Browsing Research Articles [MEWES] by Author "Semba, Masumbuko"
Now showing items 1-16 of 16
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Caudal fin as a proxy for dorsal muscle for nutrient enrichment monitoring using stable isotope analysis: the case of Gerres filamentosus and G. oyena from mangrove creeks of Tanzania
Lugendo, Blandina; Igulu, Mathias; Semba, Masumbuko; Kimirei, Ismael (Western Indian Ocean Journal of Marine Science, 2022)The use of fish dorsal muscles in stable isotope studies, which is an invasive method that results in fish deaths, limits their applicability for rare and endangered fish species, as well as when large sample sizes and ... -
Co-management of Lake Victoria Fisheries
Mahatane, A.; Mgaya, Yunus D.; Hoza, R. B.; Onyango, P. O.; Semba, Masumbuko (Springer Nature Switzerland AG., 2017-11-29)There have been concerns about the declining fish catches and fisheries ecosystem health for a number of fisheries including Lake Victoria. Consequently, a co-management system has been introduced as a means of, among ... -
Coastal upwelling and seasonal variation in phytoplankton biomass in the Pemba Channel
Kyewalyanga, Margareth S.; Peter, Nyamisi; Semba, Masumbuko; Mahongo, Shigalla B. (African Journals Online, 2021-02-11)This study was conducted in the Pemba Channel off Tanga Region in northern Tanzania to investigate physical and chemical factors that drive changes in phytoplankton biomass. Three transects off Mwaboza, Vyeru and Sahare ... -
The decline in phytoplankton biomass and prawn catches in the Rufiji-Mafia Channel, Tanzania
Semba, Masumbuko; Kimirei, Ismael; Kyewalyanga, Margareth; Peter, Nyamisi; Brendonck, Luc; Somers, Ben (African Journals Online, 2016-11-27)The world’s oceans have seen significant declines in phytoplankton-the primary food source in the marine environment. This decline in primary producers is likely to impact the food chain and functions of most coastal and ... -
Ecological Changes in the Zambezi River Basin
Semba, Masumbuko; Murisa, Mzime; Mubaya, Chipo; Kimirei, Ismael; Chavula, Geoffrey; Mwedzi, Tongayi; Maravanyika, Tendayi; Zenda, Sandra (African Books Collective, 2021-11)Africa faces a plethora of challenges and chief among these is a change in the climate (Zakaria and Maharjan 2014) which is one of the key factors affecting the ecology and hydrology of its river basins (Kusangaya et al. ... -
Environmental Changes in the Tanzanian Part of Lake Victoria
Kimirei, I. A.; Semba, Masumbuko; Mwakosya, C.; Mgaya, Yunus D.; Mahongo, Shigalla B. (Springer Nature Switzerland AG., 2017-11-29)Lake Victoria is known for its explosive speciation and recent time hybridization, which is highly mediated by deterioration of water quality. This chapter summarizes the knowledge on change of water quality and environment ... -
Fisheries Statistics for Lake Victoria, Tanzania
Sobo, F.; Mgaya, Yunus D.; Kayanda, R. J.; Semba, Masumbuko (Springer Nature Switzerland AG., 2017-11-29)Time series fisheries statistics data mainly from Frame Surveys, Catch Assessment Surveys and Fisheries Annual Statistics Reports for Lake Victoria from 1967–2016 were collected from the Fisheries Development Division in ... -
Growth, mortality, exploitation rate and recruitment pattern of Octopus cyanea (Mollusca: Cephalopoda) in the WIO region: A case study from the Mafia Archipelago, Tanzania
Silas, Mathew; Kishe, Mary; Mshana, Johnson; Semba, Masumbuko; Mgeleka, Said; Kuboja, Bigeyo; Ngatunga, Benjamin; Chande, Muhaji; Matiku, Patroba (Western Indian Ocean Journal of Marine Science, 2021-08-24)Octopus cyanea is a commercially important cephalopod in the Western Indian Ocean (WIO) region, but scientific information to inform management strategies for the species is limited. A study was conducted in 2014, 2015, ... -
