<< Previous Next >>

*Walk on Water*


*Walk on Water*
Photo Information
Copyright: Txxx Bxxx (thor68) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 795 W: 138 N: 1319] (5674)
Genre: Animals
Medium: Color
Date Taken: 2006-08-13
Categories: Insects
Camera: Canon EOS 20D, Sigma EX 105mm F2.8 DG Macro, SanDisk CF 2GB, Hama sky 1A (LA+10) (IV) 58mm
Exposure: f/9.0, 1/60 seconds
Details: (Fill) Flash: Yes
Photo Version: Original Version, Workshop
Date Submitted: 2006-08-18 12:51
Viewed: 4566
Favorites: 1 [view]
Points: 44
[Note Guidelines] Photographer's Note
I did not only find Dragonflies at the
pond, but some water striders on the pond,
just standing or running around on the water.

It could be a Gérris nájas, but as usual i am not very sure of that.

***********************
The water strider, also known as the Jesus bug, pond
skater, skater, skimmer, water scooter, water skater,
water skeeter, water skimmer, or water spider, is any
of a number of predatory insects in the family
Gerridae (Leach, 1815) which rely on surface tension
to walk on top of water. They live on the surface of
ponds, slow streams, marshes, and other quiet waters.
They can move very quickly, up to 1.5 m/s, on the surface of water.

Animals such as water striders that live on the
surface of water need to push something backwards to
generate a reaction force (that is, Newton's third law
of motion).

It was originally thought that water striders
transferred momentum to the water by the creation of
capillary waves on the surface. However, biophysicist
Mark Denny showed that to do this, some object must
move faster than about 0.25 m/s—far faster than a
water strider can move its legs. This apparent
contradiction is known as Denny's paradox.

Water striders beat Denny's paradox by generating not
capillary waves but hemispherical vortices in the
water. These vortices carry sufficient backwards
momentum to propel the animal forwards.

In a series of experiments, mathematician David L. Hu
and coworkers showed that during the rowing stroke,
water striders drive their middle legs backwards
without penetrating the surface, and can attain speeds
of up to 1.5 m/s.

Besides skating on the surface of water, adult water
striders can also use wings (e.g. to fly to another
body of water).

[from: http://en.wikipedia.org/wiki/Water_strider]

******************
A second photo of a water strider can be seen in the workshop-section.

RAP, carper, ellis49, horia, marhowie, SkyF, giacomosg, jmp, liziafa, osse, TAZ, captainsgirl, undoredo has marked this note useful
Only registered TrekNature members may rate photo notes.
Add Critique [Critiquing Guidelines] 
Only registered TrekNature members may write critiques.
Discussions
ThreadThread Starter Messages Updated
on the waterwinterpalace 1 12-17 01:55
To saguzar: :-)thor68 1 08-18 14:06
You must be logged in to start a discussion.

Critiques [Translate]

  • Great 
  • RAP Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2524 W: 345 N: 2373] (7405)
  • [2006-08-18 13:02]

Excelente captura Thorsten, personalmente nunca había visto estos insectos.
Imagen inusual y muy estética con agradable atmósfera con adecuado POV y foco.
El efecto producido por las patas sobre la superficie del agua es muy atractivo.
Bonita entrega.
Saludos... Ricardo

Excellent capture Thorsten, I had personally never seen these insects.
Unusual and very aesthetic image with pleasant atmosphere with adequate POV and focus.
The effect produced by the paws on the surface of water is very attractive.
Nice post.
Greetings... Ricardo

  • Great 
  • pac Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 67 W: 13 N: 157] (1783)
  • [2006-08-18 13:04]

Super composition!

Well seen, well done!

/Dan

Hi Thorsten,
A very good shot, If I want to take one like this I must wait until summer, now there are a few minsects here.
The composition is good, showing the water superficial tension, the insect are well placed.
Don't you wet when you take it?
take care friend
Hernan

  • Great 
  • hester Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 1515 W: 18 N: 3165] (11638)
  • [2006-08-18 13:22]

Hi Thorsten

I used to be fascinated with pond skaters as a kid so it is lovely to see such a great shot of them. Amazing details for something that is so small and actually quite quick. I love the way you have captured how they use the water tension. Lovely light and colours as well

TFS

Karan

  • Great 
  • carper Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1973 W: 119 N: 2582] (8439)
  • [2006-08-18 14:06]

super macro Thorsten,
this is art with the camera, my compliments for this super job, I like it a lot.
gr. jaap

Hi Thorsten,
it's a breat post, we can see very clearly how the legs makes small pits in the surface ot the water without breaking it.
Well composed, good POV and details.
Great work.

