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

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 THE CHANGE OF MANGROVE COVERAGE IN SEGARAANAKAN LAGOON OF CILACAP – CENTRAL JAVA

2013 ◽  
Vol 19 (2) ◽  
pp. 81
Author(s):  
Bagus Oktori Sutrisno ◽  
Slamet Budi Prayitno
Keyword(s):  
Mangrove Ecosystem ◽  
Vegetation Coverage ◽  
Analysis Method ◽  
Landuse Change ◽  
Mangrove Area ◽  
Central Java ◽  
Area Of Interest ◽  
Map Processing ◽  
High Sedimentation ◽  
Segara Anakan Lagoon

Mangrove ecosystem play san important role in coastal area. In several region mangrove coverage had decreased caused by various factors such as landuse change, erosion and sedimentation. Mangrove ecosystem in Segara Anakan Lagoon had decreased and damaged as well. The current work aimed to analyze the change of mangrove coverage in Segara Anakan Lagoon. A remote sensing analysis was conducted to deployeight years of satellite imagery data from 2002 to 2009. Analysis method included NDVI algorythm map processing which was associated with vegetation coverage in the area of interest. The results show that mangrove coverage in Segara Anakan Lagoon had decreased from 9,163.19 ha in 2002 to 8,433 ha in 2003, 7,764 ha in 2004, 7,252.72 ha in 2005 and 6,213.80 ha in 2006 respectvely. Further decrease occured in 2007 to 5,767.16 ha, 4,987 ha in 2008 and finally to 4,267.13 ha in 2009. Mangrove coverage is decreased approximately 677 ha each year. This decrease might be caused by several factors such as conversion of mangrove coverage to other utilization such as farming, housing and ponds, and high sedimentation rate from Citanduy river. These results suggest that management of mangrove area is needed to support coastal resources sustainability in Cilacap. Therefore, replantation and<br />conservation of mangrove area could be applied for management purposes.

scholarly journals Diversitas Gastropoda pada Akar Mangrove di Pulau Sirandah, Padang, Sumatera Barat

2018 ◽  
Vol 5 (1) ◽  
pp. 34
Author(s):  
Hirzan Riyandi ◽  
Indra Junaidi Zakaria ◽  
Izmiarti Izmiarti
Keyword(s):  
Mangrove Forest ◽  
Sampling Method ◽  
Diversity Indices ◽  
Mangrove Ecosystem ◽  
Survey Method ◽  
Purposive Sampling ◽  
Negative Effect ◽  
Mangrove Roots

Currently, there are a lot of activities in Sirandah Island, such as tourism activities and deforestation to support the activities. Mangrove forest distruction makes a useable area might have negative effect to mangrove ecosystem itself or mollusc community. This research was conducted on mangrove roots area from February until October 2016. The aim of this research is to know the diversity of Gastropods on the roots of the mangrove. This research was conducted using survey method and purposive sampling method to collecting data. We recorded 8 genera of Gastropods belong to 8 families, named Cerithium, Conus, Ellobium, Littorina, Melongena, Nerita, Cymatium and Turbo. The highest abundance was found in the genus of  Littorina with 59.33 individuals/tree. Based on location, abundance ranged from 4.33-60.33 individuals/tree with the highest abundance on mangrove roots of Barringtonia asiatica. Diversity indices of Gastropods on mangrove roots in Sirandah Island ranged from 0.77 to 1.42 which is relative low range.

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 KELIMPAHAN LARVA UDANG PENAEID PADA EKOSISTEM MANGROVE DI DESA PASAR BANGGI, KABUPATEN REMBANG

2017 ◽  
Vol 5 (4) ◽  
pp. 412-419
Author(s):  
Pratiwi Genesi Siagian ◽  
Djuwito Djuwito ◽  
Suradi Wijaya Saputra
Keyword(s):  
Multiple Regression ◽  
Sampling Method ◽  
Penaeid Shrimp ◽  
Mesh Size ◽  
Sampling Technique ◽  
Mangrove Ecosystem ◽  
Current Speed ◽  
Stratified Sampling ◽  
Feeding Area

