Effects of in situ habitat quality and landscape characteristics in the oil palm agricultural matrix on tropical understory birds, fruit bats and butterflies

The present study developed methods using remote sensing for estimation of total dry aboveground biomass (AGB) of oil palm in the Congo Basin. To achieve this, stem diameters at breast height (DBH, 1.3 m) and stem heights were measured in an oil palm plantation located in Gabon (Congo Basin, Central Africa). These measurements were used to determine AGB in situ. The remote sensing approach that was used to estimate AGB was textural ordination (FOTO) based upon Fourier transforms that were applied, respectively, to PlanetScope and FORMOSAT-2 satellite images taken from the area. The FOTO method is based on the combined use of two-dimensional (2D) Fast Fourier Transform (FFT) and Principal Component Analysis (PCA). In the context of the present study, it was used to characterize the variation in canopy structure and to estimate the aboveground biomass of mature oil palms. Two types of equations linking FOTO indices to in situ biomass were developed: multiple linear regressions (MLR); and multivariate adaptive spline regressions (MARS). All best models developed yielded significant results, regardless of whether they were derived from PlanetScope or from FORMOSAT-2 images. Coefficients of determination (R2) varied between 0.80 and 0.92 (p ≤ 0.0005); and relative root mean-square-errors (%RMSE) were less than 10.12% in all cases. The best model was obtained using MARS approach with FOTO indices from FORMOSAT-2 (%RMSE = 6.09%).

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Efficacy of Activated Carbon In Situ to Oil Palm Frond Paper for Active Packaging on Mechanical Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.506.607 ◽

2012 ◽

Vol 506 ◽

pp. 607-610 ◽

Cited By ~ 1

Author(s):

N. Thongjun ◽

Lerpong Jarupan ◽

Chiravoot Pechyen

Keyword(s):

Mechanical Properties ◽

Activated Carbon ◽

Moisture Content ◽

Oil Palm ◽

Physical And Mechanical Properties ◽

Active Packaging ◽

Modulus Of Rupture ◽

Oil Palm Frond ◽

Palm Frond

Oil palm frond pulp (OPF) was blended with activated carbon for the purpose of active packaging in this preliminary study. It was aimed to investigate the effect of in-situ activated carbon on physical and mechanical properties of the pulp handsheets made from OPF. Testing of property performances of the resulted handsheets included density, moisture content, thickness swelling, folding, tensile strength, %elongation, stiffness, and modulus of rupture. Ultimately, the intention is to use for prospected active packaging for fresh produce. OPF pulp was prepared by the kraft process. The pulp stock was mixed with different proportions of activated carbon (0, 10, 20, and 30% w/w). The results showed that an increased proportion of activated carbon decreased density and thickness selling, but had no effect on moisture content.

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Aiming for the Optimum: Examining Complex Relationships Between Sampling Regime, Sampling Density and Landscape Complexity to Accurately Model Resource Availability

10.21203/rs.3.rs-1005366/v1 ◽

2021 ◽

Author(s):

Ira L. Parsons ◽

Melanie R. Boudreau ◽

Brandi B. Karisch ◽

Amanda E. Stone ◽

Durham Norman ◽

...

Keyword(s):

Landscape Heterogeneity ◽

Inverse Distance Weighting ◽

Universal Kriging ◽

Systematic Sampling ◽

Sampling Density ◽

Interpolation Methods ◽

Landscape Characteristics ◽

Distance Weighting ◽

Inverse Distance

Abstract Context Obtaining accurate maps of landscape features often requires intensive spatial sampling and interpolation. The data required to generate reliable interpolated maps varies with spatial scale and landscape heterogeneity. However, there has been no rigorous examination of sampling density relative to landscape characteristics and interpolation methods.ObjectivesOur objective was to characterize the 3-way relationship among sampling density, interpolation method, and landscape heterogeneity on interpolation accuracy in simulated and in situ landscapes. MethodsWe simulated landscapes of variable heterogeneity and sampled at increasing densities using both systematic and random strategies. We applied each of three local interpolation methods: Inverse Distance Weighting, Universal Kriging, and Nearest Neighbor — to the sampled data and estimated accuracy (R2) between interpolated surfaces and the original surface. Finally, we applied these analyses to in situ data, using a normalized difference vegetation index raster collected from pasture with various resolutions.Results All interpolation methods and sampling strategies resulted in similar accuracy; however, low heterogeneity yielded the highest R2 values at high sampling densities. In situ results showed that Universal Kriging performed best with systematic sampling, and inverse distance weighting with random sampling. Heterogeneity decreased with resolution, which increased accuracy of all interpolation methods. Landscape heterogeneity had the greatest effect on accuracy.ConclusionsHeterogeneity of the original landscape is the most significant factor in determining the accuracy of interpolated maps. There is a need to create structured tools to aid in determining sampling design most appropriate for interpolation methods across landscapes of various heterogeneity.

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Enhanced Delignification of Oil Palm Empty Fruit Bunch Fibers with in situ Fenton-oxidation

BioResources ◽

10.15376/biores.12.3.5223-5235 ◽

2017 ◽

Vol 12 (3) ◽

Cited By ~ 8

Author(s):

Jude Santanaraj ◽

Mohd Shaiful Sajab ◽

Abdul Wahab Mohammad ◽

Shuhaida Harun ◽

Chin Hua Chia ◽

...

