Meiobenthos of hypersaline tropical mangrove sediment in relation to spring tide inundation

2000 ◽  
pp. 57-64
Author(s):  
Emil Ólafsson ◽  
Susanna Carlström ◽  
Simon G. M. Ndaro
Keyword(s):  
Spring Tide ◽  
Mangrove Sediment

Spring Tide in the Money Market

1966 ◽  
Vol 22 (5) ◽  
pp. 101-102
Author(s):  
Sidney Homer
Keyword(s):  
Spring Tide ◽  
Money Market

KAJIAN POLA TANAM PADA LAHAN GAMBUT KECAMATAN SUNGAI RAYA KABUPATEN KUBU RAYA

2012 ◽  
Vol 12 (2) ◽  
Author(s):  
Karnadi .
Keyword(s):  
Spring Tide

AbstrakDaerah Desa Limbung merupakan salah satudaerah rawa yang dipengaruhi oleh pasang surut yang terletak di KecamatanSungai Raya Kabupaten Kubu Raya yang saat ini sebagian besar belum dikembangkandan dimanfaatkan menjadi lahan pertanian. Hal ini menyebabkan masih rendahnyapendapatan penduduk dalam memproduksi hasil pertaniannya. Untuk itu, setelahdilakukan perbaikan dalam hal pola tanam, yakni dalam pemilihan jenis tanamandan jadwal penanaman yang tepat diharapkan dapat meningkatkan produksi hasilpertanian dan meningkatkan kesejahteraan hidup para petani Kecamatan SungaiRaya Kabupaten Kubu Raya, khususnya untuk Desa Limbung. Dalam penelitian ini,untuk menganalisi permasalahan yang ada diperlukan data primer dan datasekunder. Data primer meliputi data pergerakan pasang surut di lapangan selama27 jam dan data pola tanam yang biasa dilakukan oleh petani Desa Limbung. Untukdata sekunder meliputi data hidrologi dan klimatologi serta data pergerakanpasang surut. Analisis yang akan dilakukan meliputi analisis hidrometri, analisishidrologi, analisis pola tanam dan analisis pengelolaan air. Hasil akhirdidapat bahwa untuk daerah Desa Limbung masih dipengaruhi adanya pasang surutair laut dengan ketinggian spring tide 181,00 cm dan neap tide51,00 cm. Dari analisis kebutuhan air tanaman dengan beberapa alternatif polatanam, didapat pola tanam yang paling baik dengan kebutuhan air tanaman per haripaling terkecil adalah pola tanam Jagung Jagung Jagung dengan kebutuhan airsebesar 4,37 mm/hari dan pola tanam Padi Padi Padi dengan kebutuhan airsebesar 4,58 mm/hari. Berdasarkan zona pengelolaan air yang ada di daerah DesaLimbung dapat dibedakan dua zona pengelolaan air yaitu ZPA I (tanamanperkebunan) dan ZPA VIII (tanaman padi tadah hujan). Sumber air untuk memenuhikebutuhan air tanaman berasal dari saluran tersier yang terdapat di arealpertanian.Kata-kata kunci: pasangsurut, pola tanam, kebutuhan air tanaman

Bacterial communities reflect the spatial variation in pollutant levels in Brazilian mangrove sediment

2010 ◽  
Vol 99 (2) ◽  
pp. 341-354 ◽  
Author(s):  
R. Peixoto ◽  
G. M. Chaer ◽  
F. L. Carmo ◽  
F. V. Araújo ◽  
J. E. Paes ◽  
...  
Keyword(s):  
Spatial Variation ◽  
Bacterial Communities ◽  
Mangrove Sediment

scholarly journals The Response of Turbidity Maximum to Peak River Discharge in a Macrotidal Estuary

Water ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 106
Author(s):  
Yuhan Yan ◽  
Dehai Song ◽  
Xianwen Bao ◽  
Nan Wang
Keyword(s):  
River Discharge ◽  
Recovery Time ◽  
Morphological Evolution ◽  
Spring Tide ◽  
River Estuary ◽  
Sediment Concentration ◽  
Ocean Model ◽  
Turbidity Maximum ◽  
Sediment Supply ◽  
Three Dimensional Model

The Ou River, a medium-sized river in the southeastern China, is examined to study the estuarine turbidity maximum (ETM) response to rapidly varied river discharge, i.e., peak river discharge (PRD). This study analyzes the difference in ETM and sediment transport mechanisms between low-discharge and PRD during neap and spring tides by using the Finite-Volume Community Ocean Model. The three-dimensional model is validated by in-situ measurements from 23 April to 22 May 2007. In the Ou River Estuary (ORE), ETM is generally induced by the convergence between river runoff and density-driven flow. The position of ETM for neap and spring tides is similar, but the suspended sediment concentration during spring tide is stronger than that during neap tide. The sediment source of ETM is mainly derived from the resuspension of the seabed. PRD, compared with low-discharge, can dilute the ETM, but cause more sediment to be resuspended from the seabed. The ETM is more seaward during PRD. After PRD, the larger the peak discharge, the longer the recovery time will be. Moreover, the river sediment supply helps shorten ETM recovery time. Mechanisms for this ETM during a PRD can contribute to studies of morphological evolution and pollutant flushing.

scholarly journals Isolation and properties of ammonia-oxidizing bacteria from mangrove sediment, hanura lampung beach

2021 ◽  
Vol 1751 ◽  
pp. 012054
Author(s):  
R Putri ◽  
Sumardi ◽  
B Irawan ◽  
R Agustrina ◽  
Tugiyono
Keyword(s):  
Mangrove Sediment ◽  
Ammonia Oxidizing Bacteria

scholarly journals Tidal variability of nutrients in a coastal coral reef system influenced by groundwater

