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1.
We assess, based on fisheries and interview data collected on-site, whether Malthusian overfishing is occurring in Pulau Banggi, Sabah. Fisheries resources in Pulau Banggi have been perceived to be declining over the past 20 years, and characteristics of Malthusian overfishing are evident, although not at a magnitude comparable with other more heavily exploited artisanal fisheries in the Philippines. It appears that Pulau Banggi's reef fisheries are at an early stage of Malthusian overfishing, and this is therefore a critical time for addressing and mitigating drivers of overfishing to prevent inevitable and further decline of Pulau Banggi's reef fisheries. 相似文献
2.
Brian Wei Khong Chong Sandric Chee Yew Leong Victor S. Kuwahara Teruaki Yoshida 《海洋学报(英文版)》2022,41(12):142-151
Assessments of phytoplankton diversity in Sabah waters, North Borneo, have primarily relied on morphology-based identification, which has inherent biases and can be time-consuming. Next-Generation Sequencing (NGS) technology has been shown to be capable of overcoming several limitations of morphology-based methods. Samples were collected from the Sepanggar Bay over the course of the year 2018 in different monsoon seasons. Morphology-based identification and NGS sequencing of the V8–V9 region of the 18S LSU rDNA were used to investigate the diversity of the phytoplankton community. Microscopy and NGS showed complementary results with more diatom taxa detected by microscopy whereas NGS detected smaller and rarer taxa. The harmful algal genera in the study site comprised of Skeletonema, Margalefidinium, Pyrodinium, Takayama, and Alexandrium as detected by NGS. This study showed that that an integrative approach of both morphological and molecular techniques could provide more comprehensive information about the phytoplankton community as the approach captured quantitative variability as well as the diversity of phytoplankton species. 相似文献
3.
Streamwatcr chemistry was monitored for five years in six streams in a paired catchment experiment in Mendolong, Sabah, Malaysia, including controls in rain forest and secondary vegetation after the [Borneo fire] of 1982–3 and comparing the effects of different ways of establishing forest plantations with Acacia mangium. Three catchments were covered with selectively logged lowland hill dipterocarp forest (W4-W6) and three (W1-W3) with secondary vegetation after forest fires. The control catchments, W3 and W6 reported in this paper, had no treatments applied. Reference monitoring at all streams was for 25 months and the total period of study reported here is 64 months. The soils in the catchments were mainly Orthic Acrisol in W3 and Gleyic Podsol in W6 and a mix of both soil types in the other catchments. Element baseflow concentrations were generally low and not significantly different from stormflow concentrations for all streams during the reference period. Concentrations were also generally consistently low for the two control streams during the whole period of measurement. Chemical inputs as wet deposition were low as a result of a high input from local convection. The rain forest on the Podsol had a tight nutrient circulation indicated by small net losses of macronutrients. The Podsol was found to have poorer conditions for soil mineralization and more surficial runoff, resulting in higher loads of S, C and N in the organic phases, with higher organic C/N ratio, in the discharge. Nitrogen was found to accumulate in both catchments. An almost double accumulation of N in W3 was attributed to a larger biomass accumulation continuing after the forest fire 3–8 years earlier. On the other hand, the Acrisol in W3 had much larger net losses of S, Si, K, Ca, Mg and Na. Most of differences could be attributed to differences in weathering between the soils and local mineralogical differences. 相似文献
4.
以油气地质理论为指导, 在构造、沉积、石油地质特征分析基础上, 从典型油气藏解剖入手, 构建了西北沙巴盆地3种类型的油气成藏模式, 即岩性型、地层型和滚动背斜型油气成藏模式。盆地经历了裂谷期、挤压反转期和拗陷期3个演化阶段, 发育Stage Ⅰ、StageⅡ、StageⅢ、StageⅣ等4套新生代沉积地层。盆地以StageⅣ泥/页岩为主要烃源岩; 有利储集层为由StageⅣC、StageⅣD、StageⅣE砂岩构成的上砂岩单元、由StageⅣA砂岩构成的下砂岩单元及StageⅣC/ⅣD地层滑塌形成的深水浊积砂体; 空间配置方面, 烃源岩与储集体平面相接、空间叠置, 为油气运移成藏提供了有利条件。通过油气富集条件及分布规律的综合分析, 认为"内带"构造区的地层油气藏及"外带"构造区的岩性油气藏是盆地未来的油气勘探重点。 相似文献
5.
The live reef food fish trade (LRFFT) has caused severe depletion of the Humphead wrasse (Cheilinus undulatus) populations globally, a species considered endangered by the International Union for the Conservation of Nature. In 2010, signatories to the Convention on International Trade in Endangered Species of Wild Fauna and Flora recognized that illegal, unregulated, and unreported (IUU) activities in the LRFFT were undermining the efforts to protect this species. Management recommendations have yet to be effectively implemented at national and local levels where the fish is harvested. This paper analyzes the threats to, and socio-economic impacts of, Humphead wrasse recovery in Sabah, Malaysia, and offers both short- and longer-term recommendations for the local recovery of the species. Key issues addressed centre around understanding the threats to recovery, specifically the role of IUU and the context-specific considerations, including the socio-economic aspects of the IUU trade in Sabah. The analysis confirms that deliberate management planning and action at multiple levels are required to prevent local-scale extinction. Lessons for other species and countries involved in the LRFFT suggest that to be effective, broad management frameworks must be tailored to local situations and must focus on gaining support and participation of fish harvesters if the recovery and long-term sustainability of both the Humphead wrasse and the LRFFT are to be achieved. 相似文献
6.
