scholarly journals DISTRIBUSI DAN KELIMPAHAN LARVA IKAN DI KAWASAN PERAIRAN DESA MANGUNHARJO KECAMATAN TUGU KOTA SEMARANG

2018 ◽  
Vol 7 (1) ◽  
pp. 86-98
Author(s):  
Handika Wahyu Viyoga ◽  
Anhar Solichin ◽  
Nurul Latifah
Keyword(s):  
Fish Larvae ◽  
Fish Larva ◽  
Environmental Parameters ◽  
Distribution Patterns ◽  
Mangrove Ecosystem ◽  
Coastal Ecosystem ◽  
Sampling Point ◽  
Correlation Criterion ◽  
Morisita Index ◽  
Family Based

Distribusi dan kelimpahan larva ikan sangat bergantung dengan kondisi perairan di dalamnya. Kawasan perairan Desa Mangunharjo merupakan daerah yang unik karena memiliki tiga ekosistem yang berbeda yaitu ekosistem pantai, ekosistem muara, dan ekosistem mangrove. Penelitian ini bertujuan untuk mengetahui pola distribusi dan kelimpahan larva ikan pada tiga ekosistem yang berbeda di kawasan perairan Desa Mangunharjo. Penelitian dilaksanakan pada bulan Juli-Agustus 2017. Metode penelitian yang digunakan adalah survei dengan penentuan titik sampling secara systematic random. Hasil yang diperoleh menunjukkan bahwa jumlah larva ikan yang tertangkap sebanyak 1.089 individu terdiri dari 7 famili yakni: Ambassidae (260 ind/100m3), Nemipteridae (94 ind/100m3), Engraulidae (424 ind/100m3), Apogonidae (20 ind/100m3), Mugilidae (156 ind/100m3), Gobidae (37 ind/100m3), dan Chanidae (98 ind/100m3). Larva ikan famili Engraulidae tertangkap paling banyak selama dilakukan penelitian. Berdasarkan analisis indeks Morisita, pola distribusi larva ikan adalah acak. Kesimpulan yang dapat diperoleh ialah nilai kelimpahan larva ikan tertinggi terdapat pada ekosistem pantai sebesar 673 ind/100m3 dan terendah terdapat pada ekosistem muara sebesar 188 ind/100m3. Nilai keanekaragaman pada ekosistem pantai, muara, dan mangrove tergolong sedang. Nilai keseragaman di semua ekosistem pengambilan sampel termasuk tinggi. Nilai indeks dominasi pada setiap ekosistem termasuk dalam kriteria nilai yang mendekati 0, yang dapat diartikan tidak ada individu yang mendominasi. Hasil uji Kruskal Wallis untuk nilai kelimpahan larva ikan menunjukkan terdapat perbedaan kelimpahan larva ikan yang nyata di setiap ekosistem. Keterkaitan parameter lingkungan dengan kelimpahan larva ikan yang di uji menggunakan regresi linier berganda menunjukkan nilai korelasi (R) yang termasuk ke dalam kriteria hubungan sedang, untuk nilai determinasi (R2) sebesar 0,131 yang menunjukkan 13,1% kelimpahan ikan dipengaruhi oleh parameter lingkungan. The distribution and abundance of fish larvae depends on the condition of the waters. The waters of Mangunharjo Village are unique because they have three different ecosystems, the first coastal ecosystem, the two estuarine ecosystems, and the last of the mangrove ecosystem. This study aims to determine the distribution patterns and abundance of fish larvae in three different ecosystems in the waters of Mangunharjo Village. The research was conducted on July-August 2017. The research method used the survey, with sistematic random sampling point. The results showed amount of fish larvae caught were 1,089 individuals consisting of 7 families, that is Ambassidae (260 ind/100m3), Nemipteridae (94 ind/100m3), Engraulidae (424 ind/100m3), Apogonidae (20 ind/100m3), Mugilidae (156 ind/100m3), Gobidae (37 ind/100m3), and Chanidae (98 ind/100m3). The most larvae caught on the study is Engraulidae family. Based on the Morisita index analysis, the pattern of fish larvae distribution is random. The conclusion that can be obtained is the highest value of fish larvae abundance found in the coastal ecosystem of 673 ind / 100m3 and the lowest is in the estuary ecosystem of 188 ind / 100m3. The value of diversity in coastal, estuarine and mangrove ecosystems is moderate. The value of uniformity in all sampling ecosystems is high. The value of the dominance index in all ecosystem is included in the criterion of value close to 0, which can be interpreted as no individual dominates. The Kruskal Wallis test results for the fish larvae abundance values indicate that there are differences in fish larva abundance which is evident in each ecosystem. The correlation of environmental parameters with abundance of fish larvae tested using multiple linear regression showed correlation value (R) belonging to intermediate correlation criterion, for determination value (R2) equal to 0,131 showing 13,1% fish abundance influenced by environmental parameter.

