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  • Mangroves  (3)
  • Soil preference  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 70 (1983), S. 77-93 
    ISSN: 1573-5036
    Keywords: Adsorption ; Calcium ; Calcium carbonate ; Cation Exchange Capacity ; Hydrogen ; Magnesium ; Moss ; pH ; Potassium ; Sodium ; Soil preference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Moss species with a different soil preference with respect to its acidity and carbonate content also differ in their cation exchange capacity (leaf, stem, rhizoid), the acidiphile-calcifuges having lower C.E.C. values than the neutrophile-calcicoles. The higher the C.E.C. value, the more the divalent cations calcium and magnesium tend to be adsorbed as compared to the monovalents sodium and potassium, from an equinormal tetracationic solution. The increase in divalent adsorption is mainly due to calcium. Considering this differential adsorption of calcium and in view of data in literature on membrane characteristics, it appears that among the studied cations calcium is an important factor in the observed soil preference through its presence in the cell wall adsorbed fraction and thus in the membrane environment.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5036
    Keywords: Aluminium ; Asplenium trichomanes ; CaCO3 ; Calcicole ; Calcifuge ; C.E.C. ; Fern ; Hydrogen pH ; Polypodium vulgare ; Soil preference ; Subspecies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A number of populations ofPolypodium vulgare L. andAsplenium trichomanes L. were sampled with corresponding soils in Belgium in order to get an idea of their suitability for the investigation of related calcicole and calcifuge taxa. Morphology and cytology enabled us to distinguish the subspecies and the hybrids. Analyses of the soils for pH, CaCO3, Al and H show that subspecies and hybrids have distinct soil preferences and can be characterised as calcicoles-neutrophile/basiphiles or calcifuge-acidiphiles. Physiological implications of the ecological status of the taxa are discussed in the light of their root cation exchange capacity.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2021-05-19
    Description: Mida Creek (Kenya) comprises mangrove forests and other marine resources that are of economic, ecological and environmental importance to the local village communities. In total 116 households (100 of which could be used for numerical analysis), which are estimated to correspond to a coverage of ca. 30 % of the total Mida Creek population, were interviewed to assess the human reliance on mangrove resources in Mida Creek. The survey indicates that mangroves are a major resource of wood for house construction, fuelwood, charcoal and boat building. Minor uses of mangrove products include pharmaceutical and medicinal applications, tanning material and furniture making. Rhizophora mucronata, Ceriops tagal and Bruguiera gymnorrhiza are the major resources for house construction and fuelwood, while Sonneratia alba and Xylocarpus granatum were reported to be useful for boat building and medicinal uses respectively. The survey further describes harvesting activities and house construction, and reveals species preferences within this one particular use. As a result of depletion of the supply and the banning of mangrove harvesting, the local people are turning to other wood materials and to poaching. In our view, local utilization patterns rather than global usefulness data are required to establish a conservation policy of both mangroves and users’ subsistence requirements.
    Description: Published
    Keywords: Survey analysis ; Ethnobotany ; Wood ; Kenya ; Wood ; Mangroves
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: 686064 bytes
    Format: application/pdf
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  • 4
    Publication Date: 2021-05-19
    Description: Historic environmental, faunal, floral and socioeconomic data of Gazi Bay in coastal Kenya were collated and integrated into a GIS environment and data of impacts due to various factors were then related to remotely sensed data. Rhizophora mucronata, a valuable mangrove species, was investigated. Very low values of basal area (7.7 m2/ha and 4.9 m2/ha) and complexity indices (1.86 and 1.12) at Makongeni and Kinondo 1, respectively, reflected intense human pressure in these areas. Areas that were easily accessible or close to human settlements appeared more vulnerable. Accrued information from a socioeconomic survey carried out over the same period corroborates the hypothesis that human influence was a major contributor to these changes. Historic aerial photographs together with satellite imagery indicate less than 20% decrease in coverage of R. mucronata between 1965 and 1992, but an increase of almost 35% in sand cover over the same period. The approach that was used in this study, one largely unprecedented in the East African region, was useful in drawing the conclusion that human influence was the most probable trigger of the observed changes.
    Description: Published
    Description: floral; socioeconomic;Rhizophora mucronata
    Keywords: Environmental impact ; Ecology ; Environmental monitoring ; Mangroves ; Fauna ; Satellite imagery
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
    Format: 2144912 bytes
    Format: application/pdf
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  • 5
    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
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