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White Admiral Butterfly --only one was found during our survey |
Every year during the last week of June, a couple of us locals participate
in the Annual Butterfly Count. This nationwide survey (plus Canada and Mexico)
is sponsored by the North American Butterfly Association. The Butterfly Count
is patterned off of the National Audubon Society’s Christmas Bird Count which
takes place annually in mid December. In fact the 15 mile diameter count circle that we use for the Butterfly Count
is precisely the same one that we use for our local Christmas Bird Count.
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15 Silver-spotted Skippers were seen on the day of the butterfly count |
The objective of the Butterfly Count is to spend a day counting
every butterfly that we see in an assigned area within the count circle. We
note each species and number of individuals found. We also keep track of our time in
the field and how many miles we cover while counting. All of the collected
information will go into a database that will help conservationists understand
more about the health of butterfly populations and their species' distribution
throughout the continent.
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2 Dun Skipper were located during the count |
Unlike the bird Count, the butterfly count’s exact date is not
selected far in advance. Inclusive are any dates in June or July. The Count is
generally known as the 4
th of July Butterfly Count since most of the
leaders that run the individual counts choose a date near the July 4
th holiday.
Our own count has traditionally been run in the last week of June.
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14 Great Spangled Fritillary were seen -most were at the nature preserve |
For the day to be productive we need to pick a warm, relatively
cloudless and windless day –all conditions favorable for the maximum butterfly
activity. Normally the count day is selected just a few days ahead of time so
that the weather forecast is more accurate. The truth is if you choose a cold
rainy day, you might as well stay home, because no butterflies will be flying.
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The Hickory Hairstreak - 3 were found at the nature preserve |
My counting territory is largely restricted to our nature
preserve, while the count leader takes his own well-established route that samples a
larger part of the good butterfly habitat in our count circle. The leader and
founder of our count is Ernest Williams, a Hamilton College Professor and
nationally known butterfly expert.
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A Striped Hairstreak Butterfly drinks from Milkweed flowers |
On Thursday, I found 28 butterfly species at the nature
preserve and a total of 223 individuals. We collectively found a total of 591
butterflies representing 32 differnt species. The most common species was the
Cabbage White–a nonnative. The Cabbage White almost always attains the 1
st
or second most common status on our count, and I suspect on many other counts conducted throughout the country.
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15 Baltimore Checkerspot Butterflies were located -all in wet meadows |
Not nearly so common, the Baltimore Checkerspot, one of
my all-time favorite butterfly species, was located in our nature preserve’s boggy wetland. The wetland is populated by the plant called turtlehead, which
is the Checkerspot’s main food plant. There I found only one adult, but Ernest
located 15 checkerspots in a wetland a few miles to the north. This species had become hard to come by for the last several years, so we were pleased to see that they finally seem to be having a good year.
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19 Monarch Butterflies were found -this male is feeding on Milkweed |
In a normal year, the Milkweed Plants are just beginning to bloom during the
last week of June, but this year the blooms of milkweed, as well as many other
field plants, were much more advanced. This meant that there were a lot more
flowers than usual to check for butterfly visitors.
Monarch Butterflies were well represented at the nature preserve this year.
Most were found in meadows filled with their hostplants (Common Milkweed) and some were seen laying eggs on those plants. In
early successional fields where young willow seedlings are common, the
Monarch’s smaller lookalike, the Viceroy Butterfly, was found. No surprise, the
Viceroy’s foodplants are trees in the willow family.
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16 Questionmark Butterflies were seen during the count |
Acadian Hairstreak Butterflies
also lay their eggs on Willow, but this year I found none of that species anywhere at the
preserve. However, during the course of the morning, I did find 3 other species
of hairstreak butterfly, including the Hickory Hairstreak, Banded Hairstreak
and Striped Hairstreak.
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10 Eyed Brown Butterflies found in our boggy wetland |
Restricted to the habitat of our boggy meadow was a decent sized population of
Eyed Brown butterflies –these guys turned out to be the only representatives of
their species found on our count. The caterpillars of Eyed Brown
Butterflies feed on sedges, which grow plentiful in that particular wetland.
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9 Red Admiral were found during our count, but I expect more to emerge any day now |
The Red Admirals that were so plentiful earlier in the early spring were
found only in small numbers by both of our teams in the field. I suspect the
numbers of this species will be increasing any day now, as the progeny of those
original migrants begin emerging from their chrysalises, which are no doubt
hidden away in wooded recesses throughout the region.
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