Some Aspects of the Ecology of Lake Macquarie, N.S.W., with Regard to an Alleged Depletion of Fish. VI. Plant Communities and their Significance

1959 ◽  
Vol 10 (3) ◽  
pp. 322 ◽  
Author(s):  
EJF Wood
Keyword(s):  
Green Algae ◽  
Plant Communities ◽  
Brown Algae ◽  
Phytoplankton Community ◽  
Bottom Community ◽  
Blue Green Algae ◽  
Reef Community ◽  
Photosynthetic Organisms ◽  
Sea Grass

There are four plant communities in Lake Macquarie: the see-grass community, the reef community, the mud bottom community, and the phytoplankton community. Biologically, the sea-grass community is regarded as being the most important. The epiphytes on the sea-grasses are largely used as food by phytophagous fish and other animals. The reef community consists of larger brown algae which are not of themselves of great importance, and of felts of blue-green algae such as Ectocarpus, and other filamentous forms which are important. Photosynthetic organisms are sparse in the mud bottoms, except for the tapetic organisms in the sea. Phytoplankton is relatively abundant.

scholarly journals DELAYED LIGHT ACTION SPECTRA OF SEVERAL ALGAE IN VISIBLE AND ULTRAVIOLET LIGHT

1958 ◽  
Vol 42 (2) ◽  
pp. 243-250 ◽  
Author(s):  
G. C. McLeod
Keyword(s):  
Green Algae ◽  
Red Algae ◽  
Brown Algae ◽  
Light Emission ◽  
Incident Light ◽  
Ultraviolet Region ◽  
Blue Green Algae ◽  
Action Spectra ◽  
Light Production ◽  
Carotenoid Absorption

Action spectra for delayed light production by several algae were determined from 250 to 750 mµ incident light. In the visible portion of the spectrum the action spectra resemble those reported by previous workers for photosynthesis and light emission. Blue-green algae had a maximum at 620 mµ, red algae at 550 mµ, whereas green and brown algae have action spectra corresponding to chlorophyll and carotenoid absorption. In the ultraviolet portion of the spectrum delayed light is emitted by algae down to 250 mµ incident light. The action spectra of the different algae are not alike in the ultraviolet portion of the spectrum. This indicates that pigments other than chlorophyll must be sensitizing or shielding the algae in the ultraviolet region.

scholarly journals The synthesis of acetylcholine by plants

1981 ◽  
Vol 194 (1) ◽  
pp. 361-364 ◽  
Author(s):  
B N Smallman ◽  
A Maneckjee
Keyword(s):  
Pisum Sativum ◽  
Green Algae ◽  
Choline Acetyltransferase ◽  
Spinacia Oleracea ◽  
Higher Plants ◽  
Urtica Dioica ◽  
The Other ◽  
Affinity Column ◽  
Blue Green Algae ◽  
Photosynthetic Organisms

Choline acetyltransferase was demonstrated in nettles (Urtica dioica), peas (Pisum sativum), spinach (Spinacia oleracea), sunflower (Helianthus annuus) and blue–green algae by using a Sepharose–CoASH affinity column. The column effected a 1500-fold purification of the enzyme from nettle homogenates and was required for demonstrating activity in the other higher plants. Demonstration of the enzyme in blue-green algae suggests that acetylcholine was a biochemical necessity in the earliest photosynthetic organisms.

scholarly journals DIVERSITY AND COMMUNITY STRUCTURE OF MACROALGAE AT KOH TAEN, HAAD KHANOM-MU KOH TALE TAI, MARINE NATIONAL PARK, NAKHON SI THAMMARAT PROVINCE, THAILAND

1970 ◽  
Vol 32 (2) ◽  
pp. 153-162
Author(s):  
Anchana Prathep ◽  
Anuchit Darakrai ◽  
Piyalap Tantiprapas ◽  
Jaruwan Mayakun ◽  
Pimonrat Thongroy ◽  
...  
Keyword(s):  
Community Structure ◽  
Green Algae ◽  
Red Algae ◽  
Brown Algae ◽  
National Park ◽  
Preliminary Survey ◽  
Blue Green Algae ◽  
Quadrat Sampling

The diversity and community structure of macroalgae at Koh Taen, Haad Khanom-Mu Koh Tale Tai, marine National Park, Nakhon Si Thammarat Province, Thailand were investigated from 1st- 5th October 2005 (preliminary survey). Out of a total of 41 species: 15 species each of green and red algae, 9 species of brown algae and 2 species of blue green algae were found. In the area, subsequently four sites were established for monitoring. Quadrat sampling was employed to assess the abundance of macroalgae. In total sixty quadrats were monitored each month from October 2005 to April 2007. We report the variations of diversity and abundance of macroalgae among sites and seasons and speculate about what might cause such variations.

scholarly journals Capillary Electrophoresis Single-Strand Conformational Polymorphisms as a Method to Differentiate Algal Species

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Alice Jernigan ◽  
Christa Hestekin
Keyword(s):  
Capillary Electrophoresis ◽  
Green Algae ◽  
Brown Algae ◽  
Algal Species ◽  
Single Strand ◽  
Nostoc Muscorum ◽  
Single Strand Conformational Polymorphism ◽  
Variable Regions ◽  
Blue Green Algae ◽  
Potential Shifts

Capillary electrophoresis single-strand conformational polymorphism (CE-SSCP) was explored as a fast and inexpensive method to differentiate both prokaryotic (blue-green) and eukaryotic (green and brown) algae. A selection of two blue-green algae (Nostoc muscorumandAnabaena inaequalis), five green algae (Chlorella vulgaris, Oedogonium foveolatum, Mougeotiasp.,Scenedesmus quadricauda, andUlothrix fimbriata), and one brown algae (Ectocarpussp.) were examined and CE-SSCP electropherogram “fingerprints” were compared to each other for two variable regions of either the 16S or 18S rDNA gene. The electropherogram patterns were remarkably stable and consistent for each particular species. The patterns were unique to each species, although some common features were observed between the different types of algae. CE-SSCP could be a useful method for monitoring changes in an algae species over time as potential shifts in species occurred.

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

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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