Estuarize-WIO: A socio-ecological assessment of small-scale fisheries in estuaries of the Western Indian Ocean

Groeneveld, Johan C.; Hoguane, A. M.; Kuguru, Baraka; MacKay, Fiona; Munga, Cosmas N.; Santos, J. Freitas

doi:10.4314/wiojms.si2021.1.1

Cited by 3 publications

(3 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Existing information on the geographical setting, ecosystems and socio-ecological importance, and key drivers of socio-ecological change around the Tana Estuary have been summarized in the introductory paper of this Special Issue (Groeneveld et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

Natural resource-use in the Lower Tana River Delta based on household surveys and remote sensing of land cover and land use patterns

Mwamlavya

Munga²,

Fulanda

et al. 2021

West Ind. Oc. J Mar. Sci.

Self Cite

View full text Add to dashboard Cite

Household survey data and spatially explicit Sentinel-2 satellite images of land cover and land use during the dry and wet seasons were used to investigate livelihood strategies in the Lower Tana River Delta in Kenya, where food security and economic activity rely almost exclusively on ecosystem goods and services. Land cover classification of satellite imagery successfully showed seasonal changes to estuary-related vegetation and habitats from which land use cycles could be inferred. Flood-recession agriculture and part-time fishing were the most common activities at Ozi village, some 10 km upstream from the estuary mouth, whereas full-time fishing dominated activities at Kipini town, where the Tana Estuary discharges into Ungwana Bay. Seasonality of fishing at Kipini depended on favourable sea conditions, arrival of migrant fishers and peaks in shrimp abundance. Seasonality of agriculture at Ozi depended on the freshwater flooding regime, visible in satellite images as an inverse relationship of areas covered by wetlands and cultivated lands. The predominance of fishing assets at Kipini indicated specialization, which underlies a socio-economic network of fish processing, marketing, distribution and logistical support services. In contrast, mixed farming assets and traditional fishing gear at Ozi reflected more diversified farmer-fisher livelihoods, as a risk avoidance strategy. Key outcomes of this study were that land cover and land use were strongly seasonal, that coastal and upstream communities in the Tana Estuary relied on different combinations of ecosystem goods and services, and that livelihood strategies at the two locations differed fundamentally. Combining social, spatial and ecological data to describe socio-ecological systems typical of the Tana Estuary provided a broad platform for shared resource management strategies.

show abstract

Section: Methodsmentioning

confidence: 99%

Natural resource-use in the Lower Tana River Delta based on household surveys and remote sensing of land cover and land use patterns

Mwamlavya

Munga²,

Fulanda

et al. 2021

West Ind. Oc. J Mar. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The geographic and ecosystem aspects and the socio‐ecological importance of the estuaries are described by Groeneveld et al . (2021). The Bons Sinais estuary presents peculiar characteristics that favour the abundance of fishing resources, from the influence of the dynamics of saline gradients to seasonal freshwater runoff.…”

Section: Figurementioning

confidence: 99%

First record of mudskipper Boleophthalmus dussumieri (Gobiidae: Oxudercinae) on the coast of Mozambique and evidence of two putative lineages along its known distribution range

Muhala

Guimarães‐Costa

Macate

et al. 2022

Journal of Fish Biology

View full text Add to dashboard Cite

Boleophthalmus dussumieri is one of the most widely distributed mudskippers and is native to the Persian Gulf in Iran down to the northeast of the Arabian Sea and the coast of India. Nonetheless, the present study is the first to confirm the presence of B. dussumieri in the marine areas of the Mozambique coast. In addition, molecular analysis revealed strong evidence for the existence of two lineages with a high level of nucleotide divergence along the sampled area, revealing a still‐neglected taxonomic condition for this lineage/species.

show abstract

“…The geographical setting, ecosystems and socio-ecological importance of the Bons Sinais Estuary were summarized by Groeneveld et al (2021). In brief, the estuary is shallow and funnel-shaped, about 30 km long with a maximum width of 2.5 km near the mouth (Mazzilli, 2015).…”

Section: Study Areamentioning

confidence: 99%

The residual circulation profile of the Bons Sinais Estuary in central Mozambique - potential implications for larval dispersal and fisheries

Hoguane

Gammelsrød²,

Furaca³

et al. 2021

West Ind. Oc. J Mar. Sci.

Self Cite

View full text Add to dashboard Cite

The residual circulation in estuaries determines the net exchange of water, heat, salt, fine sediments and drifting biological organisms between estuarine and nearshore marine waters. The Bons Sinais Estuary in central Mozambique is ~ 30 km long with the city of Quelimane and an industrial port on the northern bank of its upper reaches. To investigate residual circulation in the estuary, seasonal (wet, dry and transition season) CTD profiling data were collected at 11 fixed stations between the upper estuary and mouth, and vertical current profiles were measured over a full tidal cycle at a fixed mid-estuary station. Strong longitudinal gradients in salinity and density indicated that the estuary was river-dominated during the wet season and tide-dominated during the dry season, but the water column remained partially mixed. Tidally averaged vertical profiles from the mid-estuary station revealed: uniform vertical temperatures, warmest during the wet season; depth-stratified salinity during the wet season, but uniform profiles during the dry and transition seasons with highest salinity during the dry season when the density was also highest. The density was uniform and somewhat lower in the transition season, and in the wet season the density was even lower, but stratified. The vertical velocity profile showed a classical two-layer circulation model, with downstream flow intensifying at the surface, and upstream flow at the bottom, during the wet and transitory seasons, when freshwater discharges into the estuary. The flow velocities obtained from a calibrated Hansen and Rattray model fitted the observed data well, confirming that a simplified modelling approach is adequate to describe the residual flow of the Bons Sinais Estuary. The residual circulation model provides insights useful for fisheries research and predicting the spread of water-borne pollutants in the estuary.

show abstract

Estuarize-WIO: A socio-ecological assessment of small-scale fisheries in estuaries of the Western Indian Ocean

Cited by 3 publications

References 43 publications

Natural resource-use in the Lower Tana River Delta based on household surveys and remote sensing of land cover and land use patterns

Natural resource-use in the Lower Tana River Delta based on household surveys and remote sensing of land cover and land use patterns

First record of mudskipper Boleophthalmus dussumieri (Gobiidae: Oxudercinae) on the coast of Mozambique and evidence of two putative lineages along its known distribution range

The residual circulation profile of the Bons Sinais Estuary in central Mozambique - potential implications for larval dispersal and fisheries

Contact Info

Product

Resources

About