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Sofyan Husein Siregar
Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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Effect of Salinity Difference and Fertilizer Dose Walne against Chlorella sp Population Growth in Laboratory Scale Fathiya Hanifa; Syafruddin Nasution; Sofyan Husein Siregar
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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AbstrakChlorella sp is a single-celled plants that have a true nucleus, and relatively low-level plants. Chlorella sp also called the green algae and can live in freshwater and sea water. This research was conducted in January-February 2019, which is housed at the Institute of Aquaculture Seawater and Brackish Bungus Buo bay, Padang, West Sumatra. The purpose of this study to determine the effect of the combination of salinity and Walne different fertilizers on the growth of Chlorella sp population on a laboratory scale. result  This study shows that salinity combinations and dosages of different Walne influence on population growth Chlorella sp, The rate of growth (k) is the highest at the beginning of the growth that is the treatment with the growth rate (k) of 0.84 cells / hour. Relative growth rate of Chlorella sp showed increased growth in a relatively unstable. Specific growth rate that occurred during the growth phase showed that the population growth of Chlorella sp longest namely the treatment of A1B1 which the growth rate up to the 12th day. Keywords:Chlorella sp, Walne fertilizer, combination, salinity. 
RELATIONSHIP OF EPIPHELIC DIATOMS ABUNDANCE WITH NITRATE, PHOSPHATE AND SILICATE CONCENTRATIONS IN INTERTIDAL ZONE OF WATERS KUALA TANJUNG SEI SUKA SUBDISTRICTS BATU BARA REGENCY OF NORTH SUMATERA PROVINCE Nurhasanah Nurhasanah; Sofyan Husein Siregar; Irvina Nurrachmi
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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                                            ABSTRACT                                                                 Diatom are microscopic plants as primary producers for most marine biota. This research has been held on March 2018 in Intertidal Zone of waters Kuala Tanjung Sei Suka Subdistrict, Batu Bara Regency, North Sumatera Province. The purpose of this study was to determine the genera epiphelic diatom abundance of Nitrate, Phosphate and Silicate concentrations and to know relationship of epiphelic diatom abundance with concentrations of Nitrate, Phosphate and Silicate. Sediment samples was taken from 4 stations and each stations was divided based on the intertidal zone (lower, middle and upper). Sample identification was obtained from 4 genera of diatom centrales and 9 genera of diatom pennales. Epiphelic diatom abundance was found in each zone ranged from 343 - 5319 ind/cm2 and at each station ranged from 686 - 6634 ind/cm2. Nitrate concentrations ranged from 0.0125 - 0.0958 mg/l, Phosphate concentrations ranged from 0.1150 - 0.8385 mg/l, and the concentration of Silicates ranged from 0.1529 - 0.3301 mg/l. Simple linear regression analysis indicates a very low negative correlation between Nitrate with abundance the epiphelic diatom, a negative correlation between Phosphate with epiphelic diatom abundance and negative correlation between Silicate with epiphelic diatom.Keyword: Intertidal Zone, Epiphelic Diatoms, Nitrate, Phosphate and Silicate       
PENGARUH MINYAK MENTAH UBP LIRIK TERHADAP PERTUMBUHAN DEFOLIASI DAN BIOMASSA ANAKAN MANGROVE Bruguiera sexangula DI KELURAHAN PANGKALAN SESAI KOTA DUMAI Taufik Herman; Bintal Amin; Sofyan Husein Siregar
