GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Application of machine learning algorithms and Sentinel-2 satellite for improved bathymetry retrieval in Lake Victoria, Tanzania
    Elsevier BV ; 2023
    In:  The Egyptian Journal of Remote Sensing and Space Science Vol. 26, No. 3 ( 2023-12), p. 619-627
    Details
    In: The Egyptian Journal of Remote Sensing and Space Science, Elsevier BV, Vol. 26, No. 3 ( 2023-12), p. 619-627
    Type of Medium: Online Resource
    ISSN: 1110-9823
    URL: Article
    DOI: 10.1016/j.ejrs.2023.07.003
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 2583596-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Spatial and temporal variations of phytoplankton composition and biomass in Lake Bunyonyi, South-Western Uganda
    Springer Science and Business Media LLC ; 2022
    In:  Environmental Monitoring and Assessment Vol. 194, No. 4 ( 2022-04)
    Details
    In: Environmental Monitoring and Assessment, Springer Science and Business Media LLC, Vol. 194, No. 4 ( 2022-04)
    Type of Medium: Online Resource
    ISSN: 0167-6369 , 1573-2959
    URL: Article
    DOI: 10.1007/s10661-022-09954-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2012242-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Modelling nitrogen transformation in the Lake Bunyonyi ecosystem, South-Western Uganda
    Springer Science and Business Media LLC ; 2022
    In:  Applied Water Science Vol. 12, No. 8 ( 2022-08)
    Details
    In: Applied Water Science, Springer Science and Business Media LLC, Vol. 12, No. 8 ( 2022-08)
    Abstract: Lake Bunyonyi is one of the major resources of social-economic potential in the districts of Rubanda and Kabale, South-Western Uganda. The lake’s sub-catchment faces environmental problems because of intensive agriculture, settlement, business and tourism activities, which consequently cause pollution of water in the lake’s system. This study, therefore, intended to determine the processes that govern nitrogen dynamism using a numerical model that takes into account various processes in the system using STELLA® 8.1.1 software. From the model simulation, it was found that mineralization, microbial uptake and nitrification were the major processes governing nitrogen transformation in the water phase, accounting for 47.8% (0.49 g/d m −2 ), 44.2% (0.45 g/d m −2 ), and 7.8% (0.05 g/d m −2 ), respectively. The developed model predicted reasonably well the behaviour of the lake evidenced by the validation results of observed and simulated data that showed good linear regression coefficients ( R 2 ) of organic nitrogen (0.48), ammonia–nitrogen (0.68), and nitrate–nitrogen (0.61). The model has proven suitable for application on lakes with characteristics similar to that of Lake Bunyonyi. The study recommended that a compressive investigation that puts into consideration all the possible sources of nutrient and water inflow into the lake system be done on Lake Bunyonyi.
    Type of Medium: Online Resource
    ISSN: 2190-5487 , 2190-5495
    URL: Article
    DOI: 10.1007/s13201-022-01709-0
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2594789-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Spatial and temporal variations of faecal indicator bacteria in Lake Bunyonyi, South-Western Uganda
    Springer Science and Business Media LLC ; 2021
    In:  SN Applied Sciences Vol. 3, No. 7 ( 2021-07)
    Details
    In: SN Applied Sciences, Springer Science and Business Media LLC, Vol. 3, No. 7 ( 2021-07)
    Abstract: Background Microbial water quality serves to indicate health risks associated with the consumption of contaminated water. Nevertheless, little is known about the microbiological characteristics of water in Lake Bunyonyi. This study was therefore undertaken to examine the spatial and temporal variations of faecal indicator bacteria (FIB) in relation to physicochemical parameters in Lake Bunyonyi. Result The FIB concentration was consistently measured during sampling months and correlated with each other showing the presumed human faecal pollution in the lake. The highest concentration values for E. coli (64.7 ± 47.3 CFU/100 mL) and enterococci (24.6 ± 32.4 CFU/100 mL were obtained in the station close to the Mugyera trading centre. On a temporal basis, the maximum values were recorded during the rainy season in October 2019 (70.7 ± 56.5 CFU/100 mL for E. coli and 38.44 ± 31.8 CFU/100 mL for enterococci. FIB did not differ significantly among the study stations ( p   〉  0.05) but showed significant temporal variations among the months ( p   〈  0.05) with concentrations being significantly high in wet season than dry season ( U  = 794, p   〈  0.0001 for E. coli ; U  = 993.5, p  = 0.008 for enterococci). Spearman’s rank correlation revealed that FIB concentrations were significantly positively correlated with turbidity and DO concentration levels ( p   〈  0.05). Approximately 97.2% of the water samples had E. coli and enterococci concentrations levels below USEPA threshold for recreational waters. Likewise, 98.1 and 90.7% of samples recorded E. coli and enterococci counts exceeding the UNBS, APHA, WHO and EU threshold values for drinking water. Conclusion The FIB counts show that the Lake Bunyonyi water is bacteriologically unsuitable for drinking unless it is treated since the FIB pose health risks to consumers. Besides, the water can be used for recreational purposes.
