Pub Date : 2024-01-03DOI: 10.14710/jkt.v27i1.20637
Agus Kusnadi, L. Alifatri, Ardian Nurrasyid Chamidy, A. Rasyidin, Sobirin Sobirin
In the coastal ecosystem, seagrass meadows play a vital role in delivering ecosystem services such as provision, control, and support. However, this ecosystem is one of the most threatened in the coastal environment, and it has been degraded as a result of anthropogenic disturbance and rapid environmental changes. Furthermore, the extent of the seagrass meadows is unknown, and the health of the meadows is unmonitored and unrecorded. There is little information on the current state of the seagrass extent and health conditions in Karimunjawa National Park. We evaluate the abundance, states, and health conditions of the seagrass meadows based on the ecological quality index in Karimunjawa National Park, Jepara, Indonesia. This district has a vast extent of seagrass meadows but has been affected by the expansion of the industrial/tourism area within the region. This study aimed to assess the seagrass current condition based on the ecological quality index. The result showed that the total seagrass extent area in Karimunjawa National Park was 969,15 ha where seven species were found in this area, including Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Cymodocea serrulate, Halodule pinifolia, Halophila ovalis and Halodule uninervis. Seagrass meadow coverages were moderate and categorized as less healthy. The seagrass ecological quality index value was 0.66 which indicated that the seagrass condition in Karimunjawa National Park was moderate. Ecological factors that affect the seagrass state are epiphyte cover and macroalgal cover.
{"title":"Evaluating the seagrass ecological condition and habitat extent in Karimunjawa National Park, Jepara Indonesia","authors":"Agus Kusnadi, L. Alifatri, Ardian Nurrasyid Chamidy, A. Rasyidin, Sobirin Sobirin","doi":"10.14710/jkt.v27i1.20637","DOIUrl":"https://doi.org/10.14710/jkt.v27i1.20637","url":null,"abstract":"In the coastal ecosystem, seagrass meadows play a vital role in delivering ecosystem services such as provision, control, and support. However, this ecosystem is one of the most threatened in the coastal environment, and it has been degraded as a result of anthropogenic disturbance and rapid environmental changes. Furthermore, the extent of the seagrass meadows is unknown, and the health of the meadows is unmonitored and unrecorded. There is little information on the current state of the seagrass extent and health conditions in Karimunjawa National Park. We evaluate the abundance, states, and health conditions of the seagrass meadows based on the ecological quality index in Karimunjawa National Park, Jepara, Indonesia. This district has a vast extent of seagrass meadows but has been affected by the expansion of the industrial/tourism area within the region. This study aimed to assess the seagrass current condition based on the ecological quality index. The result showed that the total seagrass extent area in Karimunjawa National Park was 969,15 ha where seven species were found in this area, including Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Cymodocea serrulate, Halodule pinifolia, Halophila ovalis and Halodule uninervis. Seagrass meadow coverages were moderate and categorized as less healthy. The seagrass ecological quality index value was 0.66 which indicated that the seagrass condition in Karimunjawa National Park was moderate. Ecological factors that affect the seagrass state are epiphyte cover and macroalgal cover. ","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"213 1-2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-03DOI: 10.14710/jkt.v27i1.20655
Lucky Rahman, N. Zamani, M. Ismet, Muhammad Reza Cordova
Monitoring and assessing the items stranded on shorelines is a crucial step in addressing the threat posed by marine debris to our ocean. The objective of this study is to examine the occurrence and categorize marine debris that accumulates on the beach and mangrove area of Pulau Rambut Wildlife Reserve from the transitional season 2 to the rainy season. The abundance of marine debris is significant in transitional season 2. There is no significant difference between different seasons. The dominant form of debris among all macrodebris categories during transitional season 2 was plastic, accounting for 46.38% of the total. Single-use plastics like styrofoam, shoes, sandals, gloves, plastic wrap, and plastic sachets were found to be the most common types of large-scale plastic debris, comprising 60% of total macroplastic debris. The debris found on Rambut Island is believed to originate from debris carried by rivers that flow into Jakarta Bay. The presence of seasonal winds, currents, waves, and tides further contribute to the accumulation of debris in this area.
{"title":"Effects of seasonal variation on the characteristics of stranded marine debris within Rambut Island Wildlife Reserve, Indonesia","authors":"Lucky Rahman, N. Zamani, M. Ismet, Muhammad Reza Cordova","doi":"10.14710/jkt.v27i1.20655","DOIUrl":"https://doi.org/10.14710/jkt.v27i1.20655","url":null,"abstract":"Monitoring and assessing the items stranded on shorelines is a crucial step in addressing the threat posed by marine debris to our ocean. The objective of this study is to examine the occurrence and categorize marine debris that accumulates on the beach and mangrove area of Pulau Rambut Wildlife Reserve from the transitional season 2 to the rainy season. The abundance of marine debris is significant in transitional season 2. There is no significant difference between different seasons. The dominant form of debris among all macrodebris categories during transitional season 2 was plastic, accounting for 46.38% of the total. Single-use plastics like styrofoam, shoes, sandals, gloves, plastic wrap, and plastic sachets were found to be the most common types of large-scale plastic debris, comprising 60% of total macroplastic debris. The debris found on Rambut Island is believed to originate from debris carried by rivers that flow into Jakarta Bay. The presence of seasonal winds, currents, waves, and tides further contribute to the accumulation of debris in this area.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"287 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-03DOI: 10.14710/jkt.v27i1.20953
Rapita Haptari, Siti Aisyah, Wahyu Adi, Arthur M Farhaby, Henri Henri, Jemi Ferizal, Okto Supratman