scholarly journals KOMPOSISI LARVA IKAN DI KAWASAN KOSERVASI MANGROVE DUSUN SENIK, DESA BEDONO, KECAMATAN SAYUNG, DEMAK

2018 ◽  
Vol 6 (2) ◽  
pp. 147-155
Author(s):  
Rexa Kurnia Rinaldi ◽  
Niniek Widyorini ◽  
Pujiono Wahyu Purnomo
Keyword(s):  
Distribution Pattern ◽  
Larval Fish ◽  
Fish Larvae ◽  
Mangrove Ecosystem ◽  
Fish Distribution ◽  
Sampling Point ◽  
Conservation Area ◽  
Morisita Index ◽  
Early Growth Phase ◽  
Mangrove Conservation

ABSTRAK Stadia larva merupakan fase pertumbuhan awal ikan. Distribusi dan Kelimpahan larva ikan di Ekosistem Mangrove merupakan proses rekruitmen alami. Kawasan Konservasi Mangrove Dusun Senik Desa Bedono merupakan daerah asuhan dan daerah mencari makan bagi larva ikan, saat ini daerah tersebut terkena abrasi. Hilangnya sebagian besar daratan memberikan pengaruh terhadap distribusi dan kelimpahan larva ikan. Penelitian ini bertujuan untuk mengetahui jenis, kelimpahan, dan sebaran larva ikan di kawasan konservasi mangrove Desa Bedono. Penelitian dilakukan di Kawasan Konservasi Mangrove Desa Bedono bulan September - Oktober 2016.  Metode penelitian yang digunakan adalah survei dengan penentuan titik sampling secara purposive. Hasil yang diperoleh jumlah larva ikan yang tertangkap sebanyak 20.320 individu/150m3 yang terdiri dari 12 famili yaitu: Mugilidae (1.120 ind/150m3), Chanidae (20 ind/150m3), Gerreidae (60 ind/150m3), Apogonidae (17.360 ind/150m3),  Scatophagidae (40 ind/150m3), Gobiidae (180 ind/150m3), Belonidae (40 ind/150m3), Ambassidae (20 ind/150m3), Lutjanidae (620 ind/150m3), Engraulidae (60 ind/150m3), Nemipteridae (40 ind/150m3), dan Oryziatidae (760 ind/150m3). Nilai kelimpahan larva ikan pada titik I sebesar 393 ind/150m3, titik II sebesar 607 ind/150m3, titik III sebesar 800 ind/150m3, titik IV sebesar 1.687 ind/150m3, titik V sebesar 1.633 ind/150m3, titik VI sebesar 607 ind/150m3, titik VII sebesar 235 ind/150m3, titik VIII sebesar 793 ind/150m3. Berdasarkan indeks morisita, pola sebaran larva ikan adalah acak. Kesimpulan yang dapat diambil adalah famili Apogonidae mendominasi dengan persentase 85,43%, nilai kelimpahan tertinggi terdapat pada titik IV, dan pola distribusi larva ikan menyebar secara acak yaitu keberadaan spesies tidak memiliki kecenderungan untuk hidup berkoloni dan dapat bertahan hidup di mana saja pada suatu ekosistem. Kata Kunci : Larva ikan; Komposisi; Kelimpahan; Pola Distribusi; Kawasan Konservasi Mangrove ABSTRACT Larval stage is the early growth phase of fish. Distribution and abundance of larval fish in mangrove ecosystem is a natural recruitment process. Mangrove Conservation Area at Senik hamlet Bedono village is the breeding and feeding areas for fish larvae, now the area is damaged by abrasion. The loss of the most mainland affects to the distribution and abundance of fish larvae. This study aims to determine the type, abundance and distribution of fish larvae in mangrove conservation area at Bedono village. The study was conducted in Bedono village Mangrove Conservation Area in September-October 2016. The research method that is used is a survey with purposive sampling point determination. The results obtained, the number of fish larvae caught are 20.320 individuals/150m3 consisting of 12 families, namely: Mugilidae (1.120 ind/150m3), Chanidae (20 ind/150m3), Gerreidae (60 ind/150m3), Apogonidae (17.360 ind/150m3), Scatophagidae (40 ind/150m3), Gobiidae (180 ind/150m3), Belonidae (40 ind/150m3), Ambassidae (20 ind/150m3), Lutjanidae (620 ind/150m3), Engraulidae (60 ind/150m3), Nemipteridae (40 ind/150m3), and Oryziatidae (760 ind/150m3). The value abundance of fish larvae in point I is 393 ind/150m3, in point II is 607 ind/150m3, in point III is 800 ind/150m3, point IV is 1.687 ind/150m3, point V is 1.633 ind/150m3, point VI is 607 ind/150m3, point VII is 235 ind/150m3, point VIII is 793 ind/150m3. Based on morisita index, the distribution pattern of fish larvae is random. The conclusion of this research are family Apogonidae dominates by percentage 85.43%, the highest abundance values is contained in point IV, and the  distribution pattern of fish larvae randomly spread, means that the species does not live in colonies and can survive anywhere in an ecosystem. Keywords     : Fish Larvae; Composition; Abundance; Distribution; Mangrove Conservation Area

