Seagrass Biomass and Productivity in Seaweed and Non-Seaweed Farming Areas in the East Coast of Zanzibar,

Lyimo, Thomas J.; Mvungi, Esther F.; Lugomela, Charles; Björk, Mats

doi:10.4314/wiojms.v5i2.28506

Cited by 23 publications

(52 citation statements)

References 13 publications

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“…Martin and Bandeira 2001, Eklof et al 2005, Lyimo et al 2006. Generally, the above-ground biomass was lower than below-ground biomass (Fig.…”

Section: Discussionmentioning

confidence: 86%

“…2005). However, Lyimo et al (2006) showed that there was no significant difference in primary productivity and growth rates between seagrass meadows at Chwaka Bay and Jambiani. The possible reasons remain mechanical abrasion by the algal fronds, trampling and deliberate removal of seagrasses by farmers (de la Torre Castro and Ronnback 2004) which might reduced shoot density as well as above ground biomass.…”

Section: Discussionmentioning

confidence: 87%

“…As a consequence farmers at Jambiani leave patches of seagrass meadows less disturbed. However, some farmers uproot seagrasses manually to open up areas for seaweed farms (Lyimo et al 2006). Shading and competition for nutrients in the water has been suggested to be among the factors that might result into reduction of primary productivity and growth rates and hence biomass of seagrass (Eklöf et a l .…”

Section: Discussionmentioning

confidence: 99%

“…Discharges from agriculture runoff, industrial runoff and domestic sewage may contain a lot of organic and inorganic nutrients, chlorines and some heavy metals which may damage seagrass ecosystems (Lobban andHarrison 1994, Lugendo et al 1999). In the Western Indian Ocean (WIO) region, the documented disturbances to seagrass habitats include manual removal of seagrasses for hotel development in Mauritius (Daby et al 2003), beach cleaning activities (Ochieng and Erftemeijer 2003) and the uprooting of seagrasses for invertebrate collection (Bandeira and Gell 2003) or seaweed farming (de la Torre Castro and Rönnbäck 2004, Lyimo et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…2005) large invertebrate epifauna and fish community (Bergman et al 2001, Eklof et al 2006. Current existing studies on the effect of seaweed farming on seagrass ecosystem were based on the data collected in one season (Semesi 2002, Lyimo et al 2006) and in one location e.g. Chwaka Bay (Eklof et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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abundance and diversity of seagrass and macrofauna in the intertidal areas with and without seaweed farming activities in the east coast of Zanzibar

Lyimo

Mvungi²,

Mgaya³

2009

Tanz. J. Sci.

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“…Martin and Bandeira 2001, Eklof et al 2005, Lyimo et al 2006. Generally, the above-ground biomass was lower than below-ground biomass (Fig.…”

Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

abundance and diversity of seagrass and macrofauna in the intertidal areas with and without seaweed farming activities in the east coast of Zanzibar

Lyimo

Mvungi²,

Mgaya³

2009

Tanz. J. Sci.

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Seagrass–sea urchin interaction in shallow littoral zones of Dar es Salaam, Tanzania

Mamboya¹,

Lugomela²,

Mvungi³

et al. 2009

Aquatic Conservation

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À2 in the lower littoral zone at Mbudya Island. 3. Seagrass biomass, canopy height and percentage cover differed significantly among study sites (P 5 0.001, 0.0001, 0.008 respectively). However, there was no significant difference in shoot density among the sites (P 5 0.376).4. Ten species of sea urchins were recorded, Echinometra mathaei being the most abundant followed by Tripneustes gratilla. Total sea urchin abundance was significantly different among the study sites (P 5 0.001). Seagrass-sea urchin interaction was depicted by significant negative correlations between sea urchin densities with seagrass biomass, canopy height, shoot density and percentage cover. This suggests that grazing by sea urchins might have contributed to the reduction of above ground seagrass biomass in locations with higher sea urchin densities. However, further studies are required to corroborate the present results and assess effects of other factors (e.g. light, nutrients and currents), which also influence seagrass growth.

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Seaweed farming pressure affects seagrass and benthic macroalgae dynamics in Chwaka Bay (Zanzibar, Tanzania)

et al. 2021

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Farming of Eucheuma denticulatum is a major activity in Zanzibar affecting seagrass ecosystems primarily through shading and trampling. The aim of this study was to test the impacts of shading and trampling during seaweed farming on seagrass meadows composed by Halophila stipulacea and Thalassia hemprichii and their associated benthic macroalgae. Areas covered by these species were selected for the building of seaweed farms in three treatments: seaweed farm plots (with shading and trampling effects), trampling plots (with trampling effects only), and control plots (with no shading or trampling effects). Reduction of light within the plots was recorded over 9 weeks. Percentage cover of seagrasses and macroalgae and shoot density of seagrasses were measured over 12 weeks to assess the impact of shading and trampling by seaweed farming activities. Light was significantly reduced in the seaweed farm plots by 75 to 90% by the end of a seaweed growth cycle. H. stipulacea, despite its capacity for rapid growth, was significantly affected by the combination of shading and trampling under the seaweed farm treatment, while the climax seagrass species T. hemprichii was unaffected. Due to the decline in H. stipulacea, benthic macroalgae cover increased in the seaweed farm treatment, suggesting a change in seagrass community dynamics. In contrast, trampling had a negative effect on the benthic macroalgae as an isolated disturbance, which suggests that seagrasses are more resistant to trampling than macroalgae and would likely dominate the benthic macrophyte community under these conditions.

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Seagrass Biomass and Productivity in Seaweed and Non-Seaweed Farming Areas in the East Coast of Zanzibar,

Cited by 23 publications

References 13 publications

abundance and diversity of seagrass and macrofauna in the intertidal areas with and without seaweed farming activities in the east coast of Zanzibar

abundance and diversity of seagrass and macrofauna in the intertidal areas with and without seaweed farming activities in the east coast of Zanzibar

Seagrass–sea urchin interaction in shallow littoral zones of Dar es Salaam, Tanzania

Seaweed farming pressure affects seagrass and benthic macroalgae dynamics in Chwaka Bay (Zanzibar, Tanzania)

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