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.

Poems and Songs

A couple of new poems and songs from June and July 2020, courtesy of Covid-19.

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Good old Theme 122:

And Theme 123: This one actually makes me laugh in the middle.

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…