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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The research was conducted in October 2012-January 2013 to study thegrowth, defoliation and biomass of mangrove seedling of Bruguiera sexangula whichwas contaminated by crude oil in Pangkalan Sesai Village of Dumai in Riau Province.The research used experimental method by direct observation on the field. The resultsshowed that treatment with different concentrations of crude oil, gave a significantimpact to the growth, leaf number, height, defoliation and leaf biomass of mangroveseedlings. Increasing diameter, stem biomass and root biomass of Bruguiera sexangulawas, however, not impacted by crude oil. Higher crude oil concentration added to theseedling lowered the growth and gave higher defoliation in mangrove Bruguierasexangula seedling.Keywords : Dumai, Crude Oil, Biomass, Defoliation, Growth, Bruguiera sexangula
DENSITY AND DISTRIBUTION PATTERN OF SNAILS (Cerithidea quadrata) IN MANGROVE FOREST ANAK SETATAH VILLAGE KEPULAUAN MERANTI REGENCY OF RIAU PROVINCE by Fainal Asandi; Sofyan Husein Siregar; Syafruddin Nasution
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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ABSTRACTThis research was conducted in July 2018 at Anak Setatah Village, West Rangsang Sub-District, Kepulauan Meranti Regency of Riau Province.This study aims determine the density and the distribution patte of C. quadrata.The research used survey method. There were 3 stations chosen by purposive samplingmethod. Each station was made 100m line transect. Each transect consist of 4 plots measuring 3m x 3m with the distance was 25m between low and hing waters. Samples were analyzed in the biology laboratory of Marine Science Departemen Riau University. Result show that the highest density of the snailswas at station II (4.92 ind/m²) fallowed by stations III (2.25 ind/m²) while the  lowest density was at Stations I (1.3 ind/m²). There is a very strong relationship between organic sedimen content and density of C. quadrata( ). Keywords: Cerithidea quadrata, Distribution, Density, Mangrove, Anak Setatah
Abundance, Distribution Pattern and Sex Ratio of Kerang Lokan (Polymesoda expansa) in Mangrove Ecosystem of Liong River Estuary, Bantan District, Bengkalis Regency Yosua Afrianus P; Efriyeldi '; Sofyan Husein Siregar
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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This research was conducted on June 2015 in mangrove ecosystem of Liong River Estuary, Bantan District, Bengkalis Regency. The purpose of this research is to know abundance, distribution pattern and sex ratio of Lokan Bivalve (Polymesoda expansa). The method used was survey by observing, measuring and taking sample directly on research site. The research site was determined by purposive sampling which consisting of 3 stations, specified by mangrove densities. The result showed that average abundance were 0.44-1.66 ind/m2. The highest abundance was at Station 1 and the lowest was Station 3. The distribution pattern based on Morisita Index was aggregated. The sex ratio showed that difference among male and female at station 1 and 2, where the percentage of female was more dominating. While, sex ratio was balance on Station 3.Key words : Abundance, Sex Ratio, Distribution Pattern, Polymesoda expansa
ABUNDANCE OF EPIPHYTIC DIATOM IN RhizophoraCOVERED AND NOT COVERED BY PLASTIC IN PECINTA ALAM BAHARI DUMAI Lukman Harun; Sofyan Husein Siregar; Irvina Nurrachmi