scholarly journals Study of Fiddler Crab (Uca sp.)Community in Mangrove Ecosystem of Mangrove Areas Curahsawo Probolinggo, East Java

2019 ◽  
Vol 10 (1) ◽  
pp. 31-37
Author(s):  
Agung Riswandi ◽  
Endang Yuli H ◽  
Mulyanto Mulyanto
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Texture ◽  
Fiddler Crab ◽  
Sandy Loam ◽  
Distribution Patterns ◽  
Mangrove Ecosystem ◽  
Sampling Point ◽  
Fiddler Crabs ◽  
Uca Lactea

Fiddler crab (Uca sp.)one of the crabs that inhabit the intertidal area, especially around the mangrove forest research was conducted in the mangrove areas Curahsawo, district of Gending, Probolinggo, East Java in April 2017. The aim of this study is to determine the structure community violin crabs in the mangrove areas Curahsawo Probolinggo. The measured parameters namely pH, soil organic matter and soil texture. Sampling point there are three stations, namely station 1 is mangrove area, station 2 is in the pond area, the station 3 is the estuary area. Results of measurement of environmental quality at the location of research is soil pH among 7.09 to 8.03, soil organic matter among 1.027% to 3.106%, and the type of soil is sandy clay and dusty clay. fiddler crabs are found in mangrove ecosystem Curahsawo there are 6 types of Uca rosea, Uca lactea, vocans Uca, Uca perplexa, dussumieri Uca, Uca demani. The highest density of crabs is Uca perplexa as much as 16 ind/m2, the lowest type of Uca demani 4 ind/m2. Value diversity fiddler crabs in mangrove ecosystem Sawo relatively standart is 1,56. The value of existing dominance is 0,96. Index violin crab distribution patterns in the Mangrove Ecosystem Munitions Sawo is uniform for Uca lactea, Uca vocans, Uca dussumieri , Uca demani and clumped to Uca rosea and Uca perplexa. The result of the spread of  fiddler crab to the type of soil texture is very visible on the Uca perplexa since spread across all points of soil sampling with the number 6 ind/m2 to 16 ind/m2 in the texture of  clay and sandy loam.

scholarly journals DISTRIBUSI DAN KELIMPAHAN LARVA IKAN DI KAWASAN PERAIRAN PANTAI DUKUH BEDONO KECAMATAN SAYUNG KABUPATEN DEMAK (Distribution and Abundance of Fish Larvae in Coastal Waters of Bedono Village, Sayung, Demak Regency)

2018 ◽  
Vol 6 (4) ◽  
pp. 339-347
Author(s):  
Avisha Fauziah Erzad ◽  
Sahala Hutabarat ◽  
Max Rudolf Muskananfola
Keyword(s):  
Coastal Waters ◽  
Research Method ◽  
Fish Larvae ◽  
Coastal Region ◽  
Sampling Point ◽  
Mangrove Plant ◽  
Index Analysis ◽  
Life Phase ◽  
Morisita Index ◽  
Distribution Of Fish

