Blue Sky - Blue Dasher
|[Note Guidelines] Photographer's Note|
|I went down to the pond a few days ago and watched this male Blue Dasher, hoping he would choose the highest perch and I could get a clear shot of him against the late afternoon sky. In short time he cooperated and I got the lowest POV I could and took the shot.|
Blue Dasher(Pachydiplax longipennis)
Size: Total length: 28-45 mm; abdomen: 23-35 mm; hindwing: 30-43 mm.
Distribution: Throughout southern Canada and U.S. except Great Basin; also Mexico, Bermuda, Bahamas and Belize.
Identification: It has a white face and the top of the frons is metallic blue in mature individuals of both sexes. The eyes are brilliant blue or green in males and reddish-brown in females. The front of the thorax is brown with a thin pale carina medially and a wider pale stripe on either side. The sides are pale green with three full-length brown stripes. The wings are typically clear but may be flavescent and have a dark brown stripe on either side of the midbasal space in males. The legs are black and heavily armed. The abdomen is black with a pair of pale yellow stripes dorsally, interrupted on segments 3-8 to appear as dashes. Segment 9 and the caudal appendages are black, while 10 is pale. The abdomen is considerably shorter than in females. Older males develop a pale pruinose blue color dorsally and more slowly laterally on the thorax and over the entire abdomen. Females become pruinose, but much more slowly than males.
Habitat: Ponds, lakes, marshes, ditches, slow streams and other quiet bodies of water.
Discussion: This species is found around nearly any standing body of water where it is often the most common and abundant species. iIt ranks as one of the most well studied dragonflies in North America. The Blue Dasher is often seen perched horizontally on twigs and branches at a variety of heights from just above ground level to tree tops with the wings depressed downward. On warmer days individuals will raise the abdomen in an obelisk position, reducing heat absorbance. They are aggressive predators, regularly taking over 10% of their body weight in prey daily. Adults roost in trees and are occasionally attracted to lights at night. This species will defend favored feeding sites for several days in a row. Breeding territories are established along the shoreline, where males will investigate all intruders, and defend and chase other males out by raising their pruinose blue abdomen. Multiple territories may be established in a single day. Mating takes place while in flight or perched and may last from 1/2 to 2 minutes. The male will guard the female from a nearby perch while she deposits eggs by flying low over the water and repeatedly tapping the abdomen to the surface, but never bobbing the entire body up and down. She may lay 300-700 eggs in only 35 seconds, usually in a heavily vegetated pond margin. Females remain farther back from the water when not laying eggs or mating. The tremendous variation in size within this species is generally correlated with larger individuals during the spring months and progressively smaller ones occurring in the summer and fall. One study found larvae of this species had a strong preference for the leaf axil area of the aquatic plants they were associated with. This provides them protection and makes them less susceptible to fish predation.
Aperture = f8.0
Shutter = 1/320s
ISO = 400
Focal Length = 225mm
Canon EF 70-300mm f/4-5.6 IS USM lens
vanderschelden, maurydv, Vinster, rcrick, sandpiper2, nglen, Alex99, GLEM has marked this note useful
Only registered TrekNature members may rate photo notes.
|You must be logged in to start a discussion.|
I'm quite convinced this is a wonderful shot, Ken.
A cooperating Blue Dasher:-). And I agree the POV is effective. Furthermore the DOF is accurate.
Interessante taglio compositivo per questa macro, ottima nitidezza anche se ovviamente impossibile con questo POV ottenere un'adeguata DOF, molto belli i colori. Grazie e complimenti. Ciao Maurizio
- [2008-06-26 0:07]
Excellent macro.Sharp image with great details.Colors and light are excellent.
Wonderful shot of this Blue Dasher, the detail is just superb, and the colours are stunning, perfect composition and framing, really nice work all the best,
Cheers Rick :)
Great shot of this beaut dragon.
Great POV and crystal clear sharpness and details.
Great DOf and background.
- [2008-06-26 11:57]
Hi Just got home from work so running a bit late tonight so just a note to say good picture for now. TFS.
- [2008-06-26 22:25]
Thanks for next brilliant shot of the true beauty. Scene cannot be better and classic for dragonflies. Tremendous DOF, sharpness and details. Despite the strong sunlight all parts of the shot are exposed precisely. I like vivid colours of the picture and great composition. Bravo. Well done.
- [2008-06-28 12:50]
une fois encore une superbe image de libellule. Magnifique couleurs, netteté bien dosée et pov extra.
- [2008-06-29 9:06]
Outstanding shot of this beautiful Blue Dasher with such lovely colours and sharpness. Fabulous pose captured and the blue eyes look fantastic. The blue sky as BG looks so special. Excellent DOF, POV and composition. Kudos.
- [2008-07-02 21:47]
A lovely pose captured.
The focus and details are wonderful.
The colours are beautiful.
Excellent pov and dof.