Prairie Noise

I just finished a great but very long day at the Niobrara Valley Preserve.  We were collecting sweep net data and counting flowering plants to evaluate the impacts of various fire and grazing treatments.  There was a lot of action in the prairie – an up close encounter with a pronghorn mother and twins, coyotes calling to each other just over the hill, 5 species of prairie clover blooming, wasps and bees everywhere, and loads of robber flies and assassin bugs going after those wasps, bees, and other insects.

However, what was most noticeable in the prairie today was the sound of cicadas.  The really loud incessant sound of cicadas.  They were calling to each other from perches on grasses, wildflowers, and shrubs, and flushing in front of us all day as we moved through the grassland.  The cicadas were most abundant and noisy in the depressions between hills, where they were protected from the moderate breeze.  I snuck up on one to get some video of it and then realized that I hadn’t yet figured out how to use the video function on my new camera.  After that cicada flew away unphotographed, I figured out the video function and then stalked a few more cicadas until I found one that let me get close enough to get both photographs and videos of it.

Often incorrectly called “locusts”, cicadas are pretty common during the heat of the summer, and they come in a variety of species.  As with many other animals, the males make loud sounds to attract females.  When a bunch of them are calling simultaneously, the sound can be incredibly loud, especially for such small insects.  Here’s a quick video from today:

Spider Watching

I think this is a juvenile Argiope spider.  With its legs fully spread, it was about the diameter of a quarter, and its web was about the size of my hand.

During a brief stop at our family’s prairie this morning, I noticed a small spider on its web, and set up my tripod to see if I could photograph it.  Just after I got a couple nice photos, a grasshopper nymph blundered into its web, and the spider leapt into action.  I tried to get pictures of it as it was quickly wrapping the little grasshopper, but I only managed one – it was moving quickly, and there was some vegetation in the way.

I managed to get this shot when the spider paused briefly while wrapping the grasshopper nymph. The image is a little fuzzy because I was shooting through some grass leaves, trying not to disturb the action.

However, once it had its prey stabilized, the spider slowed down and I was able to watch and photograph it for the next 10 minutes or so as it waited for the nymph to become sufficiently paralyzed.  When I finally had to leave, the spider hadn’t yet started to feed.  Instead, it was perched above the nymph with two legs resting on the nymph like it was feeling for a pulse.  Every time the nymph twitched, the spider quickly pulled its legs back as if it had touched a hot stove.  Very carefully, I pulled my tripod away and left the spider to its meal.

This was shortly after the spider finished the wrapping process. You can still see the silk attached to its spinnerets (near its rear end).

…waiting for the grasshopper to stop kicking… I assume spider got to eat it eventually, but I had to get to work.