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  • 1
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2018
    In:  Acta Oceanologica Sinica Vol. 37, No. 12 ( 2018-12), p. 28-34
    In: Acta Oceanologica Sinica, Springer Science and Business Media LLC, Vol. 37, No. 12 ( 2018-12), p. 28-34
    Type of Medium: Online Resource
    ISSN: 0253-505X , 1869-1099
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 2421047-X
    detail.hit.zdb_id: 61207-8
    SSG: 6,25
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  • 2
    Online Resource
    Online Resource
    Institute of Research and Community Services Diponegoro University (LPPM UNDIP) ; 2022
    In:  ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol. 27, No. 2 ( 2022-06-05), p. 111-123
    In: ILMU KELAUTAN: Indonesian Journal of Marine Sciences, Institute of Research and Community Services Diponegoro University (LPPM UNDIP), Vol. 27, No. 2 ( 2022-06-05), p. 111-123
    Abstract: Dinoflagellate cysts have an important role for their bloom dynamics, which are commonly deposited along fine sediment grains and become the source of the next bloom. This study aimed to describe the cyst banks species composition, and their relationship with the sediment particles size and plankton composition in the coast of Pangkajene, South Sulawesi. Cysts observed in this study were extracted from seabed sediments collected from 9 sites. A potential cyst bank, with a cyst density of 240 cysts.g-1 sediment wet weight was found at PK-19, located in proximity to a large harbour complex. Although unusual, cyst density was significantly and positively correlated with the percentage of gravel. In contrast, the diversity of cysts seems to be affected by the percentage of fine sediments, such as silt and clay. None of the sediment composition was found strongly and significantly affecting both cyst density and diversity. A southward increase in cyst density was similar to the trend in the cell density of its planktonic form. Cysts of Protoperidinium spp., Scrippsiella spp., and Pheopolykrikos hartmannii were common and abundant in the sediment. Aside from Protoperidinium spp., most dinoflagellate species found in cyst form were absent from the water column. The occurrence of cysts of harmful dinoflagellates with records of devastating blooms in other coastal areas in Indonesia, such as Margalefidinium polykrikoides, Pyrodinium bahamense, and Gymnodinium catenatum, signifies a need to regularly monitor the area around Pangkajene coast to mitigate impacts of future blooms.
    Type of Medium: Online Resource
    ISSN: 2406-7598 , 0853-7291
    Language: English
    Publisher: Institute of Research and Community Services Diponegoro University (LPPM UNDIP)
    Publication Date: 2022
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  • 3
    In: OLDI (Oseanologi dan Limnologi di Indonesia), National Research and Innovation Agency, Vol. 6, No. 3 ( 2021-12-27), p. 191-
    Abstract: 〈 p class="Papertext" 〉 〈 strong 〉 The Abundance of the Harmful Benthic Dinoflagellate in the Seagrass and Macroalgae Habitats on Pari Island, Thousand Islands, Indonesia. 〈 /strong 〉 Benthic dinoflagellates are an important part of benthic ecosystems and part of their ecological functions. However, ciguatoxin (CTX) producer dinoflagellates, which could cause Ciguatera Fish Poisoning (CFP) disease, is a known threat to marine biota and the island’s coastal communities, such as in Pari Island. Thus, this research aimed is to study the population of five harmful and toxin producer benthic dinoflagellate genera, namely 〈 span style="text-decoration: underline;" 〉 Amphidinium 〈 /span 〉 , 〈 span style="text-decoration: underline;" 〉 Coolia 〈 /span 〉 , 〈 span style="text-decoration: underline;" 〉 Gambierdiscus 〈 /span 〉 , 〈 span style="text-decoration: underline;" 〉 Ostreopsis 〈 /span 〉 , and 〈 span style="text-decoration: underline;" 〉 Prorocentrum 〈 /span 〉 , in macroalgae and seagrass habitats of Pari Island. Benthic dinoflagellate samples were collected in Juni 2019 using artificial substrates in the form of a 10×15 cm nylon screen. Environmental variables, such as nutrient concentration (nitrogen and phosphorus) and water temperature were also measured. The results showed that the average benthic dinoflagellate density in seagrass habitats was four times higher compared to the macroalgae habitats. 〈 em 〉 Gambierdiscus 〈 /em 〉 were found as the most abundant benthic dinoflagellate in seagrass habitats, while 〈 em 〉 Prorocentrum 〈 /em 〉 were more abundant in macroalgae habitats. Principal Component Analysis (PCA) showed that the N:P ratio was the most important regulating parameter for most benthic dinoflagellate genera in this study, except 〈 em 〉 Ostreopsis 〈 /em 〉 , which was found to be more abundant in phosphorus-rich macroalga habitats. The data also shows an increase of benthic dinoflagellate cell density up to seven times compared to the previous research data in 2012 and 2013. That trend indicates an increase in the disturbance and pressure on the macroalgae and seagrass habitats of Pari Island, which require special attention to prevent the occurrence of toxic Benthic Harmful Algal Blooms (bHABs) and CFP cases in the island. 〈 /p 〉
    Type of Medium: Online Resource
    ISSN: 2477-328X
    Language: Unknown
    Publisher: National Research and Innovation Agency
    Publication Date: 2021
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  • 4
    In: Omni-Akuatika, Universitas Jenderal Soedirman, Vol. 16, No. 3 ( 2020-12-30), p. 61-
