Effect of prey availability on the abundance of White-breasted Wood-Wrens, insectivorous birds of tropical lowland forests

2014 ◽  
Vol 85 (4) ◽  
pp. 347-354 ◽  
Author(s):  
Natalie V. Sánchez ◽  
Luis E. Vargas-Castro ◽  
Gerardo Avalos ◽  
Federico Paniagua
Keyword(s):  
Prey Availability ◽  
Insectivorous Birds ◽  
Tropical Lowland ◽  
Lowland Forests

The dynamics of prey selection by the trap-building predator Gasteracantha hasselti

2020 ◽  
Vol 36 (3) ◽  
pp. 87-93
Author(s):  
Radek Michalko ◽  
Ondřej Košulič ◽  
Venus Saksongmuang ◽  
Prasit Wongprom ◽  
Prapinya Siripaiboon ◽  
...  
Keyword(s):  
Prey Availability ◽  
Prey Selection ◽  
Prey Type ◽  
Generalist Predators ◽  
Dynamic Component ◽  
Tropical Lowland ◽  
North Eastern ◽  
Lowland Forests ◽  
Dynamic Components ◽  
Relative Selectivity

AbstractPrey selection by generalist predators can be highly dynamic depending on the prey community structure. However, the dynamics of prey selection at the stage of prey entrapping are rarely investigated in trap-building predators, probably because their traps have been previously considered to intercept mobile prey proportionally to its availability in environment. Here we investigated the dynamics of prey selection by the orb-weaving spider Gasteracantha hasselti (Araneidae) depending on the composition of the available prey in tropical lowland forests located in north-eastern Thailand. We found that Gasteracantha captured a wide variety of prey but selected, on average, mostly Coleoptera and Diptera. The selectivity of Gasteracantha’s webs for Coleoptera was constant across the changes in overall prey availability and prey composition. The web selectivity for Hemiptera decreased rapidly with increasing relative densities of Hemiptera in the environment. The selectivity for Diptera and Hymenoptera increased and decreased, respectively, with their absolute densities in the environment. The relative selectivity of Gasteracantha’s traps for a particular prey type was driven by the presence and density of the highly selected prey rather than overall prey density. The results show that the selectivity of Gasteracantha’s traps for prey had both fixed and dynamic components and the dynamic component was determined by the relative as well as absolute densities of the particular prey types in the environment.

Causes and Consequences of Monodominance in Tropical Lowland Forests

2001 ◽  
Vol 157 (2) ◽  
pp. 141
Author(s):  
Torti ◽  
Coley ◽  
Kursar
Keyword(s):  
Tropical Lowland ◽  
Lowland Forests

scholarly journals Land Cover and Forest Type Classification by Values of Vegetation Indices and Forest Structure of Tropical Lowland Forests in Central Vietnam

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Hung Nguyen Trong ◽  
The Dung Nguyen ◽  
Martin Kappas
Keyword(s):  
Land Cover ◽  
Vegetation Index ◽  
Forest Type ◽  
Vegetation Indices ◽  
Landsat 8 ◽  
Tropical Lowland ◽  
Central Vietnam ◽  
Lowland Forests ◽  
Type Classification ◽  
Sentinel 2

This paper aims to (i) optimize the application of multiple bands of satellite images for land cover classification by using random forest algorithms and (ii) assess correlations and regression of vegetation indices of a better-performed land cover classification image with vertical and horizontal structures of tropical lowland forests in Central Vietnam. In this study, we used Sentinel-2 and Landsat-8 to classify seven land cover classes of which three forest types were substratified as undisturbed, low disturbed, and disturbed forests where forest inventory of 90 plots, as ground-truth, was randomly sampled to measure forest tree parameters. A total of 3226 training points were sampled on seven land cover types. The performance of Landsat-8 showed out-of-bag error of 31.6%, overall accuracy of 68%, kappa of 67.5%, while Sentinel-2 showed out-of-bag error of 14.3% and overall accuracy of 85.7% and kappa of 83%. Ten vegetation indices of the better-performed image were extracted to find out (i) the correlation and regression of horizontal and vertical structures of trees and (ii) assess the variation values between ground-truthing plots and training sample plots in three forest types. The result of the t test on vegetation indices showed that six out of ten vegetation indices were significant at p<0.05. Seven vegetation indices had a correlation with the horizontal structure, but four vegetation indices, namely, Enhanced Vegetation Index, Perpendicular Vegetation Index, Difference Vegetation Index, and Transformed Normalized Difference Vegetation Index, had better correlations r = 0.66, 0.65, 0.65, 0.63 and regression results were of R2 = 0.44, 0.43, 0.43, and 0.40, respectively. The correlations of tree height were r = 0.46, 0.43, 0.43, and 0.49 and its regressions were of R2 = 0.21, 0.19, 0.18, and 0.24, respectively. The results show the possibility of using random forest algorithm with Sentinel-2 in forest type classification in line with vegetation indices application.

scholarly journals Carbon and nitrogen stocks in dead wood of tropical lowland forests as dependent on wood decay stages and land-use intensity

