Seaweeds Net of Taiwan-flash menu

::: What are seaweeds? Morphology and Taxonomy Reproduction & Life cycles Ecology and distribution Importance and Economic uses Seaweed resources of Taiwan Seaweeds of northeastern Taiwan Search of species of Taiwan seaweeds sitmap Educational activity Game Extension learning Wallpaper
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icon Introduction
icon Morphology
  photo Appearance
photo Branching
photo Growth
photo Cell Structure
photo Plastid or Chloroplast
photo Holdfast
photo Asexual Reproduction
photo Sexual Reproduction
icon Taxonomy
  photo Chlorophyta
photo Phaeophyta
photo Rhodophyta
photo Cyanophyta
   
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taxonomy
Search of species of Taiwan seaweeds sitemap Educational activity Game Extension learning Wallpaper
iconCyanophyta
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Cyanophyta  Among all algae, Cyanophyta (blue-green algae) are the most primitive and the simplest. They have neither cell nucleus nor other organelle. Their chromosomes and pigments are dispersed in the cytoplasm, so they are considered “prokaryote”.

   Most blue-green algae appear to be greenish blue because they contain chlorophyll and phycocyanin. They also contain phycoerythrin, so they may appear red, yellow, green, brown or black depending on the maturity, physical condition and surrounding light. Comparing to other organisms, blue-green algae more effectively use the light to adapt to their surrounding environments. On the surface of the blue-algae, one will usually find a sticky layer of sheath, which serves to protect them in unfavorable conditions. Such threats help blue-green algae to survive in high temperature, extremely low temperature, lack of oxygen, lack of water and high salinity.

Cyanophyta   Blue algae do not have sexual reproduction and they multiply by fragmentation or binary cell divisions. Some in filamentous forms use hollow dead cells which divide into several fragments to multiply. Some will generate heterocyst or akinete, which is a type of autospore that can store nutrients or sprout to produce new cells. Heterocystous cells can perform nitrogen fixation by absorbing free nitrogen in the air and transform free nitrogen to organic substances that may be used to fertilize the soil. The number and position of heterocysts are important features used to classify blue-green algae. There are 4 families, 4 genus and 6 species of marine blue-green algae reported from Taiwan.

   There are 4 families, 4 genus and 6 species of marine blue-green algae reported from Taiwan.
 
 
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