Update on Butterfly Numbers

This is a summary of my 37 years of data on the butterflies of the Pikes Peak Region. The following graphs show trends in abundances as measured by butterflies observed per hour afield. Each data point is a record of the number of butterflies observed per hour of observation time. First, the whole data set for the Pikes Peak Region, with tons of scatter:Regional Trend.png

This shows an almost flat line, but slightly increasing (from 69/h to 78/h). But when I restrict the data to only Bear Creek, where I have spent most of my time, we find:BCC Trenda negative slope (from 87/h to 80/h). And when graphed according to the average number per hour for each year, we get:mean BCC Trend.pnga more negative slope (from 102/h down to 79/h). This is surprising to me, as 11 years at an Austin Bluffs site shows no such decline:AB Trendeven when plotted according to annual averages:mean AB Trend.pngI also created box and whisker plots for the numbers of butterflies per hour for each summer month in Bear Creek!box plot databox plots.png

In sum, butterfly numbers appear generally stable in this region, but further study is always needed as we enter a hotter earth with more fires.

Listen to this while you read about my new Colorado butterfly.

Theme 113, with a flute and trombone.

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Zizula cyna [STATE RECORD]

My new butterfly record is of Zizula cyna, a tiny subtropical blue that should not be here. It was taken near the Section 16 Trail, as the label says. I will go back this summer to see if it might persist in that environment. It is not particularly unusual to find stray subtropical butterflies in Colorado, but one this tiny is hard to imagine. Perhaps it came on a car with travelers, but if so, it flew hundreds of yards to the locality in which I found it. So, maybe…

Butterflies of the Pikes Peak Region

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Pyrgininae

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HesperiinaeScreen Shot 2019-08-18 at 5.08.14 PM

PapilionidaeScreen Shot 2019-08-18 at 5.10.54 PM

PieridaeScreen Shot 2019-08-18 at 5.26.43 PM

Lycaenidae 1Screen Shot 2019-08-20 at 8.37.49 AM

Lycaenidae 2Screen Shot 2019-08-18 at 5.32.17 PM

NymphalinaeScreen Shot 2019-08-18 at 5.35.40 PM

Melit. & Arg.Screen Shot 2019-08-18 at 5.41.12 PM

SatyriinaeScreen Shot 2019-08-18 at 5.43.42 PM

Addendum: Here are species that I didn’t have on pins.Screen Shot 2019-08-25 at 12.08.02 PM.png

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These are 164 of the 206 species that have been recorded in El Paso County. Many of the rest are rare strays, but we may see them more commonly as the climate warms. Adelpha bredowi, for example, used to be a rare stray, but it shows up almost every year now in the region. I will continue to add to this set as new photos come in from the Pikes Peak Region, with your permission, of course.

More on the Insect Apocalypse

Here are the results from two sweep samples of insects taken ten years apart at exactly the same location on the Section 16 Trail west of Colorado Springs. In both cases, 100 sweeps were made. In this area, which is relatively undisturbed in terms of regular application of pesticides, herbicides, and insecticides, total numbers of insects seem very similar after ten years. T-Tests, both one-tailed and two-tailed, show p values that do not suggest significance. I chose a date one week later in 2019, as the season appears a bit behind average in terms of butterfly emergence dates.

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New Moths for 2018

The following moths, discovered by several workers in the region, are new to my database of species in the Pikes Peak Region. Thanks to Eric Eaton, Aaron Driscoll, Zach Vogel, and Van Truan for posting photos of some of these. The ones without initials are from my collection, mainly from the bioblitz at Corral Bluffs in September. At that site, on one night, I took ten species new to the region.12345678

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Thirty-six new species found in the area. Keep going, guys. This is fun.

The Rocks of Palisade Sill

DSC07273.jpgFor those not tuned in to Southwest Geology, a sill is an igneous intrusive that has inserted itself parallel to the surrounding strata (a dike runs at angles to the strata). Palisade Sill is a huge intrusive in northern New Mexico between Raton and Taos on Highway 64. You won’t miss it when you head west into the canyon out of Cimarron. The sill is made of Monzonite, which is on the continuum between syenite (very light in color) and diorite (medium in color) and has plagioclase and orthoclase feldspars in approximately equal amounts. In short, it is a lighter than granite, but generally similar.

My favorite aspect of this imposing formation is that the joint systems are at nearly right angles, which leaves enormous faces and a ragged, blocky crest at the skyline. And, of course, lots of rubble along the stream below. Here are some images of the crestline.DSC07299.jpeg

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Letting Go

After 33 years of collecting moths in the Pikes Peak Region, I finally have begun to let it go to the C. P. Gillette Museum in Fort Collins at Colorado State University. The first installment, 36 drawers of mostly Noctuidae (the owlet moths) were shrink-wrapped and dispatched on August 29. One drawer is shown here.9.jpg

And here is the first load.IMG_2410.jpg

And in their new home.Screen Shot 2018-09-01 at 10.46.16 AM.png

Many more to go in the next few weeks. Sad to see them go, but I know that they’re in a better place. (!)