2016 ◽  
Vol 59 (2) ◽  
Author(s):  
Selis Meriem ◽  
Soekisman Tjitrosoedirjo ◽  
Martyna Malgorzata Kotowska ◽  
Dietrich Hertel ◽  
Triadiati Triadiati
Keyword(s):  
Land Use ◽  
Dead Wood ◽  
Wood Decay ◽  
Land Use Intensity ◽  
Carbon And Nitrogen ◽  
Tropical Lowland ◽  
Lowland Forests ◽  
Carbon And Nitrogen Stocks

STILASI BURUNG LUNTUR KASUMBA DENGAN TEKNIK DIGITAL PRINTING PADA BUSANA READY TO-WEAR

2021 ◽  
Vol 5 (1) ◽  
pp. 34
Author(s):  
Siti Khurriyatunnisa Rahayu ◽  
Katiah Katiah
Keyword(s):  
Bird Species ◽  
Digital Printing ◽  
The Public ◽  
Tropical Lowland ◽  
Fashion Products ◽  
The World ◽  
Lowland Forests ◽  
Printing Techniques ◽  
Scientific Name ◽  
Made In

Luntur Kasumba (Red-naped Trogon) is a species of bird belonging to the order Trogonidae with the scientific name Harpactes Kasumba which is scattered in the tropical lowland forests of the Great Sunda namely Sumatera, Java, and Kalimantan at an altitude of less than 600 meters above sea level. The source of ideas for making fashion products which are then examined and made in the form of this article comes from the Luntur Kasumba bird which is transformed into a stilation motif and the stylation motif that has been made is applied to textiles using digital printing techniques. The purpose of making articles from the results of the analysis of this fashion product is to elevate the beauty of the Luntur Kasumba bird which is applied to the world of fashion and informed the public in making ready-to-wear clothing, which is further analyzed from the scientific side of the fashion field. The benefit of designing this work is to enhance and develop the writer's creativity in designing fashion by applying the bird stylation of Luntur Kasumba using digital printing techniques and making articles from the analysis of fashion products. The method used in writing the results of the analysis of this fashion product research is Practic-Led Research, which is intended to practice the stapling technique of the Kasunt Luntur bird motif, applying the design of the stylation motif to textiles using digital printing techniques, and is realized in the form of clothing with the addition of fringes as decorative trims. Ready to-Wear clothing made with digital printing techniques with the stylized motif of the Kasumba faded bird is an innovation in preserving the bird species of Indonesia's natural wealth into the world of Fashion. Keywords: Stilation, Luntur Kasumba Bird, Ready to-Wear, Fringes Abstrak Luntur Kasumba (Red-naped Trogon) adalah jenis burung yang tergolong  kedalam ordo Trogonidae dengan nama ilmiah Harpactes Kasumba yang tersebar di hutan dataran rendah tropis Sunda Besar yaitu Sumatera, Jawa, dan Kalimantan pada ketinggian kurang dari 600 meter dari permukaan laut. Sumber ide pembuatan produk busana yang kemudian diteliti dan dibuat dalam bentuk artikel ini berasal dari burung Luntur Kasumba yang diwujudkan menjadi motif stilasi dan motif stilasi yang telah dibuat diaplikasikan pada tekstil menggunakan teknik digital printing. Tujuan pembuatan artikel dari hasil analisis produk busana ini adalah untuk mengangkat keindahan burung Luntur Kasumba yang diterapkan pada dunia fashion dan diinformasikan kepada masyarakat pada pembuatan busana ready to-wear, yang selanjutkan di analisis dari sisi keilmuan bidang busana. Manfaat perancangan karya ini adalah untuk meningkatkan dan mengembangkan kreativitas penulis dalam merancang busana dengan menerapkan stilasi burung Luntur Kasumba mengguanakan teknik digital printing dan membuat artikel dari hasil analisis produk busana. Metode yang digunakan dalam penulisan hasil analisis  dari penelitian produk busana ini yaitu Practic-Led Research, yang dimaksudkan untuk mempraktikan teknik stilasi motif burung Luntur Kasumba, mengaplikasikan desain motif stilasi tersebut pada tekstil menggunakan teknik digital printing, dan diwujudkan dalam bentuk busana dengan penambahan fringes sebagai decorative trims. Busana Ready to-Wear yang dibuat dengan Teknik digital printing dengan motif stilasi burung luntur kasumba merupakan suatu inovasi di dalam melestarikan jenis burung kekayaan alam Indonesia ke dalam dunia Fashion.   Kata Kunci: Stilasi, Burung Luntur Kasumba, Ready to-Wear, Fringes

Underestimated and cryptic diversification patterns across Afro-tropical lowland forests

2019 ◽  
Vol 46 (2) ◽  
pp. 381-391 ◽  
Author(s):  
Jerry W. Huntley ◽  
Katrina D. Keith ◽  
Adrian A. Castellanos ◽  
Lukas J. Musher ◽  
Gary Voelker
Keyword(s):  
Tropical Lowland ◽  
Lowland Forests
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