Larva ikan merupakan fase kehidupan awal dari pertumbuhan ikan dimana perkembangan organ tubuh belum terbentuk secara sempurna. Distribusi dan kelimpahan larva ikan sangat bergantung pada kondisi perairan di dalamnya. Kawasan perairan pantai merupakan perairan yang terhubung langsung ke laut dan masih dipengaruhi oleh aktivitas daratan. Perairan pantai dukuh Bedono mengalami degradasi akibat berkurangnya tanaman mangrove dan terjadinya rob. Penelitian ini bertujuan untuk mengetahui distribusi dan kelimpahan larva ikan di kawasan perairan pantai dukuh Bedono. Penelitian dilaksanakan pada bulan Maret-April 2017. Metode penelitian yang digunakan adalah survei dengan penentuan titik sampling secara purposive. Hasil yang diperoleh menunjukkan bahwa jumlah larva ikan yang tertangkap sebanyak 2.064 individu terdiri dari 10 famili yakni: Ambassidae (245 ind/100 m3), Mugilidae (507 ind/100 m3), Chanidae (378 ind/100 m3), Engraulidae (288 ind/100 m3), Lutjanidae (73 ind/100 m3), Nemipteridae (109 ind/100 m3), Carangidae (145 ind/100 m3), Gobiidae (160 ind/100 m3), Gerreidae (92 ind/100 m3), dan Oryziatidae (67 ind/100 m3). Larva ikan famili Mugilidae tertangkap paling banyak selama pelaksanaan penelitian. Berdasarkan analisis indeks morisita, pola sebaran larva ikan adalah acak. Kesimpulan yang dapat diperoleh ialah nilai kelimpahan larva ikan tertinggi terdapat pada titik IV sebesar 267 ind/100m3 dan terendah terdapat pada titik III sebesar 185 ind/100 m3. Pola persebaran larva ikan pada semua titik adalah acak dimana semua larva ikan dapat menyesuaikan dan bertahan hidup di mana saja pada suatu ekosistem. Fish larvae are the early life phase of the growth of fish where the development of organs has not been fully formed. The distribution and abundance of fish larvae depend on the condition of the waters in it. Coastal waters are waters that connect directly to the sea and are still influenced by land activities. The coastal waters of Bedono village have degradation due to the decreasing of mangrove plant and the increasing of seawater period. This study aims to determine the distribution and abundance of fish larvae in the coastal region of Bedono village. The research was conducted in March-April 2017. The research method used was a survey with purposive sampling point. The results showed that the number of captured fish larvae of 2,064 individuals consisted of 10 families: Ambassidae (245 ind/100 m3), Mugilidae (507 ind/100 m3), Chanidae (378 ind/100 m3), Engraulidae (288 ind/100 m3) , Lutjanidae (73 ind/100 m3), Nemipteridae (109 ind/100 m3), Carangidae (145 ind/100 m3), Gobiidae (160 ind/100 m3), Gerreidae (92 ind/100 m3), and Oryziatidae (67 ind/100 m3). Fish larvae of the Mugilidae family were caught at the most during the study. Based on the morisita index analysis, the pattern of fish larvae distribution is random. The conclusion that can be obtained is the highest value of fish larvae abundance found at point IV of 267 ind/100 m3 and the lowest is at point III of 185 ind/100 m3. The pattern of the distribution of fish larvae at all points is unevenly where all fish larvae can adapt and survive anywhere in an ecosystem.

scholarly journals DISTRIBUSI DAN KELIMPAHAN LARVA IKAN PADA EKOSISTEM MANGROVE DI DESA PASAR BANGGI KABUPATEN REMBANG

2016 ◽  
Vol 5 (4) ◽  
pp. 199-208
Author(s):  
Firtasari Simanullang ◽  
Djuwito Djuwito ◽  
Abdul Ghofar
Keyword(s):  
Sampling Method ◽  
Larval Fish ◽  
Fish Larvae ◽  
Fish Larva ◽  
Diversity Indices ◽  
Mangrove Ecosystem ◽  
Stratified Sampling ◽  
Mangrove Area ◽  
Central Java ◽  
Key Words Fish

