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Ecological Hazards of Some Pesticides on Unicellular Freshwater Green Alga; Pseudokirchneriella subcapitata

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Last updated: 01 Jan 2025

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Abstract

Aquatic toxicity and differential sensitivity of different pesticide categories on freshwater green alga; Pseudokirchneriella subcapitata were investigated. In this context, growth-inhibiting tests of 14 pesticides (including 4 fungicides; 4 acaricides/ nematicides and 6 insecticides) were carried out.  Based on IC50 values, P. subcapitata was more sensitive to many pesticides (mostly fungicides and acaricides/ nematicides) and less sensitive to insecticides. The test alga was tolerant to carbendazim, while it was highly susceptible to prochloraz. The 96-h IC50 values for imidazole and benzimidazole fungicides; prochloraz and thiallophanate-methyl varied around 0.26 and 80.81 mg/L; respectively, while organophosphates (chlorpyrifos-methyl, chlorpyrifos, profenofos, fenamifos, malathion and dimethoate) varied in their toxicities from 1.01 to 42.67 mg/L. Furthermore, carbamates (mancozeb, methomyl, carbosulfan and carbendazim) showed different patterns of IC50s (0.27, 72.96, 246.06 and 393.26 mg/L; respectively). According to estimated risk phrases, the decreasing order of the potential aquatic ecosystem risk imposed by the tested pesticides was prochloraz > mancozeb+metalaxyl > chlorpyrifos-methyl > chlorpyrifos > imidaclopride > profenofos > fenamifos > malathion > dimethoate > methomyl > thiallophanate-methyl > carbosulfan > mineral oil > carbendazim. In conclusion, the results of this study clearly emphasize the importance of estimating risk phrases when assessing the pesticide stress on aquatic ecosystems and indicated that the tested pollutants may imbalance the aquatic ecosystem and cause a shift of algal species dominance. Such speculations need further more studies to fully understand the processes involved in pesticide toxicity.
 

DOI

10.21608/asejaiqjsae.2012.3139

Keywords

Pesticides, toxicity, green algae, risk phrases

Authors

First Name

Salwa

Last Name

M. Abd-Allah

MiddleName

-

Affiliation

Mammalian and Aquatic Toxicity Dept., Central Lab of Agricultural Pesticides, Agricultural Research Center, Alexandria, Egypt.

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Orcid

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First Name

Neama

Last Name

A. Goud

MiddleName

-

Affiliation

Pesticide Chemistry and Toxicology Dept., Faculty of Agriculture (Fuka Branch)Alexandria University, Marsa Matrouh, Egypt.

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City

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Orcid

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First Name

Madiha

Last Name

M. Talha

MiddleName

-

Affiliation

Mammalian and Aquatic Toxicity Dept., Central Lab of Agricultural Pesticides, Agricultural Research Center, Alexandria, Egypt.

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Orcid

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Volume

33

Article Issue

January-March

Related Issue

550

Issue Date

2012-01-01

Receive Date

2012-02-15

Publish Date

2012-03-30

Page Start

18

Page End

25

Print ISSN

1110-0176

Online ISSN

2536-9784

Article File

ASEJAIQJSAE_Volume 33_Issue January-March_Pages 18-25.pdf

PDF . 410.0kB

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https://asejaiqjsae.journals.ekb.eg/article_3139.html

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https://asejaiqjsae.journals.ekb.eg/service?article_code=3139

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Original Article

Type Code

53

Publication Type

Journal

Publication Title

Alexandria Science Exchange Journal

Publication Link

https://asejaiqjsae.journals.ekb.eg/

MainTitle

Ecological Hazards of Some Pesticides on Unicellular Freshwater Green Alga; Pseudokirchneriella subcapitata

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Article

Created At

22 Jan 2023