Effects of environmental factors on the seasonally change of phytoplankton populations in a closed freshwater pond

Alam, Muhd Nazrul Hisham Zainal; Jahan, Nusrat; Thalib, Lukman; Wei, Bin; Maekawa, Taira

doi:10.1016/s0160-4120(01)00087-3

Cited by 42 publications

(25 citation statements)

References 24 publications

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“…Szelag-Wasielewska (1999) found that picoplankton were abundant in early spring, nanophytoplankton in late spring, and microphytoplankton in summer in a small Polish shallow lake. Alam et al (2001) also found a positive correlation between the cell size of phytoplankton and temperature in a freshwater pond. In contrast, diatoms did not show significant differences in their size with the time of the year, possibly because they can reproduce both sexually and asexually.…”

Section: Discussionmentioning

confidence: 72%

Seasonal Dynamics of Phytoplankton Assemblages across Nutrient Gradients in Shallow Hypertrophic Lake Manyas, Turkey

Çelik

Ongun

2006

Lake and Reservoir Management

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AbstractÇelik, K. and T. Ongun. 2006. Seasonal dynamics of phytoplankton assemblages across nutrient gradients in shallow hypertrophic Lake Manyas, Turkey. Lake and Reserv. Manage. 22(3):250-260.Species composition, abundance and size distribution (the average measure of the longest cell dimension and surface area to volume ratio) of phytoplankton in the shallow hypertrophic Lake Manyas, Turkey were studied between January 2003 and December 2004. A total of 165 species were recorded during the study. Diatoms and Cyanobacteria were the dominant taxa at most stations. Nitrate and phosphate values showed a decreasing gradient with the distance from Sigirci Inlet to Karadere Outlet. Bacillariophyta dominated the phytoplankton in spring, while Cyanobacteria prevailed in summer. Each summer, a peak of Euglenophyta was also observed at Sigirci Inlet. Nutrient gradients seemed to have a greater control over overall density than of species composition. The size distribution of the Cyanobacteria showed positive correlations with nutrient levels, while green algae and diatoms did not. There was a negative correlation between the average cell dimension of the phytoplankton cells and the surface area to volume ratio in general. The objective of this study was to determine the seasonal dynamics of species composition, abundance and size distribution of phytoplankton assemblages across nutrient gradients along a distance in the shallow hypertrophic Lake Manyas, Turkey.

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Section: Discussionmentioning

confidence: 72%

Seasonal Dynamics of Phytoplankton Assemblages across Nutrient Gradients in Shallow Hypertrophic Lake Manyas, Turkey

Çelik

Ongun

2006

Lake and Reservoir Management

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“…Very scarce observations from natural environments showed that temperature (Alam et al, 2001) and nutrients (Turkia & Lepistö , 1999) can affect the seasonal size variability of organisms inside a particular population.…”

Section: Introductionmentioning

confidence: 99%

Seasonal morphological plasticity of phytoplankton in Lago Maggiore (N. Italy)

et al. 2007

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During the year 2002, the size variability of most of the species found in Lago Maggiore was analysed in detail, measuring through image analysis the main morphological parameters (maximum linear dimension, surface, volume) of the algal cells. Many individuals belonging to the same species were measured sampling by sampling, collecting about 28,000 data. This data set allowed us to evaluate the morphological plasticity of many species across the seasonal succession: through multivariate statistical analysis we compared the changes of cell volume, cell surface, maximum linear dimension and surface-to-volume ratio to the fluctuations of the main physical and chemical parameters. The responses we observed were variable, depending on the different taxonomic groups or species as well as on the morphometric parameter considered. As a general pattern, a strong seasonality of the size changes was observed, mainly dependent on the gradients of nutrients and temperature.

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“…The function of proteolytic psychrophiles such as F. limicola to aerobically decompose and mineralize PON play an ecologically important role in the sediment of shallow eutrophic lakes such as Lake Kasumigaura for the following reasons: (i) temperatures in freshwater sediments are 4-18°C, which are appropriate for the metabolic activity of psychrophiles, during the autumn-winter-spring seasons, three fourths of the year 2,27) ; (ii) a few centimeters of the sediment is kept relatively oxic during these seasons 1,9) ; (iii) the POM content of sediments frequently increases in early autumn due to sedimentation of POM derived from a number of blue-green-algae that grow during the summer 1) ; (iv) the most common form of PON found in sediment is proteinaceous compounds such as polymerized amino acids or peptides 8,11,[16][17][18] .…”

Section: Resultsmentioning

confidence: 99%

The Ecological Role of a Proteolytic Psychrophile, Flavobacterium limicola Belonging to the Cytophaga-Flavobacteria Cluster, in the Decomposition of Particulate Organic Nitrogen in Freshwater Sediment

et al. 2004

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Microbes of the Cytophaga-Flavobacterium (CF) group, within the phylum Bacteroidetes, have been considered contributors to the early decomposition of particulate organic matter (POM) in sediments because of their abundance in the ecosystem and their great ability to degrade macromolecules on artificial media. However, there is no report on the ability of members of this group to decompose POM in sediment. We investigated the POM-decomposition capabilities of members of the CF group, Flavobacterium limicola strains ST-82 T , ST-10 and ST-92 isolated from freshwater sediment as proteolytic psychrophiles, in sterilized sediment slurries. All strains of F. limicola grew and survived at over 10 8 cfu per ml for more than 30 days in the sediment slurries at 5°C. Protease activity levels in the slurries inoculated with the strains were 3-5 times higher than the control level for over 30 days of incubation at 5°C. Concentrations of total dissolved nitrogen (TDN) released by the hydrolysis of particulate organic nitrogen (PON), significantly increased only in the slurries inoculated with F. limicola strains. Approximately 70-80% of the TDN released was converted to NH 4 + -N in these inoculated slurries. The results clearly demonstrate that F. limicola strains ST-82 T , ST-10 and ST-92 are able to secrete an extracellular protease and hydrolyze PON to TDN and thereby mineralize TDN to NH4 + -N in freshwater sediment. This is the first report on the decomposition and mineralization of PON by members of the CF group in benthic environments.

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Effects of environmental factors on the seasonally change of phytoplankton populations in a closed freshwater pond

Cited by 42 publications

References 24 publications

Seasonal Dynamics of Phytoplankton Assemblages across Nutrient Gradients in Shallow Hypertrophic Lake Manyas, Turkey

Seasonal Dynamics of Phytoplankton Assemblages across Nutrient Gradients in Shallow Hypertrophic Lake Manyas, Turkey

Seasonal morphological plasticity of phytoplankton in Lago Maggiore (N. Italy)

The Ecological Role of a Proteolytic Psychrophile, Flavobacterium limicola Belonging to the Cytophaga-Flavobacteria Cluster, in the Decomposition of Particulate Organic Nitrogen in Freshwater Sediment

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