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Karakteristik Sarang Peneluran Penyu Lekang (Lepidochelys olivacea) di Pantai Jeen Yessa, Papua Barat - Indonesia Hasanah, Arifatul; Kolibongso, Duaitd; Lontoh, Deasy
Journal of Marine Research Vol 13, No 1 (2024): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v13i1.38103

Pantai Jeen Yessa merupakan salah satu tempat bertelur bagi beberapa spesies penyu di Pasifik Barat, dengan sekitar 75% peneluran terjadi di pantai utara semenanjung Bentang Laut Kepala Burung di wilayah Abun, Papua Barat. Wilayah ini memiliki karakteristik suhu yang tinggi dan kelembaban yang rendah. Kedua faktor tersebut memainkan peran penting dalam keberhasilan reproduksi. Penelitian ini merupakan salah satu studi pertama mengenai karakteristik morfologi sarang penyu lekang (L. olivacea) di Pantai Jeen Yessa, dan diharapkan dapat memberikan kontribusi terhadap pengetahuan regional mengenai spesies ini serta membantu dalam pengelolaan perlindungan setempat. Survei ini dilakukan di tiga lokasi selama musim bertelur pada Mei-Juli 2022. Karakteristik sarang L. olivacea: rata-rata bagian atas sarang 30 ± 5,41 (rata-rata ± SD) cm (kisaran 20 - 43 cm, n = 34); bagian bawah sarang 42 ± 5,14 (rata-rata ± SD) cm (kisaran 32 - 54 cm, n = 34); dan lebar sarang 27,3 ± 4,87 (rata-rata ± SD) cm (kisaran 18 - 38 cm, n = 34). Masa inkubasi antara kedua lokasi bervariasi: Warmamedi 62,5 hari ± 4,5 dan Batu Rumah 48,7 hari ± 1,8 (rata-rata ± SD). Rata-rata keberhasilan penetasan adalah 78,3%, dan tingkat kematian 21,7% (jumlah telur yang dihitung = 2.367). Penelitian lebih lanjut mengenai metode inkubasi buatan sangat disarankan, karena ini bisa menjadi pilihan penting untuk melestarikan populasi penyu. Jeen Yessa Beach is one of the nesting sites for several turtle species in Western Pasific, with approximately 75% of nesting occurring on the northern coast of the Bird’s Head Seascape peninsula in the Abun region of West Papua. This region is characterized by high temperatures and low humidity. Both factors play an important role in reproductive success. This is one of the first studies on the morphological characteristics of the nest of the olive ridley turtle (L. olivacea) on the Jeen Yessa beach, and it is expected to contribute to regional knowledge of this species and aid in local protection management. The survey was conducted in three locations during the nesting season in Mei-July 2022. L. olivacea nest characteristics: average nest top 30 ± 5.41 (mean ± SD) cm (range 20 – 43 cm, n = 34); nest bottom 42 ± 5.14 (mean ± SD) cm (range 32-54 cm, n = 34); and a nest width of 27.3 ± 4.9 (mean ± SD) cm (range 18 – 38 cm, n = 34). The incubation period between the two sites varies: Warmamedi 62.5 days ± 4.5 and Batu Rumah 48.7 days ± 1.8 (mean ± SD). The average hatching success was 78.3%, and the mortality rate was 21.7% (eggs counted = 2,367). More research into artificial incubation methods is recommended, as this could be an important option for preserving some sea turtle populations.

Exploration of Lipid Content in Sargassum binderi Algae from the North Coast of Manokwari West Papua Stepanus, Jamius Bin; Kolibongso, Duaitd
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 7, No 1 (2024): JANUARY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i1.56442

The aim of this research is to determine the potential of biodiesel from the algae Sargassum binderi from the North Coast of Manokwari by determining the lipid components contained in the algae. Lipid extraction was carried out using the soxhletation method with n-hexane solvent. Lipid percentage was determined via GCMS analysis. The research results obtained 4 lipid components consisting of hexadecanoic acid (palmitic acid), 9,12-hexadecadienoic acid, 9-octadecenoic acid (Z) (oleic acid) and octadecanoic acid (stearic acid) with a percentage of 18.12%, 4.75%, 19.4% and 4.29% respectively. The total percentage of lipid components extracted was 46.56%, almost half of the total extract.