South Bangka Regency is one of the districts that has the potential for fish biodiversity in seagrass meadows when viewed from its area and diversity. Seagrass beds are areas that have the potential to be conservation sites from an ecological point of view and represent the sustainability of fish resources. This study aims to determine the richness of fish species, fish composition, abundance, diversity, uniformity and dominating fish as well as the relationship of seagrass cover to the abundance and biomass of fish found in southern Bangka Waters. The study will be conducted in southern Bangka Regency in June 2023 covering 4 stations. Seagrass data collection in the form of seagrass cover using the quadratic transect method and swept area method (sweep) in fish data collection. The results of the study from the four stations there were 243 individuals including 23 species of fish from 18 families namely Alosidae, Apogonidae, Chaetodontidae, Engraulidae, Gerreidae, Labridae, Lethrinidae, Pinguipedidae, Platycephalidae, Scorpaenidae, Siganidae, Sphyraenidae, Syngnathidae, Terapontidae, Ambassidae, Gobiidae, Monacanthidae and Leiognathidae. The highest fish species composition was found at station 4, namely Gerres limbatus by 32.51% with 79 individuals. The abundance value found was 822 ind/ha and fish diversity was categorized as medium, fish uniformity tended to be high and dominance index was low. The abundance and biomass of fish are influenced by the percentage of seagrass cover, where the higher the percentage value of seagrass cover, the higher the abundance value and biomass of fish in the area. Kabupaten Bangka Selatan merupakan salah satu kabupaten yang memiliki potensi biodiversitas ikan di padang lamun jika dilihat dari luasan dan keanekaragamannya. Padang lamun adalah kawasan yang berpotensi sebagai tempat konservasi dilihat dari sudut pandang ekologis dan mewakili keberlanjutan sumber daya ikan. Penelitian ini bertujuan untuk mengetahui kekayaan jenis ikan, komposisi ikan, kelimpahan, keanekaragaman, keseragaman dan ikan yang mendominasi serta hubungan tutupan lamun terhadap kelimpahan dan biomassa ikan yang ditemukan di Perairan Bangka bagian selatan. Penelitian dilakukan di Kabupaten Bangka bagian selatan pada bulan Juni 2023 meliputi 4 stasiun. Pengambilan data lamun berupa tutupan lamun menggunakan metode transek kuadrat dan metode swept area (sapuan) pada pengambilan data ikan. Hasil penelitian dari keempat stasiun terdapat 243 individu mencakup 23 spesies ikan dari 18 famili yaitu Alosidae, Apogonidae, Chaetodontidae, Engraulidae, Gerreidae, Labridae, Lethrinidae, Pinguipedidae, Platycephalidae, Scorpaenidae, Siganidae, Sphyraenidae, Syngnathidae, Terapontidae, Ambassidae, Gobiidae, Monacanthidae dan Leiognathidae. Komposisi jenis ikan tertinggi terdapat pada stasiun 4 yaitu Gerres limbatus sebesar 32,51% dengan jumlah individu 79. Nilai kelimpahan yang ditemukan adalah 822 ind/ha dan keanekaragaman ikan dikategorikan sedang
{"title":"Hubungan Ikan dengan Padang Lamun di Perairan Bangka Selatan, Kepulauan Bangka Belitung","authors":"Rapita Haptari, Siti Aisyah, Wahyu Adi, Arthur M Farhaby, Henri Henri, Jemi Ferizal, Okto Supratman","doi":"10.14710/jkt.v27i1.20953","DOIUrl":"https://doi.org/10.14710/jkt.v27i1.20953","url":null,"abstract":"South Bangka Regency is one of the districts that has the potential for fish biodiversity in seagrass meadows when viewed from its area and diversity. Seagrass beds are areas that have the potential to be conservation sites from an ecological point of view and represent the sustainability of fish resources. This study aims to determine the richness of fish species, fish composition, abundance, diversity, uniformity and dominating fish as well as the relationship of seagrass cover to the abundance and biomass of fish found in southern Bangka Waters. The study will be conducted in southern Bangka Regency in June 2023 covering 4 stations. Seagrass data collection in the form of seagrass cover using the quadratic transect method and swept area method (sweep) in fish data collection. The results of the study from the four stations there were 243 individuals including 23 species of fish from 18 families namely Alosidae, Apogonidae, Chaetodontidae, Engraulidae, Gerreidae, Labridae, Lethrinidae, Pinguipedidae, Platycephalidae, Scorpaenidae, Siganidae, Sphyraenidae, Syngnathidae, Terapontidae, Ambassidae, Gobiidae, Monacanthidae and Leiognathidae. The highest fish species composition was found at station 4, namely Gerres limbatus by 32.51% with 79 individuals. The abundance value found was 822 ind/ha and fish diversity was categorized as medium, fish uniformity tended to be high and dominance index was low. The abundance and biomass of fish are influenced by the percentage of seagrass cover, where the higher the percentage value of seagrass cover, the higher the abundance value and biomass of fish in the area. Kabupaten Bangka Selatan merupakan salah satu kabupaten yang memiliki potensi biodiversitas ikan di padang lamun jika dilihat dari luasan dan keanekaragamannya. Padang lamun adalah kawasan yang berpotensi sebagai tempat konservasi dilihat dari sudut pandang ekologis dan mewakili keberlanjutan sumber daya ikan. Penelitian ini bertujuan untuk mengetahui kekayaan jenis ikan, komposisi ikan, kelimpahan, keanekaragaman, keseragaman dan ikan yang mendominasi serta hubungan tutupan lamun terhadap kelimpahan dan biomassa ikan yang ditemukan di Perairan Bangka bagian selatan. Penelitian dilakukan di Kabupaten Bangka bagian selatan pada bulan Juni 2023 meliputi 4 stasiun. Pengambilan data lamun berupa tutupan lamun menggunakan metode transek kuadrat dan metode swept area (sapuan) pada pengambilan data ikan. Hasil penelitian dari keempat stasiun terdapat 243 individu mencakup 23 spesies ikan dari 18 famili yaitu Alosidae, Apogonidae, Chaetodontidae, Engraulidae, Gerreidae, Labridae, Lethrinidae, Pinguipedidae, Platycephalidae, Scorpaenidae, Siganidae, Sphyraenidae, Syngnathidae, Terapontidae, Ambassidae, Gobiidae, Monacanthidae dan Leiognathidae. Komposisi jenis ikan tertinggi terdapat pada stasiun 4 yaitu Gerres limbatus sebesar 32,51% dengan jumlah individu 79. Nilai kelimpahan yang ditemukan adalah 822 ind/ha dan keanekaragaman ikan dikategorikan sedang","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"50 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-10DOI: 10.14710/jkt.v26i3.20658
S. Subagiyo, S. Margino, T. Triyanto, S. Widada
