The Gluttonous Crab Spider

The following post was written by Evan Barrientos, of our two Hubbard Fellows for this year.  Evan is a talented writer and photographer, and if you enjoy this post, I encourage you to check out his personal blog as well.  …For the record, I did not in any way encourage Evan to photograph or write about crab spiders.  This is despite my well-known affinity for them and my personal inability to walk past one without taking its portrait.

Over this summer I’ve tried to focus on photographing the prairies with a wide angle in order to show what the landscape looks like, but sometimes it’s just impossible to resist delving into the tiny details and dramas of prairie microfauna. One morning in June I was admiring the spiderwort flowers when I stopped to photograph a crab spider (Thomisidae sp.) sucking the juices out of a hoverfly (Syrphidae sp.) that she had caught.

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If you’ve been reading this blog for a while, you’ll know that many crab spiders hide on flowers and ambush insects as they stop for a drink of nectar (similar to ambush bugs). Some crab spiders can even change their color to yellow or white in order to match the flower they are on, but this spider didn’t seem to need that trick. To my great surprise, a second hoverfly was brave, hungry, or stupid enough to land on the same flower while I was taking photos. Maybe it thought the spider would be content with the hoverfly already in her fangs. It was wrong.

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The spider quickly honed in on the intrepid visitor, even though her fangs were already more than full. What she planned to do with the second hoverfly, I don’t really know, but  watch what happened when the clueless hoverfly strayed a little too close:

 

Apparently, this hoverfly liked adrenaline, because it continued to gorge itself on delicious spiderwort nectar for a few more moments and eventually flew off to safety. Thinking the spectacle had ended, I started to pack up my camera gear, but before I could, another fly landed on the flower!

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As you can see from the photo sequence, the spider was once again too slow to catch the visitor. I watched her for a little longer, but eventually left to photograph a bird singing nearby. I came back a few minutes later to check on the spider and found yet another surprise.

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In the five minutes I was away, the crab spider had finished eating the first hoverfly and caught another one. I don’t know if spiderworts are irresistible to flies, or if hoverflies are terrible at spotting white crab spiders on purple flowers, but this spider sure was lucky that morning!

Encounters like this remind me how important it is to pause every once in a while and notice the little details. When I do this I’m often amazed by how much is going on around me and how much I would have missed it if I hadn’t stopped. Wide-angle views certainly have their place too, but to fall in love with prairies you really need to stick your nose in them at times.

Photo of the Week – August 21, 2015

How could you look at this spider and not think it’s cute?

Jumping spider. Helzer yard. Aurora, Nebraska.

This beautiful jumping spider was in my background last weekend.  I cajoled it onto a piece of cypress mulch and took its portrait.  The crazy green color in the background is the underside of a maple leaf I put beneath the wood chip.  Doesn’t it look like a cute little teddy bear?  (Or an Ewok?)

Unfortunately, many people will look at this photo and recoil.  I’ve gotten so used to handling and admiring spiders and other invertebrates that I forget most of the human population is much less comfortable with them.  I wish I could help; spiders (and other “creepy” invertebrates) are incredibly important, but it’s hard to have a conservation discussion about them when the person you’re talking to is covering their face in disgust and fear.

I get that many people have a very strong visceral reaction to spiders (and/or snakes), and I’m not trying to minimize or mock that.  In fact, I can relate.  My own initial reaction to seeing a snake in the wild is usually to take a quick step backward.  However, I’ve spent enough time getting comfortable with snakes that after that first backward step, my next move is usually to try to catch them to get a better look.  Experience helped me conquer my discomfort and turn it into admiration.  I think the same would help most people deal with snakes, spiders and others, but getting the majority of the public that kind of direct exposure and experience seems unlikely.

Here’s a compromise.  We don’t need everyone in the world to love spiders and snakes to the point where they try to cuddle every one they find.  Instead, it’d be great if people could just understand that spiders and snakes are critically important components of complex ecological systems rather than nasty creatures to stomp on or chop with shovels.

I don’t expect anyone to transform from spider hater to spider cuddler just because I say spiders are cute and ecologically valuable.  However, maybe I can nudge the ball in the right direction by pointing out some mythology about the danger of spiders.  Let’s start with this:  Almost no one reading this blog post will ever encounter a spider that will pose any danger to their health.  Seriously.  The vast majority of spiders can’t even bite you – their little fangs can’t penetrate your skin.  With very few exceptions reported “spider bites” turn out to be something else.  SPIDERS DON’T WANT TO HURT YOU.  I’ve handled countless spiders of many many varieties and have never had one act aggressively toward me, let alone try to bite me.

I’m not going to tell you there are no dangerous spiders.  There are a few species that can cause you harm, but the chances of running into one of them are pretty slim, especially in Nebraska and most other midwestern U.S states.  Really slim.  And if you do happen to encounter one, they’re not going to jump up and bite you on the throat.  I promise.  Also, they are not going to lay their eggs inside you so that your face (or other body part) swells up until it eventually bursts and thousands of tiny spiders come out.  Not going to happen.  That’s a particularly vivid, but completely false urban legend.

Spiders are just tiny creatures trying to survive in a dangerous world.  Just like you, though possibly cuter – I don’t know, I haven’t met all of you.  Maybe you don’t want to pick spiders up and play with them.  That’s cool.  But  maybe you don’t have to kill every spider you see because you figure it’s either them or you.  It’s not.  They’re just trying to find something to eat and avoid being eaten themselves.  Ignore them.  Or catch them in a cup and take them to a safe place.  Or, if you’re feeling really crazy, pick them up, put them on a wood chip and take pictures of their adorable little faces.

Here are two more links that talk about spider bites and other myths, in case you’re interested:

http://www.burkemuseum.org/spidermyth/

http://arthropodecology.com/2012/02/15/spiders-do-not-bite/