Deviations in the biochemical structure of some macroalgal species and their relation to the environmental conditions in Qarun Lake, Egypt

Haroon, Amany M.; Hussian, Abd-Ellatif M.; El-Sayed, Seliem M.

doi:10.1016/j.ejar.2018.02.006

Cited by 20 publications

(10 citation statements)

References 14 publications

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“…The reduced salinity and RS concentrations in the D region coupled with bacterial community shifts on the thalli highly supports this observation. Low salinity areas are suitable for the growth and infection of Pythium (Ding and Ma, 2005; Klochkova et al, 2017) and the role of RS in the growth of macroalgae is somewhat established (Mehdipour et al, 2015; Haroon et al, 2018), although a direct relationship between RS, and the physical status of P. yezoensis has been poorly revealed. Taken together, the bacterial taxa that significantly correlated with both salinity and RS, which included two OTUs (OTU6 and OTU7) on P. yezoensis and twelve OTUs (OTU8, OTU9, OTU2, OTU12, OTU13, OTU22, OTU18, OTU24, OTU14, OTU21, OTU10, and OTU1) in seawater, are likely to be more reliable potential health-status indicators for P. yezoensis .…”

Section: Discussionmentioning

confidence: 99%

Compositional Shifts of Bacterial Communities Associated With Pyropia yezoensis and Surrounding Seawater Co-occurring With Red Rot Disease

et al. 2019

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Pyropia yezoensis is commercially the most important edible red alga in China, and red rot disease is viewed as one of the major constraints for its cultivation. Microbes within the oomycetic genus Pythium have been reported as the causative agents for this disease; however, little is known about the interactions between the disease and the epiphytic and planktonic bacterial communities. In the present study, bacterial communities associated with uninfected, locally infected, and seriously infected thalli collected from cultivation farms, and within seawater adjacent to the thalli, were investigated using in-depth 16S ribosomal RNA (rRNA) gene sequencing in conjunction with assessing multiple environmental factors. For both thalli and seawater, uninfected and infected communities were significantly different though alpha diversity was similar. Phylogenetic differences between epiphytic bacterial communities associated with P. yezoensis were mainly reflected by the relative changes in the dominant operational taxonomic units (OTUs) assigned as genus Flavirhabdus , genus Sulfitobacter , and family Rhodobacteraceae. The prevalent OTUs in seawater also differed in relative abundance across the communities and were affiliated with diverse taxa, including the phyla Actinobacteria, Verrucomicrobia, and Bacteroidetes, and the classes Alpha- and Gamma-proteobacteria. The differentiation of bacterial communities associated with P. yezoensis and seawater was primarily shaped by reactive silicate (RS) content and salinity, respectively. In particular, 14 potential indicators (two OTUs on P. yezoensis and twelve OTUs in seawater) were identified that significantly differentiated P. yezoensis health statuses and correlated with environmental changes. Overall, the present study provides insights into the alterations of bacterial communities associated with P. yezoensis and surrounding seawater co-occurring with red rot disease. Observed changes were closely associated with health status of algal host, and highlight the potential of using community differentiation to forecast disease occurrence.

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Section: Discussionmentioning

confidence: 99%

Compositional Shifts of Bacterial Communities Associated With Pyropia yezoensis and Surrounding Seawater Co-occurring With Red Rot Disease

et al. 2019

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“…Physiochemical characteristics of Qaroun lake were monitored during 12 months and the results varied according to the parameters and sites. Temperature is one of the most important factors affecting aquatic organisms likewise the chemical and physical characteristics of the water (Abdo, 2003;Haroon et al, 2018). The changes in temperature values rely mainly upon the seasonal variation, time of sampling and additionally influenced by special characteristics of water environment such as degree of transparence, wind force and evaporation (Mahmoud, 2002;Tayel, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Lake Qaroun is found "between longitudes of 30°24` & 30° 49` E and latitude of 29° 24` & 29° 33` N Figure (1). It's finite from its northern part by the desert and by agricultural land from its south and south eastern part (Hussein et al, 2008;Haroon et al, 2018). The lake receives agricultural discharged water from the encircling agricultural land.…”

Section: Study Areamentioning

confidence: 99%

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Monitoring some pathogenic bacteria in water and fish of Lake Qaroun

Sabry

Tolba

Abdel‐Gawad

2018

Egypt. J. of Aquatic Biolo. and Fish.

