Photo of the Week – December 26, 2014

The sun finally reappeared this week after what seemed like a month of absence.  I figured the best way to celebrate the end of dreariness was a couple of prairie hikes. I started by wandering along a creek at our Platte River Prairies to see what the resident beaver family had been up to.  Green sunfish slipped in and out of hiding places in the deep pools behind beaver dams, but little else was moving in the water.  Later, the sound of frantic chirping turned my head in time to watch a sharp-shinned hawk just miss its prey.  I couldn’t tell what kind of bird the hawk was chasing because it didn’t stop flying until it was out of sight.  I also caught a quick glimpse of a small mouse scooting through the thatch, spotted a perched eagle in a far off tree and flushed a small flock of mallards from an backwater wetland.  Not a bad way to spend an afternoon!

Later in the day, I stopped at our family prairie and roamed around until the sun went down.  As the sun dropped, its warm light illuminated the golden brown prairie and I managed to take a few photographs – something I’ve not done much of lately.  Here are a few of those photos.

A stiff goldenrod seed is stuck in the velcro-like hairs on the stem of a plant of the same species.  Helzer family prairie, Stockham, Nebraska.

A stiff goldenrod seed is stuck in the velcro-like hairs on the stem of a plant of the same species. Helzer family prairie, Stockham, Nebraska.

A Flodman's thistle (native species) stands out against the sky.

A Flodman’s thistle (native species) stands out against the sky.

The spiny beauty of Flodman's thistle seed heads.

The spiny beauty of Flodman’s thistle seed heads.

Tall dropseed (Sporobolus compositus) in golden prairie.

Tall dropseed (Sporobolus compositus) in golden light.

Stiff goldenrod

A stand of stiff goldenrod and mixed-grass prairie.

Happy Holidays, and best wishes for your New Year!

Survival of the Fittest?

He was engaging and informative – feeding our tour group piece after piece of the fascinating history of the people and landscape of the Wildcat Hills Landscape.  The first guest speaker on the 2014 Nebraska Natural Legacy Conference Field Trip to the Loess Hills was really fantastic.  But as I was listening to him, I was wandering around the outside of the group with my eyes (as they often are) scanning the ground, looking for something small and interesting.

…And that’s how I found this darkling beetle.  It was plodding steadily along through sparse vegetation with no apparent concern that it was readily visible to any predator passing by.  Before I knew it, I was lying flat on my belly with my camera, photographing this intriguing little creature (while still listening, of course, to the captivating speaker…).

Darkling beetle

Darkling beetle

Thanks to James Trager and Ted MacRae, I can tell you that not only is this a darkling beetle, it is one of about 263 described species of asidine darkling beetles in North America (Coleoptera: Tenebrionidae: Asidini).  I did some reading about asidine darkling beetles and came away with many more questions than answers – which happens every time I research any creature…  My biggest question was this: how do these beetles avoid getting eaten by every predator they encounter?

The beetles in the Asidini tribe are flightless, and supposedly rely on camouflage as a major defense strategy.  I don’t know about you, but this one doesn’t look to me as if it’s particularly well camouflaged, except maybe at night.  The other defense ascribed to asidine darkling beetles is that they resemble another group of darkling beetles that has a chemical defense strategy involving a nasty smelling substance that blisters the skin of humans (and probably other predators).

Mimicry is fine and good, but depends upon potential predators being familiar with the dangerous creature you resemble.  That seems like a long shot, given the number of predators running around – how many have had experience with nasty-smell-emitting darkling beetles?  Regardless, the slow flightless beetle I photographed seemed either supremely confident or blissfully ignorant as it trucked along, fully exposed to the world.  It sure didn’t look like it could outrun a hungry bird or other large predator, and it wasn’t making any obvious effort stay under cover as it moved around in the middle of the day.  Seriously, how the heck is this species still around?

Look, what do I know?  Maybe potential predators are well aware of the existence of the stinky blistering-chemical-emitting critters these asidine darkling beetles look like.  Maybe that awareness doesn’t come from from personal experience but instead is embedded deep in the DNA of those predators.  Doubtful?  Think about all the people you know who are deathly afraid of spiders or snakes, even though they’ve had no personal negative experience with them.

One way or another, there seem to be plenty of asidine darkling beetles lumbering through the world, and they’ve apparently been doing it for thousands of years.  They must be doing something right.  Good for them.

I wish them luck.