We found 6 data for "FAKULTI PERHUTANAN"

LIST DATASET

NO. DATASET TITLE
1.
GENETIC STRUCTURES ACROSS A BIOGEOGRAPHICAL BARRIER REFLECT DISPERSAL POTENTIAL OF FOUR SOUTHEAST ASIAN MANGROVE PLANT SPECIES
DESCRIPTION : Aim Biogeographic barriers restrict the movement of individuals, resulting in population divergence, genetic differentiation, endemism and speciation. Yet, some barriers demonstrate unequal effect across species depending on species dispersal, which manifests in varying genetic structure. We test the hypotheses that the genetic structure of four coastal mangrove species would reflect differences in dispersal potential across the Malay Peninsula, a major biogeographic barrier in the Indo-West Pacific region. Location Twelve sites from the east and west coasts of the Malay Peninsula. Taxon Mangrove trees Avicennia alba, Sonneratia alba, Bruguiera gymnorhiza, and Rhizhophora mucronata. Methods For each species, we characterized genetic structure and gene flow using seven to 12 species-specific nuclear microsatellite markers. We tested for east-west genetic differentiation across the peninsula, a stepping-stone migration pattern, and assessed the proportion of recent dispersal and direction of historical migration along the Malacca Strait. Results Significant east-west genetic differentiation across the peninsula was observed in A. alba, S. alba and B. gymnorhiza, and the effect was most pronounced for the two species with lower dispersal potential (A. alba, S. alba). In contrast, the two species with higher dispersal potential (B. gymnorhiza and R. mucronata) exhibited much higher proportion of recent inter-population migration along the Malacca Strait. The signature of historical colonization from refugia in the Andaman Sea (north-to-south migration along the Malacca Strait) predominated for A. alba and S. alba. Historical south-north migration predominated for R. mucronata and B. gymnorhiza. Main conclusions This study is the first to implicate dispersal potential as a causal factor of varying mangrove species genetic structure across a biogeographic barrier. The Malay Peninsula functions as a filter to gene flow rather than a barrier. The genetic structure in mangrove species with a higher dispersal potential is more congruent with contemporary gene flow while that of species with a lower dispersal potential reflects historical processes.Our findings hint at the role of dispersal potential as a predictor of gene flow in mangroves.
CONTRIBUTOR : MOHD NAZRE BIN SALEH @ JAPRI (11/05/2023 11:57 AM)
FACULTY : FAKULTI PERHUTANAN
PUBLICATION : 0 ; FILE IN : HDFS 
HAS VIEWS : 2057 ; FOLDER IN PROJECT : 1 ; FILE IN PROJECT : 1 ; DOWNLOAD : 0 ;
KEYWORD : [Genetic connectivity isolation] , [ mangrove trees] , [ propagule stepping-stone migration]
2.
DATA FROM: PREDATION OF POTENTIAL INSECT PESTS IN OIL PALM PLANTATIONS, RUBBER TREE PLANTATIONS AND FRUIT ORCHARDS
DESCRIPTION : In human-modified landscapes, important ecological functions such as predation are negatively affected by anthropogenic activities, including the use of pesticides and habitat degradation. Predation of insect pests is an indicator of healthy ecosystem functioning, which provides important ecosystem services, especially for agricultural systems. In this study, we compare predation attempts from arthropods, mammals, and birds on artificial caterpillars in the understory, between three tropical agricultural land-use types: oil palm plantations, rubber tree plantations, and fruit orchards. We collected a range of local and landscape-scale data including: undergrowth vegetation structure; elevation; proximity to forest; and canopy cover in order to understand how environmental variables can affect predation. In all three land-use types, our results showed that arthropods and mammals were important predators of artificial caterpillars and there was little predation by birds. We did not find any effect of the environmental variables on predation. There was an interactive effect between land-use type and predator type. Predation by mammals was considerably higher in fruit orchards and rubber tree than in oil palm plantations, likely due to their ability to support higher abundances of insectivorous mammals. In order to maintain or enhance natural pest-control in these common tropical agricultural land-use types, management practices that benefit insectivorous animals should be introduced, such as the reduction of pesticides, improvement of understory vegetation and local and landscape heterogeneity.
