Wednesday, September 6, 2017
Wednesday, August 30, 2017
A great many years ago I read an article about scientists studying dragonflies. The method for identifying a dragonfly in the field was to shoot the dragonfly with a shotgun shell filled with dirt. The body would be damaged, but usually enough of the wings would remain intact to determine the species. (The patterns of veins in insect wings are a key factor in establishing and identifying insect taxa; in fact, wing veins can be preserved in fossil insects, and used in the naming of species from millions of years ago.)
I’m not up on the state of the art in dragonfly research, but I have to wonder if the shotgunning is still necessary now that we have digital photography. Even with my amateur-level camera, I can get pictures of perching dragonflies that clearly show the details of wing venation.
Here are some from the last few years:
Monday, July 31, 2017
Friday, June 30, 2017
Wednesday, May 31, 2017
I’m almost always too busy or too tired to blog, but I try to have at least one post per month. I’m putting up this picture to give me something for May. It’s one of the results of my failed attempt to photograph the Pink Moon.
Sunday, April 30, 2017
In my recent internet browsing, I happened upon an odd fact of botany—there is a cactus which is native to eastern North America, the Eastern Prickly Pear (Opuntia humifusa). It occurs across the eastern half of the United States, and even in a few locations in southern Ontario.
It turns out that I saw, and photographed, some of these cacti during my vacation in Virginia Beach a few years ago.
Here are some prickly pears interspersed with other vegetation, near the beach.
Here is an isolated example from First Landing State Park.
I had previously thought that the cacti which I saw in coastal regions were exotics which had been introduced by humans, and then thrived in the sandy, desert-like beach conditions, in much the same way as the Texas Horned Lizard.
In fact, according to this site, the Eastern Prickly Pear is native to Fairfax and Prince William Counties (although I can’t think of any possible location in Fairfax or Prince William County that would be suitable cactus habitat).
(Well really that site says that the Eastern Prickly Pear is “naive” to Fairfax and Prince William Counties, but I assume that they meant “native”.)
Tuesday, April 11, 2017
I happened upon some news reports today that tonight is the night of the Pink Moon.
This is nothing particularly unusual, or particularly pink, it’s just the name given every year to the full moon that occurs in April.
(Earlier tonight the moon had an eerie mustard color, probably as a result of intervening cloud cover, but I couldn’t convince my camera to focus for a picture.)