Abundance,breeding and growth of the ocypodid crab Dotilla myctiroides (Milne-Edwards) on a West Malaysian beach     

A.J. Hails  S. Yaziz 《Estuarine, Coastal and Shelf Science》1982,15(2):229-239

The ocypodid crab, Dotilla myctiroides, was studied on the south-west coast of peninsular Malaysia. The mean numbers and biomass over a year along a transect from high to low water ranged from 37·5 to 579 crabs m^?2 and from 2·22 to 50·79 g m^?2 (wet weight) respectively. Berried females were found in all months of the year but two peaks of activity were apparent, from November to February and May to July. It is suggested that this may be related to changes in food abundance associated with the effects of monsoon winds on sea currents. Laboratory growth studies indicated that maximum life span was approximately 13 months (from first crab stage) for males and 10 months for females. Growth rate decreased with increasing size of crab. Egg number increased with size of female.  相似文献   

An annual cycle of recruitment,growth and production in a Malaysian population of the trochacean gastropod Umbonium vestiarium (L.)     

A.J. Berry  Zamri bin Othman 《Estuarine, Coastal and Shelf Science》1983,17(3):357-363

From July 1981 to July 1982 Umbonium vestiarium (L.) on a north Penang sand shore numbered 573–11 077 m^?2 (mean 4126 or 53·1 g dry tissue) near MLWN and 2164–12 414 m^?2 (mean 6500 or 59·8 g dry tissue) further downshore. Heavy recruitment of young became evident in June and July 1982 and a closely corresponding cohort of young was present in July 1981. Progression of this cohort indicated that young settling in May–June grew to full size (11–13 mm diameter) by January–March the following year and that virtually all died during their second year, presumably having spawned in March–May. Recruitment of young was chiefly on the lower shore but adults came to be more abundant and predominant on the upper shore. There is some evidence of migration upshore during growth.Production is estimated at 105·4 g dry tissue m^?2 y^?1 (2118 kj) at the lower shore level and this is almost double the 58·8 g m^?2 y^?1 (1176·6 kj) at the higher level. These values represent almost the entire secondary production across much of the sand flats.Possible causes of such a marked annual cycle in the very weakly seasonal tropics of the Malacca Strait are considered and it is suggested that monsoonal changes in wind, wave action and salinity might be involved.  相似文献   

Basaltic dykes of the Eastern Belt of Peninsular Malaysia: The effects of the difference in crustal thickness of Sibumasu and Indochina     

《Journal of Asian Earth Sciences》2013

Basaltic dykes of Peninsular Malaysia are confined to the Eastern Belt (Indochina/East Malaya block) as compared with the Western Belt (Sibumasu Block). The dyke intruded through a crustal fracture formed by stress developed from the evolution of two offshore basins (Malay and Penyu basins) east of Peninsular Malaysia. The Ar–Ar dating from the present study combined with the previous geochronological data indicate that the ages of dykes range from 79 ± 2 Ma to 179 ± 2 Ma. Thus it is difficult to correlate the dykes with the closure of Tethys during Permo-Triassic time because of the younger age of the dykes. The majority of the dykes exposed in the Eastern Belt may have been attributed to the difference of crustal thickness between the Eastern and Western belt of Peninsular Malaysia. A thicker Western Belt crust (13 km more than both Eastern and Central belts) is difficult to rupture with normal plate tectonic stress and therefore serves to contain the rise of a mantle derived melt. The chemistry indicates the basalts are olivine to quartz normative and are of the continental within-plate category.  相似文献   

Coupling of remote sensing data and environmental-related parameters for dengue transmission risk assessment in Subang Jaya,Malaysia     

Nazri Che Dom  Abu Hassan Ahmad  Zulkiflee Abd Latif  Rodziah Ismail 《国际地球制图》2013,28(3):258-272

In Malaysia, the endemic level of dengue fever (DF) has already changed morbidity indicators, and the magnitude of these incidences in the last few years has surpassed the incidences of all other diseases of compulsory notification. The reasons for the dramatic emergence of DF are complex and not well understood. There are many factors that contribute to the epidemiological conditions that favour viral transmission by the main mosquito vector. This study, therefore, is filling this gap by analysing the impact of dengue incidence at a local (Subang Jaya) scale using environmental factors. Meteorological data and land-use pattern were consolidated using geographic information system (GIS) and its components as an analytical tool. We have shown that weather variables (relative humidity, temperature and precipitation) have significant correlation with DF incidence with seasonal variation. Besides land-use pattern, DF incidence shows the higher distribution in the residential area, followed by commercial and industrial area. This is due to the higher population density in residential area as well as favourable places for the breeding of dengue-carrying Aedes mosquitos created by humans in the residential area, especially one-storey houses. The analysis on the trends of DF incidence towards various housing types indicate that most of the victims’ houses fall into interconnection houses and mixed houses types compared to the independent houses area. The outcome driven from this analysis suggested that each character of the environmental factors has their own risk towards dengue incidence. In line with that, it is possible to develop a dynamic model of DF transmission using the knowledge produced by this comprehensive time series data and the results provided by the different analyses.  相似文献   

The Distribution of Riparian Corridor Plants and the Relations to River Water Salinity along Perai River, Penang, Malaysia     

Johan Ismail  Mashhor Mansor 《湿地科学》2010,8(1)

Ecological surveys were carried out to investigate the distribution and characterization of riparian corridor plants along the Perai River,Penang,Malaysia from July 2007 to March 2008.Surveys were design to represent horizon-tal sections of the river starting from the river mouth towards the upper reaches for 20 km.A total of 84 species of plants from 30 families were recorded.They consisted of 28 species of standing plants(plants with height of more than 1 m)and 56 species of weedy plants(plants with heigh...  相似文献   