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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 AbstractDiatoms are unicellular organisms from the Bacillariophiceae class, can be found as planktonic diatoms and benthic diatoms. This research was carried out in July 2018, in Pecinta Alam Bahari (PAB), Dumai Barat. This study aims to find out the type, distribution, and abundance of epiphytic diatoms in Rhizophora.The method use in this study was the survey method.Point sampling was determined by purposive sampling, each point sampling consists of 3 sub-sampling (trees). there are 9 types of epiphytic diatoms in mangrove Rhizophora sp. on roots covered and were not covered by plastic, it wasCoscinodiscus sp., Cyclotella sp., Isthmia sp., Melosira sp., Leptocylindrus sp., Stepanopixis sp., Gyrosigma sp., Navicula sp., and Synedra sp. The lowest total abundance of diatoms in the roots covered by plastic and those not covered by plastic is at the sampling point I, which is 689.28 ind/cm2and 1,132.40 ind/cm2. The highest diatom abundance in roots covered and not covered by plastic were at the sampling point III, which is 1,230.87 ind/cm2 and 1,477.04 ind/cm2. Based on the results of t-test obtained a significant value of< 0.05 i. e. 0,032 indicating the abundance of ephipythic diatoms was significantly different in the roots covered and not covered by plastic.Keywords : Diatom, Abundance, covered and not covered by plastic
RELATIONSHIP OF OIL CONTENT WITH EPIPELIC DIATOMS ABUDANCE IN INTERTIDAL SEDIMENT IN THE WATER OF TANJUNG BUTON SIAK DISTRICT RIAU PROVINCE Novi Permata Sari; Yusni Ikhwan Siregar; Sofyan Husein Siregar
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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A study on the effect of oil content on the epipelic diatom abundance weredone in march 2016 at Tanjung Buton intertidal. Three station were estabelishedare three replicades in calloting water as well as sediment sample. The analysis,identification and quantification of oil content and diatom abundance were carriedout in Marine Chemistry Laboratory and Marine Biology Laboratory, Faculty ofFisheries and Marine Science, University of Riau in Pekanbaru. It showed that oilcontent large apparentle the highest station 2 (1.224,10 ppm) and the lowest wasat station 1 (150,30 ppm). The highest abundance epipelic diatom of was found atstation 3 (15.752,33 Ind/cm2) and the lowest abundance was found at station 2(8.893,09 Ind/cm2). Epipelic diatom that were found in the water around theTanjung Buton Siak District Riau Province composing of 19 spesies. Rhizosoleniasp was the species with the highest abundance in all station. The epipelic diatomabundance was found to be during at different zone was in upper zone (15.313,65Ind/cm2), middle zone (13.638,73 Ind/cm2) and lower zone (11.325,72 Ind/cm2).Relationships between oil content with epipelic diatom abundance in TanjungButon Waters were y = -3,963x + 15.486, R2 = 0,400, r = 0,632. The oil contentand epipelic diatom abundance was negative correlation, which means in creasingof oil content will cause a decrease the abundance of epipelic diatom at TanjungButon waters.Keywords: Tanjung Buton Waters, Oil Content, Epipelic Diatom, Rhizosolenia sp
MOLLUSCA AND ARTHROPODA ABUDANCE IN THE ECOSYSTEM AREA OF MANGROVE SUNGAITOHOR VILLAGE KEPULAUAN MERANTI REGENCY, RIAU PROVINCE Said Nazman Arif; Joko Samiaji; Sofyan Husein Siregar
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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ABSTRACT  This research was conducted in November 2017 - April 2018 in the ecosystem area of mangrove Sungaitohor Village, Kepulauan Meranti Regency, Riau Province. The aim of the study was to determine the type and abundance of molluscs and arthropods, as well as the species diversity index (H'), uniformity index (E) and dominance index (C) of molluscs and arthropods. The method used was a survey method consisting of 3 stations with transect perpendicular to the coastline. The number of molluscs and arthropods at the study area was 10 species, consisting of 8 species the Molluscs and 2 other species from Arthropods phylum. The average abundance of molluscs and arthropods ranged from 2,11 x 104 – 4,00 x 104  ind/ha and the abundance of molluscs and arthropods between stations was significantly different (P < 0.01). The average Diversity Index (H') was 3.0628 indicating high diversity; the average Dominance Index (C) was 0.1333 indicating that no spesies dominates the site. The Diversity Index (E) was 0.9367 indicating the uniformity of organisms in a balanced state and there was no competition for  places or foods.  Keywords: abundance, molluscs and arthropods, mangrove ecosystem, meranti
