Photo of the Week – July 24, 2014

I’m definitely a better close-up photographer than a landscape photographer.  Part of that is just the way my mind works – I tend to look down instead of up when I walk around a prairie.  I can always find an interesting flower or insect to photograph when the light is good for photography, but I have a harder time constructing an interesting composition or the larger landscape.  There are so many things to think about with landscape photos; foreground, background, sky, leading lines – or not… ack!  As a result, when the light is pretty, I usually look around for something small and interesting.

However, there are days and places where even I can take good landscape photos, and yesterday was a perfect example.  I got up early enough to drive the 35 minutes between my house and our Platte River Prairies before sunrise.  I’d been eyeing the prolific blooming of fourpoint evening primrose (Oenothera rhombipetala) in the sandhills on the edge of the river valley.  It’s been several years since we’ve seen a big explosion of primrose flowers, and this year’s seemed even more spectacular than the last one.

At the first glimpse of the sun, I knew it was a going to be good morning.  The Nature Conservancy's Platte River Prairies, Nebraska.

At the first glimpse of the sun, I knew it was a going to be good morning. The Nature Conservancy’s Platte River Prairies, Nebraska.

Before the sun popped over the horizon, I wandered around and pretended there was enough light to make good photographs, knowing that I was only shooting because digital photos are free…  Once the sun appeared, though, things got serious.

Goodness gracious

Fourpoint evening primroses all the way to the horizon.

How can you not take great photos when you’re surrounded by big yellow flowers, the sky is filled with gorgeous clouds, and the light is coming in low and warm?  I scurried around with my camera and tripod, trying composition after composition, and liking each one more than the one previous.  The biggest difficulty was trying to come up with photographs that really showed the size, scope, and abundance of the flowers in real life.  My wide angle lens felt insufficiently wide for the scene.

More primoses

More primroses

I ended up with hundreds of photographs of primroses.  I stayed up late last night trying to go through them and pick out a handful to use for today’s post.  I felt good when I narrowed them down to 20, but that’s way too many for one blog post – especially when they all look about the same…  I went to sleep dreaming about fields of yellow.

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This morning, I managed to narrow it down to the photos you see here, but it was painful.  Stop by sometime and I’ll show you the others…!

The ecology behind the photos

So why are there so many fourpoint evening primroses this year?  Across the sandy prairies of Nebraska, fourpoint primrose is having a good year, though maybe not as good of a year as sunflowers had last year.  Fourpoint evening primroses are biennial plants, so they typically germinate and form a rosette (just leaves, no vertical stems) in their first year of life and then bloom and die in their second – leaving behind many thousands of seeds to kickstart the next generation.  They are not strong competitors with grasses, so fourpoint primroses can’t germinate in years when the vegetation is dense.

Ok, I did take a FEW close-ups too.  Every day, the primose opens a new row of buds as the previous days' flowers wilt.  Judging by the unopened buds at the tops of these flowers, we'll be seeing yellow for a while yet.

Ok, I did take a FEW close-ups too. Every day, the primrose opens a new row of buds as the previous days’ flowers wilt. Judging by the unopened buds at the tops of these flowers, we’ll be seeing yellow for a while yet.

The year 2012 was the most severe one-year drought on record for our area.  That weakened the grasses in our sandhills prairie.  Coincidentally, however, we also burned and grazed those hills in 2012.  As a result, by July, the hills were covered in very short brown grass and not much else because the plants had given up and gone dormant in the face of intense grazing and no soil moisture.  It looked pretty tough.  We had better moisture in 2013, and the grasses started their slow recovery, but there was a lot of open space between them that was colonized by annual plants (such as annual sunflowers).  However, another major colonizer was fourpoint evening primrose.  Unlike the sunflowers, however, the primrose plants didn’t bloom last year – they bided their time and soaked in the sun, water, and nutrients made available by the low density of plants surrounding them.  Then, this summer – 2 years after the drought – they made their move and exploded onto the scene with resplendent glory.  Or something.  Anyway, they sure are pretty.

We’ve had lots of rain this year, and we’re not grazing those sandhills this year, so the grass is getting pretty dense beneath the primrose flowers.  That means we won’t see many primroses next year or the year after.  That’s ok, they’ll wait – and when the time is right, they’ll be back.

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Watching Wetland Water Levels – Timelapse Photography

It’s timelapse photography time again…  I downloaded more photos from the cameras at our restored wetland in the Platte River Prairies a couple weeks ago, and have been looking through the images for stories.  One theme that stood out in this batch was the variability of the water level in the wetland through time.

This wetland is directly connected to the water table, but is also supplied by a groundwater-fed stream that brings both rainwater and groundwater from about 25 miles west of us.  Platte River flows and irrigation pumping both influence the water table here in the Platte Valley, as does evapotranspiration by plants – and other factors.  It’s a complicated series of events and processes.  However, in general, we expect the water table to be relatively high in the spring and to decline as summer progresses.  I looked at photos from early June and early July (below) and that pattern of summer decline is apparent this year.

June 8, 2014

June 8, 2014.  A panoramic image created by merging photos from two adjacent timelapse cameras.

July 8, 2014

July 8, 2014.  You can click on each photo to see a larger/sharper version of it.

Seeing the pattern of water level rise and fall through weeks and months is interesting, and timelapse photography allows us to watch that pattern pretty easily.  However, it’s also interesting to look at shorter-duration patterns.  I shared one example of that back in December, with a series of images showing daily water level drops due to evapotranspiration.  Today, I’m sharing a second example of short-term water level changes – this time, it’s due to water coming downstream after a rain event.

In the early morning of June 21, 2014, a big storm system moved through our area, dumping between 2 and 4 inches of rain.  The map below shows the precipitation amounts from that storm.

This photo from http://water.weather.gov/precip/ shows rain amounts for our area on June 21.  The black arrow indicates the location of our wetland.

This image from the National Weather Service (http://water.weather.gov/precip/) shows rain amounts for our area on June 21. The black arrow indicates the location of our wetland.

Rainwater from the storm swelled the stream that flows into our wetland, but also created runoff flow throughout the watershed.  The Youtube video below shows the water level changes in our wetland through the day on June 21, 2014, starting at 7am and ending at 8pm.  The changing light conditions from image to image make it a little difficult to see, so you may have watch it several times to get the full effect.  The foreground, the green peninsula on the left, and the little island just left of center are all good landmarks to help see the water level change.

There’s nothing earth-shattering about stream or wetland water levels rising and falling after a big rain event.  On the other hand, it’s not often we get the opportunity to actually see it happen.  Timelapse photography gives us the opportunity to compress time and see natural processes from a different perspective.  For me, at least, that opportunity helps me better understand and appreciate the variability of the earth we live on.

As always, thanks to Moonshell Media for their help with this timelapse photography project.  If you’re interested in exploring timelapse photography for conservation purposes, you can contact them at 402 817 4313 or info@moonshellmedia.com.