Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Food from the Sulawesi Sea, the need for integrated sea use planning
    Siahainenia, Audrie J. - \ 2016
    Wageningen University. Promotor(en): Herbert Prins; Johan Verreth, co-promotor(en): Fred de Boer. - Wageningen : Wageningen University - ISBN 9789462578869 - 180
    mangroves - mangrove forests - fishes - habitats - marine areas - marine environment - fish stocks - environmental management - ecological disturbance - disturbance - sulawesi - mangroves - mangrovebossen - vissen - habitats - mariene gebieden - marien milieu - visstand - milieubeheer - ecologische verstoring - verstoring - celebes

    Mangroves occur in the tropics and subtropics region and an important coastal habitat for the artisanal fisheries along the coast of Indonesia. Around 19% of the total mangrove area in the world is located in Indonesia. Besides providing a barrier against coastal/Delta erosion, mangrove forest plays a significant role as a nursery area for most of the marine communities. Unluckily, 57% of the ±3.2 million ha of the mangroves in Indonesia is currently in degraded, mostly because of human activities (anthropogenic disturbance). The primary sources of anthropogenic disturbances to mangroves are increasing population growth rate and demand for seafood products as an essential protein, especially the wild shrimp, in the world market. These resulted in land-use conversion along estuarine areas not only for settlements and plantations but also for aquaculture ponds. The lack of awareness and understanding of the value and function of mangrove ecosystems contributed to the loss and damage the mangroves area.

    Therefore, my research and field experiment aimed to quantify the effects of human disturbance on mangroves associated trophic cascades in Indonesia estuarine areas. The study was performed in the Berau District, East Kalimantan, Indonesia between 2005 and 2010. Data of mangrove extent from 1990 in the Berau Delta was used as base data with low human disturbance. We also interviewed the artisanal fishermen about their catches, origins, and fishing locations, in relation to the total catch per unit effort (CpUE).

    The results had shown that the total mangroves area in the Berau Delta decreased by 54% between the 1990 and 2009, which led to fragmentation and alteration in the structural complexity of mangroves. The field experiment conducted at three locations with different levels of human disturbances revealed that the species richness was decreased with increased the level of human interference and the marine community tended to be dominated by only a few species. In the highly disturbed areas, the catch of small-scale fishermen tended to be lower. Furthermore, the result from a spatial statistical model indicated that the disturbance of mangrove habitats was influenced the distribution pattern of shrimp. The total CpUE of small-scale fishery in the study area was relatively small, and the area was probably not overexploited.

    As a conclusion, mangroves habitat in the Berau Delta played a significant role in sustaining coastal fisheries. This important ecosystem supports a primary source of marine protein. Mangrove forests can only guarantee these marine resources if the people consciously maintain its viability through a strong management policy.

    Remote sensing techniques for mangrove mapping
    Vaiphasa, C. - \ 2006
    Wageningen University. Promotor(en): Andrew Skidmore; Herbert Prins, co-promotor(en): Fred de Boer. - [S.l. ] : S.n. - ISBN 9789085043539 - 129
    mangroves - mangrovebossen - vegetatie - remote sensing - karteren - classificatie - mangroves - mangrove forests - vegetation - remote sensing - surveying - classification

    Mangroves, important components of the world's coastal ecosystems, are threatened by the expansion of human settlements, the boom in commercial aquaculture, the impact of tidal waves and storm surges, etc. Such threats are leading to the increasing demand for detailed mangrove maps for the purpose of measuring the extent of the decline of mangrove ecosystems. Detailed mangrove maps at the community or species level are, however, not easy to produce, mainly because mangrove forests are very difficult to access. Without doubt, remote sensing is a serious alternative to traditional field-based methods for mangrove mapping, as it allows information to be gathered from the forbidding environment of mangrove forests, which otherwise, logistically and practically speaking, would be extremely difficult to survey. Remote sensing applications for mangrove mapping at the fundamental level are already well established but, surprisingly, a number of advanced remote sensing applications have remained unexplored for the purpose of mangrove mapping at a finer level. Consequently, the aim of this thesis is to unveil the potential of some of the unexplored remote sensing techniques for mangrove studies. Specifically, this thesis focuses on improving class separability between mangrove species or community types. It is based on two important ingredients:

    (i) the use of narrow-band hyperspectral data, and

    (ii) the integration of ecological knowledge of mangrove-environment relationships into the mapping process.

    Overall, the results of this study reveal the potential of both ingredients. They show that delicate spectral details of hyperspectral data and the spatial relationships between mangroves and their surrounding environment help to improve mangrove class separability at the species level. Despite the optimism generated by the overall results, it was found that appropriate data treatments and analysis techniques such as spectral band selection and noise reduction were still required to harness essential information from both hyperspectral and ecological data. Thus, some aspects of these data treatments and analysis techniques are also presented in this thesis. Finally, it is hoped that the methodology presented in this thesis will prove useful and will be followed for producing mangrove maps at a finer level.

    Remote sensing as a tool for identification of aquacultural systems and mangrove species in the coastal Mekong delta, Vietnam
    Koopmanschap, E. ; Vullings, W. ; Mensvoort, M.E.F. van; Quang Tri, Le; Tromp, M. - \ 2002
    In: Selected papers of the workshop on integrated management of coastal resources in the Mekong delta, Vietnam : Can Tho, Vietnam, August 2000 / van Mensvoort, M.E.F., Quang Tri, Le, - p. 45 - 56.
    mangroves - mangrovebossen - aquacultuur - remote sensing - delta's - vietnam - bebossing - geo-informatie - mangrovebos - Azië - Mekong - mangroves - mangrove forests - afforestation - aquaculture - remote sensing - deltas - vietnam
    The aquaculture activities (shrimp farms) resulted in an unsustainable system with polluted surface water and disease outbreaks. Shrimp farms are nowadays often abandoned again and reforestation is an option
    Growth of Rhizophora mangroves in Vietnam affected by salinity
    Haanstra, L. ; Van Be, Le; Elemans, M. ; Diemont, W.H. - \ 2002
    In: Selected papers of the workshop on integrated management of coastal resources in the Mekong delta, Vietnam : Can Tho, Vietnam, August 2000 / van Mensvoort, M.E.F., Quang Tri, Le, - p. 37 - 43.
    mangroves - mangrovebossen - gewasproductie - verzilting - plant-water relaties - modellen - vietnam - bodem - bosbouw - houtproductie - mangrove - overstroming - Azië - Mekong - mangroves - mangrove forests - crop production - salinization - plant water relations - models - vietnam
    Silvicultural management and land characteristics affecting the growth of rhizopora apiculata in Thanh Phu, Ben Tre Province, Mekong delta, Vietnam
    Mensvoort, M.E.F. van; McKenzie, P. - \ 2002
    In: Workshop on integrated management of coastal resources in the Mekong delta, Vietnam, Can Tho, Vietnam / van Mensvoort, M.E.F., Le Quang, Tri, Wageningen : Wageningen University - ISBN 9789067546744 - p. 57 - 64.
    bodemgeschiktheid - mangrovebossen - bodemzoutgehalte - gewasproductie - vietnam - soil suitability - soil salinity - mangrove forests - crop production - vietnam
    During the Indo-China war an estimated 200,000 ha of Vietnamese mangrove forests were destroyed by chemical warfare. Since the war clearance for aquaculture and population pressure caused further deforestation, particularly in the Mekong delta. Mangrove reforestation is desired. At the state farm at Thanh Phu a combined mangrove - shrimp system has been applied for about ten years
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