Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, Nigeria
This study was carried out from December 2018 to November 2019 to examine the distribution and abundance of harmful algal species (HAS) in the central Bonny estuary. Seven sampling stations were established with ArcGIS tool. Microalgae species were sampled with 20 mm mesh plankton net. Nutrients we...
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| Format: | Article |
| Language: | English |
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Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)
2022-08-01
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| Series: | Marine and Fishery Sciences |
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| Online Access: | https://ojs.inidep.edu.ar/index.php/mafis/article/view/237 |
| _version_ | 1818015789056262144 |
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| author | Henry Dienye Francis D. Sikoki Geoffrey N. Woke Olaniyi A. Olopade |
| author_facet | Henry Dienye Francis D. Sikoki Geoffrey N. Woke Olaniyi A. Olopade |
| author_sort | Henry Dienye |
| collection | DOAJ |
| description |
This study was carried out from December 2018 to November 2019 to examine the distribution and abundance of harmful algal species (HAS) in the central Bonny estuary. Seven sampling stations were established with ArcGIS tool. Microalgae species were sampled with 20 mm mesh plankton net. Nutrients were analyzed in the laboratory using the APHA 4500 Method, while physicochemical characteristics were determined in situ. Results revealed that environmental gradients were adequate to support life in that part of the estuary except for phosphate (2.90 ± 0.22-9.48 ± 1.06 mg l-1). A total of 31 HASs categorized into 17 genera and three classes were determined: Bacillariophyceae (29 species), Chlorophyceae and Cyanophyceae (one species each). Navicula amphibola had the highest density (4.713 103 cells l-1) while Pinnularia divergens recorded the lowest density (0.00049 103 cells l-1). Total density values decreased across seasons with 9.157 103 cells l-1 in dry season and 8.907 103 cells l-1 in wet season. Checklist of species across stations showed that five species were distributed across the seven stations, while two were found only in Station 2 and 7. Diversity indices revealed Shannon’s index ranged between 3.17 and 3.25 and species evenness ranged between 0.78 and 0.88, while Margalef range value (3.09-3.31) was considered moderately stable. Therefore, there is a need for proper management practices which could help to reduce the level of nutrient discharge into the central Bonny estuary.
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| first_indexed | 2024-04-14T07:03:16Z |
| format | Article |
| id | doaj.art-200bd8f202724e28847d4d175c15ab85 |
| institution | Directory Open Access Journal |
| issn | 2683-7951 |
| language | English |
| last_indexed | 2024-04-14T07:03:16Z |
| publishDate | 2022-08-01 |
| publisher | Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) |
| record_format | Article |
| series | Marine and Fishery Sciences |
| spelling | doaj.art-200bd8f202724e28847d4d175c15ab852022-12-22T02:06:40ZengInstituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)Marine and Fishery Sciences2683-79512022-08-0135310.47193/mafis.3532022010908Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, NigeriaHenry Dienye0Francis D. Sikoki1Geoffrey N. Woke2Olaniyi A. Olopade3Department of Fisheries, Faculty of Agriculture, University of Port Harcourt, East/West Road, PMB 5323 - Choba, NigeriaDepartment of Animal and Environmental Biology, University of Port Harcourt East/West Road, PMB 5323 - Choba, NigeriaDepartment of Animal and Environmental Biology, University of Port Harcourt East/West Road, PMB 5323 - Choba, NigeriaDepartment of Fisheries, Faculty of Agriculture, University of Port Harcourt, East/West Road, PMB 5323 - Choba, Nigeria This study was carried out from December 2018 to November 2019 to examine the distribution and abundance of harmful algal species (HAS) in the central Bonny estuary. Seven sampling stations were established with ArcGIS tool. Microalgae species were sampled with 20 mm mesh plankton net. Nutrients were analyzed in the laboratory using the APHA 4500 Method, while physicochemical characteristics were determined in situ. Results revealed that environmental gradients were adequate to support life in that part of the estuary except for phosphate (2.90 ± 0.22-9.48 ± 1.06 mg l-1). A total of 31 HASs categorized into 17 genera and three classes were determined: Bacillariophyceae (29 species), Chlorophyceae and Cyanophyceae (one species each). Navicula amphibola had the highest density (4.713 103 cells l-1) while Pinnularia divergens recorded the lowest density (0.00049 103 cells l-1). Total density values decreased across seasons with 9.157 103 cells l-1 in dry season and 8.907 103 cells l-1 in wet season. Checklist of species across stations showed that five species were distributed across the seven stations, while two were found only in Station 2 and 7. Diversity indices revealed Shannon’s index ranged between 3.17 and 3.25 and species evenness ranged between 0.78 and 0.88, while Margalef range value (3.09-3.31) was considered moderately stable. Therefore, there is a need for proper management practices which could help to reduce the level of nutrient discharge into the central Bonny estuary. https://ojs.inidep.edu.ar/index.php/mafis/article/view/237DistributionseasonabundanceHASenvironmental gradients |
| spellingShingle | Henry Dienye Francis D. Sikoki Geoffrey N. Woke Olaniyi A. Olopade Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, Nigeria Marine and Fishery Sciences Distribution season abundance HAS environmental gradients |
| title | Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, Nigeria |
| title_full | Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, Nigeria |
| title_fullStr | Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, Nigeria |
| title_full_unstemmed | Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, Nigeria |
| title_short | Diversity of bloom forming harmful algal species in the central Bonny Estuary, Niger delta, Nigeria |
| title_sort | diversity of bloom forming harmful algal species in the central bonny estuary niger delta nigeria |
| topic | Distribution season abundance HAS environmental gradients |
| url | https://ojs.inidep.edu.ar/index.php/mafis/article/view/237 |
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