www.photomacrography.net :: View topic - Green Hydra
www.photomacrography.net Forum Index
An online community dedicated to the practices of photomacrography, close-up and macro photography, and photomicrography.
Photomacrography Front Page Amateurmicrography Front Page
Old Forums/Galleries
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Green Hydra

 
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Photography Through the Microscope
View previous topic :: View next topic  
Author Message
gpmatthews



Joined: 03 Aug 2006
Posts: 1030
Location: Horsham, W. Sussex, UK

PostPosted: Sat Oct 14, 2006 11:30 am    Post subject: Green Hydra Reply with quote



Microscope: Zeiss Standard GFL
Objective: Zeiss 10/0.22 plan achro
Ocular: Olympus P15
Brightfield/blue filter
Camera: Canon Powershot S50
Sample from Warnham Millpond 08-Oct-2006

This first image shows as much of a small green hydra as I could get in one shot.




Microscope: Zeiss Standard GFL
Objective: Leitz 40/0.7 NPL Fluotar ICT
Ocular: Olympus P15
Substage: Leitz ICT
DIC
Camera: Canon Powershot S50
ISO200, F4.9, 1/8 sec
Sample from Warnham Millpond 08-Oct-2006

This second image is of the tip of a hydra tentacle. The ovoid structures with the teardrop centres are cnidoblasts. Each contains a nematocyst. The cnidoblast is touch sensitive and will discharge the nematocyst on contact. The nematocyst "dart" is poisonous and will paralyse prey. You can see some have been discharged by the hair-like features at right angles to the tentacle. The green colour is due to symbiotic algae. Some of these hydra had ingested small chyronomid midge larvae - you could see the heads and some body parts remaining within the hydra.
_________________
Graham

Though we lean upon the same balustrade, the colours of the mountain are different.
Back to top
View user's profile Send private message Visit poster's website
Cyclops



Joined: 05 Aug 2006
Posts: 2968
Location: North East of England

PostPosted: Sat Oct 14, 2006 11:48 am    Post subject: Reply with quote

Nice shots! I thought the second image was a Water Bear at first. Wink
_________________
Canon 30D | Canon IXUS 265HS | Cosina 100mm f3.5 macro | EF 75-300 f4.5-5.6 USM III | EF 50 f1.8 II | Slik 88 tripod | Apex Practicioner monocular microscope
Back to top
View user's profile Send private message Visit poster's website MSN Messenger
beetleman



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

PostPosted: Sat Oct 14, 2006 3:45 pm    Post subject: Reply with quote

Very nice hydra shots and the tip shot is very cool. I would hate to be a small creature in a pond with these things around Shocked
_________________
Take Nothing but Pictures--Leave Nothing but Footprints.
Doug Breda
Back to top
View user's profile Send private message Send e-mail
Ken Ramos



Joined: 27 Jul 2006
Posts: 7076
Location: lat=35.4005&lon=-81.9841

PostPosted: Sat Oct 14, 2006 4:12 pm    Post subject: Reply with quote

Nice shot(s) there Graham, looks as though you captured some of the stinging cells quite nicely. I haven't seen a hydra in about two years now. I have got to go and collect some samples here soon, with the weather turning cool such as it is. Very Happy
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Photography Through the Microscope All times are GMT - 7 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group