Pengaruh Sedimentasi terhadap Tutupan Terumbu Karang di Perairan Arfai, Manokwari Indonesia Kolibongso, Duaitd; Alfani, Hermina Gloria; Loinenak, Frida A.; Sembel, Luky; Purba, Gandi Y S
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22130

Sedimentation adversely affects corals by impeding recruitment, hindering growth, and inducing stress, ultimately leading to degradation. This study aims to ascertain the correlation between sedimentation and coral cover. Five stations were sampled in Arfai waters in May 2023, with sedimentation rates measured using traps over 14 days. Coral reef conditions were assessed via the Point Intercept Transect (PIT) method, revealing a 'good' coral cover of 51%, dominated by Acropora submassive (ACS), Acropora branching (ACB), and Coral branching (CB). Sedimentation rates ranged from 6.26 to 33.92 mg/cm²/day, with impacts categorized from mild to moderate and moderate to heavy. Analysis confirms sedimentation's influence on coral reef life. Despite its significance for management strategies, long-term studies tracking coral reef structure and function in response to sediment influx are lacking. Further research on coral reef recovery post-sediment exposure is imperative. Sedimentasi memengaruhi karang dengan menghambat rekruitmen, menghambat pertumbuhan, dan menyebabkan stres, yang akhirnya menyebabkan degradasi. Studi ini bertujuan untuk mengetahui hubungan antara sedimentasi dan tutupan karang. Lima stasiun diambil sampelnya di perairan Arfai pada Mei 2023, dengan tingkat sedimentasi diukur menggunakan perangkap selama 14 hari. Kondisi terumbu karang dinilai melalui metode Point Intercept Transect (PIT), yang mengungkapkan tutupan karang 'baik' sebesar 51%, didominasi oleh Acropora submassive (ACS), Acropora branching (ACB), dan Coral branching (CB). Tingkat sedimentasi berkisar dari 6,26 hingga 33,92 mg/cm²/hari, dengan dampak yang dikategorikan dari ringan hingga sedang dan sedang hingga berat. Analisis menegaskan pengaruh sedimentasi terhadap kehidupan terumbu karang. Meskipun penting untuk strategi pengelolaan, studi jangka panjang yang melacak struktur dan fungsi terumbu karang dalam menanggapi masukan sedimen masih kurang. Penelitian lebih lanjut tentang pemulihan terumbu karang setelah paparan sedimen sangat penting.

Peningkatan kepedulian lingkungan pesisir melalui kegiatan transplantasi karang di masyarakat pesisir Arfai Manokwari: Improving coastal environmental concern through coral transplantation activities in the Arfai Coastal Comunnities Manokwari Loinenak, Frida; Kolibongso, Duaitd; Sembel, Luky; Manuhutu, Jafry; Suhaemi; Wattimury, Dougklas; Ayhuan, Hendrik
IGKOJEI: Jurnal Pengabdian Masyarakat Vol. 6 No. 1 (2025): IGKOJEI: Jurnal Pengabdian Masyarakat
Publisher : Fakultas Peternakan Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46549/igkojei.v6i1.520

