General

Aug
06

Paramecium caudatum

Posted by sonntag

Bacteria of the genus Holospora (H. elegans, arrows) colonize the micronucleus (MI) of the ciliate Paramecium caudatum (‘endonuclear symbionts’). The bacteria actively invade the ciliate and the nucleus and are also given to the daughter cell during division. Some bacteria are also released to the environment to infect new hosts. The macronucleus is also visible […]

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Jun
12
Paramecium bursaria

Paramecium bursaria

Posted by sonntag

Paramecium bursaria (Video) is a model ciliate in protist science that lives in symbiosis with algae (green). Here, we see the characteristic two contractile vacuoles with the collecting channels, the cell mouth (slit-like depression with many moving cilia in the middle of the cell) and the macronucleus (appears ellipsoidal in grey).

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Jun
12

Vorticella chlorellata

Posted by sonntag

Individuals of Vorticella chlorellata posess a stalk with which they are attached to other plankton or debris. In this combination they are too large to be ingested by predators. The symbiotic algae (green) provide photosynthetic products to the ciliates and are able to synthesize UV sunscreen compounds (MAAs).

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Jun
12

Pelagostrombidium fallax

Posted by sonntag

Pelagostrombidium fallax feeds on planktonic algae and digests everything but the chloroplast (=’stolen chloroplast’ or ‘kleptoplast’). From the kleptoplasts (photosynthesis), the ciliate receives additional nutrients.

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Jun
12

Bursaridium sp.

Posted by sonntag

Bursaridium sp. is a ciliate living in the plankton of alpine lakes above the treeline. Compared to other planktonic ciliates it is a relatively large species (ca. 150 x 120 µm). Bursaridium sp. feeds on algae that provide UV sunscreen compounds (MAAs) to the ciliate.

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Jan
15

Urotricha castalia (video)

Posted by sonntag

Urotricha castalia is a heterotrophic ciliate feeding mainly on small algae that appear simultaneously in lake plankton. In video ‚Urotricha castalia 1‘, we see the contractile vacuole in the posterior end of the cell and several elongated caudal cilia. In the video ‚Urotricha castalia 2‘, we see a squeezed individual with many intracellular bacteria (symbionts? […]

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Jan
15

Uroleptus willii (video)

Posted by sonntag

Uroleptus willii is a ciliate thriving in lake plankton that can also build a mucous house, the so-called lorica. In the video, we see how U. willii feeds on bacteria or other small unicellular eukaryotes with its densely arranged ciliary bundles located at the tapering anterior. Characteristic for the species is that it lives in […]

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