bluuebunny/crossref_metadata_2025 huggingface dataset:
Tingkat Herbivori Daun Mangrove Avicennia marina (Forssk.) Vierh. Dan Rhizophora mucronata Di Desa Kaliwlingi, Kecamatan Brebes, Kabupaten Brebes, Jawa Tengah
Authors: Widayanti Eva Widayanti , Soenardjo Nirwani Soenardjo , Ario Raden Ario
Published: July 2021

Herbivori pada daun mangrove merupakan salah satu faktor penyebab berkurangnya luasan daun mangrove sehingga daerah fotosintesis menjadi berkurang dan akan mempengaruhi kondisi tanaman mangrove secara keseluruhan. Tujuan dari penelitian ini yaitu mengetahui tingkat herbivori daun Avicennia marina dan Rhizophora mucronata berdasarkan spesies, umur daun dan tinggi pohon di Desa Kaliwlingi, Kecamatan Brebes, Kabupaten Brebes. Penelitian ini dilakukan pada bulan Juni–Desember 2018. Metode yang digunakan dalam penelitian ini adalah metode deskriptif, sedangkan dalam penentuan lokasi pengambilan sampel dilakukan dengan metode purposive. Sampel daun dari spesies Avicennia marina dan Rhizophora mucronata diambil dari tiga kategori tinggi tanaman yang berbeda, yaitu: <1 m, 1–<3 m, dan 3–5 m, masing–masing sebanyak 10 pohon sebagai ulangan. Daun dipisahkan berdasarkan umur daun (muda dan tua) dan kondisi daun (utuh dan tua). Total daun yang diambil masing–masing 10% dari setiap pohon. Berdasarkan hasil penelitian, menunjukkan rerata nilai setiap spesies, umur daun dan tinggi pohon didapatkan tingkat herbivori pada A. marina yaitu 7,36% kisaran (0,10-29,36%) sampai dengan 13,26% kisaran (0,06-48,46%) sedangkan pada R. mucronata yaitu 5,93% kisaran (0,23-21,59%) sampai dengan 19,69% kisaran (1,10-47,06%).  Herbivory in mangrove leaves is one of the factors causing reduced area of mangrove leaves so that the photosynthetic area becomes reduced and will affect the condition of the mangrove as a whole. The research is aiming to find out the herbivory level of herbivory Avicennia marina and Rhizophora mucronata based on the species, age, and the tree-height in Kaliwlingi Village, Brebes District, Brebes. The research is conducted in June–December 2018. The methodology is descriptive method, while the sample location decided with purposive method. The leaf sample from Avicennia marina and Rhizophora mucronata is taken from three different high-categorized plants there are: <1 m, 1-<3 m and 3–5 m, with 10 trees for each categories as the repetition. The leaf differs based on the ages of leaf (young leaf and old leaf), and the completion of the leaf condition. It takes 10% from each trees in total. The result show the average value of each spesies, age and  the tree-height, it is obtained the herbivory level from A. marina is 7,36% in range (0,10-29,36%) till 13,36% in range (0,06-48,46%) while from R.mucronata is 5,93% in range (0,23-21, 59%) till 19,69% in range (1,10-47,06%).
Kajian Kelayakan Fisik Pantai Seribu Ranting Jepara Sebagai Kawasan Wisata Pantai
Authors: Novitasari Dyah Pitaloka , Pratikto Ibnu , Suryono Chrisna Adhi
Published: July 2021

Pantai Seribu Ranting terletak di Desa Panggung, Kecamatan Kedung, Kabupaten Jepara, Jawa Tengah. Pantai Seribu Ranting memiliki potensi alam yang dapat dikembangkan untuk kegiatan pariwisata. Tujuan penelitian ini untuk mengevaluasi kelayakan fisik Pantai Seribu Ranting sebagai kawasan wisata pantai di Kabupaten Jepara dengan mengkaji parameter fisik pantai dan analisis SWOT. Penelitian ini bermanfaat mengetahui kelayakan kawasan wisata Pantai Seribu Ranting sebagai kawasan wisata pantai. Penelitian dilakukan pada bulan Desember 2018 dengan metode purposive sampling. Hasil penelitian menunjukkan bahwa Pantai Seribu Ranting sesuai untuk kegiatan wisata pantai karena hasil pengukuran di stasiun 1, stasiun 2, dan stasiun 3 menunjukkan nilai IKW diatas 80%. Nilai IKW yang diperoleh tergolong dalam tingkat kesesuaian S1, walaupun terdapat beberapa parameter yang kurang mendukung seperti perairan yang terlalu keruh. Akan tetapi hal itu dapat disiasati dengan menonjolkan kelebihannya seperti pasir putih, pantai yang landai, dan tidak adanya biota berbahaya. Analisis SWOT di Pantai Seribu Ranting menghasilkan tiga prioritas utama, yaitu: Memanfaatkan kondisi alam yang ada untuk menambah daya tarik wisata, membuat atraksi eduwisata tambak garam, dan membuat arena olahraga pantai. Seribu Ranting Beach is located in Panggung Village, Kedung Subdistrict, Jepara, Central Java. Seribu Ranting Beach have natural potential that can be developed for ecotourism. The purpose of this research is to evaluate the physical advisability of Seribu Ranting Beach as a beach tourism area in Jepara by studying the physical parameters of the beach and SWOT analysis. The advantage of this research is to know the advisability of ecotourism in Seribu Ranting Beach as beach tourism. The research has been carried out in December 2018 with a purposive sampling method. The results showed that Seribu Ranting Beach is suitable for beach tourism activities because the measurement results at station 1, 2, and 3 showed that IKW values are above 80%. The IKW values that have been obtained are classified as a level of S1 suitability, although there are some parameters that are less supportive like turbid water and a lot of garbage. However, this can be dealt by highlighting its advantages such as white sand, sloping beaches, and the absence of dangerous biota. The SWOT analysis on Seribu Ranting Beach produced three main priorities, namely: utilizing existing natural conditions to increase tourist attraction, making edutourism attractions of salt ponds, and creating a beach sports arena.
Ekologi Mangrove Di Pesisir Kecamatan Tongas Dan Sumberasih Kabupaten Probolinggo, Jawa Timur
Authors: Wijaya Dyah , Suryono Suryono , Soenardjo Nirwani
Published: July 2021

