Ecotoxicological Effects of Imidacloprid and Lambda-Cyhalothrin (Insecticide) on Tadpoles of the African Common Toad, Amietophrynus Regularis (Reuss, 1833) (Amphibia: Bufonidae)
Agriculture is the main activity carried out in Cameroon and pesticide use is believed to be a common rule for its success. Most of the farms are situated close to water bodies, thus constituting a potential risk to non-target aquatic organisms. Declines of amphibian populations have been a worldwid...
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Ital Publication
2017-09-01
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| Series: | Emerging Science Journal |
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| Online Access: | https://ijournalse.org/index.php/ESJ/article/view/22 |
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| author | Daniel Brice Kenko Nkontcheu Norbert Ngameni Tchamadeu Francis Ngealekeleoh Stella Nchase |
| author_facet | Daniel Brice Kenko Nkontcheu Norbert Ngameni Tchamadeu Francis Ngealekeleoh Stella Nchase |
| author_sort | Daniel Brice Kenko Nkontcheu |
| collection | DOAJ |
| description | Agriculture is the main activity carried out in Cameroon and pesticide use is believed to be a common rule for its success. Most of the farms are situated close to water bodies, thus constituting a potential risk to non-target aquatic organisms. Declines of amphibian populations have been a worldwide issue of concern for the scientific community during the last several decades. The aim of this study was to assess the effects of an insecticide used by local farmers in Buea on amphibians. Parastar 40WP® which is constituted of imidacloprid + lambda-cyhalothrin a commonly used insecticide was applied on tadpoles of the African common toad Amietophrynus regularis (Reuss, 1833) in a static renewal experiment. The acute toxicity test was carried out after a range finding test from which seven test concentrations were selected. These concentrations were 0.0025mg/l, 0.005mg/l, 0.01mg/l, 0.05mg/l, 0.1mg/l, 0.5mg/l and 0.2mg/l. Signs of toxicity such as hyperactive symptoms, loss of balance, motionlessness and death were recorded. A varying degree of mortality (dose-dependent) was noticed during the test. On the contrary, no such toxicity signs and mortality occurred in the control, indicating that they were caused by the test substance. The 24h LC50 was 3.66mg/l, which is less than the recommended application dose (125mg/l). Products constituted of imidacloprid and lambda-cyhalothrin should therefore be handled with care and far from water bodies because of their potential to cause harm to non-target aquatic biota. |
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| format | Article |
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| issn | 2610-9182 |
| language | English |
| last_indexed | 2024-12-12T23:21:41Z |
| publishDate | 2017-09-01 |
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| series | Emerging Science Journal |
| spelling | doaj.art-39d36f4ca9a242af929ca1945e505b3a2022-12-22T00:08:16ZengItal PublicationEmerging Science Journal2610-91822017-09-0112495310.28991/ijse-011126Ecotoxicological Effects of Imidacloprid and Lambda-Cyhalothrin (Insecticide) on Tadpoles of the African Common Toad, Amietophrynus Regularis (Reuss, 1833) (Amphibia: Bufonidae)Daniel Brice Kenko Nkontcheu0Norbert Ngameni Tchamadeu1Francis Ngealekeleoh2Stella Nchase3Zoology Laboratory, Department of Zoology and Animal Physiology, University of Buea, Cameroon Laboratory for Biology and Applied Ecology, University of Dschang, CameroonLaboratory for Biology and Applied Ecology, University of Dschang, CameroonLaboratory for Biology and Applied Ecology, University of Dschang, CameroonZoology Laboratory, Department of Zoology and Animal Physiology, University of Buea, CameroonAgriculture is the main activity carried out in Cameroon and pesticide use is believed to be a common rule for its success. Most of the farms are situated close to water bodies, thus constituting a potential risk to non-target aquatic organisms. Declines of amphibian populations have been a worldwide issue of concern for the scientific community during the last several decades. The aim of this study was to assess the effects of an insecticide used by local farmers in Buea on amphibians. Parastar 40WP® which is constituted of imidacloprid + lambda-cyhalothrin a commonly used insecticide was applied on tadpoles of the African common toad Amietophrynus regularis (Reuss, 1833) in a static renewal experiment. The acute toxicity test was carried out after a range finding test from which seven test concentrations were selected. These concentrations were 0.0025mg/l, 0.005mg/l, 0.01mg/l, 0.05mg/l, 0.1mg/l, 0.5mg/l and 0.2mg/l. Signs of toxicity such as hyperactive symptoms, loss of balance, motionlessness and death were recorded. A varying degree of mortality (dose-dependent) was noticed during the test. On the contrary, no such toxicity signs and mortality occurred in the control, indicating that they were caused by the test substance. The 24h LC50 was 3.66mg/l, which is less than the recommended application dose (125mg/l). Products constituted of imidacloprid and lambda-cyhalothrin should therefore be handled with care and far from water bodies because of their potential to cause harm to non-target aquatic biota.https://ijournalse.org/index.php/ESJ/article/view/22AcuteAmphibiansInsecticideTadpolesDose-dependence. |
| spellingShingle | Daniel Brice Kenko Nkontcheu Norbert Ngameni Tchamadeu Francis Ngealekeleoh Stella Nchase Ecotoxicological Effects of Imidacloprid and Lambda-Cyhalothrin (Insecticide) on Tadpoles of the African Common Toad, Amietophrynus Regularis (Reuss, 1833) (Amphibia: Bufonidae) Emerging Science Journal Acute Amphibians Insecticide Tadpoles Dose-dependence. |
| title | Ecotoxicological Effects of Imidacloprid and Lambda-Cyhalothrin (Insecticide) on Tadpoles of the African Common Toad, Amietophrynus Regularis (Reuss, 1833) (Amphibia: Bufonidae) |
| title_full | Ecotoxicological Effects of Imidacloprid and Lambda-Cyhalothrin (Insecticide) on Tadpoles of the African Common Toad, Amietophrynus Regularis (Reuss, 1833) (Amphibia: Bufonidae) |
| title_fullStr | Ecotoxicological Effects of Imidacloprid and Lambda-Cyhalothrin (Insecticide) on Tadpoles of the African Common Toad, Amietophrynus Regularis (Reuss, 1833) (Amphibia: Bufonidae) |
| title_full_unstemmed | Ecotoxicological Effects of Imidacloprid and Lambda-Cyhalothrin (Insecticide) on Tadpoles of the African Common Toad, Amietophrynus Regularis (Reuss, 1833) (Amphibia: Bufonidae) |
| title_short | Ecotoxicological Effects of Imidacloprid and Lambda-Cyhalothrin (Insecticide) on Tadpoles of the African Common Toad, Amietophrynus Regularis (Reuss, 1833) (Amphibia: Bufonidae) |
| title_sort | ecotoxicological effects of imidacloprid and lambda cyhalothrin insecticide on tadpoles of the african common toad amietophrynus regularis reuss 1833 amphibia bufonidae |
| topic | Acute Amphibians Insecticide Tadpoles Dose-dependence. |
| url | https://ijournalse.org/index.php/ESJ/article/view/22 |
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