Characteristics of Benthic Chlorophyll a and Sediment Properties in the Tidal Flats of Kwangyang Bay, Korea

ALGAE ◽  
2009 ◽  
Vol 24 (3) ◽  
pp. 149-161 ◽  
Author(s):  
Yong-Sik Sin ◽  
Sang-Ock Ryu ◽  
Eun-Sook Song
Keyword(s):  
Chlorophyll A ◽  
Tidal Flats ◽  
Sediment Properties ◽  
Benthic Chlorophyll A

A basis for mapping the erodibility of tidal flats by optical remote sensing

1998 ◽  
Vol 49 (8) ◽  
pp. 867 ◽  
Author(s):  
J. H. M. Hakvoort ◽  
M. Heineke ◽  
K. Heymann ◽  
H. Kühl ◽  
R. Riethmüller ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Shear Stress ◽  
Chlorophyll A ◽  
Fine Particles ◽  
Tidal Flats ◽  
Benthic Diatom ◽  
Reflectance Spectra ◽  
Sediment Type ◽  
Optical Remote Sensing ◽  
Chlorophyll A Concentration

A means of monitoring surface sediment stability of tidal flats with optical remote sensing has been developed. Erosion shear stress and corresponding bio-geo-chemical parameters of tidal flats were measured over five years in the Sylt/Rømø Bight, Germany. Ground-based optical reflectance spectra were measured during one year. A significant dependence of erosion shear stress on the benthic diatom chlorophyll a concentration in the uppermost 1-mm layer was found for muddy areas but decreased with decreasing proportion of fine particles (< 63 µm). With a low phytobenthic coverage there was a weak dependence of erosion shear stress on the proportion of fine particles. There were two main classes of the reflectance spectra: containing information on sediment type i.e. proportion of fine particles, and containing information on benthic diatoms and other phytobenthic species. There was a significant correlation between the reflectance spectra and proportion of fine particles and also between reflectance spectra and benthic diatom chlorophyll α concentration. Hence, the erodibility of tidal flats can be mapped by optical remote sensing when benthic chlorophyll a concentration and proportion of fine particles are used for estimation of the erosion shear stress.

scholarly journals Shallow sublittoral benthic communities of the Laguna Estuarine System, South Brazil

2006 ◽  
Vol 54 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Gustavo Fonseca ◽  
Sérgio A. Netto
Keyword(s):  
Species Richness ◽  
Chlorophyll A ◽  
Temporal Variability ◽  
Benthic Communities ◽  
Nematode Species ◽  
Estuarine System ◽  
Life Strategies ◽  
Sediment Properties ◽  
Higher Taxa ◽  
South Brazil

Sediment properties, microphytobenthos biomass (chlorophyll a and phaeopigments), and the structure of the benthic communities of the three main lagoons (Mirim, Imaruí and Santo Antonio) of the Laguna Estuarine System, South Brazil, were analyzed during summer and winter. Microphytobenthos biomass did not differ significantly among the lagoons, but showed higher values in the summer. The macrofauna was characterized by low species richness and the dominance of the gastropod Heleobia australis, the tanaidean Kalliapseudes schubartti and the bivalve Erodona mactroides. The meiofauna was composed of 20 higher taxa and the nematodes dominated in all the lagoons and periods. Desmodora (Desmodora) sp.1, Terschllingia sp. and Microlaimus sp. were numerically the most important among the 74 nematode species registered. This study showed that, in the Laguna Estuarine System, differences in the benthos among lagoons and periods were dependent on the fauna component analyzed. Whilst macrofauna and nematodes were significantly more diverse in the inner stations, in the Mirim Lagoon, the number of meiofauna taxa did not differ significantly among the lagoons and the diversity and evenness were highest in Santo Antonio. These results were a response of the fauna to the salinity oscillations coupled with the heterogeneity of the sediment in the lagoons. The temporal variability of the fauna, macrofauna being more abundant in the summer and meiofauna in the winter, could be related to the different life strategies of these groups.

The influence of channel bed disturbance on benthic Chlorophyll a: A high resolution perspective

Geomorphology ◽  
2018 ◽  
Vol 305 ◽  
pp. 141-153 ◽  
Author(s):  
Scott B. Katz ◽  
Catalina Segura ◽  
Dana R. Warren
Keyword(s):  
High Resolution ◽  
Chlorophyll A ◽  
Benthic Chlorophyll A

Density-dependent effects of bioturbation by the clam, Scrobicularia plana, on the erodibility of estuarine sediments

2009 ◽  
Vol 60 (7) ◽  
pp. 737 ◽  
Author(s):  
Claudia Soares ◽  
Paula Sobral
Keyword(s):  
Water Column ◽  
Chlorophyll A ◽  
Extracellular Polymeric Substance ◽  
Feeding Behaviour ◽  
Estuarine Sediments ◽  
Tagus Estuary ◽  
Benthic Organisms ◽  
Sediment Properties ◽  
Density Dependent ◽  
Scrobicularia Plana

