scholarly journals DISTRIBUSI FORAMINIFERA BENTIK DI PERAIRAN ACEH

2016 ◽  
Vol 12 (1) ◽  
pp. 25
Author(s):  
Nazar Nurdin ◽  
Imelda R. Silalahi
Keyword(s):  
Indian Ocean ◽  
Water Depth ◽  
Surface Sediment ◽  
Benthic Foraminifera ◽  
Environmental Changes ◽  
Sensitive Indicator ◽  
Sediment Samples ◽  
Strong Current ◽  
Reef Environments ◽  
The Indian Ocean

Perairan Aceh termasuk Pulau Weh, Pulau Breuh dan Pulau Penasi merupakan area terluar di sisi barat Kepulauan Indonesia yang menghadap ke Samudera Hindia. Wilayah ini sangat menarik bagi para peneliti terutama setelah kejadian tsunami pada tahun 2004. Tujuan dari penelitian adalah untuk mengetahui distribusi foraminifera sebagai organisme yang sensitif terhadap perubahan lingkungan. Sebanyak 32 contoh sedimen diambil pada kedalaman 7- 170 meter dan terpilih 11 contoh untuk studi foraminifera. Hasil penelitian menunjukkan bahwa ada 45 spesies foraminifera bentik yang sangat berlimpah, terdiri atas 28 spesies anggota Subordo Rotaliina, Miliolina (7 spesies) dan Textulariina (10 spesies). Amphistegina papilosa dijumpai dalam jumlah sangat berlimpah dan tersebar merata yang memberi indikasi kondisi lingkungan terumbu karang baik. Ammonia tepida sangat dominan (47%) di sebelah utara Pulau Weh (S30) dibandingkan dengan spesies lain. Di bagian Timur Pulau Penasi, ditemukan cangkang foraminifera dalam kondisi rusak dalam jumlah berlimpah yang dapat dikaitkan dengan arus kuat di lokasi ini. Kata kunci : foraminifera bentik, distribusi, perairan Aceh The Aceh waters including Weh, Breuh and Penasi islands are the outer parts of northwestern Indonesia that facing the Indian Ocean. This area is interested for many scientists especially after tsunami in 2004. The purpose of this study is to establish the distribution of benthic foraminifera as a sensitive indicator of environmental changes. Thirty two (32) surface sediment samples were collected at the water depth of 7-170 m and eleven samples were selected for foraminiferal study. The results show 45 species of benthic foraminifera very abundantly and consists of 28 species belong to Suborder Rotaliina, Miliolina (7 species) and Textularia (10 species). Amphistegina papilosa is found abundantly and widely distribution that provide an indication of good reef environments. Ammonia tepida is very dominant(47%) in the northern part of Weh island compared with other species. Abnormal shells of foraminifera were found abundantly in the eastern part of Penasi Island that related to strong current in this area. Keywords: benthic foraminifera, distribution, Aceh waters

Lower Cretaceous Deep-Water Benthic Foraminifera of the Indian Ocean

1998 ◽  
Vol 44 (2) ◽  
pp. 209
Author(s):  
W. A. Berggren ◽  
Anne E. L. Holbourn ◽  
Michael A. Kaminski
Keyword(s):  
Indian Ocean ◽  
Deep Water ◽  
Benthic Foraminifera ◽  
Lower Cretaceous ◽  
The Indian Ocean

Port town and its harbors: sedimentary proxies for landscape and seascape reconstruction of the Greco-Roman site of Berenike Trogodytica on the Red Sea coast of Egypt

2018 ◽  
Vol 26 (2) ◽  
pp. 61-92 ◽  
Author(s):  
Anna M. Kotarba-Morley
Keyword(s):  
Indian Ocean ◽  
Red Sea ◽  
Environmental Changes ◽  
Greco Roman ◽  
The Indian Ocean ◽  
Geographical Position ◽  
Red Sea Coast ◽  
Trade And Exchange ◽  
Changing Role ◽  
Sea Coast