Hi Thorsten,
genial - das ist absolut spitze!
Hab' noch nie so eine tolle Aufnahme von Wasserläufern gesehen, ganz super, Danke
Sabine - wishnugaruda

  • Great 
  • horia Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2158 W: 224 N: 4749] (16656)
  • [2006-08-18 16:11]

Hi Thor

This is really an amazing shot! Really!
I know how difficult it can be to capture these little guys since they allways move around all the time...you really did a great job!
Also great POV, giving a clear reflection on the water, makin the striders even more outstandind. Very good sharpness, framing and composition, too.

Bravo and TFS
Horia

  • Great 
  • SkyF Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2234 W: 188 N: 1912] (8073)
  • [2006-08-18 16:27]

Hallo Thorsten,
super ist dir diese Aufnahme gelunge. Sowas hate ich neulich versucht festzuhalten ist mir aber nicht gelungen. Prima Perspektive hast du gewaehlt, man sieht die tollen Details auf der Wasserobeflaeche. Prima Schaerfe und excellenter bildschnitt.
Sky

wonderful image,thor.
bravo
Giacomo

Hi Thorsten,
This is a original catch. Not easy to take I guess. I think it is the first time I see those insects on TN :) Very good details, lightning, contrast and composition. I love the glow on the water. I'm surprise by the 1/60 seconds speed... Those I usually see always move... Very well done! TFS,
Claudine

  • Great 
  • jmp Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1659 W: 95 N: 2273] (8415)
  • [2006-08-19 7:16]

Hi Thorsten,
A neat and clear image with a very good angle to show the depression in the water as an alteration of reflection. Excellent note too wiht physics included.
Your shot bring me to my childhood when I swam in a river among lots of water striders.
Thank for the post.
José M.

Hi Thor,
Amazing to view these insects able to walk on water. It is not very sharp, but I know it should not be easy to capture this tiny little guys, and you may not able to approach them any closer, since they were on water. Therefore, you deserve all of the credits.
Have a nice weekend, friend.

Ben Lakitan

Hi Thorsten,
Interesting close up.
Good details, DOF and BG.
Very well done!
TFS Malgosia

  • Great 
  • osse Gold Star Critiquer/Gold Note Writer [C: 955 W: 0 N: 89] (7805)
  • [2006-08-23 5:56]

Hi Thorsten
Great shot my friend. I test it few times but did't like the quality and did't send. Great sharpnes, details, light, DOF and POV. Also good note.
Great composition my friend.

osse

  • Great 
  • TAZ Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 2241 W: 47 N: 3167] (10926)
  • [2006-08-25 1:33]

What a nice shot ! It is funny to see these water walkers. I like to the tension on water under legs. I also appreciate the complementary note... Congratulations Thor and thanks for sharing.

Hi Thorsten,

These look very funny I think. Excellent captured by you!!

TFS Greetz Kristy

Hi Thorsten,
very well captured scene, I like this bugs gliding on the plain water surface. Nice close-up, thanks and best wishes,
Elena.
PS. See your gallery, and your photos are really very good!

wow, great detail and sharpness..actually a very peaceful photo...and ...hmm I never knew the name of these little guys, seen alot of them in ponds back in my homeland. TFS
Donna :o)

Hi Thorsten,
Great capture.
I love the way you got two of the water striders in the frame - their details are excellent. What makes this image a A+ for me are actually the sunken leaves - take them away and the image is not as amazing.
TFS - Shir

Hello Thorsten,
WoW!! This is very fantastic shot of the water strider. Beautiful!!
I can see the outstanding focusing and DOF here with excellent POV & composition.
Also, lovely colours and superb details here.
Well presented with this artistic mood.
TFS and best wishes,
Kevin
PS: Thanks for the kind words on my photo Blue Jay and appreciate that you've selected it as a favorite. :)

Hi Thorsten

If I had not started a theme, I would have to do it now after seeing this image. Unusual action photo.

TFS

Verite

Calibration Check
















0123456789ABCDEF