Growth is one of the targets of shrimp cultivation. One factor that influences this growth is the level of immunity. Paraprobiotics are probiotics that have been inactivated, making it easier for production, storage and application. In this research, a test was carried out on the application of inactive Lactobacilus lactis to vanamei shrimp via pelleted feed (ad libitum). The experiment was carried out on a laboratory scale. There were 4 treatments, namely a single application of one of the 3 L. lactis isolates (isolate U.181, P.32 dan W-331)and a mixed of 3 L. lactis isolates. The application dose was 108 cells/gram of feed. The experiment was carried out for 35 days. Parameters observed included weight gain and cellular immune system (total number of hemocytes and hemocyte activity).The results of this study indicate that the application of the paraprobiotic L. lactis either alone or in the form of a mixture of the three can improve the growth performance and immunity of vanamei shrimp, namely being able to increase growth between 32-38% higher than the control, as well as increasing the total number of hemocytes and phagocytic activity respectively between 27.4-35.6 % and 29.1-45.9 % higher than the control. Pertumbuhan merupakan salah satu target budidaya udang. Salah satu factor yang mempengaruhi pertumbuhan adalah tingkat imunitas. Paraprobiotik adalak probiotik yang telah diinaktifkan/dimatikan, sehingga memudahkan untuk produksi, penyimpanan hingga aplikasi. Pada penelitian ini telah dilakukan uji aplikasi Lactobacilus lactis inaktif sebagai paraprobiotik ke udang vanamei melalui pakan pellet (ad libitum). Percobaa dilakukan pada skala laboratorium Ada 4 perlakuan, yaitu aplikasi tunggal salah satu dari 3 isolat L. lactis (isolat U.181, P.32 dan W-331) dan aplikasi campuran 3 isolat L. lactis. Dosis aplikasi yang dipilih adalah 108 sel/gram pakan. Percobaan dilakukan selama 35 hari. Parameter yang diamati meliputi pertambahan berat dan sistem imun seluler (total jumlah hemosit dan aktivitas hemosit). Hasil penelitian aplikasi paraprobiotik L. lactis baik secara tunggal atau dalam bentuk campuran ketiganya dapat meningkatkan performa pertumbuhan dan imunitas udang vanamei. Pada kondisi penelitian ini, apiikasi paraprobiotik mampu meningkatkan pertumbuhan antara 32-38 % lebih tinggi daripada kontrol, serta meningkatkan jumlah total hemosit dan aktivitas fagositosis berturut-turut sebesar antara 27,4-35,6 % dan 29,1-45,9 % lebih tinggi daripada kontrol.
{"title":"Uji Aplikasi Lactobacillus lactis sebagai Paraprobiotik pada Budidaya Udang Vanamei (Litopenaeus vannamei) : Aspek Pertumbuhan Dan Imunitas","authors":"S. Subagiyo, S. Margino, T. Triyanto, S. Widada","doi":"10.14710/jkt.v26i3.20658","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.20658","url":null,"abstract":"Growth is one of the targets of shrimp cultivation. One factor that influences this growth is the level of immunity. Paraprobiotics are probiotics that have been inactivated, making it easier for production, storage and application. In this research, a test was carried out on the application of inactive Lactobacilus lactis to vanamei shrimp via pelleted feed (ad libitum). The experiment was carried out on a laboratory scale. There were 4 treatments, namely a single application of one of the 3 L. lactis isolates (isolate U.181, P.32 dan W-331)and a mixed of 3 L. lactis isolates. The application dose was 108 cells/gram of feed. The experiment was carried out for 35 days. Parameters observed included weight gain and cellular immune system (total number of hemocytes and hemocyte activity).The results of this study indicate that the application of the paraprobiotic L. lactis either alone or in the form of a mixture of the three can improve the growth performance and immunity of vanamei shrimp, namely being able to increase growth between 32-38% higher than the control, as well as increasing the total number of hemocytes and phagocytic activity respectively between 27.4-35.6 % and 29.1-45.9 % higher than the control. Pertumbuhan merupakan salah satu target budidaya udang. Salah satu factor yang mempengaruhi pertumbuhan adalah tingkat imunitas. Paraprobiotik adalak probiotik yang telah diinaktifkan/dimatikan, sehingga memudahkan untuk produksi, penyimpanan hingga aplikasi. Pada penelitian ini telah dilakukan uji aplikasi Lactobacilus lactis inaktif sebagai paraprobiotik ke udang vanamei melalui pakan pellet (ad libitum). Percobaa dilakukan pada skala laboratorium Ada 4 perlakuan, yaitu aplikasi tunggal salah satu dari 3 isolat L. lactis (isolat U.181, P.32 dan W-331) dan aplikasi campuran 3 isolat L. lactis. Dosis aplikasi yang dipilih adalah 108 sel/gram pakan. Percobaan dilakukan selama 35 hari. Parameter yang diamati meliputi pertambahan berat dan sistem imun seluler (total jumlah hemosit dan aktivitas hemosit). Hasil penelitian aplikasi paraprobiotik L. lactis baik secara tunggal atau dalam bentuk campuran ketiganya dapat meningkatkan performa pertumbuhan dan imunitas udang vanamei. Pada kondisi penelitian ini, apiikasi paraprobiotik mampu meningkatkan pertumbuhan antara 32-38 % lebih tinggi daripada kontrol, serta meningkatkan jumlah total hemosit dan aktivitas fagositosis berturut-turut sebesar antara 27,4-35,6 % dan 29,1-45,9 % lebih tinggi daripada kontrol.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139281123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-10DOI: 10.14710/jkt.v26i3.20141
Hadi Endrawati, S. Redjeki, R. Nuraini, M. A. Tharieq
Crab fishing activities using various fishing gears have the potential to catch other types of biota as known as bycatch. This type of bycatch is generally still used either for sale or for personal consumption, but some are re-released again. This research aims to determine the composition of the main catch and bycatch obtained by crab fishermen from Danasari Village, Pemalang. The research was carried out from July to August 2022. The data collection method was purposive sampling by going out to sea with fishermen to crab fishing grounds. The composition of the main catch and bycatch obtained at crab fishing locations consists of 1 type of main catch and 21 types of bycatch. The composition of the blue swimming crab is dominated by male crabs with a ratio of 1:0.7, with a mode of carapace width that is larger than female crabs, namely 107-115 mm. The proportion of bycatch obtained was only 25.73% from the total catch, with the useable bycatch amount more than the discarded bycatch. The ecological index shows that the value of species diversity and evenness is in the medium category with a value of 2.114 and 0.6944, while the dominance value is in the low category with a value of 0.1703. Useable bycatches that are commonly found are Orastoquilla oratoria, Scylla sp., and Babylonia spirata. The percentage of main catch is higher than bycatch, which indicates that fishing activities are