Komunitas mangrove menempati area diantara darat dan laut yang memiliki kondisi lingkungan berbeda satu sama lain. Tujuan penelitian ini untuk mengetahui struktur vegetasi mangrove dan mengetahui kesesuaian jenis mangrove yang sesuai untuk perencanaan program rehabilitasi mangrove di Desa Bayeman Kecamatan Tongas dan Desa Pesisir Kecamatan Sumberasih Kabupaten Probolinggo. Penelitian dilakukan pada Bulan Maret 2015 sampai Januari 2016. Pengambilan data vegetasi dilakukan dengan metode purposive sampling dan setiap transek dibuat plot sampling. Setiap individu pohon (plot 10 m x 10 m) dan sapling (anakan) (subplot 5 m x 5 m) diidentifikasi dan diukur diameternya setinggi dada (±1,3 m). Sementara seedling (semai) dihitung jumlah masing-masing spesies dan persentase penutupannya (subplot 1 m x 1 m). Hasil penelitian di Desa Bayeman ditemukan 7 spesies mangrove dan 1 jenis spesies di Desa Pesisir. Vegetasi pohon mangrove di Desa Bayeman dan Desa Pesisir berada dalam kondisi baik. Vegetasi Mangrove di Desa Bayeman didominasi spesies Xylocarpus mollucensis dan untuk Desa Pesisir adalah Avicennia marina. Vegetation mangrove occupy the area between land and sea that have environmental conditions differ from one another. The purpose of this studied to know about the structure and composition of mangrove vegetation for rehabilitation program planning in Bayeman Sub-District of. Tongas and Pesisir Sub-Districk Sumberasih, District of Probolinggo , East Java. The studied was conducted in March, 2015 to January, 2016. Vegetation data was done with purposive sampling method and every transect was made with plot sampling method. Each tree (plot 10 m x 10 m) and sapling (subplot 5 m x 5 m) was identified and measured on diameter at breast height (± 1.3 m).  Meanwhile, Seedling calculated the amount of each species and the percentage of cover (subplot 1 m x 1 m). The research finding at Bayeman shows that there are seven mangroves and one mangrove shows in Pesisir. The mangrove vegetation at Bayeman and Pesisir in good conditions. Mangrove vegetation at Bayeman is dominated by Xylocarpus mollucensis and Mangrove vegetation at Pesisir is dominated Avicennia marina .
Korelasi antara Kelimpahan Kepiting dengan Kerapatan Mangrove di Desa Bedono Kecamatan Sayung Kabupaten Demak Jawa Tengah
Authors: Ristiyanto Ardi , Djunaedi Ali , Suryono Chrisna Adhi
Published: July 2021

ABSTRAK : Hutan mangrove memiliki fungsi ekologis sebagai tempat pemijahan (spawning ground), asuhan (nursery ground), dan mencari makan (feeding ground). Tujuan dalam penelitian ini yaitu untuk mengetahui korelasi antara kelimpahan kepiting dengan kerapatan mangrove di ekosistem mangrove Desa Bedono, Kecamatan Sayung, Kabupaten Demak. Penelitian ini bersifat deskriptif eksploratif dengan pengambilan sampel menggunakan metode kualitatif dan penentuan lokasi sampling menggunakan purposive sampling method. Lokasi penelitian dibagi menjadi tiga stasiun yaitu A (Mangrove dekat muara), B (Tracking mangrove), C (Mangrove dekat Tambak). Sampel diambil dari plot sampling 5 m x 5 m dengan tiga kali pengulangan dan tiga waktu pengulangan di setiap stasiunnya. Hasil penelitian ini ditemukan 7 jenis kepiting yang termasuk ke dalam 4 famili, diantaranya adalah Ocypodidae (Uca vocans dan Uca coarctata), Grapsidae (Metoporgapsus latifrons dan Episesarma lafondi), Varunidae (Metaplax elegans dan Pseudograpsus albus) dan Sesarmidae (Parasesarma rutilimanum). Korelasi antara kelimpahan kepiting dengan kerapatan mangrove menunjukkan bahwa semakin tinggi nilai kerapatan mangrove maka semakin tinggi juga nilai kelimpahan kepiting. Nilai kelimpahan kepiting tertinggi terdapat di stasiun A (27633 ind/ha) dan kelimpahan terendah terdapat pada stasiun B (3833 ind/ha). ABSTRACT : Mangrove forests have ecological functions as a spawning ground, nursery ground, and feeding ground. The purpose of this study is to determine the correlation of an abundance of crabs with the density of mangroves in the mangrove ecosystems of Bedono Village, Sayung District, Demak Regency. This research was descriptive explorative with sampling using qualitative methods and determining sampling locations using a purposive sampling method. The research location is divided into three stations, namely A (Mangrove near the estuary), B (Tracking mangrove), C (Mangrove near the Pond). Samples were taken from a sampling plot of 5 m x 5 m with three repetitions and three repetitions of each station. The results of this study found 7 types of crabs belonging to 4 families, including Ocypodidae (Uca vocans and Uca coarctata), Grapsidae (Metoporgapsus latifrons and Episesarma lafondi), Varunidae (Metaplax elegans and Pseudograpsus albus) and Sesarmidae (Parasesarma rutilimanum). The correlation of the abundance of crabs with mangrove density shows that the higher the value of mangrove density, the higher the abundance of crabs. The highest value of crab abundance was found in station A (27633 ind/ha) and the lowest abundance was found at station B (3833 ind/ha).
Tingkat Herbivori Daun Mangrove Rhizopora mucronata dan Rhizophora apiculata Hasil Replantasi di Ujung Piring, Kabupaten Jepara
Authors: Widianto Nur Cahyo , Pribadi Rudhi , Pratikto Ibnu
Published: July 2021