CONTRIBUTOR : BADRUL AZHAR BIN MD SHARIF (11/05/2023 11:42 AM)
FACULTY : FAKULTI PERHUTANAN
PUBLICATION : 0 ; FILE IN : HDFS 
HAS VIEWS : 3076 ; FOLDER IN PROJECT : 1 ; FILE IN PROJECT : 1 ; DOWNLOAD : 2 ;
KEYWORD : [insect pest] , [ plantation] , [ fruit orchard]
3.
APPLICATION STRATEGIES BY SELECTIVE MEDIUM TREATED WITH ENTOMOPATHOGENIC BACTERIA SERRATIA MARCESCENS AND PSEUDOMONAS AERUGINOSA AS POTENTIAL BIOCONTROL AGAINST COPTOTERMES CURVIGNATHUS
DESCRIPTION : The success of microbial termiticides in controlling termites depends on the ability of microbes to grow in different medium and the functionality of the microbes as a resistant barrier or toxic bait. This study was conducted to understand the mortality rate and behaviour changes of subterranean termite (Coptotermes curvignathus Holmgren) introduced with different concentrations of Serratia marcescens strain LGMS 1 and Pseudomonas aeruginosa strain LGMS 3 using wood and soil as bacterial transfer medium. In general, higher concentration of bacteria in soil caused reduction in tunnelling activity, wood consumption and an increased in mortality. However, application on wood revealed a different outcome. Wood treated with S. marcescens of 106 CFU/mL concentration proved to be more efficient as bait than higher concentration applications as it caused high mortality rate while still highly palatable for termites. Wood or soil treated with S. marcescens concentration higher than 109 CFU/mL creates a high toxicity and repellent barrier for termites. P. aeruginosa of 109 CFU/mL concentrations applied on wood served as a slow-acting toxic bait. However, the ability for S. marcescens and P. aeruginosa to survive on wood are low which caused the bait unable to retain a useful level of toxicity for a long period of time and frequent reapplication is needed.
CONTRIBUTOR : CHIN KIT LING (11/05/2023 11:16 AM)
FACULTY : FAKULTI PERHUTANAN
PUBLICATION : 0 ; FILE IN : HDFS 
HAS VIEWS : 2210 ; FOLDER IN PROJECT : 1 ; FILE IN PROJECT : 1 ; DOWNLOAD : 0 ;
KEYWORD : [Coptotermes curvignathus] , [ Serratia marcescens] , [ Pseudomonas aeruginosa] , [ Bacterial transfermedium] , [ Application strategies]
4.
MEASUREMENTS OF RIVER BED GRAVEL SAMPLES FROM THE SABETO RIVER, FIJI
DESCRIPTION : Bedload gravels were collected from seven stations along the length of the Sabeto River of western Viti Levu, Fiji. The Sabeto River is an active, bedload transporting, gravel-bed system (Gale et al., 2019). Sampling was confined to clasts of the distinctive and isotropic Navilawa Monzonite, an intrusive rock that crops out only along the upper reaches of the river (Rao, 1983; Hathway, 1993). The river has entrenched the Navilawa Monzonite outcrop resulting in the direct supply of monzonite gravels to the fluvial system. Bedload gravels were collected along transects at seven stations (1 to 7) over a distance of 9.7 km. One of the sampling sites was located above the downstream boundary of the monzonite outcrop, the rest below. In addition, samples of fresh Navilawa Monzonite undergoing active physical breakdown were collected from alongside the bedrock channel at Station 0. The shape of these clasts provides us with the opportunity of observing the nature of the precursor particles as they are liberated from the rock and before they experience fluvial modification. The density of the fresh Navilawa Monzonite was estimated. A total of 883 particles, ranging in diameter (b-axis) from 12 to 337 mm, was collected. The long (a), intermediate (b) and short (c) axis of each particle was measured, along with the diameter of the sharpest corner of the maximum projection outline (Di) and the diameter of the maximum inscribed circle (Dk). At six of the stations, the mass of each particle was recorded. The dataset includes calculations of the Modified Wentworth Roundness, Maximum Projection Sphericity and Oblate–Prolate Index of each clast. At six of the stations the volume of each particle was estimated using measurements of particle mass and the density of the fresh Navilawa Monzonite.
