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Neustonic versus epiphytic bacteria of eutrophic lake and their biodegradation ability on deltamethrin.

Kalwasińska A, Kęsy J, Wilk I, Donderski W - Biodegradation (2010)

Bottom Line: This study evaluated biodegradation of the insecticide deltamethrin (1 μg l(-1)) by pure cultures of neustonic (n = 25) and epiphytic (n = 25) bacteria and by mixed cultures (n = 1), which consisted of a mixture of 25 bacterial strains isolated from the surface microlayer (SM ≈ 250 μm) and epidermis of the Common Reed (Phragmites australis, (Cav.) Trin. ex Steud.) growing in the littoral zone of eutrophic lake Chełmżyńskie.Results indicate that neustonic and epiphytic bacteria are characterized by a similar average capacity to degrade deltamethrin.After a 15-day incubation, bacteria isolated from the surface microlayer reduced the initial concentration of deltamethrin by 60%, while the average effectiveness of the bacteria found on the Common Reed equaled 47%.

View Article: PubMed Central - PubMed

Affiliation: Department of Water Microbiology and Biotechnology, Nicolaus Copernicus University, Gagarina 9, 87-100, Toruń, Poland. kala@umk.pl

ABSTRACT
This study evaluated biodegradation of the insecticide deltamethrin (1 μg l(-1)) by pure cultures of neustonic (n = 25) and epiphytic (n = 25) bacteria and by mixed cultures (n = 1), which consisted of a mixture of 25 bacterial strains isolated from the surface microlayer (SM ≈ 250 μm) and epidermis of the Common Reed (Phragmites australis, (Cav.) Trin. ex Steud.) growing in the littoral zone of eutrophic lake Chełmżyńskie. Results indicate that neustonic and epiphytic bacteria are characterized by a similar average capacity to degrade deltamethrin. After a 15-day incubation, bacteria isolated from the surface microlayer reduced the initial concentration of deltamethrin by 60%, while the average effectiveness of the bacteria found on the Common Reed equaled 47%.

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Deltamethrin—structural formula
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Fig1: Deltamethrin—structural formula

Mentions: Deltamethrin (Fig. 1) is a pyrethroid insecticide used widely in agriculture, including vegetable, fruit, and ornamental plant farming, and in forestry to control gnawing and sucking pest. It is a contact and systemic neurotoxin that strongly affects neurotransmitters in the central and peripheral nervous system (Narahashi 1996). Deltamethrin is characterized by advanced toxic properties, which means that it can be used in very small doses in comparison to the previously used active substances. Concentrations of this insecticide found in surface waters range from 0.04 to 24.0 μg l−1 (Pawlish et al. 1998). The half-life of deltamethrin in water ranges from 2 to 4 h. In laboratory condition, this substance shows high toxicity to fish, aquatic arthropods, and bees (Różański 1992). In the aquatic environment, pyrethroids undergo spontaneous hydrolysis, particularly in the environment with high pH (Sogorb and Vilanova 2002) and are subject to enzymatic degradation by enzymes produced by microorganisms (Demoute 2006).Fig. 1


Neustonic versus epiphytic bacteria of eutrophic lake and their biodegradation ability on deltamethrin.

Kalwasińska A, Kęsy J, Wilk I, Donderski W - Biodegradation (2010)

Deltamethrin—structural formula
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3104139&req=5

Fig1: Deltamethrin—structural formula
Mentions: Deltamethrin (Fig. 1) is a pyrethroid insecticide used widely in agriculture, including vegetable, fruit, and ornamental plant farming, and in forestry to control gnawing and sucking pest. It is a contact and systemic neurotoxin that strongly affects neurotransmitters in the central and peripheral nervous system (Narahashi 1996). Deltamethrin is characterized by advanced toxic properties, which means that it can be used in very small doses in comparison to the previously used active substances. Concentrations of this insecticide found in surface waters range from 0.04 to 24.0 μg l−1 (Pawlish et al. 1998). The half-life of deltamethrin in water ranges from 2 to 4 h. In laboratory condition, this substance shows high toxicity to fish, aquatic arthropods, and bees (Różański 1992). In the aquatic environment, pyrethroids undergo spontaneous hydrolysis, particularly in the environment with high pH (Sogorb and Vilanova 2002) and are subject to enzymatic degradation by enzymes produced by microorganisms (Demoute 2006).Fig. 1

Bottom Line: This study evaluated biodegradation of the insecticide deltamethrin (1 μg l(-1)) by pure cultures of neustonic (n = 25) and epiphytic (n = 25) bacteria and by mixed cultures (n = 1), which consisted of a mixture of 25 bacterial strains isolated from the surface microlayer (SM ≈ 250 μm) and epidermis of the Common Reed (Phragmites australis, (Cav.) Trin. ex Steud.) growing in the littoral zone of eutrophic lake Chełmżyńskie.Results indicate that neustonic and epiphytic bacteria are characterized by a similar average capacity to degrade deltamethrin.After a 15-day incubation, bacteria isolated from the surface microlayer reduced the initial concentration of deltamethrin by 60%, while the average effectiveness of the bacteria found on the Common Reed equaled 47%.

View Article: PubMed Central - PubMed

Affiliation: Department of Water Microbiology and Biotechnology, Nicolaus Copernicus University, Gagarina 9, 87-100, Toruń, Poland. kala@umk.pl

ABSTRACT
This study evaluated biodegradation of the insecticide deltamethrin (1 μg l(-1)) by pure cultures of neustonic (n = 25) and epiphytic (n = 25) bacteria and by mixed cultures (n = 1), which consisted of a mixture of 25 bacterial strains isolated from the surface microlayer (SM ≈ 250 μm) and epidermis of the Common Reed (Phragmites australis, (Cav.) Trin. ex Steud.) growing in the littoral zone of eutrophic lake Chełmżyńskie. Results indicate that neustonic and epiphytic bacteria are characterized by a similar average capacity to degrade deltamethrin. After a 15-day incubation, bacteria isolated from the surface microlayer reduced the initial concentration of deltamethrin by 60%, while the average effectiveness of the bacteria found on the Common Reed equaled 47%.

Show MeSH