Knowledge gaps in tropical Southeast Asian seagrass systems

Seagrasses are habitats with significant ecological and economic functions but we have limited knowledge of seagrasses in Southeast Asia, the hypothesized centre-of-origin for tropical seagrasses. There have been only 62 ISI-cited publications on the seagrasses of Southeast Asia in the last three decades and most work has been in few sites such as Northwest Luzon in the Philippines and South Sulawesi in Indonesia. Our understanding of the processes driving spatial and temporal distributions of seagrass species here has focussed primarily on backreef and estuarine seagrass meadows, with little work on forereef systems. We used Pulau Tinggi, an island off the southeast coast of Peninsular Malaysia, as an example of a subtidal forereef system. It is characterized by a community of small and fast growing species such as Halophila ovalis (mean shoot density 1454.6 ± 145.1 m⁻²) and Halodule uninervis (mean shoot density 861.7 ± 372.0 m⁻²) growing in relatively low light conditions (mean PAR 162.1 ± 35.0 μmol m⁻² s⁻¹ at 10 m depth to 405.8 ± 99.0 μmol m⁻² s⁻¹ at 3 m water depth) on sediment with low carbonate (mean 9.24 ± 1.74 percentage dry weight), organic matter (mean 2.56 ± 0.35 percentage dry weight) and silt-clay content (mean 2.28 ± 2.43 percentage dry weight). The literature reveals that there is a range of drivers operating in Southeast Asian seagrass systems and we suggest that this is because there are various types of seagrass habitats in this region, i.e. backreef, forereef and estuary, each of which has site characteristics and ecological drivers unique to it. Based on our case study of Pulau Tinggi, we suggest that seagrasses in forereef systems are more widespread in Southeast Asia than is reflected in the literature and that they are likely to be driven by recurring disturbance events such as monsoons, sediment burial and herbivory.     

A review of Lower and Middle Palaeozoic biostratigraphy in west peninsular Malaysia and southern Thailand in its context within the Sibumasu Terrane

Fossils from the Cambrian to Devonian rocks of southern Thailand, the Langkawi Islands, mainland Kedah, Perlis, north Perak and central West Peninsular Malaysia are listed and reviewed, and their stratigraphy and correlation reassessed. The hitherto anomalous record of the trilobite Dalmanitina from Malaysia is reviewed and found to be of latest Ordovician (Hirnantian) age, rather than Lower Silurian age as previously reported, and is considered a probable synonym of the widespread Mucronaspis mucronata. A new stratigraphical nomenclature is erected for part of the Langkawi, mainland Kedah and Perlis area successions, in which the term Setul Limestone (which stretched from the Ordovician to the Devonian) is abandoned and replaced by the Middle Ordovician Kaki Bukit Limestone, the late Ordovician and early Silurian Tanjong Dendang Formation, the Silurian Mempelam Limestone, and the early Devonian Timah Tasoh Formation, all underlying the paraconformity with the late Devonian Langgun Red Beds. There was a single depositional basin in the generally shallow-water and cratonic areas of southern Thailand, Langkawi, and mainland Kedah and Perlis, in contrast to the deeper-water basin of north Perak. Only Silurian rocks are dated with certainty within another basin in central West Malaysia, near Kuala Lumpur, which were also cratonic and shallow-water, although to the east in west Pahang there are basal Devonian deeper-water sediments with graptolites. The area is reviewed in its position within the Sibumasu Terrane, which, in the Palaeozoic, also included central and northern Thailand, Burma (Myanmar) and southwest China (part of Yunnan Province).     

THE EXTRAORDINARY AND THE EVERYDAY IN EXPLANATIONS OF VULNERABILITY TO AN OIL SPILL

ABSTRACT. Losses from an oil spill in 1992 differed substantially among coastal resource users on the Malaysian island of Langkawi. Even among the small-scale fishers, those generally considered to be the most vulnerable to such an event, losses varied significantly. This investigation of vulnerability examines causes for the distribution of losses, including fishers' ability to mediate their exposure to risks and the variety of coping strategies they adopted. Explanations for differences in vulnerability are found both in the everyday interactions of processes shaping vulnerability and in the ways in which the “extraordinary” circumstances of a disaster alter those everyday processes.     

Holocene coastal response to monsoons and relative sea-level changes in northeast peninsular Malaysia

Sedimentological, geomorphic, and ground penetrating radar (GPR) data are combined with optically stimulated luminescence data to define the Holocene evolution of a coastal system in peninsular Malaysia. The Setiu coastal region of northeast Malaysia comprises five geological and geomorphic units representing distinct evolutionary phases of this coastline. Estimated marine limiting point elevations indicate deposition of an early aggradational shoreline associated with a sea-level elevation of −0.1 to +1.7 m (MSL_PMVGD datum) between ∼6.8 ka and 5.7 ka, in agreement with previous sea-level studies from the Malay–Thai peninsula. A hiatus occurs in the record between ∼5.7 ka and 3.0 ka, possibly due to a relative sea-level oscillation and shoreline erosion. Long-term relative sea-level fall and possible still-stands created strandplains that are interrupted by aggradational to transgressive paleo-barrier and estuary formation corresponding with brief episodes of RSL rise. Analyses of GPR facies and OSL ages suggest annual clinoform deposition, with geometries dictated by variations in ENSO. These data demonstrate the utility of high resolution studies of coastal facies as useful proxy indicators for paleoclimate studies at subdecadal to millennial time-scales.     