CONTRIBUTOR : ZELINA BINTI ZAITON IBRAHIM (11/05/2023 10:28 AM)
FACULTY : FAKULTI PERHUTANAN
PUBLICATION : 0 ; FILE IN : HDFS 
HAS VIEWS : 1892 ; FOLDER IN PROJECT : 1 ; FILE IN PROJECT : 2 ; DOWNLOAD : 0 ;
KEYWORD : [Bedload gravels] , [ Sabeto River] , [ Fluvial system]
5.
HABITAT FRAGMENTATION AND LOGGING AFFECTS THE OCCURRENCE OF THE LESSER MOUSE DEER IN TROPICAL FOREST RESERVES
DESCRIPTION : Due to rapid urbanization, logging, and agricultural expansion, forest fragmentation is negatively affecting native wildlife populations throughout the tropics. This study examined the effects of landscape and habitat characteristics on the lesser mouse deer, Tragulus kanchil, populations in Peninsular Malaysia. A total of 315 camera traps were deployed in eight forest reserves. This study provides critical ecological information for managing and conserving understudied populations of T. kanchil. We found that the detection of T. kanchil was attributed to forest fragmentation. Forest patches had the detection of T. kanchil four times greater than continuous forests. The detection of T. kanchil was nearly three times higher in the peat swamp forest compared to the lowland dipterocarp forests. Surprisingly, the detection of T. kanchil was almost twice lower in the unlogged forests compared to logged forests. The detection of T. kanchil increased with the presence of trees, particularly those with DBH of 5 cm to 45 cm, canopy cover, number of saplings and palms, number of dead fallen trees, and distance from nearest roads. However, detection decreased with a greater number of trees with a DBH greater than 45 cm and higher elevation. We recommend that conservation stakeholders take the necessary steps to support the conservation of mouse deer species and its natural habitats regardless of whether these forests are fragmented or continuous. These steps include eradicating poaching, habitat degradation, and further deforestation.
CONTRIBUTOR : BADRUL AZHAR BIN MD SHARIF (11/05/2023 09:45 AM)
FACULTY : FAKULTI PERHUTANAN
PUBLICATION : 0 ; FILE IN : HDFS 
HAS VIEWS : 739 ; FOLDER IN PROJECT : 1 ; FILE IN PROJECT : 1 ; DOWNLOAD : 0 ;
KEYWORD : [Habitat] , [ Forest fragmentation] , [ Forest reserves]
6.
HIGHER MORTALITY RATES FOR LARGE AND MEDIUM-SIZED MAMMALS ON PLANTATION ROADS COMPARED TO HIGHWAYS IN PENINSULAR MALAYSIA
DESCRIPTION : The fragmentation of forests by agricultural expansion, urbanisation and road networks is a global phenomenon. In Southeast Asia, wildlife populations are being isolated into pockets of natural habitat surrounded by road networks and monoculture plantations. Mortality by wildlife-vehicle collisions (WVCs) is causing a decline in many species of conservation priority in human-modified landscapes. This study is the first in Malaysia to investigate factors affecting the occurrence of WVCs. We assessed roadkill data gathered by the Department of Wildlife and National Parks on small, medium and large mammals in Peninsular Malaysia. We examined the relationship between wildlife road accidents and environmental factors. We found a total of 605 roadkills, involving 21 species. Roadkill records included three species classified as endangered. Road type, year, and distance from continuous and fragmented forests were significant for determining mammal mortality. Unexpectedly, the majority of road mortality occurred on oil palm plantation roads compared to highways. Mortality of small and medium mammals was greater at locations further away from continuous forest than those closer to forests. Segmentation of continuous forest by roads should be avoided wherever possible, and wildlife corridors should be put in place to reduce the threat of roads on crossing wildlife.
CONTRIBUTOR : BADRUL AZHAR BIN MD SHARIF (11/05/2023 09:19 AM)
FACULTY : FAKULTI PERHUTANAN
PUBLICATION : 0 ; FILE IN : HDFS 
HAS VIEWS : 1082 ; FOLDER IN PROJECT : 1 ; FILE IN PROJECT : 1 ; DOWNLOAD : 3 ;
KEYWORD : [mammals] , [ plantation ]