A Weekend Walk in the Woods

We visited family in eastern Nebraska this weekend.  My in-laws have an oak woodland that I’ve become familiar with over the years, and I was glad to have a little time to wander through it.  Because of the cool spring, I was curious to see if anything had started blooming.  Trout lilies, dutchman’s breeches, violets, and other wildflowers were up and growing, but the only flowers I found weren’t really flowers – they were moss sporophytes …and even they were few and far between.

The only blooms in the oak woodland weren't even real flowers.

This patch of moss was one of the few patches in “bloom” this weekend in an oak woodland south of Omaha, Nebraska.

By mid-April in most years, I would have expected to see violets in bloom, and would have had a decent shot at seeing flowers on trout lilies and woodland phlox as well.  Not this year.  Instead, I gave up on flowers and spent some fruitless time trying to find one of the chorus frogs that were calling down by the creek.  Having failed at that, I went back up the hill and looked more closely at the moss.  Why fight it?

A close-up of moss sporophytes.  Sarpy County, Nebraska.

A close-up of moss sporophytes. Sarpy County, Nebraska.

Ironically, the most colorful things I found in the woods weren’t plants, but invertebrates.  I saw several tiny red mites crawling around in the leaf litter – including the one below, which contrasted nicely with the lush green moss it was exploring.

A tiny red mite

A tiny red mite, about 2mm long.  Photographed with a Nikon 105mm lens and extension tubes on a Nikon D300s camera, assisted by two small flash units.

Spring flowers will come eventually.  In the meantime, the delayed growth does have its advantages.  In both woodlands and prairies, soil moisture is still low from last season’s drought.  The longer it takes for plants to start using water, the more moisture will be left for summer wildflowers.  Personally, I’m in no big rush.

Photo of the Week – April 11, 2013

Sometimes, you can see a lot by just sitting down.

I carved out some time in the field last Friday to collect data on poison hemlock in our research plots.  After finishing that, I had about half an hour before I needed to head back to the office, so I took my camera for a walk along the creek running through our Platte River Prairies.  Not having a particular agenda, I stopped to look at a tree that had been recently felled by beavers.

This tree, cut down by our local beavers, had sap seeping from the stump last week.  The Nature Conservancy's Platte River Prairies, Nebraska.

This tree, cut down by our local beavers, had sap seeping from the stump last week. The Nature Conservancy’s Platte River Prairies, Nebraska.

As I was admiring the patterns of tooth marks on the stump, I noticed an interesting-looking little fly hanging around.  As I watched, the fly started to feed on the sap that was oozing out of the tree.  Taking advantage of the fact that the fly was distracted by its meal, I managed to get a couple photos of it.

This fly seemed to be enjoying its meal enough that it didn't mind me sticking my lens in its face.

This fly seemed to be enjoying its meal enough that it didn’t mind me sticking my lens in its face.

Since I had time, I decided to sit and watch the fly for a bit.  Before long, another – different – fly came along.

A second fly joins the meal.

A second fly joins the meal.

One of my favorite statistics is that there are more than 37,000 species of flies in North America.  That seems an almost unfathomable diversity.  Taking that into account, I guess I shouldn’t have been surprised to see a third kind of fly arrive at the stump…

Fly #3.  A big green one.

Fly #3. A big one with blue and green stripes on its abdomen.

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A rear view of fly #3, showing the striped abdomen.

A rear view of fly #3, showing the striped abdomen.

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A tiny wasp (2mm long).

A tiny chalcidoid wasp was on the stump as well, though not feeding on sap (thanks to Mike Arduser for identifying it for me – Mike says they are a group of parasitic and important wasps).  The quality of this image isn’t very good – my excuse is that the wasp was BARELY 2mm LONG and I had to crop it quite a bit so you could even see it…

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A tiny red mite came ambling along...

A tiny red mite came ambling along too…  It was about the same size as the little chalcidoid wasp

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Fly #3 didn't like Fly #1 working over the same puddle of sap and lunged at it

Fly #3 apparently didn’t like Fly #1 working over the same puddle of sap.  This photo captures Fly #1 rearing back as Fly #3 lunged at it.

I wish I’d had more time to stick around; it would have been fun to catalog all the little critters that visited – or were living in – that beaver stump.  I also wish I would have gotten a shot of the little wolf spider hiding in the pile of wood chips at the base of the stump – it darted out and almost caught one of the flies when it landed nearby, but didn’t stick around for a photo.  Too fast for me…

I think my short time watching the beaver stump brings up a number of interesting points that I could focus on as the overall theme of this blog post.  I could focus on the odd side benefits provided by the work beavers do.  I could focus on the crazy diversity of life found on a single tree stump.  I could focus on the way creatures of all different kinds are able to take advantage of unexpected resources (like oozing tree sap) when they appear.

But I think the biggest point is this:  You can see and learn an awful lot by just sitting down and watching.