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JURNAL PESISIR DAN LAUT TROPIS
Published by Universitas Sam Ratulangi
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Core Subject : Science,
Earth & Planetary Sciences
Jurnal Pesisir dan Laut Tropis mewadahi kajian-kajian ilmiah dalam bidang bio-ekologi pesisir dan laut, hidro-oesanografi dan morfologi pesisir, toksikologi dan farmasitika, kajian substansi kimiawi biota dan perkembangan bioteknologi kelautan lainnya, di lingkup pesisir dan laut di daerah tropis. Kajian ilmiah dimaksud bisa berupa hasil penelitian maupun critical review. Jurnal ini terbit 3 (tiga) kali dalam satu tahun (Februari, Juni, September). Diterbitkan oleh Program Studi Ilmu Kelautan FPIK-UNSRAT
Arjuna Subject : -
Articles 358 Documents
 32   33   34   35   36 
Analysis of Carotenoid and Chlorophyll Pigment Content in Seagrass from Mangket Beach Waters, Kema District, North Minahasa Natasya Tiranda; Desy M. H. Mantiri; Darus Sa’adah J. Paransa; Joice R.T.S.L. Rimper; Nickson J. Kawung; Markus Talintukan Lasut
JURNAL PESISIR DAN LAUT TROPIS Vol. 13 No. 3 (2025): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.13.3.2025.64842

Abstract

Seagrass is a flowering plant (Angiospermae) that can live in shallow waters and has an important role in marine ecosystems. Seagrass ecosystems are coastal ecosystems with high biological productivity and play an important role in ecological functions in coastal areas. Seagrass carries out photosynthesis with pigments as light-capturing organs. Pigments are biochromes that have activity as natural dyes and are widely used in the pharmaceutical, cosmetic, and food industries. Pigments contain bioactive compounds that have antibacterial, anticancer, antibiotic, and antioxidant activities. This study was conducted to determine the content of carotenoid and chlorophyll pigments in several types of seagrass found from Mangket Beach Waters, Kema District, North Minahasa. The methods used in this study were the maceration method, Thin Layer Chromatography (TLC) Separation and UV-Vis spectrophotometer wavelength absorption. The results showed that the seagrass Enhalus acoroides was identified as containing chlorophyll a, zeaxanthin, and chlorophyll b pigments. In the seagrass species Halophila ovalis, it was identified as containing β-cryptosanthin and chlorophyll b pigments, while in the seagrass species Thalassia hemprichii, it was identified as containing apo-β-carotene, diadinoxanthin, and chlorophyll b pigments. Keywords: pigments, Enhalus acoroides, Halophila ovalis, Thalassia hemprichii, Mangket beach, TLC,  UV-Vis spectrophotometer.   Abstrak Lamun merupakan tumbuhan berbunga (Angiospermae) yang dapat hidup di perairan dangkal dan memiliki peran penting dalam ekosistem laut. Ekosistem lamun merupakan ekosistem pesisir dengan produktivitas biologis yang tinggi dan berperan penting dalam fungsi ekologis di lingkungan wilayah pesisir. Lamun melakukan proses fotosintesis dengan pigmen sebagai organ penangkap cahaya. Pigmen merupakan biokrom yang memiliki aktivitas sebagai pewarna alami dan banyak digunakan dalam industri farmasi, kosmetik, dan makanan. Pigmen mengandung senyawa bioaktif yang memiliki aktivitas antibakteri, antikanker, antibiotik, dan antioksidan. Penelitian ini dilakukan untuk mengetahui kandungan pigmen karotenoid dan klorofil pada beberapa jenis lamun yang ditemukan dari Perairan Pantai Mangket, Kecamatan Kema, Minahasa Utara. Metode yang digunakan dalam penelitian ini yaitu metode maserasi, Pemisahan kromatografi Lapis Tipis (KLT) dan Serapan panjang gelombang spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa lamun Enhalus acoroides diidentifikasi mengandung pigmen klorofil a, zeaxanthin, dan klorofil b. Pada lamun jenis Halophila ovalis diidentifikasi mengandung pigmen β-kriptosanthin, dan klorofil b sedangkan pada lamun jenis Thalassia hemprichii diidentifikasi mengandung pigmen apo-β-karoten, diadinoxanthin, tipe klorofil b. Kata kunci: pigmen, Enhalus acoroides, Halophila ovalis, Thalassia hemprichii, pantai Mangket, KLT, sektrofotometer UV-Vis
Ethanol Extraction from Fresh Algae (Gracilaria sp) Using Various Concentrations of Hydrochloric Acid Solution in The Hydrolysis Process Putri E. Malinti; Grevo S. Gerung; Natalia D.C. Rumampuk; Markus T. Lasut; Nickson J. Kawung; Esther D. Angkouw
JURNAL PESISIR DAN LAUT TROPIS Vol. 13 No. 3 (2025): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.13.3.2025.64852

