Ecological classification of estuaries along the Tanzanian mainland: a tool for conservation and management

Kaaya, Lulu T.

doi:10.4314/wiojms.v18i1.6

Cited by 3 publications

(2 citation statements)

References 17 publications

(19 reference statements)

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“…The Rufiji River in Tanzania forms the largest estuarine system along the western Indian Ocean, covering about 100 000 km 2 (Kaaya 2019). However, this system has received limited attention in past decades despite the fact that environmental investigations have indicated various problems associated with urban development in the upper catchment of the river.…”

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confidence: 99%

Spatial variation of nutrients and primary productivity in the Rufiji Delta mangroves, Tanzania

Minu

Routh

Machiwa

et al. 2020

African Journal of Marine Science

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Determinations of spatial and temporal variations in organic matter and nutrient dynamics in water and sediments are crucial for understanding changes in aquatic bodies. In this study, we (i) determine the spatial dynamics of dissolved inorganic nutrients, during the transition from the dry to the rainy season, and (ii) provide future productivity predictions for the Rufiji Delta mangroves, Tanzania, based on the input of various nutrients. Water samples were collected from six locations, three times per year between April 2012 and January 2014, and analysed for dissolved nutrients, total organic and inorganic carbon, chlorophyll a, chlorophyll b and total carotenoids. The prediction of future net primary productivity in the Rufiji mangroves was undertaken using the software STELLA. The mean nutrient concentrations were of the order: nitrate > phosphate > ammonium > silica > dissolved organic carbon. The study revealed that high nutrient concentrations occurred in the northern part of the Rufiji Delta as a result of anthropogenic influence in the watershed. Modelling of nutrient inputs into the delta indicated enhanced primary productivity, which is expected to increase the vulnerability of water quality in the near future due to eutrophication.

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confidence: 99%

Spatial variation of nutrients and primary productivity in the Rufiji Delta mangroves, Tanzania

Minu

Routh

Machiwa

et al. 2020

African Journal of Marine Science

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“…• Multi-or transdisciplinary approaches, without an upfront expectation that all aspects will be resolved -rather that key information gaps will emerge References : Alphayo and Sharma, 2018;Beilfuss and dos Santos, 2001;Bouilon et al, 2007;Coastal.climatecentral.org;Dalrymple and Choi, 2007;Furaca et al, 2021;Groeneveld et al, 2021aGroeneveld et al, , 2021bHoguane et al, 2021;Kaaya, 2019;Kitheka and Mavuti, 2016;Moore et al, 2007 References: Agergaard and Ortenbjerg, 2017;Agergaard et al, 2019;Bouillon et al, 2007;Blythe, 2014;Blythe et al, 2014;Brown, 1971;Duvail et al, 2017;Francisco et al, 2021;Furaca et al, 2021;Groeneveld et al, 2021aGroeneveld et al, , 2021bHannerz, 2015;Hamerlynck et al, 2010Hamerlynck et al, , 2020INE, 2007INE, , 2017Maganga et al, 2004;Mbwambo et al, 2012;Mkama et al, 2010;Mwamlavya et al, 2021;Teikwa and Mgaya, 2003;Wanyoni et al, 2016Wanyoni et al, , 2017www.populationstat.com;Zavala-Garay et al, 2015 Supplementary Table S3…”

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confidence: 99%

A regional assessment of seasonal-to-decadal changes in estuarine socio-ecological systems in the Western Indian Ocean

Groeneveld

Santos²,

MacKay³

et al. 2021

West Ind. Oc. J Mar. Sci.

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Estuarine socio-ecological systems (SES) in the Western Indian Ocean (WIO) region face mounting pressures from overexploitation, habitat degradation, impacts of climate change and governance inadequacies. A regional assessment of seasonal-to-decadal change in SES of three estuaries (Bons Sinais in Mozambique, Ruvu in Tanzania and Tana in Kenya) was undertaken along 2000 km of tropical coastline (3°-18°S), using a systems-oriented approach and information collected during the Estuarize-WIO project (2016-2019). All three estuaries were open and tidal, but differed along gradients of geomorphology, annual precipitation, exposure to tropical storms, drought, sea level rise, and rural to urban development. Despite physical differences, similar marine species, mangrove assemblages, seasonality in fish-based farming systems and cultivated crops, and fishing methods were apparent across the region. Key differences were related to the scale of anthropogenic disturbance, discerned from land use / land cover (LULC) change analysis, which showed decadal increases in developed-, cultivated- and grasslands, at the expense of wetlands and forests, and seasonal transformation of wetlands to agriculture and grasslands. The three estuaries represented a gradient along urban-production-conservation dimensions, brought about by rural to urban transformation, and by freshwater and sediment diversion for economic development in upstream catchment areas. Household surveys indicated strongly seasonal livelihood strategies, with highest diversity in peri-urban settings, and reliance on different combinations of ecosystem goods and services in coastal and upstream rural settings. Estuarine fisheriesranged from unselective, low trophic-level fisheries using fine-mesh nets at the urbanized and most-disturbed Bons Sinais Estuary, to a more complex organized fishery at the least-disturbed Tana. At Ruvu, fisheries and agriculture production exit the system to distant markets. The systems-oriented approach demonstrated that human-induced processes affected WIO estuaries and dependent livelihoods more deeply than inherent physical differences. A key conclusion is that research, management and governance will benefit from regional cooperation, given the similarities of the systems and the different levels of disturbance.

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Geomorphology of a tropical river delta under pressure: the Rufiji delta, Tanzania—context, channel connectivity and alongshore morpho-sedimentary and hydrodynamic variability

Anthony

Besset²,

Zăinescu

et al. 2021

Geo-Mar Lett

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Ecological classification of estuaries along the Tanzanian mainland: a tool for conservation and management

Cited by 3 publications

References 17 publications

Spatial variation of nutrients and primary productivity in the Rufiji Delta mangroves, Tanzania

Spatial variation of nutrients and primary productivity in the Rufiji Delta mangroves, Tanzania

A regional assessment of seasonal-to-decadal changes in estuarine socio-ecological systems in the Western Indian Ocean

Geomorphology of a tropical river delta under pressure: the Rufiji delta, Tanzania—context, channel connectivity and alongshore morpho-sedimentary and hydrodynamic variability

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