Tujuan dari penelitian ini untuk mengetahui tingkat herbivori R. apiculata dan R. mucronata, dan ketinggian pohon serta umur daun di vegetasi mangrove Di daerah Ujung Piring, Kabupaten Jepara. Metode yang digunakan dalam penelitian ini adalah metode deskriptif yaitu metode pencari fakta dengan interpretasi secara tepat, penentuan lokasi pengambilan sampel dilakukan dengan metode purposive sampling. Sampel daun mangrove dari spesies R. apiculata dan R. mucronata diambil dari tiga kategori ketinggian yang berbeda yaitu <1 m dan >1-3 m, masing-masing sebanyak 10 ulangan (pohon) untuk setiap kategori. Daun dipisahkan berdasarkan umur daun (tua atau muda) serta kondisi daun (utuh atau rusak) total daun diambil sebanyak 10%. Hasil penelitian menunjukan nilai rerata tingkat herbivori R. apiculata yaitu 4,66% kisaran (0,16% - 8,93%) sampai dengan 11,59% kisaran (2,14-21,97%) sedangkan pada R. mucronata yaitu 5,23% kisaran (0,31-9,94%) sampai dengan 11,37% kisaran (2,56-17,91%). Berdasarkan uji statistik dapat disimpulkan bahwa faktor spesies, ketinggian dan umur daun berpengaruh nyata terhadap tingkat herbivori pada kedua spesies R. apiculata dan R. mucronata yaitu: (P<0,05). The purpose of this research is to know the herbivory level of R. apiculata and R. mucronata, the tree height and the age of the leaves in mangrove vegetation Dusun Ujung Piring, Jepara District. The method used in this research is descriptive method and that means fact finding method with the correct interpretation, in determining the location of the sampling is done by purposive sampling method. Samples of mangrove leaves from the R. apiculata and R. mucronata species were taken from three different height categories: <1 m and > 1-3, each of 10 replicates (trees) for each category. Leaves are separated by the age of the leaves (old or young) and leaf condition (whole or damaged) leaves in total are taken as much as 10%. The results showed that the average value of herbivory level of R. apiculata was 4,66% (0,16-8,93%) up to 11,59% (2,14-21,97%) while in R. mucronata 5,23% (0,31-9,94%) up to 11,37% (2,56-17,91%). Based on statistical test it can be concluded that species factor, height and leaf age have a real impact on the herbivory level on R. apiculata and R. mucronata.
Tutupan Terumbu Karang di Pulau Lirang Kabupaten Maluku Barat Daya
Authors: Nusaputro Kurnia Adi , Redjeki Sri , Susilo Endang Sri
Published: July 2021

Penelitian mengenai persentase tutupan substrat pada perairan terumbu karang ini dilakukan di Pulau Lirang Kabupaten Maluku Barat Daya. Penelitian yang dilakukan di perairan Pulau Lirang bertujuan untuk mengetahui persentase tutupan substrat di perairan tersebut. Pengumpulan data dilakukan bulan April 2016 pada enam lokasi dengan transek sepanjang 100 meter. Data dihimpun dengan menggunakan metode Point Intersept Transect (PIT) menggunakan peralatan SCUBA. Hasil penelitian menunjukkan rerata tutupan karang hidup di Pulau Lirang, Maluku Barat Daya adalah 33,75%, dengan tutupan tertinggi pada stasiun VI (54%). Kematian karang yang mencapai 48% di stasiun V diduga disebabkan oleh persaingan dengan soft coral atau biota bentik lainnya, arus dan sedimentasi. Dominasi karang Acropora, foliose dan massive di perairan Pulau Lirang dapat diartikan masih terjadinya kesetimbangan ekosistem terumbu karang di perairan tersebut, dimana Acropora sebagai indikator percepatan pertumbuhan dan pemulihan, karang foliose menandakan ketahanan akan kerusakan fisik seperti arus dan gelombang dan karang massive sebagai indikator ketahanan perubahan iklim global. Research on the percentage of substrate cover on coral reef waters was conducted in Lirang island, Southwest Maluku Regency. The aim of this research was to determine the percentage of substrate cover in the waters. Data collection was conducted in April 2016, in six locations with 100 m long transect for each location. The data was collected using Point Intercept Transect (PIT) method using SCUBA equipment. The result showed that average live coral cover in Lirang Island waters, Southwest Maluku is 33,75%, with the highest coral cover at Station VI (54%). The exsisting coral mortality at Station V (48%) was assumed because of competition with soft corals or other benthic biota, and sedimentation. The domination of the coral life form Acropora, Foliose, and Massive in Lirang island waters indicated that the ecosystem balance in these area was still maintained. The existence of Acropora life form is an indicator of accelerated growth and recovery, while foliose life form is an indicator of durability and physical damage from current and wave. Lastly, massive coral life form is an indicator of resistance to climate change.
Biologi Rajungan Portunus pelagicus Linnaeus, 1758 (Crustacea: Portunidae) Ditinjau Dari Aspek Distribusi Ukuran Dan Parameter Pertumbuhan Di Perairan Rembang, Jawa Tengah
Authors: Wibowo Nathanael Ganang Anindityo , Suryono Chrisna Adhi , Pratikto Ibnu
Published: July 2021

