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Return to RPBO Sightings and News |
Date submitted: Friday, December 28 at 01:34 PM
Name: Rod Mitchell
News Article:
Visit of Saturday December 22nd/ 2001
David and I took about two and half hours to do another of our
winter counts. You can use the link above to visit the Sightings
Board and read about what we saw. I just wanted you all to know
we looked into both trailers and found them dry and fresh smelling.
The new vents are doing their job admirally. There was no other
damage nor any trees or large branches down in our camp area or
in any of our net lanes.
We will not be back until January the 5th. Watch for reports then
and the best of the season to you in the meantime.
RPBO Migration Summary VIII
For the period: September 17th September 24th.
The week started off on a busy note, with a good number and variety of sparrows encountered in the area on the morning of the 17th. A total of thirty sparrows were banded, including 9 Golden-crowned (Estimated Total/15), 7 Lincolns (ET/13), 5 Song (ET/12), and four each of Savannah and Fox (ET/9 & 11). Orange-crowned and Yellow Warblers were about as well, with 7 and 5 handled respectively. All told, 57 birds of sixteen species were banded and 65 species were recorded in the count area. It was also active on the 18th, with 60 banded of fifteen species. Ruby-crowned Kinglets were more in evidence, with 9 individuals banded on the day, along with a similar number of warbler and sparrow species as on the 17th. Hermit Thrush were more numerous on the 18th, with 7 banded (ET/9). Two Red-breasted Sapsuckers in the area made for a nice surprise, and were among the 65 different species observed on the day.
A similar variety of species continued to move through the area during the following days, even as the weather turned from overcast, windy and dry conditions earlier in the week to overcast, calm and rainy conditions by the morning of September 21st. Although the rain cleared up the following day, there were fewer birds in the area on the 22nd & 23rd, yet no less so in terms of species diversity. On this note, the following table presents the totals for all birds banded during the current summary period, with the number of individuals banded during the previous period indicated in parentheses. The totals offer some indication of the variety and abundance of species in the area during this time, as well as a comparison of the relative number of birds for each species from one week to the next.
Birds banded by species and date for the period Sept 17th
24th,
with totals from previous summary period (Sept 9th-16th)
in parentheses.
Date September |
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Species | |||||||||
Sharp-sh. Hawk |
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2 |
||||||
Coopers Hawk | (1) | ||||||||
Huttons Vireo |
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1 |
|||||||
Stellers Jay |
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2 |
||||||
Willow Flycatcher | (1) | ||||||||
Hammonds Flycatcher |
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(1) 5 |
|||||
Pacific-slope Fly. |
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(8) 5 |
|||
Chestnut-backed Ch. |
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(5) 7 |
|||||
CommonBushtit |
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(1) 1 |
|||||||
Reb-br. Nuthatch |
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2 |
||||||
Brown Creeper | (1) | ||||||||
Bewicks Wren | (2) | ||||||||
Winter Wren |
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(11) 30 |
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Marsh Wren |
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1 |
|||||||
Golden-cr. Kinglet |
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(3) 22 |
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Ruby-crowned Kinglet |
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(1) 45 |
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Swainsons Thrush |
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(1) 4 |
||||
Hermit Thrush |
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(3) 18 |
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American Robin |
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1 |
|||||||
Orange-cr. Warbler |
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(16) 20 |
||||
Yellow Warbler |
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(19) 11 |
||||
Audubons Warbler |
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1 |
|||||||
MacGillivrays War. |
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1 |
|||||||
Common Yellowthroat |
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(9) 9 |
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Wilsons Warbler |
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(3) 3 |
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Spotted Towhee |
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(12) 12 |
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Savannah Sparrow |
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(29) 4 |
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Fox Sparrow |
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(12) 23 |
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Song Sparrow |
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(20) 9 |
||||
Lincolns Sparrow |
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(25) 20 |
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White-cr. Sparrow |
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(1) 1 |
|||||||
White-thr. Sparrow |
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1 |
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Golden-cr. Sparrow |
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(2) 18 |
||||
Purple Finch |
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(1) 1 |
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American Goldfinch | (6) | ||||||||
Total Banded |
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(194)293 |
Total species |
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(26) 29 |
Bearing in mind the increased number of net hours during this summary period (see table below), the comparison above clearly indicates there was more bird activity in the third week of September then during the previous week, and that this trend was due mostly to an influx of late-migrants, particularly Ruby-crowned Kinglets. The captures per 10 net hours for this period (6.3) verses the previous summary period (4.7), further supports this suggestion.