still environmentally friendly, but the use of bycatch needs to be increased. It is hoped that data on the composition of bycatch types from Danasari Village fishermen can provide information on the potential of marine products other than crab, or could be said to be another alternative as a catch target to reduce exploitation of blue swimming crab resources. Aktivitas penangkapan perikanan rajungan dengan berbagai alat tangkap memiliki potensi terdapat jenis tangkapan biota lain atau disebut sebagai tangkapan samping. Jenis tangkapan samping (bycatch) umumnya tetap dimanfaatkan baik untuk dijual maupun sebagai konsumsi pribadi, namun ada juga yang dilepas kembali. Penelitian ini bertujuan untuk mengetahui komposisi tangkapan utama dan tangkapan samping yang didapatkan oleh nelayan rajungan dari Desa Danasari, Pemalang. Penelitian dilaksanakan selama bulan Juli sampai dengan Agustus 2022. Metode pengambilan data secara purposive sampling, yaitu ikut pergi melaut dengan nelayan ke lokasi penangkapan rajungan. Komposisi jenis tangkapan utama dan tangkapan samping yang didapatkan di lokasi penangkapan rajungan terdiri atas 1 jenis tangkapan utama dan 21 jenis tangkapan samping. Komposisi tangkapan utama rajungan didominasi oleh rajungan jantan dengan rasio 1:0,7, dengan modus ukuran lebar karapas yang lebih besar dibanding rajungan betina yaitu 107-115 mm. Proporsi tangkapan samping yang didapatkan hanya sebesar 25,73% dari total tangkapan keseluruhan, dengan jumlah tangkapan samping bernilai ekonomi lebih banyak dibandingan yang terbuang. Indeks ekologi menunjukkan n
{"title":"Komposisi Hasil Tangkapan Utama Rajungan dan Tangkapan Samping Nelayan Desa Danasari, Pemalang","authors":"Hadi Endrawati, S. Redjeki, R. Nuraini, M. A. Tharieq","doi":"10.14710/jkt.v26i3.20141","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.20141","url":null,"abstract":"Crab fishing activities using various fishing gears have the potential to catch other types of biota as known as bycatch. This type of bycatch is generally still used either for sale or for personal consumption, but some are re-released again. This research aims to determine the composition of the main catch and bycatch obtained by crab fishermen from Danasari Village, Pemalang. The research was carried out from July to August 2022. The data collection method was purposive sampling by going out to sea with fishermen to crab fishing grounds. The composition of the main catch and bycatch obtained at crab fishing locations consists of 1 type of main catch and 21 types of bycatch. The composition of the blue swimming crab is dominated by male crabs with a ratio of 1:0.7, with a mode of carapace width that is larger than female crabs, namely 107-115 mm. The proportion of bycatch obtained was only 25.73% from the total catch, with the useable bycatch amount more than the discarded bycatch. The ecological index shows that the value of species diversity and evenness is in the medium category with a value of 2.114 and 0.6944, while the dominance value is in the low category with a value of 0.1703. Useable bycatches that are commonly found are Orastoquilla oratoria, Scylla sp., and Babylonia spirata. The percentage of main catch is higher than bycatch, which indicates that fishing activities are still environmentally friendly, but the use of bycatch needs to be increased. It is hoped that data on the composition of bycatch types from Danasari Village fishermen can provide information on the potential of marine products other than crab, or could be said to be another alternative as a catch target to reduce exploitation of blue swimming crab resources. Aktivitas penangkapan perikanan rajungan dengan berbagai alat tangkap memiliki potensi terdapat jenis tangkapan biota lain atau disebut sebagai tangkapan samping. Jenis tangkapan samping (bycatch) umumnya tetap dimanfaatkan baik untuk dijual maupun sebagai konsumsi pribadi, namun ada juga yang dilepas kembali. Penelitian ini bertujuan untuk mengetahui komposisi tangkapan utama dan tangkapan samping yang didapatkan oleh nelayan rajungan dari Desa Danasari, Pemalang. Penelitian dilaksanakan selama bulan Juli sampai dengan Agustus 2022. Metode pengambilan data secara purposive sampling, yaitu ikut pergi melaut dengan nelayan ke lokasi penangkapan rajungan. Komposisi jenis tangkapan utama dan tangkapan samping yang didapatkan di lokasi penangkapan rajungan terdiri atas 1 jenis tangkapan utama dan 21 jenis tangkapan samping. Komposisi tangkapan utama rajungan didominasi oleh rajungan jantan dengan rasio 1:0,7, dengan modus ukuran lebar karapas yang lebih besar dibanding rajungan betina yaitu 107-115 mm. Proporsi tangkapan samping yang didapatkan hanya sebesar 25,73% dari total tangkapan keseluruhan, dengan jumlah tangkapan samping bernilai ekonomi lebih banyak dibandingan yang terbuang. Indeks ekologi menunjukkan n","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139280636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.14710/jkt.v26i3.20156
Nila Munana, R. Pribadi, C. A. Suryono
The ongoing global warming is causing climate change in several regions of Indonesia, resulting in various impacts. One of these impacts affects coastal areas, namely, the rise in sea levels. The mangrove ecosystem is one of the coastal ecosystems with a crucial role in both ecological and economic aspects of life. This ecosystem is more susceptible to damage due to climate change and human activities. The purpose of this research is to determine the vulnerability level of the mangrove ecosystem, thereby serving as a reference for the rehabilitation of the mangrove ecosystem in Timbulsloko Village. The method used is descriptive exploratory, involving direct field measurements of oceanographic variables, such as salinity, substrate, and tidal data. The analysis employed was the Coastal Vulnerability Index (CVI) with scores divided into three categories: low, moderate, and high, with respective scores ranging between 0.45-2.31, 2.32-4.62, and 4.63-6.93. An analysis of the mangrove substrate was also conducted to determine the existing substrate types in Timbulsloko Village. The obtained results indicate that the salinity around the mangrove ranges from 29-30 ppt, the substrate type is characterized as mud, and the average tidal height is 1.5 m with a mixed leaning towards diurnal single tide. As a result, the vulnerability index value of the mangrove ecosystem in Timbulsloko Village is considered moderate, with a score of 3. The level of mangrove vulnerability is moderate, but sustainable management of the mangrove ecosystem is still required for the future.