Abstract

Bioethanol is ethanol obtained through the fermentation of biomass rich in starch or cellulose from plant materials. Gracilaria sp. algae is one potential biomass source because it contains 54.4% galactan and 19.7% cellulose. This content makes it a promising alternative raw material for bioethanol production. Until now, there has been no scientific report related to ethanol extraction from Gracilaria sp. originating from the waters of Gunung Kidul, Yogyakarta. This study aims to: (1) determine the presence of ethanol in Gracilaria sp.; (2) measure the volume of ethanol from distillation; and (3) test ethanol qualitatively using potassium dichromate and sulfuric acid reagents. The research procedures include sample preparation, hydrolysis with HCl of various concentrations (0.5–2 M), fermentation using Fermipan yeast, urea, EM4, and NaOH (pH 4), and fermentation for 5 days. Distillation was carried out at a temperature of 78–80°C and the results were tested qualitatively by a color change from orange to blue as an indicator of ethanol. The results showed that Gracilaria sp. can produce ethanol, and the qualitative test method used has proven effective, simple, and economical. Further research is recommended to improve the purity and efficiency of bioethanol production from Gracilaria sp. Keywords: algae, bioethanol, Gracilaria sp., ethanol, qualitative ethanol analysis.   Abstrak Bioetanol adalah etanol yang diperoleh melalui fermentasi biomassa yang kaya akan pati atau selulosa dari bahan nabati. Alga Gracilaria sp. merupakan salah satu sumber biomassa potensial karena mengandung 54,4% galaktan dan 19,7% selulosa. Kandungan ini menjadikannya bahan baku alternatif yang menjanjikan untuk produksi bioetanol. Hingga kini, belum ada laporan ilmiah terkait ekstraksi etanol dari Gracilaria sp. yang berasal dari perairan Gunung Kidul, Yogyakarta. Penelitian ini bertujuan untuk mengetahui keberadaan etanol dalam Gracilaria sp. mengukur volume etanol hasil distilasi,dan menguji etanol secara kualitatif menggunakan pereaksi kalium dikromat dan asam sulfat. Prosedur penelitian meliputi persiapan sampel, hidrolisis dengan HCl berbagai konsentrasi (0,5–2 M), fermentasi menggunakan ragi Fermipan, urea, EM4, dan NaOH (pH 4), serta fermentasi selama 5 hari. Distilasi dilakukan pada suhu 78–80°C dan hasilnya diuji kualitatif dengan perubahan warna dari oranye ke biru sebagai indikator etanol. Hasil menunjukkan bahwa Gracilaria sp. dapat menghasilkan etanol dan metode uji kualitatif yang digunakan terbukti efektif, sederhana, dan ekonomis. Penelitian lanjutan disarankan untuk meningkatkan kemurnian dan efisiensi produksi bioetanol dari Gracilaria sp Kata kunci: alga, bioetanol, Gracilaria sp, Etanol, analisis kualitatif etanol
Density and Distribution Pattern of Red Algae Hypnea valentiae (Turner) Montague, Gametophyte and Tetrasporophyte in Tongkaina Waters, North Sulawesi and its Biomass Deislie R.H. Kumampung; Erly Kaligis
JURNAL PESISIR DAN LAUT TROPIS Vol. 13 No. 3 (2025): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.13.3.2025.64853