A challenge of managing data poor fisheries lies in overcoming uncertainties associated with a lack of information on biological and socio-economic conditions. This paper focuses on site prioritisation for marine protected areas, a process that usually imposes moderate to heavy demands on data, time, local expertise, and funds. A fuzzy logic decision support tool for zoning marine areas that is suitable for use in data poor conditions is developed. This tool, the Protected Area Suitability Index (PASI), assesses the suitability of sites for protection based on fishers’ preferences for that site and the site’s conservation value. Only eight input attributes are required to run the PASI, which operates on a series of heuristic rules to estimate a site suitability score that ranges from 0 to 10, where 10 indicates that a site is highly suitable for being protected from fishing. Sensitivity analysis reveals that the PASI is relatively robust, and produces reliable results even as the system is degraded by the loss of data. Eighteen actively fished sites and 11 sites that are closed to fishing are assessed to evaluate how well the PASI is able to distinguish differences between sites. The estimated scores are significantly different (p<0.05), whereby non-fished sites are scored as being more suitable for protection than fished sites. The PASI can be used as a decision support tool to facilitate systematic marine spatial management under data poor conditions, especially in the task of identifying suitable sites for protection. 相似文献
7.
Abstract. Red tides of the toxic dinoflagellate Pyrodinium bahamense var. compressum have occurred almost annually since 1976 in the coastal waters of the west coast of Sabah, Malaysia. Field obSérvations have indicated that the timings of these outbreaks could be linked to meteorological forcings. All the red tides have occurred during either the northeast or southwest monsoon periods. Matching of red tide outbreaks with total monthly rainfall, monthly-averaged index of wind-induced surface water mixing, and monthly-averaged upwelling index for the period from 1975 to 1989 failed to show any definite pattern. However, more red tide events occurred in months with high mixing index values. The absence of definable patterns could be due to the use of monthly, rather than daily, values in the calculations. 相似文献
8.
《Singapore journal of tropical geography》2001,22(1):106-112
Books reviewed:
Roderick P. Neumann, Imposing Wilderness: Struggles over Livelihood and Nature Preservation in Africa
Richard A. Schroeder, Shady Practices: Agroforestry and Gender Politics in The Gambia
Adebayo Adedeji (ed.), Comprehending and Mastering African Conflicts: The Search for Sustainable Peaceand Good Governance
Hilgard O'Reilly Sternberg, A água e o homem na várzea do Careiro 相似文献
Roderick P. Neumann, Imposing Wilderness: Struggles over Livelihood and Nature Preservation in Africa
Richard A. Schroeder, Shady Practices: Agroforestry and Gender Politics in The Gambia
Adebayo Adedeji (ed.), Comprehending and Mastering African Conflicts: The Search for Sustainable Peaceand Good Governance
Hilgard O'Reilly Sternberg, A água e o homem na várzea do Careiro 相似文献
9.
During the Paleogene the Proto-South China Sea was subducted beneath northern Borneo. Subduction ended with Early Miocene collision of the Dangerous Grounds/Reed Bank/North Palawan block and the Sabah–Cagayan Arc. Much of northern Borneo then became emergent forming the Top Crocker Unconformity. Later in the Early Miocene subsidence resumed. It is proposed that northward subduction of the Celebes Sea initiated formation of the Sulu Sea backarc basin, followed by subduction rollback to the SE. This formed a volcanic arc, which emerged briefly above sea level and collapsed in the Middle Miocene. As rollback continued the Sulu Arc was active during Middle and Late Miocene between Sabah and the Philippines. Rollback drove extension in northern Borneo and Palawan, accompanied by elevation of mountains, crustal melting, and deformation offshore. There were two important extensional episodes. The first at about 16 Ma is marked by the Deep Regional Unconformity, and the second at about 10 Ma produced the Shallow Regional Unconformity. Both episodes caused exhumation of deep crust, probably on low angle detachments, and were followed by granite magmatism. The NW Borneo–Palawan Trough and offshore Sabah fold and thrust belt are often interpreted as features resulting from collision, regional compression or subduction. However, there is no seismicity, dipping slab or volcanicity indicating subduction, nor obvious causes of compression. The trough developed after the Middle Miocene and is not the position of the Paleogene trench nor the site of Neogene subduction. Inboard of the trough is a thick sediment wedge composed of an external fold and thrust belt and internal extensional zone with structures broadly parallel to the trough. The trough is interpreted as a flexural response to gravity-driven deformation of the sediment wedge, caused by uplift on land that resulted from extension, with a contribution of deep crustal flow. 相似文献
10.
Keith Sutton 《Singapore journal of tropical geography》2001,22(1):90-105
While agribusiness is normally associated with western multinational companies, Malaysia provides an alternative example of a Third World agribusiness, the Federal Land Development Authority (FELDA). FELDA has evolved through an advisory stage and then a major land settlement agency phase, assisting Malaysia's rural poor, to its present position as a major employer of immigrant agricultural labour and as a large commercial business in palm oil exporting. This recent agribusiness approach is best exemplified by FELDA's Sahabat complex of 54 schemes in Eastern Sabah. There, mono‐cultural oil palm cropping has been successfully developed while earlier environmental concerns have been largely ignored. Plans for Sahabat have been modified to accommodate immigrant labourers from Indonesia and the Philippines rather than local settlers from Malaysia. A modernised plantation approach has taken over from the initial contract farming and social engineering approach. 相似文献