ABSTRACT The presence of coral reefs in coastal regions serves crucial ecological and economic functions, providing significant benefits for biodiversity and local communities reliant on these ecosystems for their livelihoods. Despite their importance, coral reefs face numerous threats stemming from both anthropogenic and natural activities. One viable restoration strategy to protect coral reef ecosystems in coastal areas is coral transplantation. This community service initiative aims to enhance understanding and awareness of the critical role of coral reef ecosystems while promoting their sustainability among the coastal communities of Arfai. The outreach program included two primary topics: coral reefs and the technique of coral transplantation. The session, lasting approximately 1.5 hours, featured a question-and-answer format to facilitate discussion and idea exchange. A demonstration of coral transplantation was conducted for residents of RT 001, utilizing the spider web method. Participants actively engaged in the transplantation process by tying seedlings and placing transplant racks in the waters surrounding Raimuti Arfai Island. Keywords: Arfai Coastal Communities; Coral Transplantation; Environmental Concern ABSTRAK Keberadaan terumbu karang pada wilayah pesisir memiliki fungsi dan manfaat penting secara ekologi dan ekonomis bagi kehidupan biota dan bagi masyarakat pesisir dalam memenuhi kebutuhan hidup. Disamping potensi yang dimiliki, terumbu karang juga selalu mengalami ancaman dari berbagai aktivitas yang bersifat merusak baik akibat aktivitas antropogenik maupun alam. Salah satu upaya restorasi yang dapat dilakukan untuk menyelamatkan kehidupan terumbu karang di wilayah pesisir yaitu melalui tranplantasi karang. Tujuan kegiatan pengabdian ini adalah meningkatkan pemahaman dan kepedulian tentang pentingnya ekosistem terumbu karang dan turut menjaga kelestarian ekosistem terumbu karang kepada masyarakat pesisir Arfai. Dalam kegiatan penyuluhan terdapat 2 materi yang disampaikan yaitu tentang terumbu karang dan transplantasi karang. Kegiatan penyuluhan berlangsung selama kurang lebih 1,5 jam, dilakukan diskusi berupa tanya jawab atau saling bertukar pemikiran. Demonstrasi kegiatan transplantasi karang secara langsung kepada warga RT 001 tentang teknik transplantasi karang menggunakan metode jaring laba-laba (spider web). Warga turut dilibatkan dalam melakukan kegiatan transplantasi seperti pengikatan bibit, dan penempatan rak tranplantasi di perairan Pulau Raimuti Arfai. Kata Kunci: Kepedulian Lingkungan; Masyarakat Pesisir Arfai; Transplantasi Karang

Detection and Identification of Potentially Harmful Microalgal Species in Doreri Bay, Manokwari, West Papua, Indonesia: A Preliminary Study Tururaja, Tresia Sonia; Bawole, Roni; Mogea, Rina A.; Murtihapsari, Murtihapsari; Manan, Jemmy; Kusuma, Aradea Bujana; Kolibongso, Duaitd
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 30, No 1 (2025): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.30.1.33-70

Harmful algal blooms (HABs) frequently exhibit recurring patterns in specific locations and are often associated with significant environmental challenges, such as eutrophication. However, HABs have also been observed in areas with lower levels of eutrophication. This study aimed to detect and identify phytoplankton species responsible for blooms in the waters of Doreri Bay, with a particular focus on potentially harmful species (HABs). It represents the first attempt in this region to identify microalgal species. Field sampling was conducted during the southeast (dry) season of 2023 at nine stations across Doreri Bay. A total of 21 phytoplankton taxa, representing three classes were identified, with 14 taxa (66.7%) being potentially harmful. Phytoplankton cell densities ranged from 2.96 × 10⁴ cells L-1 to 1.22 × 10⁵ cells L-1, with an average density of 2.01 × 10⁴ cells L-1. The community was dominated by Diatoms, including Bacillaria spp., Coscinodiscus spp., and Rhizosolenia spp., and Cyanobacteria, mainly Trichodesmium spp. Two bloom patterns were observed: Cyanobacteria and Dinoflagellates dominated coastal areas, while Diatoms were more abundant in the outer bay. Correlation analysis revealed that temperature, salinity, and dissolved oxygen (DO) were the primary environmental factors driving phytoplankton variability and growth in the shallow coastal waters of Doreri Bay. These findings suggest that the phytoplankton community structure in this region remains stable when environmental gradients stay within the tolerance thresholds of sensitive species. Conversely, potentially harmful algal blooms are likely to develop when these environmental gradients exceed the tolerance levels of more resilient species.

Aspek Biologi Udang Jerbung (Penaeus merguiensis de Man 1888) di Perairan Kabupaten Teluk Bintun, Papua Barat Pranata, Bayu; Kusuma, Aradea Bujana; Sala, Ridwan; Sabariah, Vera; Lapadi, Ida; Saleh, Fitriyah Irnawati E.; Wyrasti, Andi Fajeriani; Kolibongso, Duaitd
Jurnal Sumberdaya Akuatik Indopasifik Vol 9 No 1 (2025): Februari
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46252/jsai-fpik-unipa.2025.Vol.9.No.1.520