{"title":"Vulnerability Assessment of Mangroves using the Coastal Vulnerability Index in Timbulsloko Village, Sayung, Demak","authors":"Nila Munana, R. Pribadi, C. A. Suryono","doi":"10.14710/jkt.v26i3.20156","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.20156","url":null,"abstract":"The ongoing global warming is causing climate change in several regions of Indonesia, resulting in various impacts. One of these impacts affects coastal areas, namely, the rise in sea levels. The mangrove ecosystem is one of the coastal ecosystems with a crucial role in both ecological and economic aspects of life. This ecosystem is more susceptible to damage due to climate change and human activities. The purpose of this research is to determine the vulnerability level of the mangrove ecosystem, thereby serving as a reference for the rehabilitation of the mangrove ecosystem in Timbulsloko Village. The method used is descriptive exploratory, involving direct field measurements of oceanographic variables, such as salinity, substrate, and tidal data. The analysis employed was the Coastal Vulnerability Index (CVI) with scores divided into three categories: low, moderate, and high, with respective scores ranging between 0.45-2.31, 2.32-4.62, and 4.63-6.93. An analysis of the mangrove substrate was also conducted to determine the existing substrate types in Timbulsloko Village. The obtained results indicate that the salinity around the mangrove ranges from 29-30 ppt, the substrate type is characterized as mud, and the average tidal height is 1.5 m with a mixed leaning towards diurnal single tide. As a result, the vulnerability index value of the mangrove ecosystem in Timbulsloko Village is considered moderate, with a score of 3. The level of mangrove vulnerability is moderate, but sustainable management of the mangrove ecosystem is still required for the future.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139304641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-29DOI: 10.14710/jkt.v26i3.18165
C. A. Suryono, Agus Indardjo
Coastal areas of Semarang and Tegal, there are several industries that use metal materials. These activities will have an impact on the marine ecosystem, especially the biota that lives in it. The research aims to determine the metal contamination of Chromium (Cr) and Iron (Fe) in benthic biota in the waters of Semarang and Tegal, Central Java. Analysis of Cr and Fe concentrations in biota tissues using ICPMS. The results of analysis of Cr and Fe metals in the biota tissues of white shrimp (P. Merguensis), crab (P. pelagicus), coocle (A. inaequivalvis) and gastropods (H. ternatanus) found Cr and Fe metals in the biota tissues. The concentration of Cr metal in biota found in Semarang ranges from 0.211– 0.235 ppm, while in Tegal it ranges from 0.1–0.218 ppm. Fe metal concentrations from Semarang biota ranged from 0.718 – 0.909 ppm, while those from Tegal were 0.733 – 1.429 ppm. The concentrations of Cr and Fe metals in each biota and research location showed no differences, while Fe metals showed differences. Pesisir kota Semarang dan Tegal terdapat beberapa industri yang menggunakan bahan logam. Aktifitas tersebut akan berdampak pada ekosistem laut terutama biota yang hidup didalamya. Penelitian bertujuan mengethui kontaminansi logam Kromium (Cr) dan Besi (Fe) pada biota benthik di perairan Semarang dan Tegal Jawa Tengah. Analisa konsentrasi Cr dan Fe dalam jaringan biota menguunakan ICPMS. Hasil analisa logam Cr dan Fe dalam jaringan biota udang putih (P. Merguensis), rajungan (P. pelagicus), kerang bulu (A. inaequivalvis) dan gastropoda (H. ternatanus) ditemukan logam Cr dan Fe dalam jaringan biota. Konsentrasi logam Cr pada biota yang ditemukan di Semarang berkisar 0,211 – 0,235 ppm, sedangkan di Tegal berkisar 0,1 – 0,218 ppm. Konsentrasi logam Fe dari biota Semarang berkisar antara 0,718 – 0,909 ppm, sedangkan yang berasal dari Tegal 0,733 – 1,429 ppm. Konsentrasi logam Cr dan Fe pada setiap biota dan lokasi penelitian menunjukan tidak adanya perbedaan sedangkan logam Fe menunjuakn adanya perbedaan.
