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    Wyświetlanie 1-4 z 4
    Tytuł:
    Variability in fish catch rates associated with Sea Surface Temperature Anomaly (Niño 3.4 index) in the West of Java Sea
    Autorzy:
    Syamsuddin, Mega
    Sunarto, Sunarto
    Yuliadi, Lintang
    Harahap, Syawaludin
    Powiązania:
    https://bibliotekanauki.pl/articles/1076099.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Catch rates
    El Niño
    Java Sea
    La Niña
    oceanographic conditions
    Opis:
    The remotely derived oceanographic variables included sea surface height anomaly (SSHA), sea surface temperature (SST), chlorophyll-a (Chl a) and fish catches are used as a combined dataset to understand the ocean climate variability and further addresses their relations with the fish catches in the West-Java Sea. Fish catches and remotely sensed data are analyzed for the 5 years datasets from 2010-2014 and emphasized the differences of climate conditions during El Niño Southern Oscillation (ENSO) events. Here, we demonstrate the prominent annual variation of two species small pelagic fish catches (Euthynus affinis and Scomberomorus commerson) and one demersal species (Netuma thallasina) as representative of dominant catch in the region. Small pelagic catches had significant increment during El Niño compared to during La Niña events. Changes in oceanographic conditions during ENSO events resulted in perceivable variations in catches, with an average catches of 839.6 t (E. affinis) and 273,7 t (S. commerson) during El Niño. During La Niña event catch rates were reduced with an average catches of 602.6 t (E. affinis) and 210.3 t (S. commerson). During the La Niña event was less favorable for small pelagic catches. In contrast, N. thallasina does not seem to be directly affected by the ENSO. The average catches of N. thallasina during El Niño (182.17 t) lower than during La Niña (250.14 t). This inferred that different climate events might cause different oceanographic conditions that related to fish biodiversity. Our results would benefit the fish biodiversity-management to reduce risks due to climate regimes.
    Źródło:
    World Scientific News; 2019, 117; 175-182
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial characteristics of the Hawksbill (Eretmochelys imbricate Linnaeus, 1766) nesting beach on Kepayang Island, Belitung - Indonesia
    Autorzy:
    Harahap, Syawaludin A.
    Prihadi, Donny J.
    Virando, Gravito E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031644.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Eretmochelys imbricate
    Kepayang Island
    habitat characteristics
    hawksbill
    nesting beach
    Opis:
    Hawksbill sea turtles are scattered in Indonesia, especially on small uninhabited islands and are the only species of turtle most bound to tropical waters. The hawksbill has experienced a drastic decline in population mainly due to bycatch in fishing activities and disturbance of the nesting habitats due to anthropogenic presence. Kepayang Island in Belitung is one of the areas used as hawksbill as a habitat for nesting to laying eggs. To get information about hawksbill on this island, a study was conducted to find out the characteristics of hawksbill nesting beaches on Kepayang Island, Belitung. The survey was carried out in July 2014 and successfully identified 12 nests as an observation sample. Observations show that the coast of Kepayang Island where nesting turtles have a narrow beach width of less than 20 m with a slope of between 10° to 16° and an average intertidal area as wide as 11.5 meters. The texture of sand in the nest is coarse to fine sand which is dominated by fine and medium sand and has a temperature of around 27.7 °C to 30.2 °C measured at the bottom of the nest. The range of sand pH distribution on Kepayang Island is between 6 to 8 with a moisture content of 3.1 to 6.6%. The coastal vegetation formation in Kepayang Island is dominated by Barringtonia and Pescaprae with vegetation in the form of screwpine (Pandanus tectorius), railroad vine (Ipomoea pescaprae) and Barringtonia (Barringtonia asiatica). However, there are predators of turtle eggs and hatchlings, especially water monitor lizards (Varanus salvator), sea birds e.g. brahminy kite (Haliastur indus) and gulls (Chlidonias leucopterus). In general, Kepayang Island has characteristics suitable for hawksbill nesting sites.
    Źródło:
    World Scientific News; 2020, 146; 152-169
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trend of Coastline Change for Twenty Years (1994-2014) in Cirebon, Indonesia
    Autorzy:
    Harahap, Syawaludin A.
    Purba, Noir P.
    Syamsuddin, Mega L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1046538.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cirebon
    Landsat imagery
    MNDWI
    West Java
    coastline change
    erosion
    sedimentation
    Opis:
    There are many factors lead to coastline change, and coastal erosion by the sea-water can lead to the reduction of land areas. Meanwhile, with sedimentation, there will be an increase in landmass. Cirebon, which is part of the northern coastal area of West Java Province, is located on lowland with a dense population and rapid urban development. Several studies have been conducted during the past decade in the coastal areas of Cirebon with research results indicating that most of the coastal areas in Cirebon are subject to landslides at various scales ranging from vulnerable to bad conditions. Based on this, it is necessary to do a study aimed to know the time series trend of coastline change in Cirebon, Indonesia. This study is expected to provide valuable information on the latest conditions of coastal areas in Cirebon, and can be used as a basis for land use and coastal management planning, as areas of potential loss to erosion can be identified and future mitigation of the coastal areas can be undertaken. The configuration of changes in coastline was determined using remotely sensed data of Landsat 7 TM/ETM+ satellite. Imagery data was processed using MNDWI. Accordingly, Cirebon has for twenty years (1994-2014), experienced a significant shift in the coastline. The average value of the coastline advancing toward the sea is 643 meters and coastline setback is 343 meters, or there has been an average shift of the coastline of approximately 986 meters. Meanwhile, over the past twenty years, the length of the coastline has increased by around 2.2 kilometers. The value of coastline onward that is greater than the setback indicates that changes in the coastline in Cirebon tend to experience accretion. Conclusively, Cirebon’s coastline changes show an increasing trend in length and domination by the accretion (sedimentation) process.
    Źródło:
    World Scientific News; 2019, 138, 2; 79-92
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surficial Sedimentary at the Bottom in Waters Surrounding the Arisen Land of Putri Island, Karawang - Indonesia
    Autorzy:
    Harahap, Syawaludin A.
    Yuliadi, Lintang P. S.
    Sinulingga, John N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031415.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Arisen land
    Cikiong Beach
    Putri Island
    deltaber
    grain size
    kummod-sel
    phi (φ) scale
    sedimentation
    surficial sedimentary
    Opis:
    This study was conducted in July 2016 around Putri Island and Cikiong Beach, Batujaya District, Karawang Regency, West Java - Indonesia to know the types of surficial sedimentary that makeup Putri Island. Field survey activities were carried out to collect sediment samples using a 1-meter long piston core. The sampling locations were carried out at five stations by considering representativeness and ease of accessibility. Sediment analysis using the sieve or granulometric method to produce grain size information on the phi (φ) scale. Sediment types were classified based on grain size using the Wentworth scale and followed by the Folk’s ternary diagram. The study results show that the sediment covering the bottom of the waters around Putri Island is composed of seven types of sediment, namely gravel, very coarse sand, coarse sand, medium sand, fine sand, very fine sand, and silt. It can be seen that sand dominates the sediment fraction which reaches 94% followed by 4% mud and 2% gravel. If classified based on the main component of the Folk’s ternary diagram, the seabed of this area has three types of sediment textures, namely slightly gravelly sand [(g) S], Sand [S], and gravelly sand [gS]. Judging from the constituent elements of the sediment, it can be said that the sedimentation that occurs in the study location is composed of alluvial deposits. The formation of this sediment is dominated by material carried by the river flow through fluvial and tidal processes.
    Źródło:
    World Scientific News; 2021, 151; 95-109
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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