The waters of Bintuni Bay have abundant natural resources, especially aquatic biota. One of the aquatic biota with high economic value is the Jerbung shrimp (Penaeus merguiensis). Currently, information about the biological aspects of shrimp in the waters of Bintuni Bay is still very lacking. Specifically, the aim of this research is to examine the size structure, first caught size (L50%), infinity size (L∞), growth patterns, condition factors and gonad maturity level (TKG) of Jerbung shrimp in the waters of Bintuni Bay. The research method used is the survey method. The research was carried out from March to April 2023. The results showed that the average carapace length and weight of male shrimp were 4.6 cm and 14.8 gr. Meanwhile, the average shell length and weight of female shrimp are 5.4 cm and 25.8 grams. The L50% value of male and female shrimp is 5.3 cm and 5.8 cm, the ½ L∞ value of male and female shrimp is 3.4 cm and 3.5 cm. If L50% > ½ L∞ means the size of the shrimp caught is quite large. The growth pattern of male and female shrimp is negative allometry (b = 0.1035 and b = 0.7424). The condition factor values for male and female shrimp are 0.31 and 1.73. The results of TKG observations showed that 75.2% of female shrimp were in TKG I and II, meaning that 50% of the shrimp caught had not yet reached TGK III and IV at the time of the research.

Diversity and density of marine intertidal gastropods in tropical seagrass beds at Oransbari Bay, South Manokwari - West Papua Kolibongso, Duaitd; Loinenak, Frida A.; Manuputty, Agnestesya
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 12, No 3 (2023): DECEMBER 2023
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.3.31138

Gastropod communities are one of the important components of the food chain in seagrass meadows. This study aims to investigate the diversity of gastropods in the distribution of the seagrass beds at Oransbari Bay. This study was carried out in November 2022, using the line transect method. Data collection is carried out at three stations, where each station is divided into three transects. A total of 36 species consisting of 16 families and 5 orders, were recorded in this study. The total density of gastropods found in the waters of Oransbari Bay ranged from 5.77-9.43 ind/m2, with an average of 6.99 2.10 ind/m2. Conus sp. has the highest density value of any gastropod. Meanwhile, for seagrasses, five species from four clans and two families were obtained. The percent cover of seagrass ranges from 17.05 3.30% 58.90 22.90% with an average of 40.18 21.3%.Halophila minor and Thallasia hempricii showed a positive correlation with gastropod density. The value of the gastropod diversity index is in the medium category, the gastropod evenness index is in the stable category, and the gastropod dominance index is in the low category. The results of this study provide a base for a proper gastropod checklist at Oransbari Bay. Future research is recommended that involves a more detailed studies on the feeding ecology and habitat preference of the gastropods.Keywords:DiversityDistributionGastropodsSeagrass bedsOransbari bay

Abundance and Composition of Targeted Reef Fish in an Unprotected Coral Reef Ecosystem: A Case Study of Oransbari Bay Kolibongso, Duaitd; Sitinjak, Toni; Bawole, Roni
Buletin Oseanografi Marina Vol 14, No 2 (2025): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v14i2.63931

Reef fisheries particularly those targeting specific fish species are integral to the coral reef ecosystem. Unprotected sites typically exhibit substantial declines in fish densities due to fishing pressure. We conducted an analysis to determine whether the abundance of target fish species correlates with benthic community structure and changes in composition resulting from fishing activities. The point intercept transect (PIT) method was employed to evaluate coral reef condition, while underwater visual census (UVC) was utilized to assess target fish species at three sites in Oransbari Bay. The mean live coral cover in Oransbari Bay was measured at 20.2% ± 2.37 (mean ± standard error). Benthic cover exhibited variation, with rubble comprising 27.6% ± 3.73%, sand 29.3% ± 2.58%, dead coral 9.44% ± 2.91%, and turf algae 4.33% ± 3.47%. The target species group displayed diversity, with 13 species identified across six families: Acanthuridae, Lutjanidae, Serranidae, Caesionidae, Balistidae, and Mullidae. Reef fish abundance ranged from 3,146.7 to 9,986.7 individuals per hectare, with the Acanthuridae family demonstrating the highest abundance and diversity, as it was present at all locations. This study elucidates that the abundance and diversity of target reef fish species in unprotected areas are significantly influenced by coral cover and fishing activities. These findings provide crucial insights into the status of fish resources beyond protected areas in the Bird’s Head Peninsula, contributing valuable information for future management of coral reef ecosystems.