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Water quality plays a vital role in the productivity of lake's fish. Lake Qaroun is exposed to untreated agricultural, domestic and industrial effluents which are considered serious pollutents. This study was conducted to monitor the water quality of the lake and the pathogenic bacteria in the surface water and fish. Physico-chemical parameters of water and bacterial count of water and two types of fish Tilapia zillii and Mugil cephalus were studied. Samples were collected from four sites at certain distances from El-Batts drain in the lake during 2015-2016. Physical characteristics of the water showed that the water temperature varied between 16 and 30 o C, pH was alkaline. Water salinity and disolved oxygen decreased near El-Batts drain, while the chemical oxygen demand, amonia and nitrate levels were high due to the pollution and bacterial activity. Bacteriological characteriztion revealed that the bacterial load in the nearest point to El-Batts drain was higher than the other examined sites of lake water. The total and fecal coliform near El-Batts drain exceeded the Egyptian standard limits; it reached 4.4x10 7 in summer. The study revealed that the bacterial pathogens counts in fish were high in mullet species than that of tilapia. Total and fecal coliforms were detected in muscles once during the study period; in spring for tilapia and in summer for mullet fish. The study revealed that Aeromonas hydrophila was the most prevalant pathogen isolated from Tilapia zillii and Mugil cephalus and that 72% of A. hydrophila harboured aerolysin toxin gene. A. hydrophila was detected in muscles of both tilapia and mullet during the four seasons through 12 months, while S. aureus and P. aeruginosa were detected only in summer or spring. The study highlights the hazardous effect of the untreated domestic and industrial drainage wastes on water quality and fish of Lake Qaroun.

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“…The values of lake water salinity listed in Table (1) are approximately the same as obtained lay Ragab (2017). Thus, Haroon et al (2018) cited that lake Qarun is considered saline water.…”

Section: Physicochemical Parameters Of Lake Watermentioning

confidence: 99%

Seasonal and regional variations of five heavy metals in water, sediments and fishes inhabiting Lake Qarun, Egypt

Elwasify

Ghanem

El-Bamby

et al. 2019

Al-Azhar Journal of Agricultural Research

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The study was conducted during the period from October 2015 to September 2016 to investigate the accumulation of five heavy metals in three fish species (Tilapia zillii, Solea solea and Mugil cephalus) inhabiting lake Qarun, Egypt. Water, sediments and fish samples were collected from six sites cover eastern, middle and western sectors of the lake during the four studied seasons. The results indicated that, summer time showed the highest pH, salinity, biological oxygen demand and nitrates concentration, while autumn and spring times showed the highest nitrites concentration depending on the site. The abundance of metals in lake water, sediments and fish followed the order: Fe > Zn ≈ Mn > Cu > Cd. In all fish species Fe and Zn exceeded the permissible limits. Regardless fish species, the highest concentrations of metals were recorded in fish liver, while the lowest in fish muscles. Mugil species seemed to be more contaminated with metals than the other species. It is recommended to coordinate different efforts to rescue Lake Qarun from heavy metal pollution.

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Deviations in the biochemical structure of some macroalgal species and their relation to the environmental conditions in Qarun Lake, Egypt

Cited by 20 publications

References 14 publications

Compositional Shifts of Bacterial Communities Associated With Pyropia yezoensis and Surrounding Seawater Co-occurring With Red Rot Disease

Compositional Shifts of Bacterial Communities Associated With Pyropia yezoensis and Surrounding Seawater Co-occurring With Red Rot Disease

Monitoring some pathogenic bacteria in water and fish of Lake Qaroun

Seasonal and regional variations of five heavy metals in water, sediments and fishes inhabiting Lake Qarun, Egypt

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