热带山地表土植硅体组合对植被的指示——以马来西亚Jerai山为例

热带雨林植物花粉较低的表现力阻碍了东南亚地区冰期时古植被的精确重建。本研究分析了热带地区马来西亚Jerai山的14个不同海拔高度的表土植硅体样品,目的是评估植硅体是否可以作为古植被重建的关键指标。我们发现了17个植硅体形态类型,它们包括鞍型、棒型、多裂梯型、木本不规则形态、矩形、板型、维管组织、方型、块状、塔型、双裂片型、十字型、硅化气孔、球型、椭球型、楔型、楔型泡状细胞等。球型占据绝对优势的植硅体组合区别于热带稀树草原和亚热带常绿阔叶林等植被类型的植硅体组合,很好地指示了热带森林植被。禾本科植硅体较为敏感地指示了其母本植物的零星存在。随着海拔的升高,某些类型的百分比发生略微的变化,如低地龙脑香林带为球型-木本不规则形态-块状组合;丘陵龙脑香林带为球型-塔型-木本不规则形态组合;石楠林带和山地林带为球型-块状-木本不规则形态组合。这些结果显示了东南亚热带森林中的表土植硅体组合具有一定的植被指示意义。

     

IN THE WAY OF DEVELOPMENT: INDIGENOUS LAND‐RIGHTS ISSUES IN MALAYSIA*

The Malaysian government regards the country's indigenous peoples as “backward” and in need of “modernization.” It aims to assimilate them into the so‐called mainstream society and to incorporate their lands and resources into national and global markets. These policy objectives leave little scope for indigenous groups to pursue their own life projects. Indigenous communities want to share in the benefits of economic development, but they are not prepared to give up their lands, cultures, and identities to obtain them. They have attempted to ward off the negative consequences of development projects by forming advocacy nongovernmental organizations, engaging in various forms of resistance, and seeking redress of their grievances in the courts. Most of all, they want recognition of their rights to land and place. The efficacy of their agency is severely hampered by a battery of repressive laws and by their own political weakness.     

Identification of trends in Malaysian monthly runoff under the scaling hypothesis

Abstract

Statistical tests have been widely used for several decades to identify and test the significance of trends in runoff and other hydrological data. The Mann-Kendall (M-K) trend test is commonly used in trend analysis. The M-K test was originally proposed for random data. Several variations of the M-K test, as well as pre-processing of data for use with it, have been developed and used. The M-K test under the scaling hypothesis has been developed recently. The basic objective of the research presented in this paper is to investigate the trends in Malaysian monthly runoff data. Identification of trends in runoff data is useful for planning water resources projects. Existence of statistically significant trends would also lead to identification of possible effects of climate change. Monthly runoff data for Malaysian rivers from the past three decades are analysed, in both five-year segments and entire data sequences. The five-year segments are analysed to investigate the variability in trends from one segment to another in three steps: (1) the M-K tests are conducted under random and correlation assumptions; (2) the Hurst scaling parameter is estimated and tested for significance; and (3) the M-K test under the scaling hypothesis is conducted. Thus the tests cover both correlation and scaling. The results show that the number of significant segments in Malaysian runoff data would be the same as those found under the assumption that the river flow sequences are random. The results are also the same for entire sequences. Thus, monthly Malaysian runoff data do not have statistically significant trends. Hence there are no indications of climate change in Malaysian runoff data.

Citation Rao, A. R., Azli, M. & Pae, L. J. (2011) Identification of trends in Malaysian monthly runoff under the scaling hypothesis. Hydrol. Sci. J. 56(6), 917–929.     

(In)Formal memoryscapes and the unma(s)king of a Malaysian war heroine

The geographical literature on the politics tied to formal commemorations of the past is a burgeoning one. Yet, there has been less attention paid to similar practices undertaken by nonstate agents seeking to ensure that what is written out of official history is not forgotten. This paper explores how and why the story of Sybil Kathigasu, a woman who played a salient role in the resistance movement against the Japanese during the Second World War in Perak, Malaysia, has been peripheralized within formal memory making even as it has been informally revived elsewhere. It specifically suggests that, while the sidelining of her story may be the product of the tendency of the state of Perak to downplay its war past, Sybil's gender, race and political ideologies have also made it more difficult for her to be embraced as a ‘national’ heroine. Drawing on a private museum that was set up in her honor in Papan, the paper also reveals how factors impeding her formal remembrance also have implications for alternative efforts to recover her story. More broadly, the paper offers insights into women's absences in Malaysian public memory, and argues the need for more emphasis on memoryscapes ‘from below’ as a means of nuancing local remembrance politics.