Jenis-jenis Ikan Padang Lamun di Perairan Misool Selatan Raja Ampat Santus, Caprio Dos; Ayhuan, Hendrik V.; Sala, Ridwan; Kolibongso, Duaitd; Suhaemi, Suhaemi; Loinenak, Frida A.
ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua Vol 8 No 1 (2025): ACROPORA: Jurnal Ilmu Kelautan dan Perikanan Papua Edisi Mei 2025
Publisher : Cenderawasih University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31957/acr.v8i1.4688

Padang lamun merupakan habitat beberapa komunitas ikan pada masa juvenil dan atau dewasa, secara tetap, musiman dan tidak tetap. Potensi dan kondisi komunitas ikan lamun dapat mengalami gangguan dan ancaman seperti predator asing, kerusakan habitat, dan perubahan kualitas perairan maupun akibat aktivitas manusia. Penelitian ini bertujuan untuk mendeskripsikan jenis-jenis ikan padang lamun dengan kaitan aspek ekologinya di perairan Misool Selatan Raja Ampat khususnya perairan Pulau Calpop, Pulau Kabalanbatan, dan Pulau Yefba. Metode pengambilan sampel ikan menggunakan jaring puri yang diseret pada lintasan pengambilan sampel sejauh 90 m dan dibagi menjadi tiga kali pengambilan, serta arah tarikan sejajar garis pantai dan berlawanan dengan arah arus. Pengukuran kualitas perairan dilakukan pada setiap titik lokasi pengambilan sampel ikan, meliputi suhu, salinitas, pH dan DO. Data dianalisis untuk menentukan komposisi dan kelimpahan jenis, keanekaragaman, keseragaman dan dominansi jenis. Untuk melihat hubungan antara paramater kualitas perairan dengan kelimpahan ikan digunakan uji korelasi Pearson. Hasil menunjukan sebanyak 2.759 ekor ikan yang tertangkap yang terdiri dari 18 genus dan 21 jenis, dengan kelimpahan tertinggi adalah jenis P. lineatus sebesar 40.802 ind/ha. Perairan Pulau Calpop, Pulau Kabalanbatan dan Pulau Yefba memiliki indeks keanekaragaman jenis berada pada kategori rendah. Perairan Pulau Calpop dan Pulau Kabalanbatan masuk dalam kategori kondisi tertekan, sedangkan perairan Pulau Yefba berada dalam kondisi labil. Terdapat spesies yang mendominansi di perairan Pulau Calpop dan Pulau Kabalanbatan, sedangkan Pulau Yefba tidak terdapat spesies yang mendominansi. Hasil korelasi pearson salinitas memberikan pengaruh yang sangat kuat terhadap kelimpahan ikan, sedangkan suhu, pH dan DO tidak memberikan pengaruh yang kuat terhadap kelimpahan ikan.

Diversity and density of marine intertidal gastropods in tropical seagrass beds at Oransbari Bay, South Manokwari - West Papua Kolibongso, Duaitd; Loinenak, Frida A.; Manuputty, Agnestesya
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 12, No 3 (2023): DECEMBER 2023
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.12.3.31138

Gastropod communities are one of the important components of the food chain in seagrass meadows. This study aims to investigate the diversity of gastropods in the distribution of the seagrass beds at Oransbari Bay. This study was carried out in November 2022, using the line transect method. Data collection is carried out at three stations, where each station is divided into three transects. A total of 36 species consisting of 16 families and 5 orders, were recorded in this study. The total density of gastropods found in the waters of Oransbari Bay ranged from 5.77-9.43 ind/m2, with an average of 6.99 2.10 ind/m2. Conus sp. has the highest density value of any gastropod. Meanwhile, for seagrasses, five species from four clans and two families were obtained. The percent cover of seagrass ranges from 17.05 3.30% 58.90 22.90% with an average of 40.18 21.3%.Halophila minor and Thallasia hempricii showed a positive correlation with gastropod density. The value of the gastropod diversity index is in the medium category, the gastropod evenness index is in the stable category, and the gastropod dominance index is in the low category. The results of this study provide a base for a proper gastropod checklist at Oransbari Bay. Future research is recommended that involves a more detailed studies on the feeding ecology and habitat preference of the gastropods.Keywords:DiversityDistributionGastropodsSeagrass bedsOransbari bay

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