ABSTRAKPeran ekosistem mangrove sebagai daerah asuhan dan daerah mencari makan bagi larva udang, dimana sumber benih udang secara alami dapat dimanfaatkan oleh petambak. Oleh karena itu, keberadaan larva udang penaeid dapat memberikan informasi tentang data sebaran larva. Tujuan penelitian ini untuk mengetahui jenis larva udang penaeid di ekosistem mangrove, mengetahui kelimpahan dan dominansi larva udang penaeid dan mengetahui hubungan dan pengaruh variabel kualitas air terhadap kelimpahan larva udang penaeid pada ekosistem mangrove di Desa Pasar Banggi, Kabupaten Rembang. Penelitian dilakukan pada bulan April-Mei 2016. Lokasi penelitian terdiri dari mangrove umur 50 tahun, 7 tahun dan 3 tahun. Teknik pengambilan sampel larva udang dalam penelitian menggunakan metode stratified sampling. Pengambilan sampel larva udang penaeiddengan mendorong scoop netsejauh 50 meter, mesh size 0,5 mm. Jenis larva udang penaeid yang ditemukan selama penelitianyaitu Sicyonia, Trachypenaeus, Xyphopenaeus, Penaeus dan larva tidak teridentifikasi.Larva genus Trachypenaeus dan Penaeus selalu muncul pada ketiga wilayah, sedangkan genus Sicyonia dan Xyphopenaeus tidak muncul satu kali pada mangrove umur 7 tahun dan 3 tahun.Kelimpahan larva udang penaeid tertinggi diperolehselama penelitian pada mangrove umur 3 tahun diikuti mangrove umur 7 tahun dan kelimpahan terendah mangrove umur 50 tahun. Jenis larva udang penaeid yang paling banyak ditemukan adalah Penaeus 76,559%, sedangkan yang paling sedikit adalah Sicyonia 0,215%. Nilai indeks dominansi berkisar 0,371-0,523. Berdasarkan hasil uji multikolinieritas menunjukkan antara suhu, kecepatan arus, kecerahan dan salinitas memiliki hubungan korelasi kuat. Uji analisis regresi berganda menunjukkan antara suhu, kecepatan arus, kecerahan dengan kelimpahan larva udang penaeid berpengaruh positif, sedangkan salinitas dengan kelimpahan larva udang penaeid berpengaruh negatif. Kata Kunci : Ekosistem mangrove; Larva udang penaeid; Kelimpahan; Desa Pasar Banggi, Kabupaten Rembang ABSTRACTThe role of mangrove ecosystems as the breeding and feeding area for shrimp larvae can be used by farmers naturally. Therefore, the existence of penaeid shrimp larvae can provide information about the distribution of the larvae. The purpose of this study is to determine the type of penaeid shrimp larvae in the mangrove ecosystem, to determine the abundance and dominance of penaeid shrimp larvae and to determine the results of multicoliniearity test and multiple regression analysisof penaeid shrimp larvae in the mangrove ecosystem in Pasar Banggi Village, Rembang. The study was conducted on April-Mei 2016. The location of research consists of mangrove age of 50 years, mangrove age of 7 years and mangrove age of 3 years. The sampling technique for collecting the shrimp larvae is stratified sampling method. Penaeid shrimp larvae sampling was done by pushing scoop net as far as 50 meters, mesh size of 0.5 mm. Penaeid shrimp larvae type that were found during the researchare Sicyonia, Trachypenaeus, Xyphopenaeus, Penaeus and unidentified larvae. Larvae genus Trachypenaeus and Penaeus always appear in the all three areas, while the genus Sicyonia and Xyphopenaeus do not appear once in mangrove age of 7 years and mangrove age of 3 years. The highest abundance of penaeid shrimp larvae obtained during the study in mangrove age of 3 years followed mangrove age of 7 years and the lowest abundance in mangrove age of 50 years. Penaeid shrimp larvae type most commonly found are Penaeus 76.559%, while the least is Sicyonia 0.215%. Dominance index values ranged from 0.371 to 0.523. Based on the results of multi-coliniearity test, temperature, current speed, brightness and salinity have strong correlation. Multiple regression analysis showed that the relation between temperature, current speed, brightness with the abundance of penaeid shrimp larvae are positive, while the relation between salinity with the abundance of penaeid shrimp larvae is negative. Keywords :Mangrove ecosystem; Penaeid shrimp larvae; Abundance; Pasar Banggi Village, Rembang

scholarly journals Komposisi dan Kelimpahan Gastropoda Pada Ekosistem Mangrove Di Desa Tireman, Kabupaten Rembang, Jawa Tengah

2020 ◽  
Vol 9 (1) ◽  
pp. 41-48
Author(s):  
Yuli Laraswati ◽  
Nirwani Soenardjo ◽  
Wilis Ari Setyati
Keyword(s):  
Sampling Method ◽  
Random Distribution ◽  
Diversity Index ◽  
Distribution Patterns ◽  
Mangrove Ecosystem ◽  
Community Similarity ◽  
Purposive Sampling ◽  
Average Value ◽  
Central Java ◽  
Spread Pattern