Rembang merupakan salah satu kabupaten di Jawa Tengah yang dikenal sebagai daerah penghasil sumberdaya rajungan yang cukup tinggi permintaannya dan terus meningkat setiap tahunnya. Hal tersebut dapat menyebabkan terjadinya penurunan potensi hasil rajungan akibat intensifnya penangkapan di Perairan Rembang. Kajian tentang kondisi stok sumberdaya rajungan  terkait sebaran dan dinamika populasi ini sangat diperlukan dalam pengelolaan potensi rajungan. Tujuan dari penelitian ini adalah untuk menganalisis struktur ukuran dan parameter pertumbuhan rajungan di Perairan Rembang. Penelitian ini dilaksanakan pada bulan Maret – Juni 2019 di Perairan Rembang, dengan menggunakan metode survei yang bersifat deskriptif. Total sampel rajungan selama penelitian adalah 1200 ekor yang terdiri dari 574 ekor jantan dan 624 ekor betina. Hasil penelitian menunjukkan kelas ukuran lebar karapas rajungan didominasi oleh rajungan muda, dengan rata – rata 105.01 ± 11.99 mm untuk jantan dan 107.73 ± 10.68 untuk betina. Berat rata – rata rajungan jantan yaitu sebesar 95.2 ± 27.1 gram dan rajungan betina sebesar 97.9 ± 23.1 gram, sehingga menunjukkan rajungan jantan lebih kecil dibandingkan dengan rajungan betina. Pola pertumbuhan rajungan di Perairan Rembang bersifat allometrik negatif. Laju pertumbuhan rajungan di Perairan Rembang yang didapatkan adalah berupa nilai panjang asimptotik (L∞) sebesar 71.4 mm dengan koefisien pertumbuhan (K) sebesar 1.5/tahun.Rembang is a coastal region in Central Java which known as to producer of blue swimming crab resources that are in high demand and continues to increase every year. It will because decreasing the potential yield of blue swimming crab due to intensive fishing in Rembang Waters. Study on the stock condition of the blue swimming crab resource related to the distribution and dynamics of the population is required for the management of the blue swimming crab potential. The current research aims to assess the size structure and growth parameter of blue swimming crab in the Rembang Waters. The research was conducted from March to June 2019 in Rembang Waters, using a descriptive survey method. The total number of crab samples during the study was 1200 animals consisting of 574 male and 624 female. The results showed that the size of the crab carapace width class was dominated by young crabs, with an average of 105.01 ± 11.99 mm for males and 107.73 ± 10.68 for females. The average weight of male crab is 95.2 ± 27.1 gram and female crab is 97.9 ± 23.1 gram, indicates that male crab is smaller than female crab. The crab’s growth in Rembang Waters is allometric negative. The growth rate of crab in the Rembang Waters obtained is in the form of asymptotic length (L∞) was 71.4 mm with a growth coefficient (K) 1.5/year.
Analisis Sebaran Lebar Karapas dan Proporsi Rajungan Betina Bertelur yang Tertangkap di Perairan Demak
Authors: Pradana Henrian Rizki , Nuraini Ria Azizah Tri , Redjeki Sri
Published: July 2021

ABSTRAK : Rajungan merupakan komoditas perikanan bernilai ekonomis penting dan memiliki nilai komersial yang cukup tinggi. Salah satu desa yang memproduksi rajungan adalah Desa Betahwalang. Sebagian besar rajungan hasil tangkapan di perairan Betahwalang dikirim untuk di ekspor ke luar negeri. Tingginya permintaan pasar terhadap komoditas perikanan rajungan memicu eksploitasi yang berlebihan sehingga dapat berdampak terhadap kelestarian sumber daya rajungan. Tujuan penelitian ini adalah untuk menganalisis sebaran lebar karapas dan proporsi EBF (egg berried female) rajungan di Desa Betahwalang, Demak terkait dengan upaya pengelolaan rajungan secara berkelanjutan sesuai dengan Peraturan Menteri Kelautan dan Perikanan no. 1 tahun 2015. Penelitian ini dilaksanakan pada bulan Februari – Maret 2019 di Desa Betahwalang, Demak menggunakan metode random sampling. Pengukuran rajungan dilakukan di bakul yang ada di Desa Betahwalang, Demak. Hasil penelitian menunjukkan bahwa 1003 ekor rajungan (83%) yang tertangkap berukuran >10 cm dari total 1203 rajungan tertangkap. Nisbah kelamin di Desa Betahwalang menunjukkan bahwa antara jantan dan betina seimbang (1:1,06). Sedangkan untuk betina bertelur yang tertangkap (EBF) berjumlah 81 ekor rajungan (13%). ABSTRACT : Blue Swimming Crab is one of fisheries commodity with highly important economical and commerce value. One of the village that produce blue crab is Betahwalang. Most of the crabs are exported. With high demand of blue crab resulting in over exploitation that affects the population of blue crab. The purpose of this research is to analyze the spread of carapace width and the proportion of EBF (Egg Berried Female of the blue swimming crab in Desa Betahwalang, Demak that are related with the continuous management effort of blue crab consistent with Peraturan Menteri Kelautan dan Perikanan No 1 Tahun 2015. This research was conducted on February – March 2019 at Desa Betahwalang, Demak using random sampling method. The measurement of blue crab was done on the buyer at Desa Betahwalang, Demak. The results show that 1003 blue crab (83%) that were caught had carapace width more than 10 cm from 1203 blue crab caught. The ratio of male and female crab show that male and female were equal (1:1,06). For the egg berried female (EBF) that were caught shows 81 blue crab caught (13%).
Analisis Daya Dukung Kualitas Air Untuk Kesesuaian Wisata Di Pantai Karang Jahe, Rembang
Authors: Kurniawati Fitri , Pratikto Ibnu , Widianingsih Widianingsih
Published: July 2021

Pantai Karang Jahe merupakan salah satu destinasi wisata baru yang mulai  menjadi tujuan wisata  di Jawa Tengah. Sebagai tempat wisata  baru, Pantai Karang Jahe memerlukan pengembangan dalam upaya menarik wisatawan untuk berkunjung. Penelitian ini bertujuan untuk mengkaji kesesuaian dan daya dukung wisata  serta  mengkaji potensi daya tarik wisata Pantai Karang Jahe, Rembang, Jawa Tengah. Penelitian dilaksanakan pada bulan Januari-Februari 2019. Penelitian menggunakan metode survei dan penentuan lokasi dipilih dengan menggunakan metode purposive sampling,. Pada Penelitian ini dilakukan analisa Indek Kesesuaian Wisata (IKW)  dan analisa Daya Dukung Kawasan (DKK).  analisis data kesesuaian kawasan menggunakan rumus IKW= [ Ni / Nmaks] x 100 % dan analisis daya dukung kawasan Bertdasarkan pengamatan diperoleh hasil bahwa nilai IKW untuk rekreasi pantai pada stasiun 1, 2 dan 3 tergolong sangat sesuai (S1) dengan nilai 88,88%; 91,94%; 84,72%.  Nilai Daya Dukung Kawasan (DDK) yaitu kegiatan rekreasi pantai dengan luas 1200 m2 sebesar 96 orang/ hari, kegiatan berenang dengan luas 1100 m2 dapat menampung 88 orang/ hari, dan kegiatan bermain dengan luas 1000 m2 dapat menampung 80 orang/ hari. Berdasarkan hasil  analisa IKW dan DDK dapat disimpulkan bahwa  Pantai Karang Jahe sangat sesuai untuk kegiatan wisata pantai. Karang Jahe Beach is one of the new tourist destinations that is starting to become a tourist destination in Central Java. As a new tourist spot, Karang Jahe Beach requires development in an effort to attract tourists to visit. This study aims to examine the suitability and carrying capacity of tourism and examine the potential of the tourist attraction of Karang Jahe Beach, Rembang, Central Java. The study was conducted in January-February 2019. The study used a survey method and the location was chosen using the purposive sampling method. In this study an analysis of the Tourism Suitability Index (IKW) and the Regional Carrying Capacity (DKK) analysis were conducted. Based on observations, the results show that the IKW value for beach recreation at stations 1, 2 and 3 is classified as very suitable (S1) with a value of 88.88%; 91.94%; 84.72%. The carrying capacity of the Region (DDK) is beach recreation activities with an area of 1200 m2 totaling 96 people / day, swimming activities with an area of 1100 m2 can accommodate 88 people / day, and play activities with an area of 1000 m2 can accommodate 80 people / day. Based on the results of IKW and DDK analysis, it can be concluded that Karang Ginger Beach is very suitable for beach tourism activities.
Aplikasi Citra Sentinel-2 untuk Pemetaan Sebaran Material Padatan Tersuspensi Di Muara Sungai Wulan Demak
Authors: Prasetiyo Bayu Adi , Rochaddi Baskoro , Satriadi Alfi
Published: July 2021