Season banding totals to date, 2001.
Period | Banded | Net Hours | Birds/10 Net Hours |
Jul 23-Jul 30 |
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Jul 31-Aug 7 |
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5.7 |
Aug 8-Aug 15 |
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Aug 16-Aug 23 |
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Aug 24-Aug 31 |
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Sep 1-Sep 8 |
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Sep 9-Sep 16 |
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Sep 17-Sep 24 |
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Total - 2001 |
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The first Broad-winged Hawk of the fall was observed on September 19th, but it wasnt until the 22nd that raptors began to arrive in good numbers, with a season high ET of 250 Turkey Vultures and 14 Red-tailed Hawks, as well as good numbers of accipiters and falcons. The vulture numbers increased to 310 birds the following day and then, on September 24th, the migration crew was treated to a good showing of buteos, with 17 Red-tailed and a season high 7 Broad-winged Hawks observed. All told, there were 10 raptor species recorded on the 24th.
In addition to the sapsuckers mentioned earlier, there were a variety of other interesting and unusual species observed on the Point during the week, including a single Wood Duck on the 21st, a Townsends Solitaire and 3 Sandhill Crane on the 22nd, the seasons first two Little Gulls on the 23rd, and a single White-throated Sparrow banded on September 24th.
A summary for the period September 25th October 2nd will be posted shortly.
RPBO Migration Summary VII
For the period: September 9th September 16th.
Migration activity on the Point during the period of September 9th to September 16th was noticeably quieter than the previous week. The weather conditions were warm, clear and calm, which was also a change from last week, when things were generally unsettled, overcast and windy. It seems the fine weather did little to prompt migrants during this count period, and the census area remained relatively quiet right up to the 16th. Its probably no coincidence that an increase in bird numbers on the 16th coincided with the development of some frontal activity on that same day, with increased winds and overcast skies returning to the area.
Of the birds that were on hand, sparrows were by far the most numerous, with lots of Savannahs and Lincolns observed and banded, followed closely by increasing numbers of Spotted Towhee, Fox and Song Sparrows. The seasons first banded Golden-crowned Sparrow was handled on the 11th and, on that same day, the seasons first White-throated Sparrow was observed as well. Its clear that sparrows dominated throughout the week when one considers the banding totals for the period of the 194 birds banded, 99 were sparrows. The table below outlines all the birds banded during this period, by species and date.
Birds banded by species and date, for the period Sept 9th 16th.
Date September | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | Total |
Species | |||||||||
Coopers Hawk |
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1 |
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Willow Flycatcher |
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1 |
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Hammonds Flycatcher |
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1 |
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Pacific-slope Flycatcher |
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8 |
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Chestnut-backed Chickadee |
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5 |
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Bushtit |
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1 |
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Brown Creeper |
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1 |
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Bewicks Wren |
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2 |
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Winter Wren |
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11 |
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Golden-crowned Kinglet |
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3 |
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Ruby-crowned Kinglet |
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1 |
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Swainsons Thrush |
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1 |
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Hermit Thrush |
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3 |
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Orange-crowned Warbler |
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16 |
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Yellow Warbler |
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19 |
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Common Yellowthroat |
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9 |
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Wilsons Warbler |
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3 |
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Spotted Towhee |
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12 |
||||
Savannah Sparrow |
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29 |
|||
Fox Sparrow |
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12 |
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Song Sparrow |
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20 |
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Lincolns Sparrow |
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25 |
||
White-crowned Sparrow |
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1 |
|||||||
Golden-crowned Sparrow |
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2 |
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Purple Finch |
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1 |
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American Goldfinch |
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|
6 |
||||||
Total species |
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26 |
Total banded |
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|
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|
|
194 |
No migration monitoring took place on September 12th and 13th. The field station was "off-limits" during this time as a result of the tragic events which occurred in New York and Washington. The military base was closed to all non-military personnel, and there was no coverage whatsoever on these two days for the first time this season. Official coverage resumed on the 14th.
The final three days of the coverage period did see the arrival of small numbers of Yellow-rumped Warblers, more American Robins and Pipits, as well as Ruby-crowned Kinglets and Hermit Thrush. The first Varied Thrush of the fall was heard on the 16th. In this respect, the composition of species moving through the area was noticeably shifting, at this point, with groups like the hummingbirds, swallows, nighthawks (and most flycatchers) having run their course completely, and the late-migrants now beginning to increase in number.
