures of compounds and were established as heliomycin and tetracenomycin D, respectively. These compounds exhibited HDAC inhibitory activities with IC values of 29.8 ± 0.04 µg/ml for heliomycin () and 10.9 ± 0.02 µg/ml for tetracenomycin D (). A computational docking study for compounds and against HDAC1, HDAC2, and HDAC3 was performed to formulate a hypothetical mechanism by which the tested compounds inhibit HDAC. Tetracenomycin D () showed a good binding interactions with HDAC2 (- 5.230 kcal/mol) and HDAC3 (- 6.361 kcal/mol).

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Phytoplankton in polluted waters of the Red Sea coast of Yemen

Cited by 6 publications

References 9 publications

Remotely sensing harmful algal blooms in the Red Sea

Remotely sensing harmful algal blooms in the Red Sea

Egypt's Red Sea coast: phylogenetic analysis of cultured microbial consortia in industrialized sites

Heliomycin and tetracinomycin D: anthraquinone derivatives with histone deacetylase inhibitory activity from marine sponge-associated Streptomyces sp. SP9

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