Ekosistem mangrove mermiliki manfaat sebagai tempat mencari makan serta habitat bagi organisme, mislanya gastropoda. Gastropoda di ekosistem mangrove berperan dalam proses dekomposisi yaitu dengan mencacah daun menjadi lebih kecil, yang kemudian dilanjutkan oleh mikroorganisme. Kepadatan  gastropoda dipengaruhi oleh kegiatan yang terdapat pada ekosistem dan dapat memberikan efek pada kelangsungan hidup gastropoda.Tujuan penelitian adalah untuk mengetahui struktur komunitas gastropoda pada ekosistem mangrove Desa Tireman Kecamatan Rembang, Jawa Tengah. Metode penentuan lokasi sampling menggunakan metode purposive sampling pada 3 lokasi dengan kerapatan mangrove yang berbeda. Pengambilan sampel gastropoda dilakukan dalam transek 5 x 5m dan sampel yang didapat kemudan disortir, diawetkan dan diidentifikasi. Hasil penelitian ditemukan 9 spesies gastropoda termasuk kedalam 3 famili yaitu Casidula nucleus, C. aurisfelis (Ellobiidae), Littoraria scabra, L. carinifera, L. Melanostama (Littorinidae), Cerithidea quadrata, C. cingulata, C. alata, Telescopium telescopium (Potamididae). Spesies yang paling sering ditemukan adalah Cassidula aurisfelis dan Cassidula nucleus. Nilai rata-rata kelimpahan berkisar antara 6,28 - 15,72 Ind/m2. Nilai indeks keanekaragaman termasuk ke dalam kategori rendah hingga sedang. Nilai rata-rata indeks keseragaman termasuk kedalam kategori rendah (0.15-0.27). Nilai rata-rata indeks dominansi menunjukkan tidak adanya dominansi dari spesies tertentu. Pola sebaran menunjukkan pola sebaran mengelompok dan acak. Nilai kesamaan komunitas gastropoda tergolong dalam kategori tinggi. Frekuensi kehadiran gastropoda kategori jarang hingga sangat sering.  The mangrove ecosystem has benefits as a place to eat and habitat for the organism, the gastropod's missile. Gastropods in the mangrove ecosystem play a role in the decomposition process, with the smaller leaves, which are then followed by microorganisms. The density of gastropods is influenced by activities found in ecosystems and can provide an effect on the viability of gastropods. The purpose of research is to know the structure of the gastropods community in the mangrove ecosystem of Tireman Village Rembang District, Central Java. Sampling method of determining location using purposive sampling method in 3 locations with different mangrove density. The gastropod sampling is done in the 5 x 5m transect and the samples obtained are then sorted, preserved and identified. The results of the study found 9 species of gastropods included in the three families, namely Casidula nucleus, C. Aurisfelis (Ellobiidae), Littoraria scabra, L. Carinifera, L. Melanostama (Littorinidae), Cerithidea quadrata, C. cingulata, C. alata, Telescopium telescopium (Potamididae). The most commonly found species are the Cassidula aurisfelis and the Cassidula nucleus. The average value of abundance ranges between 6.28-15.72 Ind/m2. The value of diversity index belongs to low to moderate category. The average value of uniformity index is included in low category (0.15-0.27). The average value of the Dominancy index indicates the absence of dominance of a particular species. The spread pattern shows both group and random distribution patterns. The value of gastropods community similarity belongs to high category. The frequency of presence of gastropods is rare until very frequent.

scholarly journals Kepadatan Populasi Ikan Gelodok Di Hutan Mangrove Desa Penunggul Kecamatan Nguling Kabupaten Pasuruan

2020 ◽  
Vol 5 (2) ◽  
pp. 66-71
Author(s):  
Moch. Chasan Basri ◽  
Hari Santoso ◽  
Saimul Laili
Keyword(s):  
Environmental Conditions ◽  
Mangrove Forest ◽  
Sampling Method ◽  
Abiotic Factors ◽  
Mangrove Ecosystem ◽  
Northern Coast ◽  
Mangrove Forests ◽  
Purposive Sampling ◽  
Mangrove Area ◽  
The One

