Effect of Size on the Acute Toxicity of Crude Oil to the Mangrove Oyster, Carasostrea gasar
The acute toxic effects of a Nigerian crude oil (Egbogoro Liner II) to the mangrove oyster Carasostrea gasar were studied in bioassays. Tests were conducted over a 96-hr period after acclimatization of individuals in the laboratory, initially with a population comprising a broad size categories (11...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Joint Coordination Centre of the World Bank assisted National Agricultural Research Programme (NARP)
2005-09-01
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| Series: | Journal of Applied Sciences and Environmental Management |
| Online Access: | https://www.ajol.info/index.php/jasem/article/view/17234 |
| _version_ | 1797227853997146112 |
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| author | E R Daka I K E Ekweozor |
| author_facet | E R Daka I K E Ekweozor |
| author_sort | E R Daka |
| collection | DOAJ |
| description | The acute toxic effects of a Nigerian crude oil (Egbogoro Liner II) to the mangrove oyster Carasostrea gasar were studied in bioassays. Tests were conducted over a 96-hr period after acclimatization of individuals in the laboratory, initially with a population comprising a broad size categories (11 - 60 mm) in range finding tests. The tests were semi-static bioassays in which the exposure media were replaced every 24 hours, at which the oysters were also examined for mortality. Subsequent experimentation was designed to compare the toxicities of oil to small (10 - 30 mm) and large (41 - 60 mm) oysters. LC50 values were obtained by graphical interpolation. Significant differences in effects at each time interval between small and large oysters were determined using the Man-Whitney tests on percentage mortality values. Relative toxicity tests showed consistently lower mortalities for small oysters at 24-hr, 48-hr and 96-hr periods, with Mann-Withney tests showing significant differences (p |
| first_indexed | 2024-04-24T14:47:25Z |
| format | Article |
| id | doaj.art-bc918c112cee41baac75d34d4a83a1d6 |
| institution | Directory Open Access Journal |
| issn | 2659-1502 2659-1499 |
| language | English |
| last_indexed | 2024-04-24T14:47:25Z |
| publishDate | 2005-09-01 |
| publisher | Joint Coordination Centre of the World Bank assisted National Agricultural Research Programme (NARP) |
| record_format | Article |
| series | Journal of Applied Sciences and Environmental Management |
| spelling | doaj.art-bc918c112cee41baac75d34d4a83a1d62024-04-02T19:54:57ZengJoint Coordination Centre of the World Bank assisted National Agricultural Research Programme (NARP)Journal of Applied Sciences and Environmental Management2659-15022659-14992005-09-018210.4314/jasem.v8i2.17234Effect of Size on the Acute Toxicity of Crude Oil to the Mangrove Oyster, Carasostrea gasarE R DakaI K E EkweozorThe acute toxic effects of a Nigerian crude oil (Egbogoro Liner II) to the mangrove oyster Carasostrea gasar were studied in bioassays. Tests were conducted over a 96-hr period after acclimatization of individuals in the laboratory, initially with a population comprising a broad size categories (11 - 60 mm) in range finding tests. The tests were semi-static bioassays in which the exposure media were replaced every 24 hours, at which the oysters were also examined for mortality. Subsequent experimentation was designed to compare the toxicities of oil to small (10 - 30 mm) and large (41 - 60 mm) oysters. LC50 values were obtained by graphical interpolation. Significant differences in effects at each time interval between small and large oysters were determined using the Man-Whitney tests on percentage mortality values. Relative toxicity tests showed consistently lower mortalities for small oysters at 24-hr, 48-hr and 96-hr periods, with Mann-Withney tests showing significant differences (phttps://www.ajol.info/index.php/jasem/article/view/17234 |
| spellingShingle | E R Daka I K E Ekweozor Effect of Size on the Acute Toxicity of Crude Oil to the Mangrove Oyster, Carasostrea gasar Journal of Applied Sciences and Environmental Management |
| title | Effect of Size on the Acute Toxicity of Crude Oil to the Mangrove Oyster, Carasostrea gasar |
| title_full | Effect of Size on the Acute Toxicity of Crude Oil to the Mangrove Oyster, Carasostrea gasar |
| title_fullStr | Effect of Size on the Acute Toxicity of Crude Oil to the Mangrove Oyster, Carasostrea gasar |
| title_full_unstemmed | Effect of Size on the Acute Toxicity of Crude Oil to the Mangrove Oyster, Carasostrea gasar |
| title_short | Effect of Size on the Acute Toxicity of Crude Oil to the Mangrove Oyster, Carasostrea gasar |
| title_sort | effect of size on the acute toxicity of crude oil to the mangrove oyster carasostrea gasar |
| url | https://www.ajol.info/index.php/jasem/article/view/17234 |
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