Keyword(s):

Oil Palm ◽

Fenton Oxidation ◽

Empty Fruit Bunch

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SHORT COMMUNICATION: GENOMIC CONSTITUTION OF OIL PALM INTERSPECIFIC HYBRID CROSSES MONITORED BY GENOMIC in situ HYBRIDISATION (GISH)

Journal of Oil Palm Research ◽

10.21894/jopr.2018.0027 ◽

2018 ◽

Cited By ~ 2

Author(s):

MADON M

Keyword(s):

Oil Palm ◽

Interspecific Hybrid ◽

Short Communication ◽

In Situ Hybridisation ◽

Genomic Constitution ◽

Genomic In Situ Hybridisation

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Roadkills in Northern Peninsular Malaysia

Frontiers in Environmental Science ◽

10.3389/fenvs.2021.637462 ◽

2021 ◽

Vol 9 ◽

Author(s):

Tabitha C. Y. Hui ◽

Eleanor M. Slade ◽

Ju Lian Chong

Keyword(s):

Oil Palm ◽

Water Body ◽

Road Network ◽

Agricultural Land ◽

Peninsular Malaysia ◽

Water Bodies ◽

New Developments ◽

Landscape Characteristics ◽

Roadside Vegetation ◽

Species Richness And Abundance

As Malaysia’s economy continues to grow, an ever-expanding road network is being built to support the new developments. Whilst roads increase accessibility to resources and connect human communities, they also bring with them a host of environmental problems such as destruction and fragmentation of habitat, poaching, pollution, and roadkills. Of these, roadkills are the most direct and visible impact of building roads, yet few dedicated studies have been conducted on the extent of roadkills and how to minimize them in Malaysia. In this study, we examined the species richness and abundance of vertebrate roadkills along eight one-km stretches (two in each habitat) of highways in Terengganu and Pahang across four habitat types: rainforest, oil palm plantation, subsistence agricultural land, and village. Each stretch of highway was surveyed by walking it six times between May to October 2017 for the Terengganu segments and May to October 2018 for the Pahang segments. A total of 305 roadkilled animals were recorded, consisting of at least 24 species. Three of these are protected by Malaysian law. The most common roadkilled animals were frogs (102 individuals) followed by birds (70 individuals), mammals (67 individuals) and reptiles (66 individuals). The highest number of roadkills were recorded in roads going through villages (112 individuals), followed by oil palm plantations (81 individuals), forests (65 individuals) and subsistence agricultural land (47 individuals). For every roadkill we also recorded the location’s specific habitat and landscape characteristics such as distance to the nearest fruit tree, tree, shrub, water body, human structure, and overhead cable. Most roadkills were found close to vegetation cover and water bodies. However, we found that roadkills decreased to near zero between 30 and 80 m from the nearest shrub or tree. Roadkills decreased over larger distances from the nearest water body, but in oil palm and village habitats, reducing water bodies within 20–50 m from a road would almost half the number of roadkills. We suggest that making changes to the structure and composition of roadside vegetation and other landscape features, such as thinning vegetation to discourage wildlife from gathering near roads, could significantly reduce the number of roadkills.

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Chromosome identification in oil palm (Elaeis guineensis) using in situ hybridization with massive pools of single copy oligonucleotides and transferability across Arecaceae species

Chromosome Research ◽

10.1007/s10577-021-09675-0 ◽

2021 ◽

Author(s):

Noorhariza Mohd Zaki ◽

Trude Schwarzacher ◽

Rajinder Singh ◽

Maria Madon ◽

Corey Wischmeyer ◽

...

Keyword(s):

In Situ Hybridization ◽

Oil Palm ◽

Elaeis Guineensis ◽

Single Copy ◽

Chromosome Identification

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In Situ Effects of Shoreline Type and Watershed Land Use on Submerged Aquatic Vegetation Habitat Quality in the Chesapeake and Mid-Atlantic Coastal Bays

Estuaries and Coasts ◽

10.1007/s12237-017-0316-0 ◽

2017 ◽

Vol 41 (S1) ◽

pp. 101-113 ◽

Cited By ~ 3

Author(s):

J. Brooke Landry ◽

Rebecca R. Golden

Keyword(s):

Land Use ◽

Habitat Quality ◽

Submerged Aquatic Vegetation ◽

Aquatic Vegetation ◽

Population Pressure ◽

Watershed Land Use ◽

Coastal Bays ◽

Shoreline Hardening ◽

Atlantic Coastal

Abstract Submerged aquatic vegetation (SAV) is an ecologically and economically valuable component of coastal estuaries that acts as an early indicator of both degrading and improving water quality. This study aimed to determine if shoreline hardening, which is associated with increased population pressure and climate change, acts to degrade SAV habitat quality at the local scale. In situ comparisons of SAV beds adjacent to both natural and hardened shorelines in 24 subestuaries throughout the Chesapeake and Mid-Atlantic Coastal Bays indicated that shoreline hardening does impact adjacent SAV beds. Species diversity, evenness, and percent cover were significantly reduced in the presence of riprap revetment. A post hoc analysis also confirmed that SAV is locally affected by watershed land use associated with increased population pressure, though to a lesser degree than impacts observed from shoreline armoring. When observed over time, SAV recovery at the local level took approximately 3 to 4 years following storm impacts, and SAV adjacent to natural shorelines showed more resilience to storms than SAV adjacent to armored shorelines. The negative impacts of shoreline hardening and watershed development on SAV shown here will inform coastal zone management decisions as increasing coastal populations and sea level rise drive these practices.

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