Dual-level toxicity assessment of biodegradable pesticides to aquatic species
The use of ecological models to assess the effects of pesticides on the structure and function of aquatic ecosystems is of growing interest. Of utmost concern is assessment of pesticides that have the potential to biodegrade into metabolites that are as toxic as the parent pesticide. In this work, a...
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| Published in | Ecological complexity Vol. 45; p. 100911 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
01.01.2021
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| Abstract | The use of ecological models to assess the effects of pesticides on the structure and function of aquatic ecosystems is of growing interest. Of utmost concern is assessment of pesticides that have the potential to biodegrade into metabolites that are as toxic as the parent pesticide. In this work, a mathematical model to predict and evaluate the effect of two pesticides on the population of aquatic biospecies where both pesticides are bio-available in water and sediments with one of the pesticides capable of biodegrading into the other but not vice versa is formulated and analyzed. Conditions for nonlinear stability, instability and Hopf-bifurcation are obtained. The model undergoes a Hopf-bifurcation when the rate of discharge of pesticides crosses a critical value, so that the population of the aquatic species follows an oscillatory pattern. Four hypotheses involving the concentration of the pesticides and the population of the aquatic species where qualitatively investigated: the aquatic species will completely die out with time, the population of the aquatic biospecies will remain under certain conditions, the pesticide will continually remain in water and there will be a periodic variation in the population of the aquatic species over time. Results also indicate that the biodegradation potential of one of the pesticides had significant effect on the population dynamics of the aquatic species. |
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| AbstractList | The use of ecological models to assess the effects of pesticides on the structure and function of aquatic ecosystems is of growing interest. Of utmost concern is assessment of pesticides that have the potential to biodegrade into metabolites that are as toxic as the parent pesticide. In this work, a mathematical model to predict and evaluate the effect of two pesticides on the population of aquatic biospecies where both pesticides are bio-available in water and sediments with one of the pesticides capable of biodegrading into the other but not vice versa is formulated and analyzed. Conditions for nonlinear stability, instability and Hopf-bifurcation are obtained. The model undergoes a Hopf-bifurcation when the rate of discharge of pesticides crosses a critical value, so that the population of the aquatic species follows an oscillatory pattern. Four hypotheses involving the concentration of the pesticides and the population of the aquatic species where qualitatively investigated: the aquatic species will completely die out with time, the population of the aquatic biospecies will remain under certain conditions, the pesticide will continually remain in water and there will be a periodic variation in the population of the aquatic species over time. Results also indicate that the biodegradation potential of one of the pesticides had significant effect on the population dynamics of the aquatic species. |
| ArticleNumber | 100911 |
| Author | Achema, K.O. Okuonghae, D. Tongo, I. |
| Author_xml | – sequence: 1 givenname: K.O. surname: Achema fullname: Achema, K.O. email: adonaipoly34@gmail.com organization: Graduate Student, Department of Mathematics, University of Benin, Benin City, Nigeria – sequence: 2 givenname: D. surname: Okuonghae fullname: Okuonghae, D. email: daniel.okuonghae@uniben.edu organization: Department of Mathematics, University of Benin, Benin City, Nigeria – sequence: 3 givenname: I. surname: Tongo fullname: Tongo, I. email: isioma.tongo@uniben.edu organization: Department of Animal and Environmental Biology, University of Benin, Benin City, Nigeria |
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| Cites_doi | 10.1007/s10646-004-6371-x 10.1007/BF02747550 10.1016/j.scitotenv.2012.12.032 10.5897/AJMR2016.8402 10.1007/s40808-016-0203-x 10.1111/ele.12295 10.1006/jmaa.1994.1079 10.1016/j.ecoenv.2012.11.031 10.3329/jasbs.v39i1.16036 10.1016/0304-3800(83)90019-4 10.1002/etc.2210 10.1016/j.jece.2016.12.035 10.1002/ps.1178 10.1016/j.catena.2014.03.013 |
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Sci. doi: 10.1002/ps.1178 contributor: fullname: Ntow – volume: 199 start-page: 97 year: 2014 ident: 10.1016/j.ecocom.2021.100911_bib0008 article-title: Application date as controlling factor of pesticide transfers to surface water during runoff events publication-title: Catena doi: 10.1016/j.catena.2014.03.013 contributor: fullname: Boithias |
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| Title | Dual-level toxicity assessment of biodegradable pesticides to aquatic species |
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