Abstract

Research on red algae Hypnea valentiae has been conducted to determine the density and distribution pattern of individual  male gametophyte, female gametophyte and tetrasporophyte in Tongkaina waters. As well as its biomass. Sampling was carried out using five transect lines and five 100 cm x 100 cm squares placed along the transect lines. To determine the individual male and female gametophytes and tetrasporophytes, observations were made under a microscope.  The results showed that the density of male gametophytes was 0.6 ind/m2, females gametophyte  3.36 ind/m2 and tetrasporophytes 0.72 ind/m2. All Hypnea valentiae gametophyte and tetrasporophyte individuals had a clustered distribution pattern with the wet weight of male gametophyte thallus ranging from 0.11 - 2.53 grams, females ranging from 0.23 - 4.19 grams, tetrasporophytes 0.48 - 2.07 grams. The dry weight of male gametophytes was 0.06 - 0.39 grams, females 0.03 - 0.49 grams, and tetrasporophytes 0.05 - 0.25 grams.Keywords :  Hypnea valentiae gametophyte tetrasorophyte, Density, biomass   Abstrak Penelitian mengenai alga merah Hypnea valentiae  telah dilakukan  untuk mengetahui  kepadatan, dan pola penyebaran individu gametofit jantan, betina dan tetrasporofit di perairan Tongkaina. serta biomassanya. Pengambilan sampel menggunakan 5 buah garis transek dan kuadrat berukuran 100 cm X 100 cm sebanyak lima buah yang diletakkan sepanjang garis transek. Untuk penentuan individu tumbuhan gametofit jantan dan betina serta tetrasporofit dilakukan pengamatan di bawah mikroskop. Hasil penelitian menunjukkan bahwa kepadatan gametofit jantan adalah 0,6 ind/m2, betina 3,36 ind/m2 dan tetrasporotif yaitu 0,72 ind/m2. Semua individu Hypnea valentiae gametifit dan tetrasporofit mempunyai pola penyebaran mengelompok dengan ukuran berat basah thalus gametofit jantan berkisar antara 0,11 - 2,53 gram, betina berkisar 0,23 - 4,19 gram, tetrasporotit 0,48 - 2,07 gram.  Berat kering gametofit jantan adalah 0,06 - 0,39 gram, betina 0,03 - 0,49 gram, dan tetrasporofit adalah 0,05 - 0,25 gram. Alga ini berpotensi besar untuk dimanfaatkan lebih lanjut semaksimal mungkin. Kata kunci: Hypnea valentiae gametofit, tetrasorofit, kepadatan, biomassa
Condition of Seagrass Meadows in The Waters Around The Sunrise Tourist Area, Makalisung Village, Kombi District, Minahasa Regency Baso, Fathan; Wagey, Billy T.; Sondak, Calvyn F. A.; Ginting, Elvy L.; Tilaar, Sandra O.; Rampengan, Royke M.
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.65793

Abstract

Seagrass is a flowering plant (magnoliopyta). Seagrass requires a minimum light intensity of $11% - 25%$ for photosynthesis, and disturbances can reduce the availability of light. Research in the Sunrise Tourism Area, Makalisung Village, aims to identify the types and conditions of seagrass meadows, considering the pressure from human activities such as garbage disposal and fishing boat traffic. The data collection method uses quadrant transects with three 100-meter transects, each placed in 11 quadrants. The results of the study successfully identified 7 types of seagrass, including Cymodocea rotundata, Enhalus acoroides, Halophila ovalis, Halodule pinifolia, Halodule uninervis, Syringodium isoetifolium, and Thalassia hemprichii. Based on calculations, the average percentage of seagrass cover is 57.68% and can be categorized as dense. However, although the cover is classified as dense, Meanwhile, according to the Ministry of Environment Decree No. 200/2004, the determination of the closure of seagrass meadow conditions can be categorized as less rich/less healthy. This indicates the potential for environmental problems that can affect the health of the seagrass ecosystem at Sunrise Beach. Keywords: seagrass condition, Sunrise Beach, coastal waters, seagrass cover Abstrak Lamun (seagrass) merupakan tumbuhan berbunga (magnoliopyta). Lamun memerlukan intensitas cahaya minimal $11% - 25%$ untuk fotosintesis, dan gangguan tersebut dapat mengurangi ketersediaan cahaya. Penelitian di Kawasan Wisata Sunrise, Desa Makalisung, bertujuan mengidentifikasi jenis dan kondisi padang lamun, mengingat adanya tekanan dari aktivitas manusia seperti pembuangan sampah dan lalu lintas perahu nelayan. Metode pengambilan data menggunakan transek kuadran dengan tiga transek sepanjang  100 meter, masing- masing diletakkan 11 kuadran. Hasil penelitian berhasil mengidentifikasi 7 jenis lamun, termasuk Cymodocea rotundata, Enhalus acoroides, Halophila ovalis, Halodule pinifolia, Halodule uninervis, Syringodium isoetifolium, dan Thalassia hemprichii.Berdasarkan perhitungan, rata-rata persentase tutupan lamun adalah 57,68% dan dapat dikategorikan padat.Namun, meskipun tutupan tergolong padat, Sedangkan menurut KEPMEN KLH No 200/2004, penentuan penutupan kondisi padang lamun dapat dikategorikan dalam kategori kurang kaya/kurang sehat. Hal ini menunjukkan adanya potensi masalah lingkungan yang dapat memengaruhi kesehatan ekosistem lamun di Pantai Sunrise. Kata kunci: kondisi lamun, Pantai Sunrise, perairan pesisir, tutupan lamun
Tracing The CRISPR System in The Genomes of The Oscillatoria acuminata and Stanieria cyanosphaera Originated from Malalayang Waters Laliboso, Jurwin A.; Rumengan, Inneke; Ginting, Elvy L.; Manembu, Indri S.; Mantiri, Desy M. H.; Kawung, Nickson J.
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.66220

