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  • 2015-2019  (2)
  • 1
    Publication Date: 2021-05-19
    Description: Mangrove forests consist of a mosaic of tree cohorts, each having a regeneration history that depends on episodic recruitment of seedlings based on the availability of a “regeneration niche”. The aim of this study was to assess seedling population structure in Ceriops tagal natural monospecific stands and one eight-year old reforested stand at Gazi Bay, Kenya, to determine performance in terms of growth and survival over a period of two years. Four natural monospecific stands (two on the western creek designated as site 1 and 2, and two on the eastern creek designated as site 4 and 5) were identified with the reforested stand (on the eastern creek) as site 3. The vegetation structure of these stands and natural regeneration were assessed by Linear Regeneration Sampling. Regeneration Class I (RCI) seedlings of known age were tagged and their growth parameters (diameter, height, leaf production and number of nodes) and survival rates monitored for a period of two years. The reforested stand had the same basal area (2.2 ± 0.1 m2 ha-1) as site 1 (2.1 ± 0.1 m2 ha-1), and the former’s mean height was also similar to that of western creek sites (1 and 2), but lower than the eastern creek sites (4 and 5). The western creek sites had the highest seedling mortality (61 % for both) and lowest growth rates recorded over the two year period compared to a mortality of 45 % for the eastern sites. An analysis of seedling growth over the two years as a function of measured environmental factors showed a weak interaction, with height above datum (HAD) and canopy cover showing the highest correlation of only 30 %. The high mortality on the western creek sites may be attributed to harsh environmental conditions due to the limited expanse of the intertidal area of the western creek mangroves compounded with anthropogenic pressure due to its proximity to human settlements. Overall, C. tagal forests at Gazi Bay seem to be more vulnerable to environmental stress because they occur at the upper intertidal area, which limits their long-term structural development. Of the four species common at Gazi, C. tagal is the least structurally developed with very low basal areas and mean heights, which are both important determinants of wood quality. These upper-shore forests therefore require management approaches distinct from those of other species to ensure that their natural regeneration and overall structural development are not unsustainably compromised.
    Description: Published
    Keywords: Seedling growth ; Recruitment ; Natural regeneration ; Ceriops tagal
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp.69-80
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2021-05-19
    Description: This study presents an assessment of a unique exploitation of a peri-urban mangrove. The diversity of respondents, spread over wide areas, some with no apparent links with the ecosystem, coupled with legal and illegal resource exploitation, in the midst of inadequate but punitive enforcement meted on impoverished communities, pose significant challenges in conducting questionnaire surveys. Potentially limiting if not inhibiting information flow. Mangrove wood is exploited at both subsistence and commercial scales, firewood being the most ubiquitous form of use at both urban and rural settings. Forest assessments indicate the lack of preferred or specific harvesting sites. Though harvesting location is mostly dependent on profession. R. mucronata is the most harvested mangrove species. The study shows that resource exploitation is intense and “efficient” in an urban setting due to the economic drive and high demand emanating from a high human population. This has given rise to practices that mitigate against traditional norms, promoting destructive unsustainable harvesting. The outcome is the gross under-valuing of ecosystem goods and services in addition to degrading the ecosystem. The management of mangroves for wood extraction in urban areas may not be a viable and/or sustainable option, as it conflicts with functions of mangrove ecosystems, otherwise important in „resource limited‟ urban environment. It is recommended that a participatory and adaptive management, considering multiple uses and users is the viable way to manage peri-urban mangroves. this will ensure social and ecological resilience in the long-run. However, this may require specific legislative, education and institutional interventions. Integrating local ecological knowledge, may further promote a participatory approach and expedite the formulation of sustainable management plans for peri-urban mangroves.
    Description: Mohamed, M. O. S., Kairo, J. G., Dahdouh-Guebas, F. and Koedam N. 2008. How Sustainable is the Utilization of Mangrove Products in Peri-Urban Mombasa, Kenya? Ecology and Society, Manuscript #: ES-2008-2617, Version 1 .
    Description: Published
    Keywords: Mangroves ; Urbanization ; Harvesting ; Exploitation ; Firewood
    Repository Name: AquaDocs
    Type: Report , Not Known
    Format: pp.56-81
    Location Call Number Limitation Availability
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