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Bristleworm Larvae & company & Rhabdonema(edited)

 
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WalterD



Joined: 06 Jul 2015
Posts: 195
Location: Rotterdam, the Netherlands

PostPosted: Wed Apr 19, 2017 9:37 pm    Post subject: Bristleworm Larvae & company & Rhabdonema(edited) Reply with quote

A sampling trip earlier this month brought me back to the marine microworld. In this part of the world the phenomenon "plankton bloom" pops up every year in the spring and early autumn. I understood this has got something to do with the environmental circumstances that provide availability of silica, the material from which diatom's "shells" have been constructed. At the bottom of the food chain, diatoms provide straightaway or indirectly, food for everything else that's living in the sea (and a substantial part of the world's oxygen production, but that's another story). So when diatoms prosper, the rest will also benefit.
This time the plankton net itself remained rather empty, a second sampling location close to the first one contained a versatile collection of algae and diatom material.
Diatoms growing together in something like tubes, diatoms overgrowing algae material and diatoms in other string and chainlike formations.
And in that diatom mix I discovered an extravagant Platynereis larvae, a bristle worm (1). A living specimen which I captured in a stack when it had its quiet moment.

The image has not been enhanced whatsoever, so that green belly was actually there. You can notice the characteristic bristle hairs developing, and a rudimentary variant too.
For the rest there were more youngsters in the vincinity of that plant material, including copepods in different stages and bell animacules (2).
The conclusion was we had to wait a couple more weeks to find that explosion of phytoplankton colouring the samples brownish green, anyhow as you can see it was worth the effort.

My special thanks to the founder and president of the Micropolitan Museum for his expertise and inspiration. Very Happy

1366 pixel resolution : https://we.tl/iwSz6JhZ9d

1 25x DIC




2 25x DIC




3 25x DIC



4 25x DIC



5 16x Polarization


6 25x DIC


Last edited by WalterD on Sat Apr 22, 2017 10:09 am; edited 2 times in total
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GaryB



Joined: 29 Jul 2016
Posts: 344

PostPosted: Fri Apr 21, 2017 4:31 am    Post subject: Reply with quote

Those are some really nice shots Very Happy
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carlos.uruguay



Joined: 23 Feb 2012
Posts: 4304
Location: Uruguay - Montevideo - America del Sur

PostPosted: Fri Apr 21, 2017 7:10 pm    Post subject: Reply with quote

Very nice!
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zzffnn



Joined: 22 May 2014
Posts: 1176
Location: Texas USA

PostPosted: Fri Apr 21, 2017 8:59 pm    Post subject: Reply with quote

Very interesting! Thank you for sharing.
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Jacek



Joined: 02 Oct 2011
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Location: Poland

PostPosted: Fri Apr 21, 2017 9:13 pm    Post subject: Reply with quote

Very nice
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Marek Mis



Joined: 10 Jul 2010
Posts: 2192
Location: Suwalki, Poland

PostPosted: Fri Apr 21, 2017 9:34 pm    Post subject: Reply with quote

Very nice images !
I am espacially impressed of the first one. Really nice shot.

Marek
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WalterD



Joined: 06 Jul 2015
Posts: 195
Location: Rotterdam, the Netherlands

PostPosted: Sat Apr 22, 2017 10:14 am    Post subject: Reply with quote

Glad to hear you like them. I've added six more photographs from the same sampling session. Besides the "usual suspects" image 9 shows diatom Rhabdonema which was growwing on red algae. A young copepod without head can be seen in image 10.







Thanks for looking
Shocked
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Charles Krebs



Joined: 01 Aug 2006
Posts: 5611
Location: Issaquah, WA USA

PostPosted: Sun Apr 23, 2017 4:07 pm    Post subject: Reply with quote

What a feast of subject matter! Excellent!

"Tube-dwelling" diatoms (last image) are always fascinating to me.
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carlos.uruguay



Joined: 23 Feb 2012
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PostPosted: Mon Apr 24, 2017 4:33 am    Post subject: Reply with quote

Super!
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WalterD



Joined: 06 Jul 2015
Posts: 195
Location: Rotterdam, the Netherlands

PostPosted: Mon Apr 24, 2017 8:17 am    Post subject: Reply with quote

Dear Charles and Carlos,

Thanks for your positive feedback!

Cheers,

Walter

Very Happy
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