Phytoplankton compositions in Alaaras torist Island  Lake – Iraq

Baghdad Science Journal

doi:10.21123/bsj.10.1.13-21

Phytoplankton compositions in Alaaras torist Island Lake – Iraq

Baghdad Science Journal ◽

10.21123/bsj.10.1.13-21 ◽

2013 ◽

Vol 10 (1) ◽

pp. 13-21

Author(s):

Baghdad Science Journal

Keyword(s):

Seasonal Variation ◽

Green Algae ◽

Blue Green Algae

The study includes the phytoplankton compositions in Alaaras Lake , in summer 2008 and winter , spring , summer 2009. Samples were collected from three selected sites at north , middle and south of lake. A total of 74 taxa of phytoplankton were identified . The diatoms were the dominated by 44 taxa represented 82.8% of the total indentified species, followed by green algae ( Chlorophyta ) of 20 taxa (8.5%), and blue green algae (Cyanophyta of 7 taxa (7.2%). Tow species were recorded of Pyrrophyta and one species of Euglenophyta .The seasonal variation for Diatoms density showed tow peaks during Autumn and summer. Few species were dominated during the most studied period such as Cocconeis placentula var. euglypta, Synedra fasciculata and Cymbell affinis .

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Epipelic Algae in Hemren Reservoir , Iraq

Baghdad Science Journal ◽

10.21123/bsj.4.2.208-214 ◽

2007 ◽

Vol 4 (2) ◽

pp. 208-214

Author(s):

Baghdad Science Journal

Keyword(s):

Seasonal Variation ◽

Cell Density ◽

Green Algae ◽

Blue Green Algae ◽

Nitzschia Palea ◽

Two Peaks ◽

Achnanthes Minutissima

The study includes the epipelic algae in Hemren reservoir, for the period between Januarys to October 2000 .The samples were collected from three selected sites at north, middle and south of reservoir. A total of 96 taxa of epipelic algae were identified. The diatoms were the dominated by 82 taxa represented 85.4% of the total identified species, followed by blue-green algae (cyanophyta) of 6.3 taxa (6%), and then green algae (chlorophyta) of 5.2 taxa (5%). One species was recorded for each crysophyta, euglenophyta and pyrrophyta. The seasonal variation for the cell density showed two peaks during spring and autumn seasons. Few species were dominated during the most studied period such as Achnanthes minutissima, Navicula cryptocephala, N. cryptocephala var . veneta and Nitzschia palea .

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SEASONAL VARIATION OF FRESH WATER BLUE GREEN ALGAE IN GOSSAIGAON SUBDIVISION UNDER KOKRAJHAR DISTRICT

Journal of Global Resources ◽

10.46587/jgr.2021.v07i02.015 ◽

2021 ◽

Vol 7 (2) ◽

pp. 148

Author(s):

Runuma Rabha Basumatary ◽

Mautushi Das

Keyword(s):

Seasonal Variation ◽

Fresh Water ◽

Green Algae ◽

Blue Green Algae

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Dinoflagellates in the Australian Region.

Marine and Freshwater Research ◽

10.1071/mf9540171 ◽

1954 ◽

Vol 5 (2) ◽

pp. 171 ◽

Cited By ~ 97

Author(s):

EJF Wood

Keyword(s):

Seasonal Variation ◽

Green Algae ◽

West Coast ◽

Species Concept ◽

Warm Water ◽

Single Factor ◽

The West ◽

Blue Green Algae ◽

Number Of Species ◽

Sexual Process

In this paper, the taxonomy of the dinoflagellates found in Australian waters is given, and the species concept as applied to the group is discussed. It is suggested that the Linnaean species concept cannot be strictly applied to a group which has, as a whole, no known sexual process and of which the vast majority of forms has not been cultivated. The seasonal variation and fluctuations of dinoflagellates in Australian waters are considered. It is found that, as usual, the greatest number of species occurs in warmer waters. Dinoflagellates are regarded as excellent indicators of water masses, and in one example, i.e. west of Tasmania, subtropical dinoflagellates led to the postulation of a subtropical current flowing east from Cape Leeuwin to King I. This has recently been confirmed by the finding of warm-water turtles on the west coast of Tasmania. Dinoflagellates are not as important as diatoms or tropical blue-green algae in productivity, except on rare occasions, but do serve as food for certain groups, e.g. salps, tintinnids, etc. Some are halophytic, some holozoic, and some facultative. No single factor or set of factors can be adduced to explain dinoflagellate maxima. There is some evidence of a rhythm, which may be tidal, in Goniaulas digitale and also in G. catenella.

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Freeze-Fracture Replication in the Ultrastructure of Blue-Green Algae

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100060386 ◽

1967 ◽

Vol 25 ◽

pp. 74-75

Author(s):

L. V. Leak

Keyword(s):

Cell Wall ◽

Electron Microscope ◽

Green Algae ◽

Three Dimensional ◽

Freeze Fracture ◽

Electron Microscopic ◽

Photosynthetic Membranes ◽

Blue Green Algae ◽

Cell Biol ◽

Cellular Components

Electron microscopic observations of freeze-fracture replicas of Anabaena cells obtained by the procedures described by Bullivant and Ames (J. Cell Biol., 1966) indicate that the frozen cells are fractured in many different planes. This fracturing or cleaving along various planes allows one to gain a three dimensional relation of the cellular components as a result of such a manipulation. When replicas that are obtained by the freeze-fracture method are observed in the electron microscope, cross fractures of the cell wall and membranes that comprise the photosynthetic lamellae are apparent as demonstrated in Figures 1 & 2.A large portion of the Anabaena cell is composed of undulating layers of cytoplasm that are bounded by unit membranes that comprise the photosynthetic membranes. The adjoining layers of cytoplasm are closely apposed to each other to form the photosynthetic lamellae. Occassionally the adjacent layers of cytoplasm are separated by an interspace that may vary in widths of up to several 100 mu to form intralamellar vesicles.

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