PHYTOPLANKTON COMMUNITY STRUCTURE POTENTIALLY ASHARMFUL ALGAL BLOOM (HAB) IN THE WATERS OF PARIAMAN CITY Nila Sari Lubis; Sofyan Husein Siregar; Irvina Nurrachmi
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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 ABSTRACT This research was conducted in Januari 2019 in the waters of Pariaman City. The  purposeof  this  researchwastodeterminethewatersquality, composition, abundance, the structure of phytoplankton community, and to know the correlation (nitrate and phosphate) with the  abundance of phytoplankton  potentially as HAB in Pariaman City waters. This research using a survey method. Location is determined by purposive sampling.The Results of measurements of waters quality parametersshow that temperature29,50-30,75 0C, current speed 0,01-0,07 m/s, brightness 0,86-1,50 m, salinity 28,50-30,50 ppt, pH 7,25-7,50, nitrate concentration 0,0672-0,1010 mg/l andphosphate0,0248-0,0343 mg/l.Totaltypes of phytoplanktonwhich was found 29 species namelyThalassionema sp, Rhizosolenia sp, Pleurosigma sp, Chaetoceros sp, Nitzschia sp, Thalassiosira sp, Lauderia sp, Thalassiothrix sp, Coscinodiscus sp, Bacteriastrum sp, Hemiaulus sp, Guinardia sp, Bacillaria sp, Tabellaria sp, Ceratium sp, Triceratium sp, Pseudo-nitzschia sp, Fragilaria sp, Campylodiscus sp,Ditylum sp, Pyrophacus sp, Pyrocystis sp, Amphisolenia sp, Dinophysis sp, Oscillatoria sp, Trichodesmium sp, Rivularia sp, Licmophora sp, Dictyocha sp. The result of diversity index is 3,37-3,68, dominance indexis 0,11-0,13 anduniformity indexis 0,73-0,77. The average value of phytoplanktonis 68,75x103-190,2x103 sel/m3, that cause the potential for HAB in Pariaman City waters isvery small.The relative abundance of phytoplankton types the potentialHAB isThalassionema sp. The results of linear regression analysisproduce a positive linear relationship with the equation y = 28,905+1388,8x (Nitrate) y = 34,758+3553,5x (phosphate) and the strength of the relationship is classified as strong. Keyword :Phytoplankton, HAB (Harmful Algal Bloom), Abundance, Pariaman
Community Stucture of Epiphytic Diatoms on Seagrass Leaves of Enhalus acoroides in Jago-Jago Coastal Waters of Tapanuli Tengah North Sumatera Province Bornok Silalahi; Sofyan Husein Siregar; Zulkifli &#039;
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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This research was conducted in March 2015 in the coastal waters of the village of Jago-Jago Central Tapanuli, North Sumatra. The aim of this research was to know the community structure of epiphytic diatom which include the type and abundance, diversity, uniformity and epiphytic diatom dominance contained in the leaves of Enhalus acoroides and to know the characteristics of the diatom habitat includes water quality parameters that affect the existence of epiphytic diatoms. Data were obtained by direct observation, measurement and sampling in the field followed by the identification of the type (species) of epiphytic diatom at the Marine Biological Laboratory, University of Riau. The results showed Total epiphytic diatoms found were 30 genera. The highest abundance of diatoms were Nitzschia and Skeletonoma that were recorded in station III. This genus has high adaptability pitch on the environment so that it