ABSTRAK Kabupaten Rembang merupakan salah satu kabupaten yang  terletak di pesisir Pantai utara Jawa Tengah yang mempunyai kawasan rehabilitasi mangrove seluas 106,66 ha. Ekositem mangrove di Kabupaten Rembang telah dikelola oleh masyarakat dan LSM setempat untuk dijadikan kawasan wisata dan masyarakat juga membuka lahan tambak yang dapat memberi tekanan bagi fungsi ekologis mangrove. Salah satu dampak yang sangat dikhawatirkan adalah terganggunya habitat vital serta perkembangan larva ikan di area asuhan hutan mangrove. Tujuan penelitian ini adalah mengetahui jenis famili larva ikan, distribusi, kelimpahan, keseragaman, keanekaragaman dan dominasi larva ikan di ekosistem mangrove di Desa Pasar Banggi Kabupaten Rembang. Penelitian ini dilakukan pada bulan April 2016. Pengambilan sampel dilakukan sebanyak tiga kali, dengan interval waktu 1 minggu sekali. Penelitian ini menggunakan metode survei sedangkan pengambilan sampel dilakukan dengan metode stratified sampling. Hasil penelitian didapatkan larva ikan dari tujuh famili, yaitu: Gerreidae, Gobiidae, Clupeidae, Engraulidae, Adrianichtyidae, Megalopidae dan Carangidae. Indeks keanekaragaman berkisar antara 0,087- 0,770, dengan nilai tertinggi di wilayah mangrove umur sekitar tiga  tahun. Indeks keseragaman berkisar antara 0,062 – 0,555, nilai tertinggi juga pada wilayah umur mangrove sekitar tiga tahun. Nilai indeks dominasi berkisar antara 0,577 – 0,972, dengan nilai tertinggi pada wilayah mangrove berumur lima puluh tahun. Kelimpahan tertinggi larva ikan yang tertangkap pada lokasi penelitian didapat pada wilayah A (wilayah mangrove berumur sekitar lima puluh tahun) adalah sebesar 40 Ind/m3, wilayah B (wilayah mangrove berumur sekitar tujuh tahun) sebesar 22 Ind/m3 dan yang terendah adalah wilayah C (wilayah mangrove berumur sekitar tiga tahun) sebesar 19 Ind/m3..                      Kata Kunci : Kelimpahan Larva Ikan; Mangrove; Kabupaten Rembang ABSTRACT Rembang Regency located in the northeastern part of Central Java which has 106.66 ha mangrove rehabilitation area. Mangrove ecosystem in Rembang has been managed by local communities and NGOs for eco-tourism. The local people also have actively cleared mangrove area for artificial ponds that are put an ecological pressure into mangrove ecosystem function.  One of the important impact that needs to be concerned is the disruption of vital habitat as well as the development of fish larvae in mangrove area. The purpose of this study was to determine the type of fish larvae families, distribution, abundance, uniformity, diversity and dominance of larval fish in in the mangrove ecosystem of Pasar Banggi, Rembang. The samplings were conducted in April 2016 three times, with intervals one week. The sampling method was done by stratified sampling method. In three times sampling we obtained seven families of fish larvae in the following name: Gerreidae, Gobiidae, Clupeidae, Engraulidae, Adrianichtyidae, Megalopidae and Carangidae. The diversity indices range between 0,087- 0,770, with the highest in level in mangrove area with mangrove age of three years. The uniformity index ranges between 0,062 – 0,555, the highest value is also in mangrove area with mangrove age of three years. The dominance index values ranging between 0,577 – 0,972, with the highest value in the in mangrove area with mangrove age of fifty years. Highest abundance of fish larvae were caught among the sites acquired in the area A ( mangrove area about fifty years ) is 40 Ind / m3 , region B ( mangrove area about seven years ) of 22 Ind / m3 and the lowest is the area C ( mangrove area about three years old ) by 19 Ind / m3 .Key Words: Fish Larva Abundance, Mangrove , Rembang District

HUBUNGAN KEPADATAN BIVALVIA DENGAN PARAMETER LINGKUNGAN DI PESISIR TANJUNG PURA KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 13 (2) ◽  
pp. 112-121
Author(s):  
Sudiyar . ◽  
Okto Supratman ◽  
Indra Ambalika Syari
Keyword(s):  
Negative Impact ◽  
Principal Component ◽  
Environmental Parameters ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Random System ◽  
System Method ◽  
Relationship Of ◽  
The Relationship ◽  
Anadara Granosa