{"title":"Kontaminasi Logam Cr dan Fe pada Organisme Benthik Laut yang Ditangkap di Perairan Jawa Tengah","authors":"C. A. Suryono, Agus Indardjo","doi":"10.14710/jkt.v26i3.18165","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.18165","url":null,"abstract":"Coastal areas of Semarang and Tegal, there are several industries that use metal materials. These activities will have an impact on the marine ecosystem, especially the biota that lives in it. The research aims to determine the metal contamination of Chromium (Cr) and Iron (Fe) in benthic biota in the waters of Semarang and Tegal, Central Java. Analysis of Cr and Fe concentrations in biota tissues using ICPMS. The results of analysis of Cr and Fe metals in the biota tissues of white shrimp (P. Merguensis), crab (P. pelagicus), coocle (A. inaequivalvis) and gastropods (H. ternatanus) found Cr and Fe metals in the biota tissues. The concentration of Cr metal in biota found in Semarang ranges from 0.211– 0.235 ppm, while in Tegal it ranges from 0.1–0.218 ppm. Fe metal concentrations from Semarang biota ranged from 0.718 – 0.909 ppm, while those from Tegal were 0.733 – 1.429 ppm. The concentrations of Cr and Fe metals in each biota and research location showed no differences, while Fe metals showed differences. Pesisir kota Semarang dan Tegal terdapat beberapa industri yang menggunakan bahan logam. Aktifitas tersebut akan berdampak pada ekosistem laut terutama biota yang hidup didalamya. Penelitian bertujuan mengethui kontaminansi logam Kromium (Cr) dan Besi (Fe) pada biota benthik di perairan Semarang dan Tegal Jawa Tengah. Analisa konsentrasi Cr dan Fe dalam jaringan biota menguunakan ICPMS. Hasil analisa logam Cr dan Fe dalam jaringan biota udang putih (P. Merguensis), rajungan (P. pelagicus), kerang bulu (A. inaequivalvis) dan gastropoda (H. ternatanus) ditemukan logam Cr dan Fe dalam jaringan biota. Konsentrasi logam Cr pada biota yang ditemukan di Semarang berkisar 0,211 – 0,235 ppm, sedangkan di Tegal berkisar 0,1 – 0,218 ppm. Konsentrasi logam Fe dari biota Semarang berkisar antara 0,718 – 0,909 ppm, sedangkan yang berasal dari Tegal 0,733 – 1,429 ppm. Konsentrasi logam Cr dan Fe pada setiap biota dan lokasi penelitian menunjukan tidak adanya perbedaan sedangkan logam Fe menunjuakn adanya perbedaan.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139311717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-28DOI: 10.14710/jkt.v26i3.20451
Galank Fad'qul Janarkho, A. Trianto, S. Sedjati, Rindiani Puja Listari
Shrimp is one of the major aquaculture products in Indonesia. However, shrimp culture faces the peril of Vibriosis, a disease caused by the bacteria genus of Vibrio. Marine sponge-associate microbes are recognized for their potential as sources of antibacterial agent. The fungus Aspergillus sydowii isolate that used in this research originally isolated from marine sponge collected in Lampung Bay. The fungus was grown in various media e. g. Malt extract agar (MEA), MEA-Tempeh broth (MEA-T), and tofu dregs (TD) under various pH (5.5, 7.5, and 9.5). The fungus also be culture as mono-culture and co-culture with Rhizopus sp. The anti-vibrio assay was conducted using disk diffusion method. Based on anti-vibrio assay, the fungus A. sydowii and Rhizopus sp. didn’t show any correlation with the anti-vibrio compound produced. The fungus Rhizopus sp. cultivated in tofu dregs media (TD) at pH 5.5 exhibited the highest potential for inhibiting against V. alginolyticus (5.85±0.24 mm), V. harveyi (5.20±0.20 mm), and V. vulnificus (4.33±0.15 mm), while the co-culture (A. sydowii and Rhizopus sp.) in TD media and pH 7.5 against V. parahaemolyticus (5.55±0.86 mm). The fungus cultured in pH 7.5 can promotes the potential inhibition zone than a pH 9.5.
{"title":"Study on the anti-vibrio activity of marine fungi Aspergillus sydowii and Rhizopus sp. using OSMAC Approach","authors":"Galank Fad'qul Janarkho, A. Trianto, S. Sedjati, Rindiani Puja Listari","doi":"10.14710/jkt.v26i3.20451","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.20451","url":null,"abstract":"Shrimp is one of the major aquaculture products in Indonesia. However, shrimp culture faces the peril of Vibriosis, a disease caused by the bacteria genus of Vibrio. Marine sponge-associate microbes are recognized for their potential as sources of antibacterial agent. The fungus Aspergillus sydowii isolate that used in this research originally isolated from marine sponge collected in Lampung Bay. The fungus was grown in various media e. g. Malt extract agar (MEA), MEA-Tempeh broth (MEA-T), and tofu dregs (TD) under various pH (5.5, 7.5, and 9.5). The fungus also be culture as mono-culture and co-culture with Rhizopus sp. The anti-vibrio assay was conducted using disk diffusion method. Based on anti-vibrio assay, the fungus A. sydowii and Rhizopus sp. didn’t show any correlation with the anti-vibrio compound produced. The fungus Rhizopus sp. cultivated in tofu dregs media (TD) at pH 5.5 exhibited the highest potential for inhibiting against V. alginolyticus (5.85±0.24 mm), V. harveyi (5.20±0.20 mm), and V. vulnificus (4.33±0.15 mm), while the co-culture (A. sydowii and Rhizopus sp.) in TD media and pH 7.5 against V. parahaemolyticus (5.55±0.86 mm). The fungus cultured in pH 7.5 can promotes the potential inhibition zone than a pH 9.5.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"163 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139312039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.14710/jkt.v26i3.19795
Ulina Malau, A. Nugraha, A. Zahid