High-frequency dynamics of pH, dissolved oxygen, and temperature in the coastal ecosystems of the Tanga- Pemba Seascape: implications for upwelling-enhanced ocean acidification and deoxygenation
Job, Samson; Semba, Masumbuko; Monga, Elinasi; Lugendo, Blandina; Tuda, Arthur; Kimirei, Ismael; Rushingisha, George (Frontiers, 2024-01-08)Ocean acidification, deoxygenation, and warming are three interconnected global change challenges caused by increased anthropogenic carbon emissions. These issues present substantial threats to marine organisms, ecosystems, ... -
The influence of physical-chemical variables on the spatial and seasonal variation of Chlorophyll-a in coastal waters of Unguja, Zanzibar, Tanzania
Peter, Nyamisi; Semba, Masumbuko; Lugomela, Charles; Kyewalyanga, Margareth S. (African Journals Online, 2018-12-11)Chlorophyll-a (Chl-a) concentrations were measured at four sites around Unguja, Zanzibar during the northeast (NE) and southeast (SE) monsoon seasons. Data for Chl-a, nitrate, phosphate, ammonia, dissolved ... -
Seasonal and spatial variation of surface current in the Pemba Channel, Tanzania
Semba, Masumbuko; Lumpkin, Rick; Kimirei, Ismael; Shaghude, Yohanna; Nyandwi, Ntahondi (PLOS ONE, 2019-01-07)The surface current speeds within the Pemba channel were examined using 24 years of drifter data received from the Global Drifter Program. This study aimed to uncover varying surface current in the Pemba Channel in different ... -
Seasonal variability of vertical patterns in chlorophyll-a fluorescence in the coastal waters off Kimbiji, Tanzania
Peter, Nyamisi; Semba, Masumbuko; Lugomela, Charles; Kyewalyanga, Margareth (Western Indian Ocean Journal of Marine Science, 2021-09-24)A study on the vertical pattern of chlorophyll-a (Chl-a) fluorescence was undertaken in the Mafia Channel off Kimbiji, Tanzania. Data was collected during the Southeast Monsoon (SEM) and Northeast Monsoon (NEM) seasons. ... -
Small Estuarine and Non-Estuarine Mangrove Ecosystems of Tanzania: Overlooked Coastal Habitats?
Kimirei, I. A.; Igulu, M. M.; Semba, Masumbuko; Lugendo, B. R. (Springer Nature Switzerland AG., 2016-03-23)Small estuaries and non-estuarine habitats harboring mangroves are very important ecosystems which provide important ecosystem goods and services; such as provision of ecological niches for juvenile fishes and invertebrates, ... -
Small Estuarine and Non-Estuarine Mangrove Ecosystems of Tanzania: Overlooked Coastal Habitats?
Kimirei, A; Igulu, Mathias; Semba, Masumbuko; Lugendo, Blandina (Springer International Publishing, 2016-03-23)Small estuaries and non-estuarine habitats harboring mangroves are very important ecosystems which provide important ecosystem goods and services; such as provision of ecological niches for juvenile fishes and invertebrates, ... -
Small Scale Fisheries Management: Lessons from Cockle Harvesters in Nicaragua and Tanzania
Crawford, Brian; Herrera, Maria D.; Herrera, Herrera; Leclair, Carlos Rivas; Jiddawi, Narriman; Semba, Masumbuko; Haws, Maria (Taylor & Francis Online, 2010-06-01)The role of women in gleaning fisheries tends to be underestimated and poorly documented although they play an important role in coastal food security and income generation. This article describes two initiatives for ... -
Using fishers’ local ecological knowledge for management of small-scale fisheries in data-poor regions: Comparing seasonal interview and field observation records in East Africa
Silas, Mathew; Semba, Masumbuko; Mgeleka, Said; Well, Lisa; Linderholm, Hans; Gullström, Martin (Elsevier, 2023-08)Fishers, scientists and policy makers need to describe, understand and “agree on” variations in fish catches caused by exploitation and climate change for effective fisheries management. To achieve this, relevant data with ...