Berenike Trog<l>odytica was one of the key harbours on the Red Sea coast during the Ptolemaic and Roman periods and was a major trade and exchange hub connecting the Indian Ocean and the Mediterranean. Berenike’s geographical position was extraordinarily propitious owing partly to its natural harbours, protected against the prevailing northern winds, as well as its location in the vicinity of an ancient viewshed, the large peninsula of Ras Benas. This paper discusses how multifaceted geoarchaeological approaches to the study of ancient ports can contribute to a better understanding of the mechanisms and logistics of maritime trade, as well as fluctuations in its quality and quantity. It also sheds new light on the significance of the effect that local and regional palaeoclimatic, landscape, seascape and environmental changes had on the development and decline of the port, and its changing role within the Red Sea–Indian Ocean maritime network.

scholarly journals The Occurrence and Distribution of Benthic Foraminifera in Tropical Waters Along the Strait of Malacca

2021 ◽  
Vol 8 ◽  
Author(s):  
Fatin Izzati Minhat ◽  
Suresh M. Ghandhi ◽  
Nurul Syahirah Mohd Ahzan ◽  
Norizmaira Abdul Haq ◽  
Omar Abdul Rahman Abdul Manaf ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Depth ◽  
Benthic Foraminifera ◽  
Tropical Waters ◽  
Cluster Group ◽  
Group A ◽  
Average Water ◽  
Indian Ocean North ◽  
The Indian Ocean ◽  
Strait Of Malacca

Foraminifera are shelled single-celled protists that are found in all marine environments. Benthic foraminifera either live in sediments or attach to surfaces on the seafloor. Understanding the distribution and ecological response of benthic foraminifera is crucial, as they can indicate past and current ocean conditions. However, the benthic foraminifera distribution along the busy Strait of Malacca, which connects the Indian Ocean (north) to the Java Sea (south), is undersampled. In this study, we collected 24 surface samples from the northern Strait of Malacca to understand the distribution of foraminifera assemblages in shallow tropical waters. A total of 49 species of benthic foraminifera were identified. Calcareous hyaline species dominated the assemblages, with an extremely low occurrence of calcareous porcelaneous species. The common calcareous hyaline taxa were Asterorotalia pulchella, Pseudorotalia schroeteriana, Discorbinella bertheloti, Ammonia tepida, and Heterolepa praecincta. Cluster analysis categorised the foraminiferal assemblages into three major groups. The first cluster (Group A) consisted of a more diverse assemblage of hyaline and agglutinated species that inhabited a mean water depth of 45 m. The second cluster represented a population that inhabited deeper water environments (average water depth of 59 m). Finally, the third cluster (Group C) consisted of a foraminifera assemblage that inhabited shallow coastal environments (average depth of 22 m) with higher organic matter enrichment. The multivariate canonical correspondence analysis (CCA) showed that the foraminiferal assemblages reflected the shallow to deep water transition in the Malacca Strait. Water depth, which defines the depositional environment, had a greater influence on foraminifera distribution here than organic matter and salinity.

scholarly journals Distribution and Diversity of Foraminifera in the Northwest of Sarawak Offshore Waters, Malaysia

2019 ◽  
Vol 1 (2) ◽  
pp. 19-25
Author(s):  
Wan Nur Syarah Binti Wan Muhamed Sabri ◽  
Omar Abdula Rahman Abdul Manaf ◽  
Fatin Izzati Minhat
Keyword(s):  
Water Depth ◽  
Benthic Foraminifera ◽  
Surface Sediments ◽  
Sediment Samples ◽  
The Common ◽  
Index Value ◽  
Main Factor

A study on distribution and diversity of benthic foraminifera in surface sediments was carried out in Northwestern Sarawak waters, Malaysia. The range of water depth at the study site was between 43 m and 71 m. A total of seven sediment samples were taken for this study. As a result, 11 genera were identified from a total of 1,222 individuals of foraminifera. 200 individuals were picked out from each sample. The 11 genera that were identified from the study site included Heterolepa spp., Textularia spp., Quinqueloculina spp., Operculina spp. Pseudorotalia spp., Amphistegina spp., Cylindroclavulina spp., Elphidium spp., Ammobaculites spp., Asterorotalia spp. and Bolivina spp.. The common genera found in the sediments of the study areas were Heterolepa, Textularia, Quincoloculina, Operculina and Pseudorotalia. The highest and lowest values of Fisher alpha and Shannon-Wiener indices were shown at Station C287 and Station B482 respectively. The highest value of Fisher alpha was 3.23 and the lowest value was 1.97.  The highest and lowest values of Shannon-Wiener were 2.30 and 1.91. The highest index value of diversity was 3.23 at depth 67.76 m and the lowest value was 1.53 at depth 45.54 m and 68.45 m. From this study, depth is not the main factor that influences the diversity of benthic foraminiferal in northwestern Sarawak waters.

