The use of ammonia-elphidium (A-E) index in Jakarta Bay and Semarang coastal waters, Indonesia

Rositasari, Ricky; Puspitasari, Rachma; Suratno, Suratno; Purbonegoro, Triyoni

doi:10.1063/1.5134607

Cited by 6 publications

(7 citation statements)

References 8 publications

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“…Teluk Jakarta merupakan perairan subur yang diindikasikan oleh kelimpahan fitoplankton (Damar, 2012) dan benthos (Hartati & Awwaluddin, 2007). Teluk Jakarta mempunyai berbagai ekosistem antara lain; hutan bakau, padang lamun dan terumbu karang serta berbagai jenis biota ekonomis (Rositasari et al, 2017).…”

Section: Pendahuluanunclassified

Kepadatan Stok, Komposisi Jenis, Struktur Ukuran dan Daerah Penangkapan Ikan di Teluk Jakarta

Wagiyo¹,

Prihatiningsih²,

Hartati³

2021

jurnalDRD

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Jakarta Bay has a variety of biota as a fishery resource, the utilization of which is continuous intensively. this study aims to obtain the data and information on stock density, species composition, size structure and fishing ground. The research was conducted by means of exploration and observation in 2016. The results showed that the average stock density in Jakarta Bay was 11,400 kg/km2 and in the Seribu Islands 25,500 kg/km2. Stock density distribution based on vertical coastline is obtained; mouth part 13,925 kg/km2, middle 11,709 kg/km2 and the coast 8,326 kg/km2. Coastal horizontal distribution; West area 15,311 kg/km2, Central 9,256 kg/km2 and East 9,259 kg/km2. Based on area in the Seribu Islands 25,500 kg/km2, Jakarta Bay 11,320 kg/km2 and Tangerang 11,610 kg/km2. Stock composition includes; demersal fish 84.53%, Cephalopods 9.98%, Crustaceae 4.32% and others. The fishing area of gill nets is wider and more spread out than other fishing gear.

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Section: Pendahuluanunclassified

Kepadatan Stok, Komposisi Jenis, Struktur Ukuran dan Daerah Penangkapan Ikan di Teluk Jakarta

Wagiyo¹,

Prihatiningsih²,

Hartati³

2021

jurnalDRD

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“…Dasar laut perairan Teluk Jakarta yang terdiri dari substrat pasir berlumpur dan semakin menengah dengan kondisi substrat lumpur berpasir (Harti, 2009, Rositasari et al, 2015. Ongkosongo et al, (1980) dalam Rositasari et al, (2017). Temuan dari penelitian tersebut menunjukkan bahwa pertumbuhan sedimentasi di muara Sungai Cisadane adalah sebesar 7,2 m/tahun dan Sungai Citarum sebesar 48,5 m/tahun.…”

Section: Hasil Dan Pembahasan Kondisi Morfologi Dan Fisiografis Peraiunclassified

Deteksi Perubahan Garis Pantai Teluk Jakarta Bagian Timur Tahun 2003-2018

Hidayah¹,

Apriyanti

2020

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Jakarta Bay is one of the coastal areas with dynamic changes in its coastal environment. This is caused by the location of the bay which is the estuary of several large rivers that flow from the West Java region. One of the dynamics parameters of the coastal environment that can be observed temporarily is the change in the shoreline. The study aimed to analyze the changes in the shoreline caused by abrasion and sedimentation in the eastern part of Jakarta Bay. Multitemporal satellite images (2003, 2010, and 2018) were downloaded from the Google Earth application. On-screen digitation was applied to extract coastline features. Coastlines from different years were then overlayed to measure the magnitude of the changes using ArcGIS 10.3 software. The results of the overlay process showed that during the last 15 years, abrasion has taken place covering 37,6 Ha and sedimentation covering 90,7 Ha. The rapid development of coastal areas in the Jakarta Bay also resulted in reclamation land covering an area of 100,2 Ha.

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“…Gambar 3. (a) Indeks A-E di pesisir barat Teluk Jakarta; (b) Nilai indeks A-E di pesisir timur Teluk Jakarta (Rositasari & Suyarso, 2014 (Rositasari et al, 2019). Dasar perairan pesisir Tangerang sejak lebih dari 100 tahun yang lalu telah mengalami hipoksia, peningkatan tajam terjadi pada akhir 1990an hingga beberapa tahun terakhir mencapai nilai indeks 90 (Gambar 5).…”

Section: Penggunaan Indeks Ae Sebagai Proksi Hipoksiaunclassified

“…Gejala awal hipoksia di pantai Cilingcing terjadi pada tahun 1940an, meningkat secara dramatik pada tahun 1960an namun masih pada tingkat yang lebih rendah daripada perairan Tangerang. Di muara Banjir kanal timur (BKT), Semarang penipisan oksigen terjadi pada tingkat yang lebih tinggi daripada perairan Tanggerang dengan kisaran nilai indeks 70 hingga 100, sejak akhir 1940an hingga beberapa tahun terakhir (Rositasari et al, 2019).…”

Section: Penggunaan Indeks Ae Sebagai Proksi Hipoksiaunclassified

Ancaman Hipoksia Bagi Ekosistem Pesisir; Penggunaan Indeks Ammonia-Elphidium (A-E) Sebagai Proksi

Rositasari

2020

oseana

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Hypoxia is one of the aquatic phenomena caused by natural and/or anthropogenic factors. Eutrophication is the main trigger of hypoxia in coastal waters throughout the hemisphere. Hypoxia that occurs in aquatic ecosystems refers to the low concentration of dissolved oxygen in the water column to less than 2 mg/L. Hypoxia causes a double effect, low oxygen supply for biotic physiological process, and triggers ocean acidification. Prolonged hypoxic conditions will have a significant impact on the food webs in coastal waters and sea waters, further conditions will ultimately have an impact on capture-based fishing activities. The case of hypoxia in Indonesian coastal waters has not been widely revealed and has not been a concern to be understood or traced to its existence. Retrospective as well as actual traces of hypoxia were revealed, especially in the waters of Jakarta Bay. The retrospective study was carried out using proxies that have been used in various tropical and subtropical countries, the Ammonia-Elphidium (A-E) index (Foraminifera). The results show that several places in the coastal waters of Jakarta Bay and Semarang have experienced episodic hypoxic events for several centuries. A brief review of phenomenal hypoxic events in other parts of the world and preliminary information on recorded events in several Indonesian coastal waters are expected to open stakeholder awareness about further threats of hypoxia in Indonesian waters.

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The use of ammonia-elphidium (A-E) index in Jakarta Bay and Semarang coastal waters, Indonesia

Cited by 6 publications

References 8 publications

Kepadatan Stok, Komposisi Jenis, Struktur Ukuran dan Daerah Penangkapan Ikan di Teluk Jakarta

Kepadatan Stok, Komposisi Jenis, Struktur Ukuran dan Daerah Penangkapan Ikan di Teluk Jakarta

Deteksi Perubahan Garis Pantai Teluk Jakarta Bagian Timur Tahun 2003-2018

Ancaman Hipoksia Bagi Ekosistem Pesisir; Penggunaan Indeks Ammonia-Elphidium (A-E) Sebagai Proksi

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