    Type of Medium: Online Resource
    ISSN: 2523-3963 , 2523-3971
    URL: Article
    DOI: 10.1007/s42452-021-04684-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2947292-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Use of GIS‐based multicriteria evaluation for improved selection of suitable sites for cage fish farming in Mwanza Gulf, Lake Victoria
    Wiley ; 2023
    In:  Aquaculture, Fish and Fisheries
    Details
    In: Aquaculture, Fish and Fisheries, Wiley
    Abstract: Stagnating capture fisheries and increasing fish protein demand necessitate aquaculture production to bridge the gap. Lake Victoria is a potential water body for increasing fish production through cage farming. The sustainability of Lake Victoria for cage farming depends on timely and holistic site selection. However, current site selection methods involve complex, resource‐intensive field surveys that lack a holistic approach to integrate multiple factors. Accordingly, information regarding suitable sites for sustainable fish cage farming in Lake Victoria remains scarce. In this study, a transparent geographic information systems (GIS) and multicriteria evaluation (MCE) here after reffered to as GIS‐MCE was used to reveal potential sites to be permitted or avoided during cage aquaculture development in the Mwanza Gulf of Lake Victoria (Tanzania). Our analysis involved weighting and integration of sub‐models representing ecologically sensitive areas, physical environment, and socio‐economic and water quality variables into a single spatial model portraying different site suitability levels in the Mwanza Gulf. The results indicated that the sub‐models identified relatively larger suitable and most suitable sites compared to the overall model. No site maintained its status across all sub‐models. The overall model designated a small area (5.10 km 2 or 1.52%) as the most suitable site, with 24.20 km 2 (7.44%) as suitable, 64.47 km 2 (19.82%) as less suitable, and 42.63 km 2 (13.12%) as unsuitable for cage fish farming. The remaining area (188.84 km 2 or 58.06%) was a constrained site to be avoided during cage aquaculture development. Taken together, the individual sub‐models are ineffective in designating potential sites for fish cage culture and thus should not be used solely. The GIS‐MCE general model provides a fast and timely method for identifying potential sites for cage farming in Lake Victoria. Fish farmers and managers should use the GIS‐MCE overall model in inland waters to facilitate site selection for complying with licensing requirements and decrease field extensive surveys.
    Type of Medium: Online Resource
    ISSN: 2693-8847 , 2693-8847
    URL: Article
    DOI: 10.1002/aff2.138
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 3119348-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Isolation and characterization of human pathogenic multidrug resistant bacteria associated with plastic litter collected in Zanzibar
    Elsevier BV ; 2021
    In:  Journal of Hazardous Materials Vol. 405 ( 2021-03), p. 124591-
    Details
    In: Journal of Hazardous Materials, Elsevier BV, Vol. 405 ( 2021-03), p. 124591-
    Type of Medium: Online Resource
    ISSN: 0304-3894
    URL: Article
    DOI: 10.1016/j.jhazmat.2020.124591
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 1491302-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Spatial and temporal variations of trophic state conditions of Lake Bunyonyi, south-western Uganda
    Springer Science and Business Media LLC ; 2023
    In:  Applied Water Science Vol. 13, No. 1 ( 2023-01)
    Details
    In: Applied Water Science, Springer Science and Business Media LLC, Vol. 13, No. 1 ( 2023-01)
    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.
    Type of Medium: Online Resource
    ISSN: 2190-5487 , 2190-5495
    URL: Article
    DOI: 10.1007/s13201-022-01816-y
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2594789-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Seagrass restoration in a high-energy environment in the Western Indian Ocean
    Elsevier BV ; 2022
    In:  Estuarine, Coastal and Shelf Science Vol. 278 ( 2022-11), p. 108119-
    Details
    In: Estuarine, Coastal and Shelf Science, Elsevier BV, Vol. 278 ( 2022-11), p. 108119-
    Type of Medium: Online Resource
    ISSN: 0272-7714
    URL: Article
    DOI: 10.1016/j.ecss.2022.108119
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 1466742-3
    detail.hit.zdb_id: 763369-5
    SSG: 21,3
    SSG: 12
    SSG: 14
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Spatio-temporal variations in physicochemical water quality parameters of Lake Bunyonyi, Southwestern Uganda
    Springer Science and Business Media LLC ; 2021
    In:  SN Applied Sciences Vol. 3, No. 7 ( 2021-07)
    Details
    In: SN Applied Sciences, Springer Science and Business Media LLC, Vol. 3, No. 7 ( 2021-07)
    Abstract: The current study was carried out to examine the spatial and temporal variations of physicochemical water quality parameters of Lake Bunyonyi. The observations were made on the surface water of Lake Bunyonyi for 1 year to determine the water quality. The basic 12 variables used to determine the quality of water were measured monthly at nine stations. Water temperature, dissolved oxygen (DO), turbidity, electric conductivity (EC), pH and Secchi depth (SD) were measured in the field, while parameters like total nitrogen (TN), total phosphorus (TP), nitrite-nitrogen (NO 2 -N), nitrate-nitrogen (NO 3 -N), soluble reactive phosphorus (SRP) were determined following APHA 2017 standard guidelines for physicochemical analysis. Taking into account standard guidelines for drinking water by the Uganda National Bureau of Standards (UNBS) and the World Health Organization (WHO), the water quality index (WQI) was used to determine the water quality. Temperature, DO, pH, turbidity and EC did not differ significantly among the study stations ( p   〉  0.05) but showed significant temporal variations among the study months ( p   〈  0.05). Likewise, TN, TP, NO 2 -N, NO 3 -N and SRP did not differ significantly among the study stations ( p   〉  0.05) but showed significant temporal variations among the study months ( p   〈  0.05). The WQI values ranged from 28.36 to 49 across and from 28.2 to 56.2 between study months with an overall mean value of 36.9. The measured water quality variables did not exceed the UNBS and WHO standards for drinking water in all months and at all stations. According to these values, the water quality of Lake Bunyonyi generally belongs to the ‘good’ class in terms of drinking water quality based on the WQI classification. The study findings are fundamentally important for policy makers in setting guidelines for effective lake management.
    Type of Medium: Online Resource
    ISSN: 2523-3963 , 2523-3971
    URL: Article
    DOI: 10.1007/s42452-021-04672-8
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2947292-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...