    Abstract: Energy and electricity demand in Riau Islands is increasing rapidly due to the fast-growing population, urbanization, industrial development, and economic growth. The limitations of energy and electricity in the Riau Islands caused frequent blackouts. To support the high demand for energy and electricity in the Riau Islands, renewable energy is the most suitable alternative energy solution. Renewable energy is not only playing a key role in providing energy but also providing long-term clean and sustainable energy. We investigated the wave energy potential in the Riau Islands Sea in four different consecutive monsoons (North monsoon, East monsoon, South Monsoon and West Monsoon) using ECMWF data during January 2018 to December 2018 with 0.125o x 0.125o and 6 hourly spatial and temporal resolutions. We extracted bathymetry data from NOAA’s database ETOPO1 and forecasting wave characteristics use the SPM (Shore Protection Manual) method. The potential wave energy simulation from significant wave height (Hs) and energy period (Te) was shown in spatial distribution based on different monsoon. Our studies found that the potential wave energy was higher in north monsoon with maximum spatial of wave power density 3.240 – 3.640 kW.m-1. The east monsoon tended to be lower potential wave energy with dominance of wave power density at 0 – 0.127 kW.m-1. Keywords: wave power density, potential wave energy, ECWFM, monsoon
    Type of Medium: Online Resource
    ISSN: 2476-9347 , 1858-3873
    Language: Unknown
    Publisher: Universitas Jenderal Soedirman
    Publication Date: 2020
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  • 5
    In: Frontiers for Young Minds, Frontiers Media SA, Vol. 11 ( 2023-2-24)
    Abstract: Sometimes the waters of seas, rivers, or lakes turn an odd color, becoming brown, red, or green. These colors are actually those of tiny algae that are invisible to the naked eye—but those algae are reproducing so fast that they stain the water. These events are called algal blooms, and they can be harmful because they produce toxins that kill aquatic animals and can cause poisoning in humans. Our group investigated the harmful algal blooms that have been occurring regularly in Lampung Bay, Indonesia, since 2012. We tracked down the algal species responsible for these blooms by analyzing seawater and the seabed sediments of the bay. We identified one species of algae, a dinoflagellate called Margalefidinium polykrikoides , as the culprit. This species can take on multiple shapes, which makes its identification particularly difficult. Improving our knowledge about this algal species will eventually help us understand what triggers harmful algal blooms and how to prevent them.
    Type of Medium: Online Resource
    ISSN: 2296-6846
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2742758-4
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  • 6
    In: Frontiers in Microbiology, Frontiers Media SA, Vol. 10 ( 2019-2-21)
    Type of Medium: Online Resource
    ISSN: 1664-302X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2019
    detail.hit.zdb_id: 2587354-4
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  • 7
    Online Resource
    Online Resource
    National Research and Innovation Agency ; 2021
    In:  OLDI (Oseanologi dan Limnologi di Indonesia) Vol. 6, No. 1 ( 2021-04-28), p. 37-
    In: OLDI (Oseanologi dan Limnologi di Indonesia), National Research and Innovation Agency, Vol. 6, No. 1 ( 2021-04-28), p. 37-
    Abstract: 〈 strong 〉 Distribution and abundance of 〈 em 〉 Pyrodinium bahamense 〈 /em 〉 cyst in the harmful algal blooms risk waters in Indonesia. 〈 /strong 〉 〈 em 〉 Pyrodinium bahamense 〈 /em 〉 as Harmful Algal Blooms (HABs) is one of the rising environmental problems in the coastal areas of Southeast Asia, particularly in Indonesia. Cyst bank formed after the blooms of 〈 em 〉 P. bahamense 〈 /em 〉 is a potential source for the future blooming events. Therefore, an effort to describe the distribution and abundance of 〈 em 〉 P. bahamense 〈 /em 〉 cyst banks in Indonesian coastal waters is necessary as a part of the mitigation strategy against the negative impacts of those toxic dinoflagellate blooms. This study was done as a desk study, which included a literature study, reanalysed of previous research data, and reanalysed of preserved samples or stored raw samples. Data and samples used in this study were collected and analysed from part of past researches in Lampung Bay, Jakarta Bay, Cirebon coastal waters, and Ambon Bay. This study also included an analysis to determine the 〈 em 〉 P. Bahamense 〈 /em 〉 HABs risk level in the studied areas based on the cyst density and distribution data. Results showed a low density of 〈 em 〉 P. bahamense 〈 /em 〉 cyst in Lampung Bay and Jakarta Bay, with cyst density & lt;50 cysts.g 〈 sup 〉 -1 〈 /sup 〉 wet sediment. In contrast, the bottom sediments of Ambon Bay and Cirebon coastal waters contained high cyst density, which reached & gt;1,000 cysts.g 〈 sup 〉 -1 〈 /sup 〉 wet sediment. Based on those data, the 〈 em 〉 P. Bahamense 〈 /em 〉 HABs risk in Jakarta Bay and Lampung Bay would be generally much lower compared to Ambon Bay and Cirebon waters. The existence of cyst banks in those coastal waters may indicate  a possibility of future blooms of 〈 em 〉 P. bahamense 〈 /em 〉 .
    Type of Medium: Online Resource
    ISSN: 2477-328X
    Language: Unknown
    Publisher: National Research and Innovation Agency
    Publication Date: 2021
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