Papers by Ferdius Ferdaus
A possible tributyltin (TBT)-degrading bacterium isolated from contaminated surface sediment was ... more A possible tributyltin (TBT)-degrading bacterium isolated from contaminated surface sediment was successfully identified as Klebsiella sp. FIRD 2. It was found to be the best isolate capable of resisting TBT at a concentration of 1000 μg L− 1. This was a concentration above the reported contaminated level at the sampling station, 790 μg L− 1. Further studies revealed that the isolate was Gram negative and resisted TBT concentrations of up to 1500 μg L− 1 in a Minimal Salt Broth without the addition of any carbon source within the first 48 h of incubation. It is expected that additional work could be conducted to check the degradation activity of this new isolate and possibly im- prove the degradation capacity in order to contribute to finding a safe and sustainable remediation solution of TBT contamination
Present study utilized stable isotope markers of carbon-13 ( 13 C) and nitrogen-15 ( 15 N) to ind... more Present study utilized stable isotope markers of carbon-13 ( 13 C) and nitrogen-15 ( 15 N) to indicate existing food web in an intertidal mudflat of Sungai Janggut, Selangor, Malaysia and also the relative contribution of primary producers to the diets of consumers. The δ 13 C values of algae was -18.69 ± 0.7‰, detritus -24.38 ± 0.9‰, invertebrates -15.25 ± 0.1 to -21.39 ± 0.1‰ and fishes -16.17 to -21.45 ± 0.2‰. The δ 15 N values of algae was 2.52 ± 0.1‰, detritus 1.53 ± 0.1‰, invertebrates 4.33 ± 0.4 to 8.97 ± 0.5‰ and fishes 9.54 ± 0.3 to 12.81 ± 0.4‰. This showed the assimilation of carbon and nitrogen from variety of sources in mangrove ecosystem. In general, organisms had more positive value of carbon than algae and detritus, indicating a metabolic shift in isotope ratios. This was particular; the average carbon in animal isotope ratio was 0.4‰ and 5.9‰ more positive than mean ratio of algae and detritus. Although there have no obvious systematic trophic enrichment in δ 13 C, the value of δ 15 N is good enough to demonstrate the existence of a food web in mangrove ecosystem of Sungai Janggut. Further investigations are needed to gather enough information in order to design an accurate and comprehensive model of the food web in a mangrove ecosystem.
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Papers by Ferdius Ferdaus