scholarly journals Mapping Pure Mangrove Patches in Small Corridors and Sandbanks Using Airborne Hyperspectral Imagery

2019 ◽  
Vol 11 (5) ◽  
pp. 592 ◽  
Author(s):  
Cheng-Chien Liu ◽  
Tsai-Wen Hsu ◽  
Hui-Lin Wen ◽  
Kung-Hwa Wang
Keyword(s):  
Hyperspectral Imagery ◽  
Single Species ◽  
Field Investigation ◽  
Mangrove Species ◽  
Remarkable Feature ◽  
Analysis Technique ◽  
Geographical Position ◽  
Abundance And Distribution ◽  
Compact Airborne Spectrographic Imager ◽  
Mangrove Trees

Taijiang National Park (TNP) of Taiwan is the northernmost geographical position of mangrove habitats in the Northern Hemisphere. Instead of occupying a vast region with a single species, the mangroves in TNP are usually mingled with other plants in a narrow corridor along the water or in groups on a small sandbank. The multi-spectral images acquired from the spaceborne platforms are therefore limited in mapping the abundance and distribution of the mangrove species in TNP. We report the work of mapping pure mangrove patches in small corridors and sandbanks in TNP using airborne Compact Airborne Spectrographic Imager (CASI) hyperspectral imagery. Bu considering the similarity of spectral reflectance among three species of mangrove and other plants, we followed the concept of supervised classification to select a few training areas with known mangrove trees, where the training areas are determined from the detailed map of mangrove distribution derived from the field investigation. The Hourglass hyperspectral analysis technique was employed to identify the endmembers of pure mangrove in the training areas. The results are consistent with the current distribution of mangrove trees, and the remarkable feature of a “mangrove desert” highlights a fact that biodiversity can be easily and quickly destroyed if no protection is provided. Some remnant patches located by this research are very important to the management of mangrove trees.

scholarly journals Spectral Complexity of Hyperspectral Images: A New Approach for Mangrove Classification

2021 ◽  
Vol 13 (13) ◽  
pp. 2604
Author(s):  
Patrick Osei Darko ◽  
Margaret Kalacska ◽  
J. Pablo Arroyo-Mora ◽  
Matthew E. Fagan
Keyword(s):  
Statistical Physics ◽  
Near Infrared ◽  
Information Gain ◽  
Hyperspectral Imagery ◽  
Full Range ◽  
Surface Reflectance ◽  
Mangrove Species ◽  
New Approach ◽  
Spatio Temporal ◽  
Shortwave Infrared

Hyperspectral remote sensing across multiple spatio-temporal scales allows for mapping and monitoring mangrove habitats to support urgent conservation efforts. The use of hyperspectral imagery for assessing mangroves is less common than for terrestrial forest ecosystems. In this study, two well-known measures in statistical physics, Mean Information Gain (MIG) and Marginal Entropy (ME), have been adapted to high spatial resolution (2.5 m) full range (Visible-Shortwave-Infrared) airborne hyperspectral imagery. These two spectral complexity metrics describe the spatial heterogeneity and the aspatial heterogeneity of the reflectance. In this study, we compare MIG and ME with surface reflectance for mapping mangrove extent and species composition in the Sierpe mangroves in Costa Rica. The highest accuracy for separating mangroves from forest was achieved with visible-near infrared (VNIR) reflectance (98.8% overall accuracy), following by shortwave infrared (SWIR) MIG and ME (98%). Our results also show that MIG and ME can discriminate dominant mangrove species with higher accuracy than surface reflectance alone (e.g., MIG–VNIR = 93.6% vs. VNIR Reflectance = 89.7%).

A study on abundance and distribution of mangrove species in Indian Sundarban using remote sensing technique

2014 ◽  
Vol 18 (4) ◽  
pp. 359-367 ◽  
Author(s):  
Sandip Giri ◽  
Anirban Mukhopadhyay ◽  
Sugata Hazra ◽  
Sandip Mukherjee ◽  
Deborupa Roy ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Mangrove Species ◽  
Remote Sensing Technique ◽  
Indian Sundarban ◽  
Abundance And Distribution

scholarly journals Geographic and environmental contributions to genomic divergence in mangrove forests

2020 ◽  
Author(s):  
Michele Fernandes da Silva ◽  
Mariana Vargas Cruz ◽  
João de Deus Vidal Júnior ◽  
Maria Imaculada Zucchi ◽  
Gustavo Maruyama Mori ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Avicennia Germinans ◽  
Global Changes ◽  
Mangrove Forests ◽  
Tidal Variation ◽  
Mangrove Species ◽  
Coastal Species ◽  
Precipitation Regimes ◽  
Isolation By Environment ◽  
Mangrove Trees