Benthic organisms are known to modify sediment properties and influence the flux of materials to the water column. In this study, the density-dependent effects of bioturbation by the estuarine clam, Scrobicularia plana, on the biogeochemical properties and erodibility of the sediment were assessed using laboratory annular flumes. Sediments with different mud contents (~98% and 90%) were collected undisturbed from two different sites of the Tagus estuary. S. plana were added to the sediment at increasing densities (0, 57, 115 and 229 ind m–2) and left to bioturbate the sediment before the experimental erosion runs. All erosion runs were carried out following a stepwise increase of current velocities (U) up to 0.25 m s–1. Sediment chlorophyll a, pheopigments and extracellular polymeric substance fractions were measured at the time of sampling in the field and in the end of the erosion runs. Increasing densities of S. plana in the muddier sediment raised eroded mass, while the sediment with less mud behaved as non-cohesive and registered a decrease in eroded mass possibly due to a switch in the feeding behaviour of S. plana.

scholarly journals Microphytobenthic biomass on a subtropical intertidal flat of Paranaguá bay (Southern Brazil): spatio-temporal distribution and the influence of environmental conditions

2013 ◽  
Vol 61 (2) ◽  
pp. 83-92 ◽  
Author(s):  
Alessandra Larissa D'Oliveira Fonseca ◽  
Eunice da Costa Machado ◽  
Frederico Pereira Brandini ◽  
Nilva Brandini
Keyword(s):  
Chlorophyll A ◽  
Inorganic Nitrogen ◽  
Spatial Dynamics ◽  
Temporal Distribution ◽  
Nutrient Concentrations ◽  
Spatial Gradient ◽  
Intertidal Flat ◽  
Sediment Properties ◽  
Intertidal Sand Flat ◽  
Spatio Temporal

Seasonal and spatial dynamics of the microphytobenthic biomass on a subtropical intertidal sand flat (25°32'S; 48°24'W) was investigated monthly from September 1995 to July 1996. Chlorophyll-a and Phaeophytin-a contents, temperature, salinity, inorganic nitrogen and phosphate pore water concentrations and sediment characteristics were assessed in the upper (HW), middle (MW) and lower (LW) sections of the flat. Microphytobenthic biomass content showed a conspicuous seasonal and spatial gradient. Higher chlorophyll-a contents were registered in the HW section of the tidal flat (from 11.78 µg.gsed-1 to 38.18 µg.gsed-1) decreasing towards the LW section (from 6.23 µg.gsed-1 to 18.23 µg.gsed-1). Microphytobenthic seasonality was determined mainly by turbulence of the water column, which was influenced by atmospheric events. The sediment properties and nutrient concentrations had a significant effect on the spatial and seasonal distribution of pigments on the intertidal flat.

High-Resolution electron crystallography of the light-harvesting chlorophyll-a/b protein complex from chloroplast membranes

1990 ◽  
Vol 48 (1) ◽  
pp. 610-610
Author(s):  
Werner Kühlbrandt ◽  
Da Neng Wang ◽  
K.H. Downing
Keyword(s):  
High Resolution ◽  
Electron Diffraction ◽  
Chlorophyll A ◽  
Protein Complex ◽  
Structural Integrity ◽  
Light Harvesting ◽  
Lhc Ii ◽  
Diffraction Patterns ◽  
Difference Fourier ◽  
2D Crystals

The light-harvesting chlorophyll-a/b protein complex (LHC-II) is the most abundant membrane protein in the chloroplasts of green plants where it functions as a molecular antenna of solar energy for photosynthesis. We have grown two-dimensional (2d) crystals of the purified, detergent-solubilized LHC-II . The crystals which measured 5 to 10 μm in diameter were stabilized for electron microscopy by washing with a 0.5% solution of tannin. Electron diffraction patterns of untilted 2d crystals cooled to 130 K showed sharp spots to 3.1 Å resolution. Spot-scan images of 2d crystals were recorded at 160 K with the Berkeley microscope . Images of untilted crystals were processed, using the unbending procedure by Henderson et al . A projection map of the complex at 3.7Å resolution was generated from electron diffraction amplitudes and high-resolution phases obtained by image processing .A difference Fourier analysis with the same image phases and electron diffraction amplitudes recorded of frozen, hydrated specimens showed no significant differences in the 3.7Å projection map. Our tannin treatment therefore does not affect the structural integrity of the complex.

Identification of a single-copy gene encoding a Type I chlorophyll a/b-binding polypeptide of photosystem I in Arabidopsis thaliana

1992 ◽  
Vol 84 (4) ◽  
pp. 561-567 ◽  
Author(s):  
Poul E. Jensen ◽  
Michael Kristensen ◽  
Tine Hoff ◽  
Jan Lehmbeck ◽  
Bjarne M. Stummann ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Chlorophyll A ◽  
Photosystem I ◽  
Single Copy ◽  
Type I ◽  
Single Copy Gene ◽  
Gene Encoding ◽  
Copy Gene
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