Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria
The present study investigated the ecological status of Opa reservoir, Obafemi Awolowo University, Ile Ife, Nigeria, based on the spatial and temporal variations in abundance and distribution of zooplankton. 72 samples were collected monthly with a quantitative net zooplankton from both the surface...
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| Format: | Article |
| Language: | English |
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Society of Land Measurements and Cadastre from Transylvania (SMTCT)
2018-06-01
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| Series: | Notulae Scientia Biologicae |
| Subjects: | |
| Online Access: | https://www.notulaebiologicae.ro/index.php/nsb/article/view/10170 |
| _version_ | 1818175840248135680 |
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| author | Oluseun Peter BOLAWA Adebukola Adenike ADEDEJI Yetunde Folasade TAIWO |
| author_facet | Oluseun Peter BOLAWA Adebukola Adenike ADEDEJI Yetunde Folasade TAIWO |
| author_sort | Oluseun Peter BOLAWA |
| collection | DOAJ |
| description | The present study investigated the ecological status of Opa reservoir, Obafemi Awolowo University, Ile Ife, Nigeria, based on the spatial and temporal variations in abundance and distribution of zooplankton. 72 samples were collected monthly with a quantitative net zooplankton from both the surface and bottom levels in three stations established at the dam site (Lacustrine), mid-lake (Transition) and inflow (Riverine) over a period of an annual cycle. A total of fifty-four (54) species were recorded from the reservoir comprising Rotifera (57.41%) > Arthropoda (33.33%) > Protozoa (5.56%) > Ciliophora (1.85%) = Cnidaria (1.85%), in the order of abundance. The least number of species (47) was recorded at the Transition station, while the highest number of species (49) occurred at the Lacustrine zone. Of all the zooplankton recorded, four species had significant spatial variation, while nine displayed seasonal variations during the study period (p ≤ 0.05). The highest species richness was observed in Transition surface station (4.18), followed by Lacustrine surface station (3.80) and Riverine surface station (3.23). Shannon’s index showed that zooplankton species were more diverse during the rainy season than dry season. The highest Trophic State Index (TSICR) with respect to Rotifer abundance occurred in Transition surface, followed by Riverine surface and the least occurred in Transition bottom portion. The mean TSICR value obtained was 65.20, indicative of hyper-eutrophic, while the mean TSICL value with respect to cyclopoida-calanoida obtained was 58.07 also revealing eutrophic status of the study area. Opa reservoir comprises mainly Rotifers and its TSICR showed the lake as eutrophic, tending towards becoming hyper-eutrophic, which could speed up the aging of the lake. |
| first_indexed | 2024-12-11T20:06:41Z |
| format | Article |
| id | doaj.art-38bb07e358014e91982446bf0ed8b618 |
| institution | Directory Open Access Journal |
| issn | 2067-3205 2067-3264 |
| language | English |
| last_indexed | 2024-12-11T20:06:41Z |
| publishDate | 2018-06-01 |
| publisher | Society of Land Measurements and Cadastre from Transylvania (SMTCT) |
| record_format | Article |
| series | Notulae Scientia Biologicae |
| spelling | doaj.art-38bb07e358014e91982446bf0ed8b6182022-12-22T00:52:23ZengSociety of Land Measurements and Cadastre from Transylvania (SMTCT)Notulae Scientia Biologicae2067-32052067-32642018-06-0110226527410.15835/nsb102101708387Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest NigeriaOluseun Peter BOLAWA0Adebukola Adenike ADEDEJI1Yetunde Folasade TAIWO2Obafemi Awolowo University, Department of Zoology, Ile-Ife1Obafemi Awolowo University, Department of Zoology, Ile-IfeObafemi Awolowo University, Natural History Museum, Ile-IfeThe present study investigated the ecological status of Opa reservoir, Obafemi Awolowo University, Ile Ife, Nigeria, based on the spatial and temporal variations in abundance and distribution of zooplankton. 72 samples were collected monthly with a quantitative net zooplankton from both the surface and bottom levels in three stations established at the dam site (Lacustrine), mid-lake (Transition) and inflow (Riverine) over a period of an annual cycle. A total of fifty-four (54) species were recorded from the reservoir comprising Rotifera (57.41%) > Arthropoda (33.33%) > Protozoa (5.56%) > Ciliophora (1.85%) = Cnidaria (1.85%), in the order of abundance. The least number of species (47) was recorded at the Transition station, while the highest number of species (49) occurred at the Lacustrine zone. Of all the zooplankton recorded, four species had significant spatial variation, while nine displayed seasonal variations during the study period (p ≤ 0.05). The highest species richness was observed in Transition surface station (4.18), followed by Lacustrine surface station (3.80) and Riverine surface station (3.23). Shannon’s index showed that zooplankton species were more diverse during the rainy season than dry season. The highest Trophic State Index (TSICR) with respect to Rotifer abundance occurred in Transition surface, followed by Riverine surface and the least occurred in Transition bottom portion. The mean TSICR value obtained was 65.20, indicative of hyper-eutrophic, while the mean TSICL value with respect to cyclopoida-calanoida obtained was 58.07 also revealing eutrophic status of the study area. Opa reservoir comprises mainly Rotifers and its TSICR showed the lake as eutrophic, tending towards becoming hyper-eutrophic, which could speed up the aging of the lake.https://www.notulaebiologicae.ro/index.php/nsb/article/view/10170Opa reservoir occurrencespatial variationspecies richnesstemporal variation zonestrophic state index |
| spellingShingle | Oluseun Peter BOLAWA Adebukola Adenike ADEDEJI Yetunde Folasade TAIWO Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria Notulae Scientia Biologicae Opa reservoir occurrence spatial variation species richness temporal variation zones trophic state index |
| title | Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria |
| title_full | Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria |
| title_fullStr | Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria |
| title_full_unstemmed | Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria |
| title_short | Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria |
| title_sort | temporal and spatial variations in abundance and diversity of zooplankton fauna of opa reservoir obafemi awolowo university ile ife southwest nigeria |
| topic | Opa reservoir occurrence spatial variation species richness temporal variation zones trophic state index |
| url | https://www.notulaebiologicae.ro/index.php/nsb/article/view/10170 |
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