ABSTRACTAssessing the relative importance of geographic and environmental factors to the spatial distribution of genetic variation may provide relevant information about the processes that maintain genetic variation in natural populations. With a globally wide but very restricted habitat distribution, mangrove trees are an interesting model for studies aiming to understand the contributions of these factors. Mangroves occur along the continent-ocean interface of tropical and subtropical latitudes, regions considered inhospitable to many other plant types. Here, we used landscape genomics approaches to investigate the relative contributions of geographic and environmental variables to the genetic variation of two black mangrove species, Avicennia schaueriana and Avicennia germinans, along the South American coast. Using single nucleotide polymorphisms, our results revealed an important role of ocean currents in the gene flow of A. schaueriana and isolation by environment as the pattern that best explains the genetic differentiation of A. germinans. Additionally, for both species, we observed significant correlations between genetic variation with evidence of selection and precipitation regimes, tidal variation, solar radiation and temperature patterns. These discoveries expand our knowledge about the evolution of mangrove trees and provide important information to predict future responses of coastal species to the expected global changes for this century.

scholarly journals Potensi Vegetasi dan Arthropoda di Kawasan Mangrove Gili Sulat Lombok Timur

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
Agil Al Idrus, Gito Hadiprayitno I Gede Mertha dan Liwa Ilhamdi
Keyword(s):  
Direct Observation ◽  
Diversity Index ◽  
Data Retrieval ◽  
Observation Data ◽  
Arthropod Communities ◽  
Mangrove Species ◽  
Ecological Economic ◽  
Geographical Position

ABSTRAKPenelitian ini  dilakukan di Gili Sulat pada pada posisi  geogafis 8016' 46" - 8020' 44" LS dan 116041'06" - 116044'35" BT  dengan  tujuan  untuk menganalisis potensi dan  kekhasan  vegetasi  dan Artropoda  pada komunitas mangrove  di Gili Sulat Lombok Timur. Metode  penelitian potensi kekhasan vegetasi dan fauna yang ada di Kawasan Mangrove Gili Sulat dilakukan dengan menggunakan metode pengamatan langsung. Pengambilan data vegetasi dilakukan pada transek dengan metode kwadrat dalam 15 plot, sedangkan pengambilan data fauna dilakukan sebanyak enam kali denga menggunaka Pitfalltrap pada daerah 300 m2. Analisis   kekhasan vegetasi dengan menghitung INP  dan Indeks keanekaragaman. Sedangkan Artropoda dengan menghitung potensi dan indeks keanekaragaman. Hasil penelitian menunjukkan bahwa ada 7  dari 11 spesies mangrove yang khas ditemukan  di  stasiun II Gili Sulat, sedangkan Arthropoda yang ditemukan berjumlah 18 spesies. Delapan spesies dengan frekuensi kehadiran  100% yaitu Ptenothrix fisecllat, Entomobrya cingula, Folsomia octoculata, Hypogastrura armata, Acheta sp.,  Anineus sp., Palaemonetes sp., Uca sp.  Kesimpulan dari penelitian ini adalah vegetesai mangrove dan Artropoda mempunyai potensi ekologis, ekonomis, dan estetika yang bernilai tinggi.Kata kunci: Pemetaan, kekhasan, vegetasi, fauna,  dan mangrove. ABSTRACTThis research was conducted in Gili Sulat on a geographical position 8016 '46' - 8020 '44 "latitude and 116041'06" - 116044'35 "BT for the purpose of analyzing the potential and peculiarities of vegetation and mangrove arthropod communities in East Lombok Gili Sulat. Methods of the research potential of the peculiarities of the vegetation and fauna that exist in the region Gili Sulat Mangrove conducted using direct observation. Data retrieval vegetation transect method performed on the square of the 15 plots, while the fauna data retrieval held six times menggunaka Pitfalltrap premises on the area of 300 m2. Analysis of vegetation by counting INP distinctiveness and diversity index. While arthropod to calculate the potential and diversity index. The results showed that there were 7 of 11 mangrove species are typically found in the station II Gili Sulat, while Arthropods found amounted to 18 species. Eight species with the frequency of attendance of 100%, ie Ptenothrix fisecllat, Entomobrya cingula, Folsomia octoculata, Hypogastrura armata, Acheta sp., Anineus sp., Palaemonetes sp., Uca sp. The conclusion of this study is vegetesai mangrove and arthropod has the potential ecological, economic, and aesthetic value.Keywords : Mapping, distinctiveness, vegetation, fauna, and mangrove

Ascocratera manglicola gen. et sp. nov. and key to the marine Loculoascomycetes on mangroves

1986 ◽  
Vol 64 (12) ◽  
pp. 3036-3042 ◽  
Author(s):  
Jan Kohlmeyer
Keyword(s):  
New Genus ◽  
Dead Wood ◽  
New South ◽  
New South Wales ◽  
Single Species ◽  
Marine Species ◽  
Avicennia Germinans ◽  
Laguncularia Racemosa ◽  
South Wales ◽  
Mangrove Trees

The new genus Ascocratera (Melanommatales, Massariaceae?) with the single species A. manglicola is described from dead wood of mangrove trees (Avicennia germinans, Conocarpus erecta (?), Laguncularia racemosa, Rhizophora mangle) in the Atlantic and Pacific oceans. The new obligately marine species is one of the most common intertidal fungi. It has been collected 42 times on seven islands off the Belize coast and in Bermuda, Mexico, Tobago, and Australia (New South Wales). A key for all 16 marine Loculoascomycetes occurring on mangroves is given.