The survival of fish in the waters is strongly influenced by the availability of food. The purpose of this study was to analyze the types of food for baronang fish and determine the selectivity of food for baronang fish in seagrass ecosystems in Tanjungpinang waters. This research was conducted in May 2023 at three stations, namely Sekatap Waters (ST I), Madong Waters (ST II), and Sebauk Waters (ST III). The research data collection method was carried out by purposive sampling. Fish samples were obtained from catches using 2-inch gill nets. Epiphyte sampling on seagrass leaves was carried out randomly. The total number of fish obtained at station I was 8 fish, 10 fish for station II, and 7 fish for station III. The catches at each station were dissected and collected from their digestive tract and then preserved for analysis in the laboratory. Analysis of the data used is the index of propenderance and electivity index. The results obtained in this study were the type of food for baronang fish (S. gutttatus) found in Tanjungpinang waters consisting of groups of microalgae from the class Bacillariophyceae (Flagilaria, Coscinodiscus, Diatoma, Nitzschia, Gyrosigma, Melosira, Rhizosolenia, and Rhabdonema), Euglenophyceae (Trachelomonas), Dinophyceae (Alexandrium), Chlorophyceae (Closteriopsis), Cyanophyceae (Oscilatoria and Audouinella), Crysophyceae (Vaucheria), Rhodophyceae (Polisiphonia and Bostrychia), group of nematodes from class Secernentea (Hirschmanniella) and Adenophorea (Anaplectus), group of crustaceans from class Branchiopoda (Diaphanosoma), shrimp leg pieces (unidentified), and detritus group. Baronang fish choosing food in their surroundings. Kelangsungan hidup ikan di perairan sangat dipengaruhi oleh ketersediaan makanan. Tujuan penelitian ini adalah untuk menganalisis jenis makanan ikan baronang dan menentukan pemilihan makanan ikan baronang pada ekosistem lamun di perairan Tanjungpinang. Penelitian ini dilaksanakan pada bulan Mei 2023 pada tiga stasiun yaitu di Perairan Sekatap (ST I), Perairan Madong (ST II), dan Perairan Sebauk (ST III). Metode pengambilan data penelitian dilakukan secara purpossive sampling. Sampel ikan diperoleh dari hasil tangkapan menggunakan jaring insang berukuran 2 inchi. Pengambilan epifit pada daun lamun dilakukan secara acak. Total jumlah ikan yang diperoleh pada stasiun I yaitu 8 ekor, stasiun II 10 ekor, dan stasiun III 7 ekor. Hasil tangkapan pada masing-masing stasiun dibedah dan mengambil saluran pencernaannya lalu diawetkan untuk dianalisis di laboratorium. Analisis data yang digunakan yaitu Index of propenderance dan electivity index. Adapun hasil yang didapatkan pada penelitian ini yaitu jenis makanan ikan baronang (S. gutttatus) yang ditemukan di perairan Tanjungpinang terdiri kelompok mikroalga dari kelas Bacillariophyceae (Flagilaria, Coscinodiscus, Diatoma, Nitzschia, Gyrosigma, Melosira, Rhizosolenia, dan Rhabdonema), Euglenophyceae (Trachelomonas), Dinophyceae (Alexandrium), Chlorophyceae (
{"title":"Komposisi Makanan Ikan Baronang (Siganus guttatus) pada Ekosistem Lamun di Perairan Kota Tanjungpinang","authors":"Ulina Malau, A. Nugraha, A. Zahid","doi":"10.14710/jkt.v26i3.19795","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.19795","url":null,"abstract":"The survival of fish in the waters is strongly influenced by the availability of food. The purpose of this study was to analyze the types of food for baronang fish and determine the selectivity of food for baronang fish in seagrass ecosystems in Tanjungpinang waters. This research was conducted in May 2023 at three stations, namely Sekatap Waters (ST I), Madong Waters (ST II), and Sebauk Waters (ST III). The research data collection method was carried out by purposive sampling. Fish samples were obtained from catches using 2-inch gill nets. Epiphyte sampling on seagrass leaves was carried out randomly. The total number of fish obtained at station I was 8 fish, 10 fish for station II, and 7 fish for station III. The catches at each station were dissected and collected from their digestive tract and then preserved for analysis in the laboratory. Analysis of the data used is the index of propenderance and electivity index. The results obtained in this study were the type of food for baronang fish (S. gutttatus) found in Tanjungpinang waters consisting of groups of microalgae from the class Bacillariophyceae (Flagilaria, Coscinodiscus, Diatoma, Nitzschia, Gyrosigma, Melosira, Rhizosolenia, and Rhabdonema), Euglenophyceae (Trachelomonas), Dinophyceae (Alexandrium), Chlorophyceae (Closteriopsis), Cyanophyceae (Oscilatoria and Audouinella), Crysophyceae (Vaucheria), Rhodophyceae (Polisiphonia and Bostrychia), group of nematodes from class Secernentea (Hirschmanniella) and Adenophorea (Anaplectus), group of crustaceans from class Branchiopoda (Diaphanosoma), shrimp leg pieces (unidentified), and detritus group. Baronang fish choosing food in their surroundings. Kelangsungan hidup ikan di perairan sangat dipengaruhi oleh ketersediaan makanan. Tujuan penelitian ini adalah untuk menganalisis jenis makanan ikan baronang dan menentukan pemilihan makanan ikan baronang pada ekosistem lamun di perairan Tanjungpinang. Penelitian ini dilaksanakan pada bulan Mei 2023 pada tiga stasiun yaitu di Perairan Sekatap (ST I), Perairan Madong (ST II), dan Perairan Sebauk (ST III). Metode pengambilan data penelitian dilakukan secara purpossive sampling. Sampel ikan diperoleh dari hasil tangkapan menggunakan jaring insang berukuran 2 inchi. Pengambilan epifit pada daun lamun dilakukan secara acak. Total jumlah ikan yang diperoleh pada stasiun I yaitu 8 ekor, stasiun II 10 ekor, dan stasiun III 7 ekor. Hasil tangkapan pada masing-masing stasiun dibedah dan mengambil saluran pencernaannya lalu diawetkan untuk dianalisis di laboratorium. Analisis data yang digunakan yaitu Index of propenderance dan electivity index. Adapun hasil yang didapatkan pada penelitian ini yaitu jenis makanan ikan baronang (S. gutttatus) yang ditemukan di perairan Tanjungpinang terdiri kelompok mikroalga dari kelas Bacillariophyceae (Flagilaria, Coscinodiscus, Diatoma, Nitzschia, Gyrosigma, Melosira, Rhizosolenia, dan Rhabdonema), Euglenophyceae (Trachelomonas), Dinophyceae (Alexandrium), Chlorophyceae (","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139312972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-10DOI: 10.14710/jkt.v26i3.19817
Lisna E. Cahyani, Kesaulya Irma, S. Haumahu