ABSTRAK : Sungai Wulan yang terletak di Kabupaten Demak digunakan masyarakat sebagai jalur keluar dan masuknya kapal nelayan serta saluran pembuangan utama. Hal tersebut berdampak pada besarnya kandungan material padatan tersuspensi yang terdapat pada sungai. Pengamatan sebaran material padatan tersuspensi dibutuhkan untuk mengetahui pola sedimentasi dan penilaian kualitas air. Tujuan dari penelitian ini adalah untuk mengetahui sebaran material padatan tersuspensi di muara Sungai Wulan menggunakan metode pengindraan jauh. Data yang digunakan dalam penelitian ini adalah citra satelit Sentinel-2 dan konsentrasi material padatan tersuspensi hasil uji gravimetri. Pengolahan data menggunakan algoritma Lemigas (1997), Budhiman (2004), Parwati (2006), Laili (2015) dan Metode Regresi (Linear, Eksponensial dan Logaritmik). Hasil analisis data menunjukkan bahwa konsentrasi material padatan tersuspensi di sekitar muara relatif rendah, sedangkan konsentrasi yang tinggi terdapat di arah timur muara sungai atau di daerah yang berupa teluk. Algoritma yang memiliki nilai error terkecil adalah algoritma Metode Regresi dengan MRE sebesar 10,12% dengan nilai RMSE sebesar 4,3493. Berdasarkan hasil yang didapat, dapat disimpulkan jika algoritma Metode Regresi merupakan algoritma yang paling sesuai untuk pemetaan sebaran material padatan tersuspensi di muara Sungai Wulan, Demak. ABSTRACT : The Wulan River which located in Demak Regency is used by people as an entrance point for fishing boats and the main sewers. These have an impact on the amount of total suspended solid contained in the river. Observation about the distribution of total suspended solid is needed to determine sedimentation patterns and water quality assessments. The purpose of this study is to determine the distribution of total suspended solid at the Wulan River estuary using remote sensing method. The data used in this study is Sentinel-2 satellite imagery and the concentration of total suspended solid from gravimetric test. Processing data using Lemigas algorithm (1997), Budhiman (2004), Parwati (2006), Laili (2015) and Regression Method (Linear, Exponential and Logarithm). The results of data analysis show that the total suspended solids distribution at the estuary is relatively low, while the high consentration of total suspended solid is found at the east of the river estuary or in the area that form a bay. Algorithm that has the smallest error value is the regression algorithm with MRE value is 10.12% and RMSE value is 4.3493. Based on the results obtained, it can be concluded that the algorithm with regression method is the most suitable algorithm for mapping the distribution of total suspended solid at the mouth of the Wulan River, Demak.
Analisis Parameter Fisika dan Kimia Karaginan Kappaphycus alvarezii Doty 1985 (Florideophyceae : Solieriaceae) Dengan Variasi Ekstraksi dari Perairan Bluto
Authors: Wulandari Nursiana Suci , Pramesti Rini , Susanto AB.
Published: July 2021

Kappaphycus alvarezii merupakan rumput laut merah penghasil karaginan yang dimanfaatkan dalam berbagai industri dan diperoleh melalui ekstraksi. Ekstraksi umumnya menggunakan larutan alkali sebagai pelarut dalam proses pemanasan maupun perendaman. Ekstraksi tanpa larutan alkali masih jarang dilakukan. Ekstraksi cara alkali, non-alkali maupun pre-treatment alkali mempengaruhi kualitas karaginan sehingga penelitian ini perlu dilakukan. Tujuan penelitian untuk memperoleh karaginan kualitas terbaik dari 3 metode ekstraksi. Parameter yang diambil meliputi rendemen, kadar air, kadar abu, kekuatan gel, viskositas dan analisis FTIR. Karaginan dihasilkan melalui ekstraksi secara alkali dengan pemanasan KOH, pre-treatment alkali dengan perendaman KOH sebelum pemanasan dan ekstraksi native pemanasan dengan air suling. Hasil penelitian didapatkan nilai rendemen terbaik dengan metode alkali (36,68±2,33%). Kadar air terbaik metode pre-treatment (3,91±0,84%). Kadar abu terbaik metode alkali (32,7±2,42%). Kekuatan gel terbaik dengan metode alkali (519±29,01g/cm2). Viskositas terbaik metode native (70,43±0,74 cPs). Hasil FTIR menunjukkan sampel yang dihasilkan jenis kappa karaginan. Kappaphycus alvarezii produces carrageenan which is widely used for industrial and obtained through extraction. Generally the extraction is using an alkaline solution as a solvent of heating or soaking process. Extraction without alkaline solution is infrequently performed. Different extraction methods affect the quality of the carrageenan, therefore the research has to be done. The purpose of this research is to obtain the best quality carrageenan from 3 different extraction methods. The parameters performed yield, water content, ash content, gel strength, viscosity and FTIR analysis. Carrageenan are produced through alkaline extraction treatment with KOH, pre-treatment alkaline with KOH and native extraction with distilled water. The results showed the best yield was alkaline method (36.68±2.33%), the best water content was pre-treatment method (3.91±0.84%), the best ash content was the alkaline method (32.7±2.42%), the best gel strength was the alkaline method (519 ± 29.01g/cm2), the best viscosity was the native method (70.43±0.74 cPs). Analysis FTIR showed the samples produced kappa carrageenan.
Simpanan Karbon Enhalus acoroides LF. Royle 1839 (Angiosperms: Hydrocharitaceae) di Pantai Gelaman dan Pantai Alang-Alang, Karimunjawa Jepara
Authors: Ratnasari Viny , Djunaedi Ali , Santoso Adi
Published: July 2021

