The response and detoxification strategies of three freshwater phytoplankton species, Aphanizomenon flos-aquae, Pediastrum simplex, and Synedra acus, to cadmium

2015 ◽  
Vol 22 (24) ◽  
pp. 19596-19606 ◽  
Author(s):  
Xiaofei Ran ◽  
Hong Yue ◽  
Xiaoli Fu ◽  
Yuanhao Kang ◽  
Sha Xu ◽  
...  
Keyword(s):  
Phytoplankton Species ◽  
Freshwater Phytoplankton ◽  
Synedra Acus

scholarly journals Automatic Detection of Freshwater Phytoplankton Specimens in Conventional Microscopy Images

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6704
Author(s):  
David Rivas-Villar ◽  
José Rouco ◽  
Manuel G. Penedo ◽  
Rafael Carballeira ◽  
Jorge Novo
Keyword(s):  
Continuous Monitoring ◽  
Phytoplankton Species ◽  
Water Safety ◽  
Fusion Algorithm ◽  
Freshwater Phytoplankton ◽  
Image Objects ◽  
Fully Automatic ◽  
Conventional Microscopy ◽  
Classical Computer ◽  
Microscopy Images

Water safety and quality can be compromised by the proliferation of toxin-producing phytoplankton species, requiring continuous monitoring of water sources. This analysis involves the identification and counting of these species which requires broad experience and knowledge. The automatization of these tasks is highly desirable as it would release the experts from tedious work, eliminate subjective factors, and improve repeatability. Thus, in this preliminary work, we propose to advance towards an automatic methodology for phytoplankton analysis in digital images of water samples acquired using regular microscopes. In particular, we propose a novel and fully automatic method to detect and segment the existent phytoplankton specimens in these images using classical computer vision algorithms. The proposed method is able to correctly detect sparse colonies as single phytoplankton candidates, thanks to a novel fusion algorithm, and is able to differentiate phytoplankton specimens from other image objects in the microscope samples (like minerals, bubbles or detritus) using a machine learning based approach that exploits texture and colour features. Our preliminary experiments demonstrate that the proposed method provides satisfactory and accurate results.

Extracellular phosphatase activity of freshwater phytoplankton exposed to different in situ phosphorus concentrations

2005 ◽  
Vol 56 (4) ◽  
pp. 417 ◽  
Author(s):  
A. Ŝtrojsová ◽  
J. Vrba ◽  
J. Nedoma ◽  
K. Ŝimek
Keyword(s):  
Enzyme Activity ◽  
Phosphatase Activity ◽  
Microcystis Aeruginosa ◽  
Image Cytometry ◽  
Phosphorus Concentration ◽  
Phytoplankton Species ◽  
Freshwater Phytoplankton ◽  
Fragilaria Crotonensis ◽  
Species Specific

Extracellular phosphatase production and biomass change were investigated in phytoplankton species transplanted from the phosphorus-limited dam area of a eutrophic reservoir and exposed to the phosphorus-sufficient inflow part and vice versa. Extracellular phosphatase activity was studied using the enzyme-labelled fluorescence (ELF) technique, allowing for direct microscopic detection of enzyme activity and, moreover, its quantification using image cytometry. Several phytoplankton species (e.g. Anabaena planctonica, Microcystis aeruginosa, Fragilaria crotonensis, Ankyra ancora and Planktosphaeria gelatinosa) regulated phosphatase activity according to external phosphorus concentration. On the contrary, picocyanobacteria and several green algae (Coelastrum microporum, Crucigeniella sp., Pediastrum tetras, and Staurastrum planctonicum) did not produce extracellular phosphatases at all. The species-specific extracellular phosphatase activity of F. crotonensis, A. ancora, and P. gelatinosa ranged between 0.02 and 3.5 fmol μm−2 h−1.

scholarly journals Exploring micropollutant biotransformation in three freshwater phytoplankton species

2017 ◽  
Vol 19 (6) ◽  
pp. 822-832 ◽  
Author(s):  
Michael A. Stravs ◽  
Francesco Pomati ◽  
Juliane Hollender
Keyword(s):  
Transformation Products ◽  
Phytoplankton Species ◽  
Organic Micropollutants ◽  
Freshwater Phytoplankton

Biotransformation was studied for 24 organic micropollutants in three phytoplankton species, revealing 14 transformation products for 10 compounds.

scholarly journals Impacts of pH and salinity on community composition, growth and cell morphology of three freshwater phytoplankton

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
Shaswati Chaktraborty ◽  
Dipalok Karmaker ◽  
Md. Alimur Rahman ◽  
Sukanto Chandra Bali ◽  
Subroto K Das ◽  
...  
Keyword(s):  
Climate Change ◽  
Community Composition ◽  
Cell Morphology ◽  
Single Species ◽  
The Other ◽  
Total Biomass ◽  
Phytoplankton Species ◽  
Freshwater Phytoplankton ◽  
Wide Range ◽  
Impacts Of Climate Change

Impacts of climate change on phytoplankton species are very focusing issues nowadays. This research explored the probable impacts of different pH (pH 5.90 to 9.10) and salinity (0.60 to 3.0 ppt) concentrations on freshwater phytoplankton Chlorella vulgaris, Euglena granulata and Scenedesmus quadricauda. The initial community composition was 4:2:1 for the three taxa, which changed to 6:3:1, 6:2:1, 6:3.5:1 and 9:4:1 in pH 5.90, pH 9.10 and salinity 2.20 and 3.0 ppt respectively. E. granulata showed more tolerance in a wide range of pH (pH 5.90 to 8.30) based on growth rate studies. The other two species showed growth rates reduction gradually in changes with pH and salinity concentrations. Conspicuous changes of total biomass were seen in pH 5.90 and 9.10, and salinity 2.20 and 3.0 ppt conditions. Moreover, significant changes in cell morphology were found in pH 9.10 and 3.0 ppt salinity. The authors concluded that as group, the Chlorophytes were more susceptible than the diatom in these variable pH and salinity conditions, while S. quadricauda was comparatively more vulnerable as a single species.

scholarly journals Absence of negative allelopathic effects of cylindrospermopsin and microcystin-LR on selected marine and freshwater phytoplankton species

Hydrobiologia ◽  
2012 ◽  
Vol 705 (1) ◽  
pp. 27-42 ◽  
Author(s):  
Carlos Pinheiro ◽  
Joana Azevedo ◽  
Alexandre Campos ◽  
Susana Loureiro ◽  
Vítor Vasconcelos
Keyword(s):  
Phytoplankton Species ◽  
Freshwater Phytoplankton ◽  
Allelopathic Effects

A compendium of cell and natural unit biovolumes for >1200 freshwater phytoplankton species

Ecology ◽  
2014 ◽  
Vol 95 (10) ◽  
pp. 2984 ◽  
Author(s):  
Colin T. Kremer ◽  
Jacob P. Gillette ◽  
Lars G. Rudstam ◽  
Pål Brettum ◽  
Robert Ptacnik
Keyword(s):  
Phytoplankton Species ◽  
Natural Unit ◽  
Freshwater Phytoplankton

Competition among freshwater phytoplankton species for ammonium in flow-through cultures

2004 ◽  
Vol 112 ◽  
pp. 157-176
Author(s):  
Hesham M. Shafik ◽  
Sándor Herodek ◽  
Mátyás Présing ◽  
Lajos Vörös
Keyword(s):  
Phytoplankton Species ◽  
Freshwater Phytoplankton ◽  
Flow Through
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