Season banding totals to date, 2001.
Period | Banded | Net Hours | Birds/10 Net Hours |
Jul 23-Jul 30 |
|
|
|
Jul 31-Aug 7 |
|
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5.7 |
Aug 8-Aug 15 |
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|
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Aug 16-Aug 23 |
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Aug 24-Aug 31 |
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|
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Sep 1-Sep 8 |
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Sep 9-Sep 16 |
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|
|
Total 2001 |
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|
There was also an increase in waterbird activity, with sizable numbers of gulls and alcids (mostly Herrmanns Gulls and Common Murres) on hand each day, as well as a greater variety of waterfowl, including ones and twos of Northern Pintail, Green-winged Teal, as well as Common, Hooded and Red-breasted Merganser. Four Common and two Pacific Loons were observed on September 16th, along with 3 Surf Scoters. Turkey Vulture numbers were up to 62 on September 15th but, otherwise, there was still not a great deal of raptor activity in the area.
RPBO Migration Summary VI
For the period: September 1st September 8th.
The first week of September turned out to be the most active period to date for migrants at Rocky Point this fall. A good variety and number of birds were observed in the field, and it was by far the busiest week of banding, as indicated in the table below. Although the general lull in activity during the last week of August carried over to the first day of September, with little migration taking place and only five birds banded, all this would change on the morning of the 2nd, when the station experienced its first good "fallout" of birds this year. Pacific-slope Flycatchers made a fine showing, with an Estimated Total (ET) of 57 on the day, with 32 individuals banded. Other species encountered in good numbers included Orange-crowned (ET 30/B 14), Wilsons (24/13) and Yellow Warbler (12/11), Winter Wren (32/9), and Hammonds Flycatcher (16/4). Lincolns and White-crowned Sparrows were also active, as well as Swainsons Thrush, with seven individuals banded. All told, 126 individuals were banded of 16 species, with 80 different species observed on the day.
Season banding totals to date, 2001.
Period | Banded | Net Hours | Birds/10 Net Hours |
Jul 23-Jul 30 |
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Jul 31-Aug 7 |
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5.7 |
Aug 8-Aug 15 |
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|
|
Aug 16-Aug 23 |
|
|
|
Aug 24-Aug 31 |
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|
|
Sep 1-Sep 8 |
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Total - 2001 |
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|
|
The 3rd of September was surprisingly quiet, yet things picked up again on the 4th and remained quite busy until the end of the summary period. September 4th-6th saw three days of scheduled military activity in the area, which meant the migration crew ended coverage early on these days. The daily census was conducted, but only two hours of observation and banding occurred, rather than the usual six hours. Even so, it was clear that there were lots of migrants in the area, with Winter Wren, Lincolns Sparrow, Orange-crowned Warbler and Swainsons Thrush most in evidence on all three days. As one indication, the banding totals on September 4th and 5th were 54 and 44 respectively, with less than 20 total net hours each day. By comparison, there were 78 net hours required to capture the 126 birds banded on September 2nd. This indicates that there was more bird activity as the week progressed, even though there were fewer birds banded due to the reduced coverage.
Full coverage resumed on September 7th. Though not as active as earlier in the week, there were still a fair number of songbirds in the area on the 7th and 8th, including a steady supply of Lincolns Sparrows and Winter Wrens, as well as smaller numbers of Swainsons Thrush, Orange-crowned Warbler and Savannah Sparrow. Pacific-slope and Hammonds Flycatchers were almost entirely absent after their strong showing on the 2nd, with only 21 Pacific-slope banded during the next six days (September 3rd-8th). In this respect, it seems, the first week of September saw the last good surge of some of the early to mid-season migrants, such as the flycatchers and most of the warblers, as well as seeing the initial arrival of some species considered to be mid-to-late fall migrants. This would include the increased number of sparrows observed and banded throughout the week, especially Lincoln and Savannah Sparrows, as well as some of the seasons first Fox Sparrows. At the same time, the station had yet to experience the vanguard of true late migrants like the Fox Sparrows, towhees, kinglets, Hermit Thrush, and Yellow-rumped Warbler.
