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Green testate amoeba

 
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Charles Krebs



Joined: 01 Aug 2006
Posts: 5803
Location: Issaquah, WA USA

PostPosted: Sun Oct 01, 2006 9:12 pm    Post subject: Green testate amoeba Reply with quote

Found these testate amoeba and was curious about the green color. Couldn't quite figure it out until I came upon one where the test had been crushed by the cover slip. The amoeba appears to be full of zoochlorella, a single celled, symbiotic algae. On the first two shots I used a very small amount of cross polarization. Many of the quartz particles in the test would "glow" under cross polarization.

Olympus 20/0.70 objective. Brightfield illumination with slightly crossed polarization.



Olympus 20/0.70 objective. Brightfield illumination with slightly crossed polarization.



Olympus 100/1.40 objective. Brightfield illumination.
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rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 19090
Location: Richland, Washington State, USA

PostPosted: Sun Oct 01, 2006 10:22 pm    Post subject: Reply with quote

Beautiful photos, and great observation! To paraphrase the Aladdin movie, "An entire ecosystem, in an itty-bitty living space!". Very Happy

--Rik
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bernhardinho



Joined: 13 Aug 2006
Posts: 560
Location: Germany

PostPosted: Mon Oct 02, 2006 6:53 am    Post subject: Reply with quote

Hi Charles,

it's simply not fair that the finest photographers also encounter the most interesting specimens!! According to my book it could be Difflugia lobostoma which is known to feature zoochlorella.

Best wishes

Bernhard
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beetleman



Joined: 04 Aug 2006
Posts: 3578
Location: Southern New Hampshire USA

PostPosted: Mon Oct 02, 2006 4:49 pm    Post subject: Reply with quote

Very beautiful pictures Charles. I wonder if these small creatures would loose their symbiotic algae if they were enviromentally stressed like corals do when they bleach out due to stress?
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