2018 ◽  
Vol 15 (4) ◽  
pp. 997-1009 ◽  
Author(s):  
Guizhi Wang ◽  
Shuling Wang ◽  
Zhangyong Wang ◽  
Wenping Jing ◽  
Yi Xu ◽  
...  
Keyword(s):  
Coral Reef ◽  
Water Column ◽  
Water Depth ◽  
Neap Tide ◽  
Groundwater Discharge ◽  
Spring Tide ◽  
Biological Processes ◽  
Reef System ◽  
Nitrite Nitrate ◽  
Coral Reef System

Abstract. To investigate variation in nitrite, nitrate, phosphate, and silicate in a spring–neap tide in a coral reef system influenced by groundwater discharge, we carried out a time-series observation of these nutrients and 228Ra, a tracer of groundwater discharge, in the Luhuitou fringing reef at Sanya Bay in the South China Sea. The maximum 228Ra, 45.3 dpm 100 L−1, appeared at low tide and the minimum, 14.0 dpm 100 L−1, appeared during a flood tide in the spring tide. The activity of 228Ra was significantly correlated with water depth and salinity in the spring–neap tide, reflecting the tidal-pumping feature of groundwater discharge. Concentrations of all nutrients exhibited strong diurnal variation, with a maximum in the amplitude of the diel change for nitrite, nitrate, phosphate, and silicate in the spring tide of 0.46, 1.54, 0.12, and 2.68 µM, respectively. Nitrate and phosphate were negatively correlated with water depth during the spring tide but showed no correlation during the neap tide. Nitrite was positively correlated with water depth in the spring and neap tide due to mixing of nitrite-depleted groundwater and nitrite-rich offshore seawater. They were also significantly correlated with salinity (R2  ≥  0.9 and P < 0.05) at the ebb flow of the spring tide, negative for nitrate and phosphate and positive for nitrite, indicating the mixing of nitrite-depleted, nitrate- and phosphate-rich less saline groundwater and nitrite-rich, nitrate- and phosphate-depleted saline offshore seawater. We quantified variation in oxidized nitrogen (NOx) and phosphate contributed by biological processes based on deviations from mixing lines of these nutrients. During both the spring and neap tide biologically contributed NOx and phosphate were significantly correlated with regression slopes of 4.60 (R2  =  0.16) in the spring tide and 13.4 (R2  =  0.75) in the neap tide, similar to the composition of these nutrients in the water column, 5.43 (R2  =  0.27) and 14.2 (R2  =  0.76), respectively. This similarity indicates that the composition of nutrients in the water column of the reef system was closely related with biological processes during both tidal periods, but the biological influence appeared to be less dominant, as inferred from the less significant correlations (R2  =  0.16) during the spring tide when groundwater discharge was more prominent. Thus, the variability of nutrients in the coral reef system was regulated mainly by biological uptake and release in a spring–neap tide and impacted by mixing of tidally driven groundwater and offshore seawater during spring tide.

Kinetics of n-butyl benzyl phthalate degradation by a pure bacterial culture from the mangrove sediment

2007 ◽  
Vol 140 (1-2) ◽  
pp. 194-199 ◽  
Author(s):  
Xiang-Rong Xu ◽  
Hua-Bin Li ◽  
Ji-Dong Gu ◽  
Xiao-Yan Li
Keyword(s):  
Bacterial Culture ◽  
Mangrove Sediment ◽  
Butyl Benzyl Phthalate ◽  
Pure Bacterial Culture ◽  
Kinetics Of

scholarly journals Cytotoxic Minor Piericidin Derivatives from the Actinomycete Strain Streptomyces psammoticus SCSIO NS126

Marine Drugs ◽  
2021 ◽  
Vol 19 (8) ◽  
pp. 428
Author(s):  
Kunlong Li ◽  
Ziqi Su ◽  
Yongli Gao ◽  
Xiuping Lin ◽  
Xiaoyan Pang ◽  
...  
Keyword(s):  
Renal Cell Carcinoma ◽  
Structural Diversity ◽  
Mangrove Sediment ◽  
Cytotoxic Activities ◽  
Spectroscopic Methods ◽  
Biosynthetic Pathways ◽  
Fermentation Conditions ◽  
Lead Compounds ◽  
Ic50 Values ◽  
Actinomycete Strain

The mangrove-sediment-derived actinomycete strain Streptomyces psammoticus SCSIO NS126 was found to have productive piericidin metabolites featuring anti-renal cell carcinoma activities. In this study, in order to explore more diverse piericidin derivatives, and therefore to discover superior anti-tumor lead compounds, the NS126 strain was further fermented at a 300-L scale under optimized fermentation conditions. As a result, eight new minor piericidin derivatives (piericidins L-R (1–7) and 11-demethyl-glucopiericidin A (8)) were obtained, along with glucopiericidin B (9). The new structures including absolute configurations were determined by spectroscopic methods coupled with experimental and calculated electronic circular dichroism. We also proposed plausible biosynthetic pathways for these unusual post-modified piericidins. Compounds 1 and 6 showed selective cytotoxic activities against OS-RC-2 cells, and 2–5 exhibited potent cytotoxicity against HL-60 cells, with IC50 values lower than 0.1 μM. The new piericidin glycoside 8 was cytotoxic against ACHN, HL-60 and K562, with IC50 values of 2.3, 1.3 and 5.5 μM, respectively. The ability to arrest the cell cycle and cell apoptosis effects induced by 1 and 6 in OS-RC-2 cells, 2 in HL-60 cells, and 8 in ACHN cells were then further investigated. This study enriched the structural diversity of piericidin derivatives and confirmed that piericidins deserve further investigations as promising anti-tumor agents.

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