ABSTRAK: Perubahan iklim disebabkan oleh berbagai aktifitas kegiatan manusia yang menghasilkan gas karbon diokasida ke atmosfer bumi yang akan berdampak pada pemanasan global. Ekosistem padang lamun memiliki kemampuan untuk menyerap dan menyimpan karbon dalam jumlah besar dari atmosfer yang dapat mengurangi emisi karbon. Tujuan penelitian ini untuk mengetahui kerapatan, tutupan lamun, biomassa dan simpanan karbon pada lamun Enhalus acoroides di Pantai Gelaman dan Pantai Alang-Alang. Penelitian menggunakan metode survei dan penentuan lokasi dipilih dengan menggunakan metode line transect quadrant yang mengacu pada metode LIPI. Sampling dilakukan pada titik 50 m setiap substasiun dengan metode pencuplikan. Pengukuran karbon pada sampel lamun menggunakan metode LOI.Kerapatan lamun di Stasiun 1 sebesar 1235 ind/m2 dan nilai tutupan lamun sebesar 68,76%. Kerapatan Stasiun 2 sebesar 1135 ind/m2 dan tutupan lamun sebesar 51,78%. Nilai rata-rata estimasi simpanan karbon lamun Enhalus acoroides di Stasiun 1sebesar 119.27 gC/m2 dan di Stasiun 2 sebesar 91.57 gC/m2. ABSTRACT: Climate change is caused by various human activities that produce carbon dioxide gas into the earth atmosphere which will have an impact on global warming. Seagrass ecosystem is able to absorb and store large number of carbon from the atmosphere that can reduce carbon emissions. This research were to determine the density, seagrass cover, biomass and carbon storage in seagrasses at Gelaman Beach (Station 1) and Alang-Alang Beach (Station 2). Survey and sampling. Were conducted using quadrant transect referring to LIPI method. Observation of the density value, the percentage of seagrass coverage was conducted in all points, while the sampling was conducted at the point 50 m on each substation by sampling method. Carbon measurement in seagrass sample used LOI method. Total seagrass density in Station 1 was 1235 ind/m2 and the total value of seagrass percentage cover was 68,76%. Total seagrass density in Station 2 was 1135 ind/m2 and total value of seagrass percentage cover was 51,78%. Average value for carbon savings estimated seagrass Enhalus acoroides in Station 1 was 119.27 gC/m2 and Station 2 was 91.57 gC/m2.
Studi Morfometrik Kepiting Bakau (Scylla serrate) Forsskål, 1775 (Malacostraca : Portunidae) di Kecamatan Wedung, Demak, Jawa Tengah
Authors: Panatar Jakfar Shodiq , Djunaedi Ali , Redjeki Sri
Published: July 2021

ABSTRAK : Kepiting bakau (Scylla serrata) adalah jenis kepiting yang hidup di perairan pantai, tambak, dan hutan bakau (mangrove). Kepiting bakau (Scylla serrata) merupakan komoditas ekspor bernilai ekonomis tinggi yang sangat potensial untuk dikembangkan dan memiliki nilai ekonomis yang tinggi di Indonesia, terutama kepiting yang sudah dewasa serta gemuk. Tujuan penelitian ini adalah untuk mengetahui karakteristik morfometrik kepiting bakau (Scylla serrata) seperti kelimpahan relatif kepiting bakau (Scylla serrata), distribusi lebar karapas, dan hubungan lebar karapas – berat kepiting bakau (Scylla serrata). Analisis yang digunakan dalam penelitian ini yaitu kelimpahan realatif kepiting dan analisis regresi. Penelitian ini dilaksanakan pada bulan Februari – April 2019 di Kecamatan Wedung, Demak. Materi yang digunakan pada penelitian ini adalah sampel kepiting bakau (Scylla serrata) hasil tangkapan nelayan di daerah tersebut. Kepiting bakau hasil tangkapan nelayan tersebut dihitung jumlahnya, diidentifikasi jenis kelaminnya, diukur lebar karapas dan ditimbang beratnya.  Hasil penelitian menunjukkan bahwa Kepiting bakau (Scylla serrata) yang tertangkap pada bulan Februari – April 2019 diperoleh 300 individu yang terdiri dari 202 jantan dan 98 betina. Rata – rata ukuran lebar karapas tertinggi berkisar 9.8 cm pada hasil tangkapan di bulan Februari. Hubungan lebar karapas – berat Kepiting bakau (Scylla serrata) baik jantan maupun betina menunjukkan pola pertumbuhan allometrik negatif. ABSTRACT : Giant mud crab (Scylla serrata) are types of crabs that live in coastal waters, ponds, and mangrove forests. Giant mud crab (Scylla serrata) is a high economic value export commodity that has the potential to be developed and has high economic value in Indonesia, especially crabs that are mature and fat. The purpose of this study was to determine the morphometric characteristics of giant mud crab (Scylla serrata) such as relative abundance of giant mud crab (Scylla serrata), carapace width distribution, and the relationship between carapace width - weight of giant mud crab (Scylla serrata). The analysis used in this study is the relative abundance of giant mud crab and regression analysis. This research was conducted in February - April 2019 in the subdistrict of Wedung, Demak. The material used in this study was a sample of giant mud crab (Scylla serrata) from the fishermen catch in the area. The giant mud crab captured by the fishermen are counted, identified by sex, measured in carapace width and weighed. The results showed that giant mud crab (Scylla serrata) caught in February - April 2019 obtained 300 individuals consisting of 202 males and 98 females. The highest average carapace width ranges from 9.8 cm in catches in February. Relationship between carapace and weight of giant mud crab (Scylla serrata) both male and female showed negative allometric growth patterns.
Sebaran Fosfor Anorganik Partikulat (PIP) di Muara Sungai Banjir Kanal Barat Semarang
Authors: Tarigan Natalia Jelita , Rochaddi Baskoro , Subardjo Petrus , Maslukah Lilik
Published: July 2021