Abstract

The CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) system is a specific nucleotide sequence in genomes of certain bacteria and archaea that functions as an adaptive immune system against viral infections and foreign genetic elements. However, not all microorganisms possess CRISPR systems; therefore, bioinformatic approaches are required to trace the occurrence of CRISPR-Cas systems. The objective of this study was to detect CRISPR-Cas systems in genomes of Oscillatoria acuminata and Stanieria cyanosphaera. Both species were identified among 2679 operational taxonomic units (OTUs) of microorganisms associated with ascidian Lissoclinum patella originated from Malalayang waters, based on previously reported metagenomic analyses. These species were selected due to their relatively high abundance and the availability of complete genome sequence data in the NCBI database, which were downloaded as FASTA format and analyzed using CRISPRCasFinder software. The results showed that O. acuminata possesses a complete genome sequence of 7,689,443 bp, containing 80 CRISPR arrays, of which two arrays are associated with Cas systems, and a total of 338 spacers. In the other hand, S. cyanosphaera has a complete genome sequence of 5,041,209 bp, with eight CRISPR arrays, two of which are associated with Cas systems, and a total of 37 spacers. The detected CRISPR loci were visualized using CRISPRCasViewer in three display models: linear, circular, and scatter plot. Further studies are required to determine the specific types of CRISPR-Cas systems present in each microbial genome. Keywords: O. acuminata; S. cyanosphaera; bioinformatics; CRISPRCasFinder; CRISPRCasViewer   Abstrak Sistem CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) merupakan susunan sekuens nukleotida spesifik dalam genom bakteri dan arkaea tertentu yang berfungsi sebagai  sistem imun adaptif mikroba terhadap serangan virus dan materi genetik asing. Namun, tidak semua mikroba memiliki sistem CRISPR, sehingga diperlukan pendekatan analisis bioinformatika untuk mendeteksi CRISPR. Tujuan penelitian ini adalah untuk menelusuri keberadaan sistem CRISPR-Cas pada genom Oscillatoria acuminata dan Stanieria cyanosphaera. Kedua 2 jenis mikroba ini ditemukan di antara 2679 operational taxonomic units (OTUs) mikroba yang berasosiasi dengan ascidia Lissoclinum patella dari perairan Malalayang, berdasarkan analisis metagenom yang telah dilaporkan sebelumnya.  Kedua spesies ini dipilih karena terdeteksi cukup melimpah, dan ketersediaan data urutan genom lengkap di NCBI. Data urutan genom diunduh dalam format FASTA dan dianalisis dengan perangkat lunak CRISPRCasFinder. Ternyata O. acuminata memiliki  sekuens genom  lengkap  7.689.443 bp dengan 80 unit  sistem CRISPR, dimana ada 2 unit dengan sistem Cas, serta 338 spacer. Sedangkan S. cyanosphaera memiliki sekuens genom lengkap sekitar 5.041.209 bp dengan 8 unit CRISPR, dan 2 unit dengan sistem Cas serta 37 spacer. Hasil deteksi CRISPR divisualisasikan menggunakan CRISPRCasViewer dalam tiga model tampilan, yaitu Linear, Circular, dan Scatter Plot. Selanjutnya, ke depan perlu penelusuran lebih lanjut untuk menentukan tipe CRISPR-Cas pada setiap genom mikroba tersebut. Kata Kunci: O. acuminata; S. cyanosphaera; bioinformatika; CRISPRCasFinder; CRISPRCasViewer  
Species and Density of Limpets (Patellogastropoda) in The Intertidal Rocky Shore Akaiwa Poluan, Irene; Rumengan, Inneke F.M.; Paruntu, Carolus P.; Bara, Robert A.; Sumilat, Deiske A.; Boneka, Farnis B.
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.66339

