Ostracoda From Subsurface Sediments of Karimata Strait as Indicator of Environmental Changes

Dewi, Kresna Tri; Rahardiawan, Riza

doi:10.32693/bomg.29.1.2014.60

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…Taking into account, the present geographical position and bathimetry (more than 30 m deep) of the core site, shallow neritic environment should have occupied the site since the early deposition of the core ca 1,800 yr B.P. The presence of shallow marine benthic foraminifers (Dewi, 2014) supports this argument, and proves that mangroves have been away from the core site when the core was firstly deposited. This study shows fifteen genera of benthic foraminifers identified in samples were taken from Zone 1.…”

Section: Pollen Assemblages and Environmental Changessupporting

confidence: 52%

Late Holocene Pollen Record of Environmental Changes in Karimata Strait, Sunda Shelf Region

Yulianto

Sukapti²,

Dewi³

2019

Indonesian J. Geosci.

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Pollen analysis has been conducted on a 90 cm gravity core taken from the Karimata Strait to reveal pollen facies in marine sediment and Late Holocene environmental changes in the central Sunda Shelf region. The core site is at 32 m water depth and located about 170 km northwest of Bangka Island, Indonesia. Ten samples were collected at 10 cm intervals through the core. The total number of pollen grains counted in the samples varies between very low (<50 grains) to abundant (>200 grains). High frequencies (50-70%) of mangrove pollen are found at 90 to 40 cm indicating that pollen facies in offshore marine sediment may be comparable with those in mangrove forest floor sediment. The core site has been in a neritic environment since its early deposition ca. 1,800 yr B.P. (~150 A.D.) when mangroves vastly grew on the tidal flats of the surrounding islands and they persisted to ca. 700 yr B.P. (~1,250 A.D.). In the middle of this period, a catastrophic event speculatively due to the 535 A.D. Krakatau eruption might have responsible for the decrease of mangroves and the disappearance of benthic foraminifers. The deposition of silicious materials (tephra) due to this eruption might have provided an opportunity for benthic foraminifers to increase their population subsequently. From ca. 700 yr B.P. (~1,250 A.D.) mangroves declined, as indicated by lower frequencies of pollen grain in samples from 30 cm deep upward. It occurred simultaneously with the deposition of coarser sediment and the increase of benthic foraminifer abundance. Interplay of anthropogenic activities, strengthening ENSO cycle, and lowering erosion base level might have been responsible for these environmental changes.

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Section: Pollen Assemblages and Environmental Changessupporting

confidence: 52%

Late Holocene Pollen Record of Environmental Changes in Karimata Strait, Sunda Shelf Region

Yulianto

Sukapti²,

Dewi³

2019

Indonesian J. Geosci.

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“…Selain kedua spesies tersebut, beberapa genus yang hadir cukup melimpah di sebagian besar sampel adalah genus Foveoleberis, Pistocythereis, Pylectonophora, Cytherella, Loxoconcha dan Cytherelloidea. Penelitian Dewi (1993Dewi ( & 2000 di perairan utara Laut Jawa dan perairan selatan Kalimantan Selatan mengungkapkan bahwa kehadiran genusgenus tersebut mengindikasikan distribusi ostracoda masih berada dalam satu wilayah persebaran yang sama. Kehadiran genus-genus tersebut cukup umum di perairan Laut Jawa hingga bagian selatan Pulau Kalimantan.…”

Section: Hasil Dan Pembahasanunclassified

“…Kehadiran genus-genus tersebut cukup umum di perairan Laut Jawa hingga bagian selatan Pulau Kalimantan. Beberapa spesies dari genus tersebut, di antaranya spesies Foveoleberis cypraeoides, bahkan menjadi spesies endemik perairan wilayah Indo-Malaysia yang juga ditemukan melimpah di sekitar perairan Selat Malaka dan Singapura (Dewi, 2000).…”

Section: Hasil Dan Pembahasanunclassified

Sebaran ostracoda sebagai bioindikator kondisi perairan lepas pantai Balikpapan, Kalimantan Timur