The destructive fishing feared will give a negative impact on the survival of this organism. This study aims to analyze the density of bivalves, distribution patterns, and to analyze the relationship of bivalves with environmental parameters in Tanjung Pura village. This research was conducted in March 2019. The systematic random system method was used for collecting data of bivalves. The collecting Data retrieval divided into five research stasions. The results obtained 6 types of bivalves from 3 families and the total is 115 individuals. The highest bivalve density is 4.56 ind / m², and the lowest bivalves are located at station 2,1.56 ind / m²,  The pattern of bivalve distribution in the Coastal of Tanjung Pura Village is grouping. The results of principal component analysis (PCA) showed that Anadara granosa species was positively correlated with TSS r = 0.890, Dosinia contusa, Anomalocardia squamosa, Mererix meretrix, Placamen isabellina, and Tellinella spengleri were positively correlated with currents r = 0.933.

DIVERSITY OF FISH LARVAE AROUND THE ESTUARY OF THE BANYUASIN RIVER, SOUTH SUMATERA PROVINCE

2020 ◽  
Vol 6 (2) ◽  
Author(s):  
Moh. Rasyid Ridho ◽  
Enggar Patriono ◽  
Sarno Sarno ◽  
Sahira Wirda
Keyword(s):  
Initial Phase ◽  
Sampling Method ◽  
Environmental Changes ◽  
Negative Impact ◽  
Fish Larvae ◽  
River Estuary ◽  
Sampling Technique ◽  
Critical Phase ◽  
Morisita Index ◽  
Index Value

The initial phase of the fish life cycle is a critical phase associated with high mortality due to sensitivity to predators, food availability, and also environmental changes that occur in nature. Disruption of the initial stages of fish life has a negative impact on fish populations. Until now there has been no information about fish larvae around the Banyuasin River Estuary. Therefore, research is needed on the diversity of fish larvae around the Banyuasin River Estuary, South Sumatra Province. This research were used purposive sampling method, sampling technique in the form of Cruise Track Design with continuous parallel survey trajectory. Based on the results of the study found as many as 10 families consisting of 1483 individuals of fish larvae in March and 1013 individuals of fish larvae in May consisting of Engraulidae 1,601 individuals of fish larvae, Mungiloidei as many as 109 individuals, Leiognathidae 50 individuals, Chanidae 453 individuals, Scatophagidae 20 individuals , Belonidae 39 individuals, Gobioididae 5 individuals, Chandidae 183 individuals, Syngnatihidae 6 individuals, and Gobiidae 30 individuals fish larvae. The index value of fish larvae diversity is classified as medium category (March 1.02 and May 1.12), Morisita index shows the distribution pattern of fish larvae classified as a group (March 0-14.17 and May 2.43-10.40 ), and the evenness index value is in the medium category (March 0.437 and May 0.521).

scholarly journals Rafflesia patma Blume in Pananjung Pangandaran Nature Reserve, West Java: Population Structure, Distribution Patterns, and Environmental Influences

2021 ◽  
Vol 6 (3) ◽  
pp. 64800
Author(s):  
Bahana Aditya Adnan ◽  
Suwarno Hadisusanto ◽  
Purnomo Purnomo
Keyword(s):  
Population Structure ◽  
Nature Reserve ◽  
Principal Component ◽  
Sampling Technique ◽  
Distribution Patterns ◽  
Survey Method ◽  
Endemic Plant ◽  
West Java ◽  
Research Areas ◽  
Morisita Index

Rafflesia patma is an endemic plant of Pangandaran, West Java which is protected because of its rare status. The purpose of this research is to study the population structure, distribution patterns, and the effect of the physical environment of abundance R. patma in Pananjung Pangandaran Nature Reserve, West Java. The method used in this research was a survey method with a purposive sampling technique. Sampling was conducted using quadrat plots. The population pattern distribution was defined by a standardized Morisita index, and the analysis of abiotic environmental factors was determined by Principal Component Analysis (PCA) using PAST3. The results showed that there were 114 R. patma individuals scattered in several research areas in Pananjung Pangandaran Nature Reserve, they were Gua Parat (3 individuals), Cilegon (13 individuals), Pasir Putih (12 individuals), Badeto (48 individuals), and Curug Leutik (38 individuals). The distribution pattern of R. patma in Pananjung Pangandaran Nature Reserve was clustered with the Morisita index value (Id) > 1. Based on the PCA analysis, results that support the classification of the cluster analysis were obtained. Based on four abiotic environmental conditions analyzed, the most dominant character in influencing the distribution patterns and population structure of R. patma is light intensity. 

