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

Mamboya, Florence; Lugomela, Charles; Mvungi, Esther F.; Hamisi, Mariam; Kamukuru, Albogast T.; Lyimo, Thomas J.

doi:10.1002/aqc.1041

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…Seagrasses in Ocean Road occur in patches with no uniform pattern in distribution and T. hemprichii and Cymodocea rotundata are the dominant seagrass species (Lugendo et al, 1999). In Mbweni, S. isoetifolium is the dominant species followed by T. hemprichii (Mamboya et al, 2009). …”

Section: Study Areamentioning

confidence: 97%

Effect of nutrient enrichment on seagrass associated meiofauna in Tanzania

Daudi

Lugomela

Uku

et al. 2012

Marine Environmental Research

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Section: Study Areamentioning

confidence: 97%

Effect of nutrient enrichment on seagrass associated meiofauna in Tanzania

Daudi

Lugomela

Uku

et al. 2012

Marine Environmental Research

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“…Substrates found in the Hative Village bottom waters are a mixture of sand and coral. T. gratilla can live well in the area of seagrass, but seagrass was not found in this area (Figure 2a), while seagrass and algae have an important role for the growth of T. gratilla [20,21]. Conditions of water temperature at this location did not have a significant variation, relatively similar in the range of 24,9°C.…”

Section: Resultsmentioning

confidence: 87%

Spatial Distribution and Genetic diversity of Tripneustes gratilla in Ambon Island

Silahooy¹,

Hakim²,

Toha³

et al. 2013

JTLS

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Tripneustes gratilla has an important ecological role in various habitats because T. gratilla is directly or indirectly recycling key from the nutrients in the waters of Ambon Island. Ambon Island has a distinctive topography, thus causing inhibition of water exchange period naturally in Ambon Bay. In addition the increasing environmental pollution can narrow the habitat of T. gratilla. Therefore, this study aimed to determine the spatial distribution of sea urchins (T. gratilla) on Ambon. Distribution of T. gratilla population that found in Ambon Island generally has a relatively small number of individuals. From four locations that just only one location has large enough number of individuals. Therefore it is necessary to conserve T. gratilla on Ambon Island so that it won't extinct.

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“…Sea urchins play an important herbivory role, affecting the density of seagrass meadows [90,112,113]. We observed large differences in the densities of sea urchins among the nine sites, with the largest densities in Chapwani and Jambiani.…”

Section: Characterization Of Habitats Using In Situ Imagerymentioning

confidence: 74%

Drone-Based Characterization of Seagrass Habitats in the Tropical Waters of Zanzibar

et al. 2022

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Unmanned automatic systems (UAS) are increasingly being applied as an alternative to more costly time-consuming traditional methods for mapping and monitoring marine shallow-water ecosystems. Here, we demonstrate the utility of combining aerial drones with in situ imagery to characterize the habitat conditions of nine shallow-water seagrass-dominated areas on Unguja Island, Zanzibar. We applied object-based image analysis and a maximum likelihood algorithm on the drone images to derive habitat cover maps and important seagrass habitat parameters: the habitat composition; the seagrass species; the horizontal- and depth-percent covers, and the seascape fragmentation. We mapped nine sites covering 724 ha, categorized into seagrasses (55%), bare sediment (31%), corals (9%), and macroalgae (5%). An average of six seagrass species were found, and 20% of the nine sites were categorized as “dense cover” (40–70%). We achieved high map accuracy for the habitat types (87%), seagrass (80%), and seagrass species (76%). In all nine sites, we observed clear decreases in the seagrass covers with depths ranging from 30% at 1–2 m, to 1.6% at a 4–5 m depth. The depth dependency varied significantly among the seagrass species. Areas associated with low seagrass cover also had a more fragmented distribution pattern, with scattered seagrass populations. The seagrass cover was correlated negatively (r2 = 0.9, p < 0.01) with sea urchins. A multivariate analysis of the similarity (ANOSIM) of the biotic features, derived from the drone and in situ data, suggested that the nine sites could be organized into three significantly different coastal habitat types. This study demonstrates the high robustness of drones for characterizing complex seagrass habitat conditions in tropical waters. We recommend adopting drones, combined with in situ photos, for establishing a suite of important data relevant for marine ecosystem monitoring in the Western Indian Ocean (WIO).

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

Cited by 9 publications

References 34 publications

Effect of nutrient enrichment on seagrass associated meiofauna in Tanzania

Effect of nutrient enrichment on seagrass associated meiofauna in Tanzania

Spatial Distribution and Genetic diversity of Tripneustes gratilla in Ambon Island

Drone-Based Characterization of Seagrass Habitats in the Tropical Waters of Zanzibar

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