scholarly journals LARGE-SCALE PHYSICAL MODELING OF COASTAL PROTECTION PROVIDED BY A MODEL RHIZOPHORA MANGROVE FOREST

2018 ◽  
pp. 66
Author(s):  
Maria Maza ◽  
Javier L. Lara ◽  
Inigo J. Losada
Keyword(s):  
Large Scale ◽  
Root Systems ◽  
Coastal Protection ◽  
Mangrove Forests ◽  
Complex Root ◽  
Mangrove Species ◽  
Flow Energy ◽  
Aerial Roots ◽  
Waves And Currents ◽  
Mangrove Trees

Mangrove forests exist in intertidal areas of tropical zones and most are characterized by their complex root systems, which attenuates flow energy. Among the mangrove species, Rhizophora species is the most common one, representing approximately 90% of the world mangrove distribution (Ohira et al., 2013). In addition, this species is used in the majority of restoration projects. Rhizophora plants are characterized by their aerial roots, which form a network above the substrate. Although several studies have been performed in the last decade to characterize flow interaction with mangrove trees (e.g.: Zhang et al., 2015), there is still a lack of knowledge of the forces exerted on the trees and the attenuation produced under waves, currents and waves and currents flowing simultaneously action.

Mangrove species distribution in relation to tide at the seafront and up rivers

1985 ◽  
Vol 36 (4) ◽  
pp. 481 ◽  
Author(s):  
JS Bunt ◽  
WT Williams ◽  
ED Bunt
Keyword(s):  
Sea Level ◽  
Species Distribution ◽  
Single Species ◽  
Land Plants ◽  
Mangrove Species ◽  
Dry Land ◽  
Height Range ◽  
Technical Problems ◽  
Mean Sea Level

The technical problems of estimating the topographic height of a mangrove species or community are discussed. Transects normal to the seaward mangrove face were taken around the coast of Australia. They confirm that a stable margin will be approximately at mean sea level but that erosion, accretion or other disturbance may cause variation of the order of �1 m. Studies in four species-rich rivers in north Queensland show that (i) there are marked distributional differences with respect to topographic height between long and short river estuaries, these differences being attributable to different tidal patterns; and (ii) there appear to be two mangrove types: the frontal species are tolerant of inundation, poorly adapted to emersion, whereas the upstream species behave as dry-land plants tolerant of only limited inundation. The topographic height range of individual plants of a single species may be almost 4 m, so that observations on individual plants are of little value.

Estimation of abundance and distribution of two moist tall grasses in the Watarase wetland, Japan, using hyperspectral imagery

2009 ◽  
Vol 64 (6) ◽  
pp. 674-682 ◽  
Author(s):  
Shan Lu ◽  
Yo Shimizu ◽  
Jun Ishii ◽  
Syo Funakoshi ◽  
Izumi Washitani ◽  
...  
Keyword(s):  
Hyperspectral Imagery ◽  
Abundance And Distribution

scholarly journals The distribution of vertical leaves and leaves biomass on ten mangrove species at Ngurah Rai Forest Park, Denpasar, Bali, Indonesia

2018 ◽  
Vol 19 (3) ◽  
pp. 918-926 ◽  
Author(s):  
I PUTU GEDE ARDHANA ◽  
I M.G. S. RIMBAWAN ◽  
PUJO NUR CAHYO ◽  
YUYUN FITRIANI ◽  
SISKA ROHANI
Keyword(s):  
Middle Part ◽  
Stem Diameter ◽  
Stem Volume ◽  
Mangrove Species ◽  
Bottom Part ◽  
Forest Park ◽  
The Relationship ◽  
Mangrove Trees

Ardhana IPG, Rimbawan IMGS., Cahyo PN, Fitriani Y, Rohani S. 2018. The distribution of vertical leaves and leaves biomass on ten mangrove species at Ngurah Rai Forest Park, Denpasar, Bali, Indonesia. Biodiversitas 19: 918-926. The distribution of vertical leaves and leaves biomass which forms the mangrove crown divides into three parts, namely the top part, the middle part, and the bottom part. Total amount leaves on any parts are highly variable depending on height of each species. The relationship between the height of tree with the crown thickness depended on total leaves of each crown on each species as well as the relationship between the total leaves biomass of each crown on each species, with the height and volume of tree stems, also has variation on each mangrove species. Author examined the relationship between the photosynthetic organs with non-photosynthetic organs, especially on stems in each species. The high total amount of leaves and large total amount leaves biomass deeply is depended on diameter and growth height which are presented in the form of stem volumes. On the relationship between the photosynthetic organs and non-photosynthetic organs on each mangrove species, also has been examined. The higher total amount of leaves or the total amount of leaves biomass largely depended on the stem volume of mangroves. This indicates that the production of photosynthetic organ either in the form of the total amount of leaves or the total amount of leaves biomass serve to support growth of the stem mangrove trees (height of stem, diameter of stem and volume of stem).

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