Powdermill Bird Banding
Pictorial Highlights
Fall 2004
UPDATES for October 5 - 10
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Cold, frosty, frozen net mornings delayed opening almost
two hours many days this week, and with the weather these same days rather
quickly turning warm and sunny by late morning, it negatively impacted
banding totals. We banded only about half the number of birds caught
last week, although our banding effort this week was well more than half
of last week's effort. This week certainly marked the turning point
of the fall migration season with respect to diversity, the most speciose
day being just 28. Ruby-crowned Kinglet topped this week's
banding list, with 63 banded, followed by Black-capped Chickadee (47),
White-throated Sparrow and Song Sparrow (41 each), and Am. Goldfinch (33).
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Pam Ferkett, Trish Miller-Lanzone,
Annie Lindsay, Molly McDermott, and Matt Shumar all helped with
banding this week.
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We banded three new species this week, the first of these
on Wednesday, Oct. 6. Two
Brown Creepers entered our totals, both of unknown age and sex (molt limits
in this species are nearly indiscernible because they usually occur among
a small number of feathers in the lesser and median coverts and completely
pneumatized skulls are unreliable because young bird's skulls can be fully
ossified by this time of year.)
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Creepers are specially adapted for
their unique bark-gleaning foraging behavior. Because of this, just
about everything on a creeper, from its claws to its beak to its tail feathers,
is long, curved, and pointed. Creepers cling to the sides of
trees, spiralling up the trunk by gripping the bark with their long claws
and bracing against their stiff tail feathers. They use their slender,
down-curved and pointed bill to snatch small insects, spiders and their
egg masses from the tight nooks and crannies in the bark.
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The other two new species were banded on Friday,
October 8. This hatching year female
Dark-eyed Junco, was from our local breeding race, Junco hyemalis carolinensis,
based, among other things, on its bluish bill color.
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Also banded on this date was our first Orange-crowned
Warbler for the fall, an adult (AHY) male (sex based on the concealed orange
crown--slighty revealed for this picture--and its comparatively long wing
length of 59mm). Although we usually manage to catch a handful of
OCWA's in both the spring and fall, we sometimes "miss" banding them altogether,
so catching this species is always a highlight for us.
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Also banded on Friday was Lincoln's Sparrow no. 43 for
the season--a hatching year bird with partial albinism on one wing.
While we not infrequently see cases of partial albinism (lack of pigment
on parts of the body which typically result in wholly or partly white feathers
- this most likely caused by a genetic deficiency of the enzyme that produces
melanin), this one was very unusual because the albinism was not symmetrical.
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Compared with last year (which was
a particularly cool and wet breeding season for most birds), we have witnessed
far fewer bill and leg deformities this season. In fact, this Eastern
Phoebe, banded on Saturday, Oct. 9, with its
slightly crooked and hooked bill, was the first noticeable deformity we
have observed this season.
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As many bird watchers have observed,
this is an irruption (i.e., a periodic, but not necessarily annual, large
scale movement) year for chickadees. Pictured below is one of 17
chickadees banded on
Oct. 9, bringing our
fall total to 137 (that's a lot of sore fingers!)
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Over the course of 44 fall banding
seasons at Powdermill, there has been a handful of very heavy (>250 banded)
irruptions of BCCHs, and with much of the flight period for this species
yet to come, 2004 may end up being another one of these years. The
biggest flight ever recorded here was in fall 1983, when we banded 490
birds.
.
Although not strictly regular
in their pattern of occurrence, in the graph below it is evident that there
has been at least one heavy irruptive year in most of the three-year spans
since banding began in 1961 (>150 chickadees banded in 13 seasons).
Lighter movements (>100 birds) occurred in an additional six fall seasons,
suggesting that, on average, a noticeable southward movement in the Appalachians
by northern populations of BCCHs occurs every other year or so, a pattern
noted early on at Powdermill (Leberman. 1965. Recent recoveries
of chickadees. EBBA News 28:89-91). Our fall banding totals in non-flight
years generally are well below 50.
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On Sunday,
October 10, we netted our 10th Cape May Warbler
for the week and our 28th for the season. This handsome hatching
year male.
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We banded him just shortly before we ended the day (and
banding week for that matter) with a public banding demo at Powdermill
Nature Reserve's Nimick Nature Center. Guests of all ages enjoyed
a brisk autumn day in the Laurel Highlands and the chance to see some familiar,
and some unfamiliar, birds beak to nose, all while learning about the process
and importance of bird banding in monitoring and conserving bird populations.
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Last Updated on 10/13/04
By Adrienne J. Leppold and
Robert S. Mulvihill