Throughout the summary period there were a number of additional interesting bird observations at the station, including the following: 4 Black Swift on September 1st; a Red-throated Loon on the 2nd; a single Bairds Sandpiper on the 3rd; a stunning Northern Pygmy Owl banded and a Red-necked Grebe seen on the 5th; and an impressive 17 Sandhill Cranes observed on the 8th. Alcid and gull numbers were up and down during the period, but a good number of alcids were seen on September 7th, with an estimated total of 820 Rhinoceros Auklet and 215 Common Murre. Raptors were moving through in reasonable numbers for this time of year, with 11 Red-tailed Hawks observed on September 8th, along with 6 Sharp-shinned Hawks, 3 Coopers, and 50 Turkey Vultures.
A summary for the period September 9th to September 16th will be posted shortly.
RPBO Migration Summary V
For the period: August 24th-August 31st.
The last week in August proved to be a quiet time for songbirds on the Point, as the banding totals for the period indicate (see below), and which was also apparent from the lack of bird activity observed in the field. The weather conditions were dry, with some overcast days but no precipitation. It was very calm early in the week, though the wind did pick up from the west towards the end of the month. These stable, warm conditions, and a lack of any frontal activity, seemed to create a static effect for bird activity in the census area.
The 24th and 25th of August remained quiet after the rain of the preceding days, with a number of Vauxs Swift and a small increase in Swainsons Thrush being the only bird news of note. Warblers, flycatchers and such were mostly absent until a moderate number of Pacific-slope (9 Banded/17 ET) and Willow (3 B/5 ET) Flycatchers, along with a few Wilsons Warblers (7 B/12 ET) arrived on the 27th. The 26th was somewhat more active for Coopers and Sharp-shinned Hawks, and the seasons first American Pipit was recorded on this date. An increase in sparrow activity was noticeable on August 28th, with 75 White-crowned, 10 Savannah and a couple of Lincolns Sparrows ETd on the day, as well as the seasons first Fox Sparrow.
Although the final days of the month remained very slow for landbirds (3.8 birds banded per 10 net hours, as compared to the season average of 5.1), there were many shorebirds in the area, as well as good numbers of gulls and alcids. Eleven shorebird species were observed on Aug 29th alone, including a Wandering Tattler, a Bairds Sandpiper, Semipalmated Sandpipers, and a nice variety of other waders. This may represent the highest number of shorebird species recorded in one day at Rocky Point. Gulls and alcids were most numerous on the 31st, with +300 Rhinoceros Auklet and 250 Common Murre observed, along with 600 Heermanns, 400 Glaucous-winged and 350 California Gulls.
Season banding totals to date, 2001.
Period | Banded | Net Hours | Birds/10 Net Hours |
Jul 23-Jul 30 |
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Jul 31-Aug 7 |
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Aug 8-Aug 15 |
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Aug 16-Aug 23 |
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Aug 24-Aug 31 |
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Total - 2001 |
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Total - 2000 |
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In returning to the wren family, and the status of individual wrens recaptured this fall (a subject of discussion in the previous summary), the table below presents information for all Bewicks and Winter Wrens recaptured for the period July 23rd to August 31st, 2001.
Bewicks and Winter Wren recaptures for the period
Jul 23 Aug 31, 2001.
SPECIES | ORIGINALLY BANDED |
RECAPTURED | DAYS BETWEEN BANDING + RECAP. |
Bewicks Wren |
Jul 20, 2000 |
Aug 14, 2001 |
1 YR + 25 |
Winter Wren |
Jul 21, 2000 |
Aug 19, 2001 |
1 YR + 29 |
Bewicks Wren |
Jul 26, 2000 |
Aug 5, 2001 |
1 YR + 10 |
Winter Wren |
Jul 23, 2001 |
Aug 25, 2001 |
33 |
Bewicks Wren |
Jul 23, 2001 |
Jul 24, 2001 |
1 |
Aug 5, 2001 |
13 |
||
Aug 11, 2001 |
19 |
||
Winter Wren |
Jul 25, 2001 |
Aug 19, 2001 |
25 |
Winter Wren |
Jul 26, 2001 |
Aug 9, 2001 |
14 |
Bewicks Wren |
Jul 26, 2001 |
Aug 10, 2001 |
15 |
Aug 13, 2001 |
18 |
||
Bewicks Wren |
Aug 11, 2001 |
Aug 17, 2001 |
6 |
Winter Wren |
Aug 14, 2001 |
Aug 30, 2001 |
16 |
Winter Wren |
Aug 19, 2001 |
Aug 20, 2001 |
1 |
11 Individuals | 14 Recaptures | ||
6 Winter Wren | |||
5 Bewicks Wren | |||
Total number of Bewicks Wrens banded during this period: 43
Total number of Winter Wrens banded during this period: 78
121 wrens banded for the period Jul 23-Aug 31
11 individuals recaptured on 14 occasions
Though it remains surprising that so few birds have been recaptured out of the 121 wrens banded, the details above do appear to state a good case for the suggestion that the migration crew encountered a number of local resident breeding birds and young in late July, which accounts in part for the higher banding totals during this period as compared to the first week in August. The adult birds (2 Bewicks and one Winter) originally banded in 2000 are most likely local breeders. Furthermore, the fact that eight of these eleven birds were originally banded in late July, and that many of them were recaptured in the area upwards of one month from their original banding date, also supports the idea that these are young local birds. And finally, out of 48 Bewicks and Winter Wrens banded after August 1st, only three of these birds have been recaptured, which indicates that they have been actively moving through rather than remaining in the area for any length of time.