  Mangrove forests are the one of the coastal ecosystems; especially the northern coast and many are founded in the surrounding fish ecosystems. That organism is the one of the fauna which mangrove ecosystem constituent. The aim of this study was to determine the density and abundance of the population of Gelodok fish at mangrove areas in Penunggul Village, Nguling District. This study used a purposive sampling method from three stations and each station has three plots and three replications in each plot. The results showed that the density of frog fish in the mangrove forest area of ​​Nguling village at station 1 was 3 as well as at station 2 and 3 respectively 2 and 1. At station 1 there were three species, namely Baleopthalmus boddarti, Periopthalmus dipus, Periophthalmus Gracilis, station 2, there were two species; Baleopthalmus boddarti, Periophthalmus Gracilis, and station 3 there were three species namely Baleopthalmus boddarti, Periopthalmodon schlosseri, Periopthalmus dipus. The differences in the results of the study, environmental conditions and abiotic factors influence the density of fish in the mangrove area and at the station 1 the density is highe. Keywords: Gelodok fish, mangrove forest, population ABSTRAK Hutan mangrove merupakan salah satu ekosistem daerah pantai terutama pantai utara dan banyak di temui ikan Gelodok di sekitar ekositem ini. Organisme tersebut merupakan salah satu fauna penyusun ekositem mangrove. Tujuan penelitian ini untuk mengetahui kepadatan dan kemelimpahan populasi ikan Gelodok kawasan mangrove desa Penunggul Kecamatan Nguling. Penelitian ini menggunakan metode purposive sampling dari tiga stasiun dan setiap stasiun terdapat tiga plot dengan ulangan tiga kali dalam setiap plot. Hasil penelitian menunjukkan bahwa kepadatan ikan gelodok di kawasan hutan mangrove desa Nguling rata-rata pada stasiun 1 adalah 3, di satsiun 2; 2 dan 3; 1. Pada stasiun 1 terdapat tiga spesies yaitu Baleopthalmus boddarti, Periopthalmus dipus, Periophthalmus Gracilis , stasiun 2 terdapat dua spesies yaitu Baleopthalmus boddarti, Periophthalmus Gracilis dan stasiun 3 terdapat tiga spesies yaitu Baleopthalmus boddarti, Periopthalmodon schlosseri, Periopthalmus dipus. Perbedaan hasil penelitian, kondisi lingkungan dan faktor abiotik mempengaruhi kepadatan ikan Gelodok di kawasan mangrove, sehingga pada stasiun 1 diperoleh kepadatan  lebih tinggi. Kata kunci: ikan Gelodok, hutan mangrove, kepadatan populasi    

scholarly journals Keanekaragaman Jenis Plankton pada Akar dan Perairan Sekitar Mangrove Desa Lembar Selatan, Kabupaten Lombok Barat

2021 ◽  
Vol 1 (1) ◽  
pp. 1-8
Author(s):  
Ibadur Rahman ◽  
Chandrika Eka Larasati ◽  
Ayu Adhita Damayanti
Keyword(s):  
Sampling Method ◽  
Environmental Changes ◽  
Mangrove Ecosystem ◽  
Plankton Community ◽  
Purposive Sampling ◽  
Mangrove Area ◽  
Mangrove Ecosystems ◽  
Water Conditions ◽  
Mangrove Roots ◽  
Plankton Species

The mangrove ecosystem is one of the ecosystems in the estuary area that is unique and very sensitive to environmental changes. The large number of aquaculture businesses around Cemare Hamlet, West Lombok Regency have resulted in many mangrove areas being converted into pond cultivation locations. This will have an impact on the life of mangrove ecosystems such as plankton. This study aims to determine the abundance of plankton species around the mangrove area of ??Dusun Cemare, Sheet Selatan Village, West Lombok Regency. The research was conducted in May-October 2019 using a purposive sampling method by determining 7 stations to represent water conditions. Plankton analysis using the Lackey drop microtranscting method. The results showed that the mangrove ecosystem in Dusun Cemare was composed of 4 types, namely: Rhizophora sp., Avicenia sp., Bruguiera sp., And Soneratia sp. The plankton community in mangrove waters is composed of 13 types, while the abundance of plankton species (periphyton) attached to the mangrove roots consists of 6 types. The composition of plankton species which tends to be high indicates that the mangrove waters of Dusun Cemare are still feasible to sustain the survival of the associated biota in it.

THE EFFECT OF REPUTATION AND COMPETENCE ON CUSTOMER LOYALTY THROUGH CUSTOMER SATISFACTION

2020 ◽  
pp. 66-72
Author(s):  
Ari Dwi Astono ◽  
Widji Astuti ◽  
Harianto Respati
Keyword(s):  
Higher Education ◽  
Regression Analysis ◽  
Customer Satisfaction ◽  
Customer Loyalty ◽  
Sampling Method ◽  
Higher Education Institutions ◽  
Direct Influence ◽  
Tertiary Institutions ◽  
Central Java ◽  
Analysis Technique

This study aims to analyze the effect of reputation, competence on customer loyalty with customer satisfaction as an intervening variable. The population in this study were students of private tertiary institutions in Central Java who are members of Services for Higher Education Institutions Region VI, while a sample of 5 private universities, using the purposive sampling method, was taken with the Slovin formula of 190 respondents. The analysis technique uses regression analysis. Research results show the customer satisfaction variable can be an intervening variable or able to mediate between the direct influence of the reputation variable and the competency variable on customer loyalty variables.

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).

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