Spatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western Uganda
Abstract The study was conducted to assess the spatial and temporal variations of the trophic state condition of Lake Bunyonyi between October 2019 and September 2020. Secchi depth (SD), total phosphorus (TP) and chlorophyll-a (Chl-a) concentration were measured to aid the quantification of trophic...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-11-01
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| Series: | Applied Water Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s13201-022-01816-y |
| _version_ | 1828184381715382272 |
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| author | Alex Saturday Thomas J. Lyimo John Machiwa Siajali Pamba |
| author_facet | Alex Saturday Thomas J. Lyimo John Machiwa Siajali Pamba |
| author_sort | Alex Saturday |
| collection | DOAJ |
| description | Abstract The study was conducted to assess the spatial and temporal variations of the trophic state condition of Lake Bunyonyi between October 2019 and September 2020. Secchi depth (SD), total phosphorus (TP) and chlorophyll-a (Chl-a) concentration were measured to aid the quantification of trophic state condition of the lake using Carlson trophic state index (CTSI). The trophic state index (TSI) values based on SD, TP and Chl-a values were 60.82 ± 5.35, 68.99 ± 11.04 and 61.74 ± 7.51, respectively. March 2020 recorded the highest mean CSTI value (70.14 ± 4.04), while in September 2020, the lowest mean value (58.03 ± 6.22) was obtained. Based on CTSI values, the lake was eutrophic in both dry and wet seasons albeit with differences in the values. The eutrophic state of the lake is possibly attributed to nutrients inflow into the lake via runoff and drainage from farmlands. The negative value of TSI-Chl-a–TSI-TP deviation pointed out that the lake is not phosphorus limited, while the positive TSI-Chl-a–TSI-SD mean deviation value revealed the effect of Chl-a and TP on the lake’s transparency. The study recommends the necessity to develop guidelines for the trophic status monitoring of Lake Bunyonyi since results suggest the deteriorating lake condition. |
| first_indexed | 2024-04-12T06:49:09Z |
| format | Article |
| id | doaj.art-7577fe457b614440a781cebdab3e01e7 |
| institution | Directory Open Access Journal |
| issn | 2190-5487 2190-5495 |
| language | English |
| last_indexed | 2024-04-12T06:49:09Z |
| publishDate | 2022-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Applied Water Science |
| spelling | doaj.art-7577fe457b614440a781cebdab3e01e72022-12-22T03:43:26ZengSpringerOpenApplied Water Science2190-54872190-54952022-11-0113111110.1007/s13201-022-01816-ySpatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western UgandaAlex Saturday0Thomas J. Lyimo1John Machiwa2Siajali Pamba3Department of Environmental Sciences, Kabale UniversityDepartment of Environmental Sciences, Kabale UniversityDepartment of Molecular Biology and Biotechnology, University of Dar es SalaamDepartment of Molecular Biology and Biotechnology, University of Dar es SalaamAbstract The study was conducted to assess the spatial and temporal variations of the trophic state condition of Lake Bunyonyi between October 2019 and September 2020. Secchi depth (SD), total phosphorus (TP) and chlorophyll-a (Chl-a) concentration were measured to aid the quantification of trophic state condition of the lake using Carlson trophic state index (CTSI). The trophic state index (TSI) values based on SD, TP and Chl-a values were 60.82 ± 5.35, 68.99 ± 11.04 and 61.74 ± 7.51, respectively. March 2020 recorded the highest mean CSTI value (70.14 ± 4.04), while in September 2020, the lowest mean value (58.03 ± 6.22) was obtained. Based on CTSI values, the lake was eutrophic in both dry and wet seasons albeit with differences in the values. The eutrophic state of the lake is possibly attributed to nutrients inflow into the lake via runoff and drainage from farmlands. The negative value of TSI-Chl-a–TSI-TP deviation pointed out that the lake is not phosphorus limited, while the positive TSI-Chl-a–TSI-SD mean deviation value revealed the effect of Chl-a and TP on the lake’s transparency. The study recommends the necessity to develop guidelines for the trophic status monitoring of Lake Bunyonyi since results suggest the deteriorating lake condition.https://doi.org/10.1007/s13201-022-01816-yWater qualityTrophic state indexSecchi depth transparencyLake Bunyonyi |
| spellingShingle | Alex Saturday Thomas J. Lyimo John Machiwa Siajali Pamba Spatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western Uganda Applied Water Science Water quality Trophic state index Secchi depth transparency Lake Bunyonyi |
| title | Spatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western Uganda |
| title_full | Spatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western Uganda |
| title_fullStr | Spatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western Uganda |
| title_full_unstemmed | Spatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western Uganda |
| title_short | Spatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western Uganda |
| title_sort | spatial and temporal variations of trophic state conditions of lake bunyonyi south western uganda |
| topic | Water quality Trophic state index Secchi depth transparency Lake Bunyonyi |
| url | https://doi.org/10.1007/s13201-022-01816-y |
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