surface bloom

[Rene]

One of those typical occurrences in a pond. Everyone will recognise it, but it never gets reported...

Video at

Greetings, René

[Michael Plewka]

Hi René,

One of those typical occurrences in a pond. Everyone will recognise it, but it never gets reported...

You are right: some habitats are under-represented in this forum. But you may have a look here:

https://www.mikroskopie-forum.de/index.php?topic=37258.msg274209#msg274209


Best wishes
Michael Plewka

[Rene]

Thanks Michael, didn't think about searching in the forum.

Yes, tricky stuff, polyphyletic groups galore. For the moment I'm putting it down to Chromulina aerophila, based on the little tubes it forms on the air-water boundary. Nevertheless, I do think I see a second small flagellum some now and then; the whole genus might be up for an overhaul...

Best, René

[rhamvossen]

Hi René,

Thanks for bringing this up. I hope you don't mind that I'm showing a picture here again from that same organism, from the ditches at our gardenpark. It looks like these cells contain some kind of gas vacuoles, what do you think? Best,

Rolf

[Rene]

Dank je Rolf, Michael wees me al op je beelden. Feit is dat iedereen het waas op het water wel herkent, maar weinigen weten wat er precies achter steekt.
Ze reguleren hun drijfvermogen met olie, verder zijn je cellen goed gevuld met grote blaasjes met chrysolaminarine. Van de kleine lichtbrekende puntjes in de cellen durf ik niet meteen te zeggen wat het zijn, er zitten onder andere contractiele vacuolen bij aan de kant van de flagel. De groep is erg heterogeen, we gaan met genotypering nog veel verrassingen tegemoet zien.

Groet, René

[schmidt]

Hello Rene,

you are right it has two flagellae. The second is very short and lies often more or less parallel to the cell surface and easy to overlook.
I think it ist very similar to Chromophyton (old: Ochromonas) vischeri

pschmidt

[Rene]

Thanks pschmidt, it's a case of a second flagellum must be there so I detect it sometimes. Not a good basis for determination, but hopefully SEM will give me a better view.
The link to Chromophyton is correct, I also think it belongs there.

Best, René

[schmidt]

Hello Rene,

You use SEM ? Do you know this article by COUTE ?
https://eurekamag.com/research/029/503/029503452.php?srsltid=AfmBOorhfPQNWQAqXH96Vkeczu0m11YaMsvCZQ9xr2K1XFFKazsm1T_K

pschmidt

[Rene]

Yes, got a paper copy. My french is not the best (cough), so reading has to wait. But yes, active cells don't use the second flagellum, so it is hidden along the surface and difficult to detect.

 
Best, René

[Rene]

It's easier to detect the second flagellum when they travel over the water (right) to air boundary (left)