Abstract

Rocky intertidal shores are dynamic coastal ecosystems characterized by strong environmental gradients that generate distinct patterns of organism zonation. Limpets (Patellogastropoda) play a crucial role as primary herbivores and ecological indicators in these habitats. This study aimed to examine species composition and density of limpets in the upper and lower intertidal zones of the rocky intertidal shore of Akaiwa, Tomioka, Amakusa, Japan. The research was conducted from February to March 2025. Sampling was conducted using a quadrat sampling method with quadrats measuring 25 cm × 25 cm, randomly placed within a 10 m × 15 m study area across the upper and lower intertidal zones. Limpet specimens were identified based on shell morphological characteristics, and species density was calculated and statistically compared between zones using a t-student test. The results recorded eight limpet species belonging to the families Lottidae and Nacellidae, with seven species occurring in the upper zone and six species in the lower zone. Limpet density in the upper intertidal zone ranged from 1.60 to 20.80 ind/m² and was dominated by Lottia tenuisculpta, whereas the lower zone exhibited higher densities ranging from 1.60 to 28.80 ind/m², with a significant dominance of Cellana toreuma. The study concludes that limpet community structure is strongly influenced by vertical intertidal zonation. Further long-term studies are recommended to elucidate temporal dynamics of limpet communities in relation to seasonal variation and environmental change. Keywords: Amakusa, density, limpet, Akaiwa rocky shore, intertidal zonation   Abstrak Pantai intertidal berbatu merupakan ekosistem pesisir yang dinamis dengan gradien lingkungan yang kuat, sehingga membentuk pola zonasi organisme yang khas. Limpet (Patellogastropoda) berperan penting sebagai herbivora utama dan indikator ekologis pada ekosistem ini. Penelitian ini bertujuan untuk mengkaji komposisi jenis dan kepadatan limpet pada zona atas dan zona bawah pantai rocky intertidal Akaiwa, Tomioka, Amakusa, Jepang. Penelitian ini dilaksanakan pada Februari-Maret 2025. Pengambilan sampel dilakukan dengan metode quadrat sampling menggunakan kuadrat berukuran 25 cm × 25 cm yang ditempatkan secara acak di area 10 m × 15 m pada zonasi intertidal bagian atas dan bawah. Spesimen limpet diidentifikasi berdasarkan karakter morfologi cangkang, kemudian dianalisis kepadatan jenis dan diuji perbedaannya antar zona menggunakan uji t-student. Hasil penelitian menunjukkan bahwa delapan spesies limpet dari famili Lottidae dan Nacellidae teridentifikasi, dengan tujuh spesies pada zona atas dan enam spesies pada zona bawah. Kepadatan limpet di zona atas berkisar antara 1,60-20,80 ind/m² dan didominasi oleh Lottia tenuisculpta, sedangkan zona bawah memiliki kepadatan lebih tinggi, yaitu 1,60-28,80 ind/m², dengan dominasi Cellana toreuma yang berbeda nyata secara statistik. Kesimpulan penelitian menunjukkan bahwa struktur komunitas limpet dipengaruhi kuat oleh zonasi vertikal intertidal. Disarankan penelitian lanjutan dilakukan secara temporal untuk memahami dinamika komunitas limpet terhadap variasi musim dan perubahan lingkungan. Kata kunci: Amakusa, kepadatan, limpet, pantai berbatu Akaiwa, zonasi intertidal
Species and Density of Gastropods on The Intertidal Zone of The Rocky Shore at Akaiwa, Tomioka, Amakusa, Japan Karundeng, Joyfullness; Paruntu, Carolus P.; Rumengan, Inneke F. M.; Sinjal, Cathrien A. L.; Kemer, Kurniati; Kaligis, Erly Y.
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.66342

