15 June 2011

Pursuing the "Karner Blue" butterfly

In between my other, more prosaic, duties this past week, I found time for a field trip to find and photograph the Karner Blue.  I wrote a blog post about the butterfly a little over a year ago -

The "Karner" Blue (Plebejus melissa samuelis) is one of the butterflies described and named by Vladimir Nabokov.
The Karner Blue is a small butterfly with an average wingspan of 25 mm. The males are an iridescent violet blue, the females are gray brown often glossed with blue, with a submarginal band of bright orange chevrons to which melissa owes its common name, Orange-margined Blue. The adults live only four or five days. They come in two broods, with adult flights in late May to early June and late July to early August at Karner and throughout the range, settling on moist sandy ground, drinking at puddles and sipping the nectar of Pine Bush flowers. When the Karner Blue was still abundant, it flew in large flocks of hundreds or thousands. The only foodplant its caterpillars feed on is wild blue lupine (Lupinus perennis L.). This makes it a highly specialized insect, vulnerable to changes in the ecosystem that affect the wild lupine.
It's interesting, and perhaps counterintuitive, that some of the best places to seek butterflies are not particularly "scenic" to a human eye.  I took the upper photo from the top of a hill overlooking Reed Lake at the Crex Meadows Wildlife Area in northwestern Wisconsin.  The surrounding countryside appears rather bleak, but it has one crucial feature - an abundance of lupine:
Lupine grows well in sandy, poor soils, and is quite at home in pine barrens and oak savannahs, and it is the sole food plant for the caterpillars of the Karner Blues.

When I got to Crex Meadows, the DNR staff reported that this year an abundance of Karner Blues had appeared, so I was hopeful of finally getting a good photo of this somewhat elusive butterfly on the Endangered Species list. Karner Blues show a sexual dimorphism in their color patterns, the males having beautiful cerulean sky-blue color to the wings on the upper surface.  The hard part is capturing that in an image, because they tend to rest with their wings upright:
This fellow gave me glimpses of his blue, but flew away as I tried to get closer.   This other one was "puddling" for minerals at a sandy area, and let me hover above him, but I couldn't time the shutter to capture his wings flattened out.

Shortly thereafter I saw a blue with specks of gold on the upper wing surface - the pattern of the female.  This one led me on a merry chase, but finally let me hover above her for her portrait.
(click image for wallpaper size)  The camera autofocused on her thorax and antennae, and since the wings were a bit out of the plane and I had a limited depth of field, the wing tips are slightly out of focus, but you can see that she has been nipped on the wings once or twice during bird attacks, but managed to escape.

I'm hoping someday to locate eggs, caterpillars, and a chrysalis to photograph.

13 comments:

  1. Absolutely beautiful

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  2. Gorgeous little critters.

    I don't think that vista looks bleak at all, BTW. Lovely and very restful and spacious.

    --Swift Loris

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  3. Thanks for the very interesting post, and congratulations on the great photographs! I've learned quite a lot about butterflies (and so many other random things) from lurking on this blog for the last year or two. It's always interesting to hear people explaining their hobbies, particularly less-common ones such as butterfly watching.
    I'm a very amateur photographer, and I took my digital SLR to a butterfly center once. I can fully appreciate the challenge of capturing a butterfly in a certain pose but can't begin to fathom how difficult it must be when the subject is so tiny and so uncommon. It must have been quite an experience for you to not only find these butterflies but to capture some striking images of them as well.

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  4. I have to agree with Swift Loris that the landscape looks quite attractive to me. Of course, I've been spending too much time in cities recently.

    Lovely photos!

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  5. The butterflies are lovely. As for the countryside, it looks quite lush and green to someone living in the arid southwest.

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  6. What kind of camera are you using? Most DSLR's have a mode where they can snap anywhere from 3 to 8 images per second. Of course, the more expensive cameras is where you will find the higher numbers.

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  7. http://imgur.com/gallery/gHgxU

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  8. Looks like a Polyphemus moth - odd at that altitude, since they are not long-distance migrators.

    Context?

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  9. DubyaD, I have a Nikon Coolpix that will capture multiple images in Sport mode. It's still a challenge to catch the moment, but I should probably try that mode more often.

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  10. That's fabulous that you found this little beauty. We do butterfly counting at Riveredge Nature Center,Wi but I have yet to see one. Beautiful pics!

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  11. Riveredge looks like a great nature center; I'll keep it in mind if I get to the Milwaukee area.

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