Muara Sungai Banjir Kanal Barat Semarang merupakan wilayah yang berpotensi mengalami eutrofikasi akibat buangan limbah rumah tangga dan industri. Sebagian besar penelitian sebelumnya lebih berfokus pada fosfor dalam sedimen dasar dan fosfat terlarut, sedangkan kandungan fosfor anorganik dalam total suspended solid (TSS) di perairan muara dan laut menerima lebih sedikit perhatian. Tujuan dari penelitian ini adalah mengetahui sebaran fosfor anorganik partikulat (PIP) di perairan sekitar muara Sungai Banjir Kanal Barat Semarang. Pengambilan sampel dilakukan pada lapisan permukaan (kedalaman 0,5 m). Analisis TSS dilakukan dengan metode gravimetri. Ekstraksi asam PIP dilakukan berdasarkan metodologi ekstraksi konvensional, menggunakan 1 M HCl, diikuti oleh prosedur untuk menurunkan keasaman dan dianalisis dengan metode spectrophotometric phosphomolybdenum blue pada panjang gelombang 880 nm. Konsentrasi PIP yang didapatkan berkisar antara 0,42 µmol/g – 1,28 µmol/g dengan nilai rata-rata sebesar 0,54 µmol/g. Sebaran PIP dipengaruhi oleh arus pasang surut, total suspended solid (TSS) dan salinitas. Sebaran PIP dominan ke arah barat – barat laut karena pengaruh arus pada saat pasang menuju surut. Konsentrasi PIP menurun seiring berkurangnya konsentrasi TSS dan meningkatnya nilai salinitas. Banjir Kanal Barat estuary is an area that has the potential to experience eutrophication due to household and industrial waste disposal. Most previous research has focused more on phosphorus in basic sediments and dissolved phosphate, whereas the inorganic phosphorus content in total suspended solid (TSS) in estuarine and marine waters received less attention. The purpose of this study was to determine the distribution of particulate inorganic phosphorus (PIP) in the waters around the Banjir Kanal Barat estuary. Sampling was carried out on the surface layer (0.5 m depth). TSS analysis was performed using the gravimetric method. PIP acid extraction was carried out based on conventional extraction methodology, which required 1 M HCl, followed by a procedure to reduce acidity and analyzed by spectrophotometric phosphomolybdate blue method at a wavelength of 880 nm. PIP concentrations obtained ranged from 0,42 µmol/g – 1,28 µmol/g with an average value of 0.54 µmol/g. Distribution of PIP is influenced by tidal currents, total suspended solid (TSS) and salinity. Distribution of PIP is dominant to west – northwest direction due to the influence of currents at ebb current. PIP concentration decreases with decreasing TSS concentration and increasing salinity.
Varied shoot growth in rice plants across different developmental stages under induced flooding
Authors: Samanta Pratyasha , Chakrabarti Abhra , Dey Narottam
Published: July 2021

All the modern high yielding rice varieties precariously respond to flooding, although a number of landraces are tolerant to wide range of flooding with penalty of low yield. Stage-specific flood tolerance experiment was performed at three different conditions for three different growth stages from germination to vegetative stage for five such selected landraces, along with a flood-resistant quiescent variety (FR13A), a sensitive line (IR42), an improved cultivar (Swarna) and one Sub1 loci introgressed improved line (Swarna-Sub1). Different morpho-physiological traits at each stage were observed and genotypes were evaluated by these quantifiable traits to understand their underwater performance. All the studied landraces represented strong seed germination and faster coleoptile elongation than FR13A, Swarna and Swarna-Sub1 under water. At early seedling stage var. Kumrogarh embraced with highest number of seedlings with leaves and extended greater leaf portion above the water. Shoot elongation associated with internodal and petiole/blade elongation and well developed aerenchyma tissue facilitated vegetative tissues to survive. In this stage, Kumrogarh had highest plant height but Bakui had highest internodal length which indicated that kumrogarh might have the greater leaf sheath or blade elongation up to day 21 and also smaller increase (%) in air cavity formation at day 21 which made the stem to be upright devoid of lodging. All these results indicated that the studied landraces are the potential resources for submergence avoiding response for all the stages and should be elaborately investigated for future breeding programme. The rice line kumrogarh may be one of the potent traditional rice which can withstand all sorts of submergence by virtue of all the stage-specific attributes under submergence stress.
Chemical components of volatile oil and fatty acids of wild Bunium persicum (Boiss.) B. Fedtsch. and cultivated Cuminum cyminum L. populations
Authors: SOLTANBEIGI Amir , DIRAMAN Harun , HASSANPOURAGHDAM Mohammad Bagher
Published: July 2021

Volatile oil and fatty acids components of six various populations of wild Bunium persicum Boiss. (Bam and Zirkuh/Iran) and cultivated Cuminum cyminum L. (Rayen/Iran; Cukurcak, Taskopru and Asagialicomak/Turkey) species were investigated. The volatile oil content of Bam and Zirkuh populations were 3.9 and 4.7 %, respectively. The analysis of volatile oils by the GC/FID-MSD showed that γ-terpinene (33.62-39.62 %), cuminal (17.9-19.3 %), o-cymene (5.3-11.1 %), benzenemethanol, α-methyl- (7.4-9.5 %), 1-phenyl-1-butanol (6.4-8.4 %) and limonene (6.4-8.6 %) were the major components of B. persicum populations. Rayen, Cukurcak, Taskopru and Asagialicomak populations of C. cyminum had 2.6, 2.2, 2.0 and 2.5 % of volatile oil, respectively. Cuminal (22.8-37.6 %), benzenemethanol, α-methyl- (5.3-22.6 %), γ-terpinene (16.7-19.4 %), β-pinene (11.2-11.9 %) and 1-phenyl-1-butanol (5.4-12.5 %) were identified as the main components of C. cyminum. Fatty acids were detected by the GC/FID. In total, 15 fatty acids were characterised in B. persicum populations from Iran. Petroselinic acid (26.3-52.6 %), lauric acid (16.2-37.0 %) and linoleic acid (18.3-33.0 %) were the predominant fatty acids identified in Iranian populations. C. cyminum populations were rich in the same fatty acids but, the order was: petroselinic acid (47.5-55.5 %), linoleic acid (22.5-25.4 %) and lauric acid (13.4-24.2 %). Monounsaturated fatty acids (27.4-56.2 %) were the major subgroup. Overall, B. persicum populations from Iran and C. cyminum from Turkey were almost similar in fatty acids profile although they had wide diversity in the volatile oils compositional profile.
Analysis of energy balance and global warming potential in tangerine (Citrus tangerina Tanaka) orchards versus soybean (Glycine max (L.) Merr.) production system
Authors: HOSSEINI Seyed Saeed , FEIZI Hassan , KAVEH Hamed , SAHABI Hossein
Published: July 2021

