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I believe I found some Haematococcus pluvialis in my birdbath, which apparently is where they commonly occur due to the high sunlight. The red astaxanthin pigments are UV protective. It looked like the rotifers were preferentially eating them.

#algae #protists #microscope

Microscope image. Is red spherical algae, surrounded by an assortment of other algae, some green and filamentous. Not as sharp as I would have liked.
Another microscope image of a rotifer dyed red, presumably from eating H. pluvialis cells, surrounded by various other algae.
#protists #microscope #algae

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