Wibowo,

Kurniasih,

Suprapto

et al. 2024

MGI

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Abstrak Perairan lepas pantai Balikpapan memiliki kerentanan tinggi terhadap perubahan kualitas air yang diakibatkan sedimentasi di sekitar kawasan tersebut. Oleh sebab itu, penelitian mengenai kondisi lingkungan perairan di daerah ini penting dilakukan. Salah satu bioindikator yang dapat digunakan untuk menentukan kualitas perairan adalah ostracoda, yang merupakan mikroorganisme dari jenis Crustacea. Penelitian ini dilakukan di selatan Teluk Balikpapan menggunakan data kemelimpahan ostracoda dalam sedimen Resen pada 25 sampel permukaan dasar laut. Tujuan penelitian ini adalah untuk mengetahui kondisi lingkungan perairan di area penelitian berdasarkan distribusi ostracoda. Hasil penelitian menunjukkan kemelimpahan ostracoda semakin rendah ke arah perairan laut terbuka, dan dari tingkat keanekaragamannya diketahui kondisi perairan tergolong stabil. Hasil analisis cluster membagi area penelitian menjadi dua biotop yakni Biotop1, merupakan lingkungan laut dangkal dengan spesies penciri Cytherella semitalis, Cytherelloidea sp., Phlyctenophora orientalis dan Neomonoceratina indonesiana; Biotop2, berasosiasi dengan lingkungan terumbu karang ditandai dari kehadiran spesies Bairdopillata paraalcyonicola, Paranesidea sp., dan Loxoconcha sp. Abstract The offshore waters of Balikpapan considered as vulnerable in term of changes in water quality due to high sedimentation. Therefore, research on the condition of the aquatic environment in this area is necessary. One bioindicator that can be used to determine water quality is ostracods, the Crustacean microorganisms that commonly found in the seabed sediments. This research was conducted in southern Balikpapan Bay using ostracod abundance in Recent sediments on 25 seabed surface samples. The aim of this research is to determine the condition of the aquatic environment based on the distribution of ostracods. The results show that the abundance of ostracods is lower towards open sea waters, and from the level of diversity it is known that water conditions are relatively stable. The results of the cluster analysis divided the research area into two biotopes, Biotope1, a shallow marine environment with the diagnostic species Cytherella semitalis, Cytherelloidea sp., Phlyctenophora orientalis and Neomonoceratina indonesiana; Biotope2, associated with coral reef environments, is characterized by the presence of Bairdopillata paraalcyonicola, Paranesidea sp., and Loxoconcha sp.

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“…Respon mikrofauna tersebut tidak terbatas pada kelimpahan dan cangkang abnormal namun juga dapat dilihat dari kandungan kimia dan perubahan warna cangkang. Dewi (2014) Hasil pengolahan data berdasarkan Hammer dkk.,(2001) ditampilkan pada Tabel 2. Jumlah taksa antara 1 (BL16-001) dan 26 (BL16-10).…”

Section: Pendahuluanunclassified

Respon Mikrofauna (Ostracoda) Terhadap Kondisi Lingkungan Sekitar Pulau Bangka, Sulawesi Utara

Dewi

Latuputty

Priohandono

et al. 2017

JGK

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ABSTRAKOstracoda merupakan kelompok mikro-organisme yang dapat terawetkan dalam sedimen dasar laut, termasuk dasar perairan sekitar Pulau Bangka, Sulawesi Utara. Pulau ini terkenal akan keindahan alam bawah laut dan penambangan bijih besi di kawasan pesisir. Perubahan lingkungan di pesisir tersebut secara tidak langsung berpengaruh terhadap kondisi dasar perairan laut sebagai habitat biota. Tujuan dari penelitian ini adalah untuk mengetahui respon ostracoda terhadap perubahan lingkungan perairan tersebut. Studi ini menggunakan 10 sampel sedimen dasar laut hasil cucian dilanjutkan dengan analisa mikropaleontologi (tahap penjentikan, identifikasi spesies, penghitungan spesimen dari setiap spesies, pengolahan data, dokumentasi spesimen) dan analisa sedimentologi (SEM-EDX). Keterdapatan Bairdopillata, Neonesidea, Paranesidea dan Quadracythere (BL16-010) yang hidup berasosiasi dengan kondisi terumbu karang mencerminkan suatu perairan dalam kondisi cukup bagus. Di titik lokasi lain (BL16-015 dan BL16-030) ditemukan mikrofauna dengan cangkang abnormal (rusak, kehitaman) yang mengandung C (59-86%), Al 2 O 3 (2%), SiO 2 (1-7%), dan MnO (2%). Dijumpainya cangkang abnormal merupakan salah satu respon mikrofauna terhadap perubahan lingkungan di daerah penelitian. ABSTRACTOstracoda is a group of micro-organism that could be preserved in marine sediments, including on the seafloor of Bangka Island, North Sulawesi. This island is famous as beautiful underwater place and iron mining in the coastal area. The environmental changes in the coastal area indirectly influence the seafloor condition as biotic habitats. The purpose of this study is to know the response of ostracoda to this coastal environmental change. This study used ten washed residue of surface sediment samples followed by micropaleontological analysis (picking, identification of species, specimen calculation every species, data processing, specimen documentation), and sedimentological analysis (SEM-EDX). The occurrences of Bairdopillata, Neonesidea, Paranesidea dan Quadracythere (BL16-010) that associated with coral reef communities reflect a good marine condition. In another sampling location (BL16-015 and BL16-030), it is found abnormal microfaunas (broken, blackish) that composed of C (59-86%), Al 2 O 3 (2%), SiO 2 (1-7%), and MnO (2%). The finding of these abnormal shells is one of the microfaunal response to environmental changes in the study area.

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Ostracoda From Subsurface Sediments of Karimata Strait as Indicator of Environmental Changes

Cited by 3 publications

References 4 publications

Late Holocene Pollen Record of Environmental Changes in Karimata Strait, Sunda Shelf Region

Late Holocene Pollen Record of Environmental Changes in Karimata Strait, Sunda Shelf Region

Sebaran ostracoda sebagai bioindikator kondisi perairan lepas pantai Balikpapan, Kalimantan Timur

Respon Mikrofauna (Ostracoda) Terhadap Kondisi Lingkungan Sekitar Pulau Bangka, Sulawesi Utara

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