With the aim of evaluation and comparison of the greenhouse gas emissions from soybean and tangerine production in Golestan province, Iran, a pilot experiment was carried out. In this experiment, 43 fields of soybeans and 43 orchard tangerines were selected by various management in the province using questionnaires. The greenhouse gas emissions were examined using the Global Warming Potential (GWP). The results of this study showed that fossil fuel was the highest energy consumption in the production of soybeans (6906.5 MJ ha-1) and tangerines (17205.1 MJ ha-1). The lowest amount of energy consumption among inputs was related to micro fertilizers, that was 9 MJ ha-1 for soybeans and 17.6 MJ ha-1 for tangerine. In both of production system, the most energy consumed was shown for the harvesting sector. Irrigation and planting were the highest contributors to greenhouse gas emissions in soybean field by 387.7 and 109.4 kg CO2 ha-1, respectively; while in the tangerine production, the most greenhouse gas emissions were related to irrigation and harvesting process by 5828.4 and 394.7 kg CO2 ha-1. In general, input energy in soybean and tangerine were 17512.8 and 33879.8 MJ ha-1, total output energy was calculated 48310.5 and 105463 MJ ha-1. Finally, the energy use efficiency was computed for soybean and tangerine 2.9 and 3.3, respectively.
Synthesis of a synthetic analogue for the Sitophilus weevil aggregation pheromone and study on its hygienic and toxicological indexes
Authors: SHAKIRZYANOVA Gulnara , ROMANOVA Liliya , BABAEV Bahrom , АBDUKACHAROV Vladimir , ISKANDAROV Tulkun , GAYIBOVA Sabina
Published: July 2021

The work was initiated to study hygienic and toxicological indices of a synthetic analogue for the Sitophilus weevil aggregation pheromone. The toxicity testing of 5-hydroxy-4-methyl-3-heptanone demonstrated its extremely low toxicity for the warm-blood animals, as compared to the one of the typical pesticides. The average lethal dose of the product per orally administered to the white mice was established to be 4375.0 mg kg-1 LD16 and LD84 being 2225.0 mg kg-1 and 6550.0 mg kg-1, respectively. The average lethal dose for rabbits was 5900.0 mg kg-1 5-hydroxy-4-methyl-3-heptanone proved to have a mild skin and conjunctival irritant action, and equally mild functional cumulation. As to chronic toxicity, the acceptable daily dose of 4.3 mg/person/d was calculated and scientifically substantiated. The odor threshold was determined at the dose ranging from 0.35 to 0.7 mg l-1 with the practical limit ranging from 0.35 to 1.5 mg l-1, taste sensation threshold was found at the dose ranging from 1.0 to 3.0 mg l-1 with the practical limit ranging from 3.0 to 7.0 mg l-1
Nutrition and Covid-19 epidemic
Authors: PAJK ŽONTAR Tanja , VIDRIH Rajko
Published: July 2021

Proper nutrition is an essential part of an individual’s defence against numerous diseases including coronavirus disease SARS-CoV-2 (Covid-19). Nutritional status of individual is affected by several factors such as age, sex, health status, physical activity, life style and medications. Optimal nutrition and dietary nutrient intake impact the immune system, therefore the sustainable way to survive in current context is to strengthen the immune system. Inadequate intake of energy, protein, and specific micronutrients are associated with depressed immune function and increased susceptibility to infection. Predominantly vital for the encouraging of immune function are elements selenium, iron and zinc and vitamins A, D, C, E, B6, B9 (folate) and B12 as well as omega-3 polyunsaturated fatty acids. Thus, during this time it is important to take care of nutritional habits, following a healthy and balanced nutritional pattern containing a high amount of elements, antioxidants and vitamins. It is also recommended, that individuals should be mindful of physical activity, known to be associated with all-cause mortality. Regular physical activity also improves mental health and overall feelings of wellbeing. Thus, now in the time of epidemic, more than ever, wider access to healthy foods should be a top priority for governments around the world
Maize seedling emergence in response to climatic variability in a tropical rainforest area
Authors: FAYOSE Chris Adegoke , FAKOREDE Morakinyo Abiodun Bamidele
Published: July 2021

Environmental factors causing low seedling emergence often observed in tropical maize (Zea mays L.) are poorly documented. This study was conducted to investigate the effects of weather factors on maize seedling emergence at the Obafemi Awolowo University Teaching and Research Farm (OAU TRF). Five maize varieties sown weekly, in 3-replicate RCBD experiments throughout the 2016 and 2017 cropping seasons, were used to monitor emergence percentage (E %), emergence index (EI) and emergence rate index (ERI). Climatic data were obtained from the automatic weather station located on the farm. Analysis of variance revealed highly significant (P ≤ 0.01) environmental effect for all traits. Soil moisture (Sm), relative humidity, air temperature, heat unit and soil heat flux (SHF) showed significant (P ≤ 0.05) correlation coefficients with all traits, but there was no relationship between the emergence traits and grain yield. Stepwise multiple regression and sequential path coefficient analyses indicated that increased Sm, rather than rainfall per se, increased the speed of emergence. Minimum air temperature and SHF with direct effects, and heat unit with indirect effect, negatively affected emergence the most. Relatively low Tmin and SHF, along with just enough Sm maximized seedling emergence in the rainforest agro-ecology of southwestern Nigeria.