Urban geography as pretext: Sociocultural landscapes of Kuala Lumpur in independent Malaysian films   总被引：1，自引：1，他引：0  

Khoo Gaik Cheng 《Singapore journal of tropical geography》2008,29(1):34-54

Current independent filmmaking in Malaysia has the potential to be an alternative and viable space for creative and political expression, relative to mainstream national cinema (Malay cinema) and to the state. I focus on alternative imagery and sociocultural mappings of Kuala Lumpur in three ‘indie’ films. All three films contain documentary elements capturing social geographies of the city not represented in mainstream Malay cinema, or even if represented not subjected to a critical gaze by the filmmaker. The Big Durian centres on the perspectives of the city's urban middle class of all ethnicities; Bukak Api portrays the daily struggles of Malay transsexual sex workers in Chow Kit, a predominantly working‐class Chinese neighbourhood and red light district; and 18? highlights the opinions of the nongovernmental organization community, bohemians, artists, anarchists and media activists mostly in the cosmopolitan suburb of Bangsar. These representations of the Malaysian urban landscape are pretexts for and politicize the national landscape through a discussion of ethnicity and race politics, sexuality, and the lack of space for freedom of creative expression and critical thinking.  相似文献   

U/Th dating of the travertine deposited at transfer zone between two normal faults and their neotectonic significance: Cambazli fissure ridge travertines (the Gediz Graben-Turkey)     

《Geodinamica Acta》2013,26(2):95-105

Abstract

The neotectonic characteristics of the travertines that outcrop near Cambazli Village to the west of the Gediz Graben in the Western Anatolia and the age determination of the travertine were carried out using the ²³⁰Th/^234,238U disequilibrium method. The Cambazli fissure ridge travertines represent the travertine depositions that develop at a transfer zone. The extent of these travertines is at NW-SE and NE-SW orientations and the ridge crest-trend of these travertines range between approximately 55° and 82° and they are located at an intersecting position. The evaluation of the fissure ridge travertine directions indicated that the compression stress that was responsible for the deposition of the Cambazli travertine was determined to be in the N-S orientation and the extensional stress was determined to be in the E-W orientation. The orientation of the dominant extension in Western Anatolia during the neotectonic period was N-S and this orientation is not in accordance with the directions of stress for the travertines. This situation indicates that the travertines were deposited along a transfer zone in N10W orientation between two normal faults. The travertines were determined to be active since the Upper Pleistocene as indicated by the age determination conducted using the ²³⁰Th/^234,238U disequilibrium method. The dilation rate of the travertines during dilation and the post-dilation period and the average dilation rate of the Cambazli travertines to the north of the Gediz Graben were calculated as 0.01–0.02 mm yr^?1 during deposition and as 0.05 mm yr^?1 during the post-dilation period. These dilation rates indicate lower tectonic activity along the northern ridge of the Gediz Graben than along the southern ridge.

© 2011 Lavoisier SAS. All rights reserved  相似文献   

Enclaves and ethnic ties: The local impacts of Singaporean cross‐border tourism in Malaysia and Indonesia     

Mark P. Hampton 《Singapore journal of tropical geography》2010,31(2):239-253

Cross‐border tourism is often proposed by governments as an incentive for economic growth, but critics have suggested that its impacts are, in fact, overplayed. This paper presents research in the Indonesia‐Malaysia‐Singapore Growth Triangle (IMS‐GT). It examines the broad economic impacts of Singaporean cross‐border tourism on local host communities in two locations: Kukup, a traditional Malaysian fishing village in Johor, southern Peninsular Malaysia, and Bintan in Riau Islands Province in western Indonesia. The study found that cross‐border tourism generated income, employment and some local economic linkages. In Kukup clear economic benefits with increased income and employment were unevenly distributed between ethnic groups. The Bintan enclave development had some linkages to the island economy but was reliant on immigrant labour. Cross‐border ethnic ties, particularly Chinese, also played an important role in the growth of tourism in the IMS‐GT. The paper shows that cross‐border tourism can be a useful addition to more conventional forms of international tourism within national tourism planning and could lead to significant economic benefits for local communities.  相似文献   

Human health risk of polycyclic aromatic hydrocarbons from consumption of blood cockle and exposure to contaminated sediments and water along the Klang Strait,Malaysia     

《Marine pollution bulletin》2014,85(1-2):268-279

The concentration of carcinogenic poly aromatic hydrocarbons (c-PAHs) present in water and sediment of Klang Strait as well as in the edible tissue of blood cockle (Anadara granosa) was investigated.The human health risk of c-PAHs was assessed in accordance with the standards of the United States Environmental Protection Agency (US EPA). The cancer risks of c-PAHs to human are expected to occur through the consumption of blood cockles or via gastrointestinal exposure to polluted sediments and water in Kalng Strait. The non-carcinogenic risks that are associated with multiple pathways based on ingestion rate and contact rates with water were higher than the US EPA safe level at almost all stations, but the non-carcinogenic risks for eating blood cockle was below the level of US EPA concern. A high correlation between concentrations of c-PAHs in different matrices showed that the bioaccumulation of c-PAHs by blood cockles could be regarded as a potential health hazard for the consumers.  相似文献   

A review on 3D terrain visualization of GIS data: techniques and software     

Che Mat RUZINOOR  Abdul Rashid Mohamed SHARIFF  Biswajeet PRADHAN  Mahmud RODZI AHMAD  Mohd Shafry Mohd RAHIM 《地球空间信息科学学报》2012,15(2):105-115

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