Abstract

Gastropods are a class belonging to the phylum Mollusca, characterised by a single shell and radula. In intertidal ecosystems, they serve as herbivores, detritivores, or predators, and are often used as indicators of environmental health. This study examines the density of gastropods in the rocky shore habitat of Akaiwa, Tomioka Peninsula, Japan. Samples were collected using random quadrats (25x25 cm) in the upper (R1) and lower (R2) intertidal zones. The results show variations in density between zones. In the upper zone (R1), density ranged from 17.60 ind/m² (Japeuthria cingulata) to 52.80 ind/m² (Thais clavigera). Meanwhile, in the lower zone (R2), density ranged from 4.80 ind/m² (Clypeomorus petrosa) to 52.80 ind/m² (Lunella correensis). The species Cellana nigrolineata also showed high density in both zones (R1: 41.60 ind/m²; R2: 54.40 ind/m²). Overall, the density pattern on the rocky shore of Akaiwa indicates variation influenced by vertical zonation, where distinct physical characteristics and environmental pressures in each zone shape the unique distribution of gastropod abundance. Keywords: Akaiwa, density, gastropoda, intertidal zone, rocky shore   Abstrak Gastropoda adalah kelas dalam filum Moluska  yang dicirikan oleh cangkang tunggal dan radula. Dalam ekosistem intertidal, mereka berperan sebagai herbivor, detritivor, atau predator, serta sering menjadi indikator kesehatan lingkungan.  Penelitian ini bertujuan untuk menghitung kepadatan gastropoda di habitat pantai Rocky Akaiwa, Semenanjung Tomioka, Jepang. Sampel diambil menggunakan kuadrat acak (25x25 cm) pada zona intertidal atas (R1) dan bawah (R2). Hasil menunjukkan variasi kepadatan antar zona. Di zona atas (R1), kepadatan berkisar antara 17,60 ind/m² (Japeuthria cingulata) hingga 52,80 ind/m² (Thais clavigera). Sementara di zona bawah (R2), kepadatan berkisar antara 4,80 ind/m² (Clypeomorus petrosa) hingga 52,80 ind/m² (Lunella correensis). Spesies Cellana nigrolineata juga menunjukkan kepadatan tinggi di kedua zona (R1: 41,60 ind/m²; R2: 54,40 ind/m²). Secara umum, pola kepadatan di pantai Rocky Akaiwa menunjukkan variasi yang dipengaruhi oleh zonasi vertikal, dengan karakteristik fisik dan tekanan lingkungan yang berbeda di setiap zona membentuk distribusi kelimpahan gastropoda yang khas. Kata kunci: Akaiwa, kepadatan, gastropoda, pantai rocky, zona intertidal
Determination of Dominant Mangrove Species and Comparison of Tree and Sapling Composition in The Mangrove Area of Sonsilo Village, West Likupang District, North Minahasa Regency Mandei, Kania F.A.; Rumengan, Antonius P.; Paruntu, Carolus P.; Manembu, Indri S.; Ginting, Elvy L.; Djamaluddin, Rignolda
JURNAL PESISIR DAN LAUT TROPIS Vol. 14 No. 1 (2026): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.14.1.2026.66590

Abstract

Mangrove forests are key ecosystems in tropical coastal areas that function as environmental stability guards through physical roles (preventing erosion and tsunamis), chemical (absorbing pollutants and storing carbon), and biological (marine biota habitat and source of biodiversity). This study aims to identify the species and determine the dominant species of mangroves and the comparison of tree and sapling composition in the mangrove area of ​​Sonsilo Village, West Likupang District, North Minahasa Regency.  The research was conducted over three months (September–November 2024) using a purposive sampling method to collect data on density, canopy cover, and species frequency. The results revealed seven mangrove species: A. marina, B. gymnorrhiza, C. tagal, R. apiculata, R. mucronata, S. alba, and X. granatum.  Among these, three species (B. gymnorrhiza, R. apiculata, and R. mucronata) were dominant at both tree and sapling levels, exhibiting the highest Importance Value Index (IVI).  Mangrove species diversity in the area is categorized as low to moderate, as indicated by the Shannon-Wiener Diversity Index (H'), reflecting that species richness is not yet fully optimal. Analysis of the Dominance Index (D) and Evenness Index (J') suggests a relatively even distribution of individuals among species.  The study recommends regular monitoring and evaluation, as well as conservation efforts, to maintain the stability of the mangrove ecosystem and support its sustainable use. These findings highlight the importance of biodiversity management in preserving the ecological balance of mangrove habitats. Keywords: Sonsilo Village, mangroves, mangroves composition

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