scholarly journals FORAMINIFERA DI PERAIRAN SEKITAR BAKAUHENI, LAMPUNG (SELAT SUNDA BAGIAN UTARA)

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Luli Gustiantini ◽  
Kresna Tri Dewi ◽  
Ediar Usman
Keyword(s):  
Surface Sediment ◽  
Benthic Foraminifera ◽  
Main Group ◽  
Bottom Current ◽  
The West ◽  
Current Pattern ◽  
Sediment Samples ◽  
West Part ◽  
Abundance And Diversity

Penelitian foraminifera bentik dari 15 percontoh sedimen dasar laut di bagian utara Selat Sunda, Perairan Bakauheni, Lampung telah dilakukan secara kuantitatif. Keterdapatan foraminifera bentik di daerah penelitian sangat melimpah dan bervariasi yaitu terdiri dari 142 spesies (65 genera) yang diidentifikasi dari 7.799 spesimen. Berdasarkan penelitian ini diperoleh bahwa kelimpahan dan komposisi spesies foraminifera di bagian timur (sekitar Bakauheni) cenderung lebih tinggi (rata-rata 6,24%) dibandingkan dengan bagian barat (rata-rata 4,7%) daerah penelitian. Hal ini kemungkinan dapat dikaitkan dengan arah pergerakan arus dasar laut yang bekerja di daerah penelitian. Keanekaragaman foraminifera bentik tertinggi terdapat pada titik lokasi BHL-36 yang terletak di bagian barat daerah penelitian dan terdiri dari 104 spesies. Kelimpahan tertinggi (10,07%) terdapat pada titik lokasi BHL-25 yang terletak tidak jauh dari Pelabuhan Bakauheni dan didominasi oleh spesies tertentu yang dapat bertahan hidup. Subordo Rotaliina merupakan kelompok utama di daerah penelitian yang dicirikan oleh genera Asterorotalia, Operculina, dan Elphidium. Benthic foraminifera from fifteen surface sediment samples in the northern part of Sunda Strait, Bakauheni Waters, Lampung have been analysed quantitatively. The occurrences of benthic foraminifera in the study area are very abundance and varied, it comprises of 142 species (65 genera), which is identified from 7,799 specimens. Based on this research, it is resulted that the abundance and diversity of foraminifera in the east (around Bakauheni) are higher (average of 6.24%) than in the west (average of 4,7%) of the study area. It may relate to bottom current pattern that work in the study area. The highest diversity of benthic foraminifera occurs at site BHL-36, which lies in west part of the study area and it comprises of 104 species. The highest number of individu (10.07%) occurs at the site of BHL-25, which is close to Bakauheni Harbour and it is dominated by certain survived species. Subordo Rotaliina is the main group found in the study area that is characterized by genera of Asterorotalia, Operculina, and Elphidium.

scholarly journals A humid early Holocene in Yemen interpreted from palaeoecology and taxonomy of freshwater ostracods

2018 ◽  
Vol 37 (1) ◽  
pp. 167-180
Author(s):  
Munef Mohammed ◽  
Peter Frenzel ◽  
Dietmar Keyser ◽  
Fadhl Hussain ◽  
Abdulkareem Abood ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Early Holocene ◽  
Monsoon Precipitation ◽  
Sediment Samples ◽  
The Indian Ocean ◽  
Marsh Sediments ◽  
Southern Arabia ◽  
First Time ◽  
The Village ◽  
Freshwater Ostracods

