The intertidal distribution of the grey mangrove (Avicennia marina) in southeastern Australia: The effects of physical conditions, interspecific competition, and predation on propagule establishment and survival

AbstractTo assess trace element concentrations (Zn, Cu, Pb, Cr, Cd and Ni) in the mangrove swamps along the Saudi coast of the Arabian Gulf, thirteen samples of surface sediment and leaves of grey mangrove, Avicennia marina were collected and analyzed. The detected trace element contents (μg g-1) in surface sediments were in the following descending order according to their mean values; Cr (49.18) > Zn (48.48) > Cu (43.06) > Pb (26.61) > Ni (22.88) > Cd (3.21). The results showed that the average concentrations of Cd and Pb exceeded their world average concentration of shale. The geo-accumulation, potential ecological risk and toxicity response indices demonstrated that trace elements have posed a considerable ecological risk, especially Cd. The inter-relationships between physico-chemical characters and trace elements suggests that grained particles of mud represent a noteworthy character in the distribution of trace elements compared to organic materials. Moreover, the results revealed that Zn was clearly bioaccumulated in leaf tissues A. marina. Dredging, landfilling, sewage effluents and oil pollution can be the paramount sources of pollution in the area under investigation.

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Accumulation of trace metals in grey mangrove Avicennia marina fine nutritive roots: The role of rhizosphere processes

Marine Pollution Bulletin ◽

10.1016/j.marpolbul.2013.11.024 ◽

2014 ◽

Vol 79 (1-2) ◽

pp. 284-292 ◽

Cited By ~ 43

Author(s):

Punarbasu Chaudhuri ◽

Bibhash Nath ◽

Gavin Birch

Keyword(s):

Trace Metals ◽

Avicennia Marina ◽

Grey Mangrove ◽

Rhizosphere Processes

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Evaluation of Binding and Abrasion Properties of Grey Mangrove (Avicennia marina) Leaf Extract Against Escherichia coli K12 DNA

Anti-Infective Agents ◽

10.2174/2211352519666210528155419 ◽

2021 ◽

Vol 19 ◽

Author(s):

Praveen Tudu ◽

Shouvik Mahanty ◽

Sushmitha Sriramulu ◽

Punarbasu Chaudhuri ◽

Surajit Pathak

Keyword(s):

Escherichia Coli ◽

Comet Assay ◽

Ethyl Acetate ◽

Ames Test ◽

Leaf Extract ◽

Antimicrobial Properties ◽

Avicennia Marina ◽

Drug Candidate ◽

Escherichia Coli K12 ◽

Grey Mangrove

Background: Mangroves are globally known for their ecological importance and are found to be extensively used in traditional medicine. Avicennia marina, commonly known as grey mangroves exhibit strong antimicrobial properties and are also considered being a promising drug candidate in neutralizing pathogens. Objective: In our present study, the leaf extract from Avicennia marina was isolated using organic solvents of ascensive polarity to evaluate binding and abrasive properties in Escherichia coli K12 DNA. Methods: Samples of the pulverized leaves were used for sequential extraction using ethyl acetate, chloroform and acetone. The minimum inhibitory concentration of isolates from ethyl acetate, chloroform and acetone were quantified to be 0.125gL-1, 0.0625gL-1 and 0.125gL-1, respectively. These values were further utilized to calculate the binding constant between Escherichia coli DNA and isolates. In addition, mutagenicity of the isolates was assessed using Ames test in which the Escherichia coli K12 (strain AB1157) bacteria was cultured in minimal glucose media supplemented with isolates for assessing their DNA modifying ability. Further, DNA abrasion potential was assessed for all the isolates using Comet assay. Results: Results of Ames test showed that the isolates have DNA modifying ability, whereas the Comet assay demonstrated that isolates do not exhibit DNA degrading potential. Conclusion: In conclusion, the mechanism by which the isolates degrade the bacterial cell must be contrary to its DNA degrading potential. Experiments paved the way for further quantification and examination using bioinformatics tools to find the best drug candidate and to run clinical trials

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Algal Competition for Phosphorus: The Influence of Zooplankton and Fish

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f86-141 ◽

1986 ◽

Vol 43 (6) ◽

pp. 1135-1141 ◽

Cited By ~ 44

Author(s):

Helge Reinertsen ◽

Arne Jensen ◽

Arnfinn Langeland ◽

Yngvar Olsen

Keyword(s):

Interspecific Competition ◽

Green Alga ◽

Inorganic Carbon ◽

Blue Green Alga ◽

Physical Conditions ◽

Herbivorous Zooplankton ◽

Enclosure Experiments ◽

Algal Competition

Interspecific competition for phosphorus between the blue-green alga Anabaena flos-aquae and the green alga Staurastrum luetkemuelleri was studied in enclosure experiments. Both algal populations increased in number upon introduction of fish, but addition of herbivorous zooplankton led to an increase solely in the Staurastrum population. This could not be attributed to grazing by zooplankton, chemical or physical conditions (light, pH, inorganic carbon), or the total supply or rate of supply of phosphorus. The observed differences were apparently due to the patchy release of phosphorus by the fish, and the more homogenous release of this nutrient by the zooplankton. This would allow the Anabaena species, which was capable of rapid uptake of temporary pulses of phosphate, to coexist with Staurastrum in the enclosures with fish.

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