can grow and develop properly. Diatom abundance of epiphytes on the leave base, middle and tip of the station I ranged from 31.093 to 71.035 ind/cm2, in the station II ranged from 59.093 to 92.855 ind/cm2 and at stations III ranged from 33.562 to 82.460 ind/cm2. The highest abundance of epiphytic diatoms was found in station II, ie 75.013 ind/cm2, while the lowest abundance was found in station I, 48.935 ind/cm2. The value of diversity index (H '), dominance index (D) and uniformity index (E), concluded that quality was diversity of species were, no species dominated and water quality was still in favorable condition to support the life of epiphytic diatoms.Key Words: Community Structure, Epiphytic Diatoms, Enhalus acoroides, TapanuliTengah
Co-Authors ', Thamrin ', Zulkifli AA Sudharmawan, AA Achmad Mulyadi Adam Dionfriski Ade Riccard Simatupang Adriana, Alysa Adrizal, Taufik Afrizal Tanjung Albahri Albahri Alvin Natali Andi Darlianto Anisaldi Anisaldi Anita, Sofia Antoni Antoni Aras Mulyadi Ardhi Yusuf Ardian Dwi Pratama Ardiansyah Hamid Arief Mubyarso Aslim Rasyad Asmika Harnalin Simarmata Bahri S, Aswan Bahtiar Denny Edison Belilasari Belilasari Belilasari, Belilasari Beranda, Ongki Okto Bintal Amin Bornok Silalahi Chairun Nisa Chitra Hermawan Chitra Hermawan Dalimunthe, Salmi Patima Dellarosa, Wiranda Deni Efizon Desmarina, Y. Despela, Despela Dessy Yoswati Dessy Yoswaty Devid Joehari Dewi Marni Dinda Trie K Hayati Dinda Trie K Hayati Dionfriski, Adam Dodik Ridho Nurrochmat Dudi Candra Eddy Handoko Edmond Edwar Efriyeldi, Efriyeldi Elda Nazriati Elizal, Elizal Endah Julita Eva Desy Yulina Siregar, Eva Desy Yulina Fainal Asandi Fairuzia, Putri Marwah Farid Febrianda Fathiya Hanifa Fauzan, M. Febbyolla, Selfi Anidal Febrianda, Farid Fery, Rony andes Gendraya Rohaini Ginting, T.B. Hamid, Ardiansyah Hanif, Naufal Happy Rosalina Hapsoh Hapsoh Hapzi Ali Henny Daniaty I Gusti Wayan Murjana Yasa Imam Suprayogi Ira Putra, Ira Irvina Nurachmi Jamhari Jamhari Jasril Jasril Joenathan Sarumpaet Joko Samiaji Josua Simanjuntak, Josua Lazuardi, Andika Lucky Rahman Lydia S Marpaung M. Hambali M. Hambali Manda Putra, Ridwan Marpauang, EkoRinaldi Masykur HZ Masykur Hz Megawati Hari Dwi Jayanti Mery Mery Mia Audina Mia Audina, Mia Miduk Tampubolon Mila Rosa Miswadi Miswadi Mubarak Mubarak Mubarak Mubarak Muchlis Muchlis Muchlis Muchlis Mudinillah, Adam Mufidah, Marhamah Nurul Muhammad Saroha Lubis Muhammad, Andi Syahroni Mumin Rifai Musrifin Galib Nickson Panjaitan Nila Sari Lubis Nizar Rofiki Nova Esterlita Novi Permata Sari Noviawati Riza Nugraha, Rafiq Prima Nur Arifin Nur Arifin, Nur Nurhapida Nurhapida Nurliya &#039; Octavia Lorensa Br Sinaga Prasiska, Yulia Puspita, Sarah Putri Wahyuni Rahmita, R. Ramadhan, A.R Rasoel Hamidy Renata, Vivien Ridwan Manda Putra Rifardi Rinaldo, Rinaldo Rinaldo, Rinaldo Rini, Yulia Sapta Riski Hambali Risqiana Dani Riza Yuliani Rizka Aprisanti Rizka Aprisanti Rizki, A. Rosa, Mila Rulen, Betty Nia Rusadi, M Dio Eigmar S.Pd. M Kes I Ketut Sudiana . Said Nazman Arif Samsir Samsir Sari, D.J. Selfi Anidal Febbyolla Selvia, Seli Shofian Nanda Adiprayoga Silaban, Santi Maria Sinaga, Octavia Lorensa Br Sirait, Juliper Parasian Sitindoan, Benni Mario K. Sofia Anita Sujianto Sujianto Sujianto Sukendi Sukendi Susiyanti. N Sutami Sutami Sutrisna Sutrisna suwondo suwondo Syafruddin Nasution Syafrudin Nasution Syahril Nedi Taufik Herman Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Trinop Sagiarti TRINOP SAGIARTI, TRINOP Trisla Warningsih Vivien Renata Wahyudi Wahyudi Wahyuni, Weni Indah Windarti Windarti Wiranda Dellarosa Yanasari, Nurry Yanti, D.H. Yosua Afrianus P Yudha Januarizki Setiawan Yulia Prasiska Yuliani, Riza Yusni Ikhwan Siregar Zahtamal Zahtamal Zientika, Zientika Zukarnaini Zukarnaini Zulfan Saam Zulkifli &#039; Zulkifli Zulkifli