Abstract. Lake or marsh sediments in the Qa'a Jahran–Dhamār area indicate a period of higher moisture availability in the early Holocene of the highlands of Yemen. Forty-two marl–peat sediment samples from eight stratigraphic sections of that area have been collected and are examined for the first time for their ostracod associations. Eight species belonging to seven genera and four families are reported. Their ecological tolerances and preferences are used to investigate the climatic and environmental changes in the early to mid-Holocene. Our data are compared and correlated with previous archaeological results, particularly from the region of Qa'a Jahran (Dhamār) in the vicinity of the village of Beyt Nahmi. We conclude that the wettest period of the Holocene was from about 7900 to 7400 cal yr BP, when northwards incursion of the Indian Ocean Monsoon caused intensified monsoon precipitation over southern Arabia.

scholarly journals Foraminiferal Assemblage from the Karai Shale, Uttattur Group, Southern India

2019 ◽  
pp. 1-6
Author(s):  
L. Harini ◽  
R. Venkatachalapathy
Keyword(s):  
Surface Sediment ◽  
Benthic Foraminifera ◽  
Southern India ◽  
Foraminiferal Assemblage ◽  
Planktic Foraminifera ◽  
Specific Identification ◽  
Sediment Samples ◽  
Foraminiferal Species

To study the foraminiferal assemblage from the Karai shale, one hundred and nineteen surface sediment samples were collected systematically. The collected samples were processed using standard micropaleontological techniques. Ninety- eight species of well - preserved foraminifera were obtained from the samples. Of the ninety-eight species, eighty-nine were benthic foraminifera and nine were planktic foraminifera. The specific identification of the foraminifera was done after comparing them with those described and illustrated by various workers from the Cretaceous of Southern India. The age of the samples was assigned as Albian based on the presence of planktic foraminiferal species viz. Hedbergella delrioensis, Hedbergella planispira, Praeglobotruncana delrioensis, Praeglobotruncana stephani, Planomalina buxtorfi and Thalmanninella balernaensis.

scholarly journals SEBARAN SPASIAL FORAMINIFERA DALAM KAITANNYA DENGAN KEDALAMAN LAUT DAN JENIS SEDIMEN DI TELUK BONE, SULAWESI SELATAN

2016 ◽  
Vol 11 (3) ◽  
pp. 165
Author(s):  
Kresna Tri Dewi ◽  
Eko Saputro
Keyword(s):  
Spatial Distribution ◽  
Water Depth ◽  
Surface Sediment ◽  
Sediment Type ◽  
Sediment Samples ◽  
South Sulawesi ◽  
Sediment Types ◽  
Distribution Water

Sebanyak 25 sampel sedimen dasar laut dari Teluk Bone bagian utara, Sulawesi Selatan telah digunakan untuk analisis foraminifera dalam kaitannya dengan jenis sedimen dan kedalaman. Hasil analisis diperoleh 97 spesies foraminifera bentik dan beberapa genera diantaranya mendominasi titik lokasi tertentu, seperti Amphistegina, Operculina, Heterolepa, Brizalina, Elphidium dan Quinqueloculina.Setiap genus mempunyai distribusi spasial tertentu sesuai habitatnya dengan beberapa anomali. Kisaran kedalaman daerah penelitian antara 23 dan 85 m dicirikan oleh kehadiran Amphistegina, Cibicides, Rotalia, Cavarotalia. Dalam kaitannya dengan kedalaman, sebaran foraminifera cenderung terakumulasi di sebelah timur daerah penelitian. Setiap satuan sedimen dicirikan oleh genus foraminifera tertentu. Kata kunci: foraminifera, distribusi spasial, kedalaman laut, jenis sedimen, Teluk Bone, Sulawesi Selatan A total of twenty five surface sediment samples from the northern part of Bone Bay, South Sulawesi were selected for foraminiferal study. The purpose of this study is to recognize spatial distribution foraminifera in relation with water depth and sediment types. There are 97 identified species, some ot them are dominant at certain sites, such as Amphistegina, Operculina, Heterolepa, Brizalina, Elphidium and Quinqueloculina. Each genus has certain spatial distribution as its habitat with some anomalies. The range of water depth is between 23 and 85 m that characterized by Amphistegina, Cibicides, Rotalia, Cavarotalia. In relation to water depth, the distribution of foraminifera tends to accumulate in the eastern part of the study area. Sediment unit is characterized by certain foraminifera genus. Keywords : Foraminifera, spatial distribution, water depth, sediment type, Bone Bay, South Sulawesi.

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