Primary production in the marine ecosystem depends on the presence of phytoplankton. The presence of phytoplankton is controlled by physical parameters such as salinity and temperature. In order to understand the impact of change of salinity and temperature on the community structure of phytoplankton, especially their abundance and diversity in the waters of Ambon bay, water samples were collected in May and July 2021 at 13 stations and in the layer of 0-10 meters and temperature and salinity were measured simultaneously. Thirty-seven species of phytoplankton were found. The highest number of species were in division Bacillariophyceae (97%), Fragilariophyceae (2%) and Dinophyceae (1%). The most diverse genus was Chaetoceros (8 species). Phytoplankton density ranged from 285 to 302.698 cells.m-3 during sampling I and 292-614.069 cells.m-3 during sampling II. Odontella sinensis and Coscinodiscus radiatus were the highest phytoplankton density during sampling I and II, respectively. Diversity index (Simpson’s diversity index) was maximum at station 1 (sampling I) and station 9 (sampling II). Temperature and salinity show positive and negative correlation, respectively with phytoplankton density. This indicates that changed in salinity and temperature gradient have impact on the community structure of phytoplankton. As phytoplankton plays a key role for the life in marine ecosystem and also indicator for waters quality, it is important to study in depth how the effect of climate change on its community structure either in semi-closed or open ocean. Produksi primer di ekosistem laut dipengaruhi oleh keberadaan fitoplankton dan keberadaan fitoplankton dipengeruhi oleh parameter fisika seperti salinitas dan suhu. Untuk mengetahui dampak dari perubahan salinitas dan suhe terhadap struktur komunitas fitoplankton, terutama kepadatan dan keragaman jenisnya di perairan Teluk Ambon, maka sampel air diambil pada bulan Mei dan Juli 2021 di 13 stasiun penelitian pada lapisan kedalaman 0-10 meter. Suhu dan salinitas diukur secara bersamaan dengan menggunakan CTD. Tiga puluh tujuh spesies fitoplankton ditemukan dan spesies dari devisi Bacillariophyceae ditemukan dalam jumlah yang tertinggi (97%), Fragilariophyceae (2%) dan Dinophyceae (1%). Genus dengan jumlah spesies terbanyak adalah Chaetoceros (8 species). Kepadatan fitoplankton berkisar antara 285 sampai 302.698 sels.m-3 saat sampling I dan 292-614.069 sels.m-3 selama sampling II. Pada sampling I, Odontella sinensis dijumpai dalam jumlah yang banyak sedangkan pada sampling II spesies Coscinodiscus radiatus yang dijumpai dalam jumlah yang banyak. Indeks diversitas (index diversitas Simpson) tertinggi di stasion 1 (sampling I) dan stasion 9 (sampling II). Suhu berkorelasi positif dengan kepadatan fitoplankton sedangkan salinitas berkorelasi negative dengan kepadatan fitoplankton. Hal ini menunjukan bahwa perubahan gradien salinitas dan suhu di perairan Teluk Ambon berpengaruh bagi kedapatan fitoplankton. Seb
{"title":"Pengaruh Perubahan Gradien Suhu dan Salinitas terhadap Struktur Komunitas Fitoplankton di Perairan Teluk Ambon","authors":"Lisna E. Cahyani, Kesaulya Irma, S. Haumahu","doi":"10.14710/jkt.v26i3.19817","DOIUrl":"https://doi.org/10.14710/jkt.v26i3.19817","url":null,"abstract":"Primary production in the marine ecosystem depends on the presence of phytoplankton. The presence of phytoplankton is controlled by physical parameters such as salinity and temperature. In order to understand the impact of change of salinity and temperature on the community structure of phytoplankton, especially their abundance and diversity in the waters of Ambon bay, water samples were collected in May and July 2021 at 13 stations and in the layer of 0-10 meters and temperature and salinity were measured simultaneously. Thirty-seven species of phytoplankton were found. The highest number of species were in division Bacillariophyceae (97%), Fragilariophyceae (2%) and Dinophyceae (1%). The most diverse genus was Chaetoceros (8 species). Phytoplankton density ranged from 285 to 302.698 cells.m-3 during sampling I and 292-614.069 cells.m-3 during sampling II. Odontella sinensis and Coscinodiscus radiatus were the highest phytoplankton density during sampling I and II, respectively. Diversity index (Simpson’s diversity index) was maximum at station 1 (sampling I) and station 9 (sampling II). Temperature and salinity show positive and negative correlation, respectively with phytoplankton density. This indicates that changed in salinity and temperature gradient have impact on the community structure of phytoplankton. As phytoplankton plays a key role for the life in marine ecosystem and also indicator for waters quality, it is important to study in depth how the effect of climate change on its community structure either in semi-closed or open ocean. Produksi primer di ekosistem laut dipengaruhi oleh keberadaan fitoplankton dan keberadaan fitoplankton dipengeruhi oleh parameter fisika seperti salinitas dan suhu. Untuk mengetahui dampak dari perubahan salinitas dan suhe terhadap struktur komunitas fitoplankton, terutama kepadatan dan keragaman jenisnya di perairan Teluk Ambon, maka sampel air diambil pada bulan Mei dan Juli 2021 di 13 stasiun penelitian pada lapisan kedalaman 0-10 meter. Suhu dan salinitas diukur secara bersamaan dengan menggunakan CTD. Tiga puluh tujuh spesies fitoplankton ditemukan dan spesies dari devisi Bacillariophyceae ditemukan dalam jumlah yang tertinggi (97%), Fragilariophyceae (2%) dan Dinophyceae (1%). Genus dengan jumlah spesies terbanyak adalah Chaetoceros (8 species). Kepadatan fitoplankton berkisar antara 285 sampai 302.698 sels.m-3 saat sampling I dan 292-614.069 sels.m-3 selama sampling II. Pada sampling I, Odontella sinensis dijumpai dalam jumlah yang banyak sedangkan pada sampling II spesies Coscinodiscus radiatus yang dijumpai dalam jumlah yang banyak. Indeks diversitas (index diversitas Simpson) tertinggi di stasion 1 (sampling I) dan stasion 9 (sampling II). Suhu berkorelasi positif dengan kepadatan fitoplankton sedangkan salinitas berkorelasi negative dengan kepadatan fitoplankton. Hal ini menunjukan bahwa perubahan gradien salinitas dan suhu di perairan Teluk Ambon berpengaruh bagi kedapatan fitoplankton. Seb","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139321190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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