Difference between revisions of "Pollution and algae"

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<u>'''Heavy metals'''</u>
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Algae are known to accumulate both metals and organochlorine compounds. <ref>Elliot, M.; Hemingway, K. (2002). Fishes in estuaries. Blackwell Science: London, UK. 636 pp.</ref> Heavy metals can depress algal growth when they are present above a certain threshold level. They can also destabilize their cell membrane. This inhibits the cell division or causes the algae change shape.  <ref>Md. Shahidul Islam and Masaru Tanaka, 2004, Impacts of pollution on coastal and marine ecosystems including coastal and marine fisheries and approach for management: a review and synthesis, Marine Pollution Bulletin Volume 48, 7-8 Pages 624-649.</ref>
  
Algae contain higher concentrations of metals than the surrounding water. <ref>Elliot, M.; Hemingway, K. (2002). Fishes in estuaries. Blackwell Science: London, UK. 636 pp.</ref>
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Organochlorine compounds can also inhibit photosynthesis and algae cell growth. However, there seems to be a wide range in the tolerance of algae towards these compounds. Therefore the compounds might be a threat to the algae biodiversity and seasonal cycles of algae. <ref>https://kb.osu.edu/dspace/bitstream/1811/5666/1/V72N01_006.pdf</ref>
 
 
Heavy metals are known to be able to depress algal growth when they are present above a certain threshold level. They also destabilize the cel membrane of algae, this causes the algae change their shape, or inhibit the celdivision, causing the algae to grow.  <ref>Md. Shahidul Islam and Masaru Tanaka, 2004, Impacts of pollution on coastal and marine ecosystems including coastal and marine fisheries and approach for management: a review and synthesis, Marine Pollution Bulletin Volume 48, 7-8 Pages 624-649.</ref>
 
 
 
<u>'''Organochlorine compounds'''</u>
 
 
 
DDT inhibits photosynthesis and growth  
 
DDT accumulates in algae, it adsorbs to the lipids of the algae, enriching the algae concentration towards the environmental. However, there seems to be a wide range in the tolerance of algae towards these compounds. Therefore the compounds might be a threat to the algae biodiversity and seasonal cycles of algae.  
 
<ref>https://kb.osu.edu/dspace/bitstream/1811/5666/1/V72N01_006.pdf</ref>
 
  
  

Revision as of 13:31, 22 July 2009

Algae are known to accumulate both metals and organochlorine compounds. [1] Heavy metals can depress algal growth when they are present above a certain threshold level. They can also destabilize their cell membrane. This inhibits the cell division or causes the algae change shape. [2]

Organochlorine compounds can also inhibit photosynthesis and algae cell growth. However, there seems to be a wide range in the tolerance of algae towards these compounds. Therefore the compounds might be a threat to the algae biodiversity and seasonal cycles of algae. [3]


Case studies

Case study 1:PCBs and organochlorine pesticides in Antarctic algae[4]



References

  1. Elliot, M.; Hemingway, K. (2002). Fishes in estuaries. Blackwell Science: London, UK. 636 pp.
  2. Md. Shahidul Islam and Masaru Tanaka, 2004, Impacts of pollution on coastal and marine ecosystems including coastal and marine fisheries and approach for management: a review and synthesis, Marine Pollution Bulletin Volume 48, 7-8 Pages 624-649.
  3. https://kb.osu.edu/dspace/bitstream/1811/5666/1/V72N01_006.pdf
  4. Joiris, C.R.; Overloop, W. (1991). PCBs and organochlorine pesticides in phytoplankton and zooplankton in the Indian sector of the Southern ocean. Antarctic Science 3: 371-377