Ecological and environmental indicators of Brazil Nut Tree (Bertholletia excelsa Bonpl.) in Flona do Jamari, Rondônia

2020 ◽  
Vol 11 (7) ◽  
pp. 740-751
Author(s):  
Nilson Reinaldo Fernandes dos Santos Júnior ◽  
Diogo Martins Rosa ◽  
José Das Dores de Sá Rocha ◽  
Marta Silvana Volpato Sccoti ◽  
Scheila Cristina Biazatti ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Geographic Location ◽  
Distribution Patterns ◽  
Environmental Indicators ◽  
Diameter Distribution ◽  
Brazil Nut ◽  
Productive Potential ◽  
Morisita Index ◽  
Individual Trees

Mapping Brazil nut trees in the Amazon is essential for indicating its distribution patterns within different ecosystems, while also being useful to estimate the species productive potential. This study aimed to evaluate the spatial distribution of Brazil nut trees in Flona do Jamari – RO, considering its environmental and topographic conditions. A census was performed for all individual trees sized ≥ 35 cm in diameter at 1.30 m breast height (DBH) above the ground of six Annual Production Units (APU) in Forest Management Unit III (FMU-III), a 11,011.2 ha area of Flona do Jamari, RO. DBH and geographic location (GPS) were collected for each tree. Structure and diameter distribution were evaluated by abundance, density, dominance, and frequency. The Morisita index was used to identify the spatial distribution pattern. The environment was defined by the local relative height found along the drainage network, by the digital model Height Above the Nearest Drainage (HAND). Most trees were among DBH intermediate classes (60 to 140 cm), and only a few were young trees (DBH < 50 cm). Brazil nut trees present a random spatial distribution and a predominant distribution pattern of 'terra-firme (solid ground)'. Such information on the species structural, spatial, and ecological patterns serve as key elements for further studies on production potential.

Laju Dekomposisi Serasah Daun di Ekosistem Bakau Pulau Kelong, Kabupaten Bintan

2016 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
I Wayan Eka Dharmawan ◽  
Neviaty P. Zamani ◽  
Hawis H. Madduppa
Keyword(s):  
Leaf Litter ◽  
Decomposition Rate ◽  
Substrate Surface ◽  
Environmental Parameters ◽  
Mangrove Ecosystem ◽  
Mangrove Forests ◽  
Mangrove Species ◽  
Southeastern Part ◽  
Regional Productivity ◽  
High K

<strong>Decomposition Rate of Leaf Litter in The Mangrove Ecosystem of Kelong Island, Bintan Regency.</strong> The mangrove forests in the southeastern part of Kelong Island have abundant carbon reserves that indicate high primary productivity areas. Decomposition of leaf litter, as a part of regional productivity, produces simple essential nutrients utilized to sustain the growth of mangroves. The purpose of this study was to determine the decomposition rate of leaf litter in each zone of the study, the Landward (L), Middlezone (M), and Seaward (S) which is distinguished by the abundance of plant species and in situ environmental parameters. The experiment was conducted in March–May 2015 in the mangrove areas of Island Kelong, Bintan regency. The decomposition process was observed at six time intervals, i.e. 2, 4, 7, 14, 28, and 42 days using net bag containing 10 g of wet leaves placed on the substrate surface. The results showed that L was a zone with highest percentage of decomposition (56.34 ± 20.58%) compared to the M and S, respectively for 51.59 ± 15.46% and 51.09 ± 8.70%. The highest rate of litter decomposition in zone L was 1.40 ± 0.82 g·m-2·day-1 that was significantly different from the zones M and S, respectively of 0.83 ± 0.89 g·m-2·day-1 and 0.78 ± 0.70 g·m-2·day-1.  Analysis of the coefficient of decomposition rate (k) indicated that the rate of decomposition in this region was high (k &gt; 0.01). The decomposition rate has a significant correlation with the abundance of mangrove species, the salinity value of the water, and soil temperature.

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