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Differences in macrofaunal and seagrass assemblages in seagrass beds with and without seaweed farms
Stockholm University, Faculty of Science, Department of Systems Ecology.
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2005 In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, Vol. 63, 385-396 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2005. Vol. 63, 385-396 p.
URN: urn:nbn:se:su:diva-22736OAI: diva2:189341
Part of urn:nbn:se:su:diva-1061Available from: 2006-05-18 Created: 2006-05-18Bibliographically approved
In thesis
1. Humans and Seagrasses in East Africa: A social-ecological systems approach
Open this publication in new window or tab >>Humans and Seagrasses in East Africa: A social-ecological systems approach
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present study is one of the first attempts to analyze the societal importance of seagrasses (marine flowering plants) from a Natural Resource Management perspective, using a social-ecological systems (SES) approach. The interdisciplinary study takes place in East Africa (Western Indian Ocean, WIO) and includes in-depth studies in Chwaka Bay, Zanzibar, Tanzania. Natural and social sciences methods were used. The results are presented in six articles, showing that seagrass ecosystems are rich in seagrass species (13) and form an important part of the SES within the tropical seascape of the WIO. Seagrasses provide livelihoods opportunities and basic animal protein, in from of seagrass associated fish e.g. Siganidae and Scaridae. Research, management and education initiatives are, however, nearly non-existent. In Chwaka Bay, the goods and ecosystem services associated with the meadows and also appreciated by locals were fishing and collection grounds as well as substrate for seaweed cultivation. Seagrasses are used as medicines and fertilizers and associated with different beliefs and values. Dema (basket trap) fishery showed clear links to seagrass beds and provided the highest gross income per capita of all economic activities. All showing that the meadows provide social-ecological resilience. Drag-net fishery seems to damage the meadows. Two ecological studies show that artisanal seaweed farming of red algae, mainly done by women and pictured as sustainable in the WIO, has a thinning effect on seagrass beds, reduces associated macrofauna, affects sediments, changes fish catch composition and reduces diversity. Furthermore, it has a negative effect on i.a. women’s health. The two last papers are institutional analyses of the human-seagrass relationship. A broad approach was used to analyze regulative, normative and cultural-cognitive institutions. Cooperation and conflict take place between different institutions, interacting with their slow or fast moving characteristics, and are thus fundamental in directing the system into sustainable/unsustainable paths. Ecological knowledge was heterogeneous and situated. Due to the abundance of resources and high internal control, the SES seems to be entangled in a rigidity trap with the risk of falling into a poverty trap. Regulations were found insufficient to understand SES dynamics. “Well” designed organizational structures for management were found insufficient for “good” institutional performance. The dynamics between individuals embedded in different social and cultural structures showed to be crucial. Bwana Dikos, monitoring officials, placed in villages or landing sites in Zanzibar experienced four dilemmas – kinship, loyalty, poverty and control – which decrease efficiency and affect resilience. Mismatches between institutions themselves, and between institutions and cognitive capacities were identified. Some important practical implications are the need to include seagrass meadows in management and educational plans, addressing a seascape perspective, livelihood diversification, subsistence value, impacts, social-ecological resilience, and a broad institutional approach.

Place, publisher, year, edition, pages
Stockholm: Institutionen för systemekologi, 2006. 62 p.
seagrasses, social-ecological systems, institutions, seaweed farming, artisanal fisheries, common-pool resources, natural resource management, Zanzibar, Tanzania, East Africa, Western Indian Ocean
urn:nbn:se:su:diva-1061 (URN)91-7155-228-6 (ISBN)
Public defence
2006-06-09, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 13:00
Available from: 2006-05-18 Created: 2006-05-18Bibliographically approved

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