a red Blue-Green alga

Images made through a microscope. All subject types.

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Franz Neidl
Posts: 747
Joined: Wed Jan 14, 2009 11:59 am
Location: Italy

a red Blue-Green alga

Post by Franz Neidl »

I found in marine plancton this red blue-green alga (Bacteriophyceae). The filaments were 5 µm thick. I think this is an Oscillatoria, but I am not shure. Somebody can help me?
Two pictures with obj. 40X, DIC

Franz


Image

Image

Charles Krebs
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Joined: Tue Aug 01, 2006 8:02 pm
Location: Issaquah, WA USA
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Post by Charles Krebs »

I like the second image a great deal.

Can't really help with the ID, but I don't see a distinct mucilage "sheath", which would rule out some other similar looking cyanobacteria.

fpelectronica
Posts: 1808
Joined: Fri Feb 19, 2010 3:56 pm
Location: España

Post by fpelectronica »

Hello Franz
Phormidium?
Francisco

Mitch640
Posts: 2137
Joined: Sun Aug 15, 2010 1:43 pm

Post by Mitch640 »

Great images Franz. Do you know what the red comes from? Very neat looking twisted algae in #1.

uaalgae
Posts: 30
Joined: Sat Jan 07, 2012 8:51 pm
Location: Department of Biology, The University of Akron, Akron, OH.

red color

Post by uaalgae »

Blue-green algae have two special water-soluble pigments - phycocyanin and phycoerythrin. The first pigment combined with chlorophyll a gives the algae a blue color. Under stress, the blue-green may express more phycoerythrin which will turn the alga red. Red algae have a lot of phycoerythrin and is therefore very red.
uaalgae

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