In conclusion, a closer look at the banding and recapture data for Bewicks and Winter Wrens this year seems to support the idea that the higher banding totals during the first week of operation was at least in part due to the presence of local family groups in the banding area. The lull in wren numbers during the second week, followed by a substantial increase in numbers during week 3 and 4, also reinforces this suggestion, as does the fact that very few of these later wrens have been recaptured. It seems these later birds have been actively moving through the area. The question remains perhaps: Why were the birds from July not recaptured more often if they were in the area during the entire time (for example, the Winter Wren that was recaptured 33 days after being banded)? The short answer might be (though based mostly on anecdote) that these local birds werent recaptured frequently because many resident songbirds are good at avoiding mistnets set up in their immediate territory or living area. On this final note, its interesting that of the fourteen recaptures recorded in the table above, on only one occasion was an individual bird recaptured in a mistnet that it had been captured in before.
RPBO Migration Summary IV
For the period: August 7 - August 15th (Conclusion)
In final summary, the period August 7 - 15th (RPBO
Migration Summary III) saw the departure of the last resident
breeding birds from the area (for the most part), as well as a
continued decrease in swallow and hummingbird numbers. At the
same time, there was a noticeable increase in the variety and
abundance of other species observed and banded compared to the
previous two weeks (see last summary for details). Included in
this trend were a number of interesting sightings, including a
Dusky Flycatcher, 2 Sandhill Crane, 2 Great Egret, and 5 Black
Scoter seen on August 11th, and a Black-legged Kittiwake,
Short-eared Owl, and Sanderling observed on the 12th.
Correction: RPBO Migration Summary III A total of 257 birds were banded during the period July 31st-August 7th and not 157, as originally indicated in the previous posting.
For the period: August 16th August 23rd
The weather played a more prominent role during this coverage period (Aug16-23) as compared to the previous weeks of migration monitoring at the Point. Moderate to strong west winds affected the banding effort on the 16th and 17th (a number of nets were closed as a result of the high winds), and no banding was conducted on the 22nd and 23rd due to persistent and sometimes heavy rain showers. Despite this, the bird activity was similar to the previous period, with a good variety of species encountered in small numbers through-out the week. Six warbler species were observed in the "count area" on August 16th, for instance, and then seven species from this family were seen on the the18th and 19th, along with five flycatcher species on the 19th.. Sparrow numbers fluctuated somewhat, with White-crowned and Chipping Sparrows seen in groups of up to twenty and thirty birds on a number of days, along with moderate numbers of Song Sparrows, a few Savannahs, as well as the falls first Lincolns Sparrow on the 18th .
The busiest day of songbird activity was on August 19th, with a good number of birds banded and observed first thing in the morning. Pacific-slope Flycatchers were active, with an Estimated Total (ET) of 25 individuals recorded (13 banded), along with a good variety of warblers. All told, the migration crew banded seven different warbler species, including 8 Orange-crowned (ET 17), 4 Yellow (ET 8), 2 Black-throated Gray (ET 3), 5 Wilsons (ET 10) as well as one each of Townsends and MacGillivrays Warbler and Common Yellowthroat. In all, a total of 74 individuals of 20 different species were banded/handled, and 81 species in total were observed in the area during the day.
In looking at the banding totals to date, another interesting trend - this time relating to the wrens is evident from the numbers of birds banded from this particular family. A quick tally shows that a total of 34 wrens were banded during the first eight days of coverage this fall (July 23rd- 30th), whereas only eight were banded during the second period (July 31st-August 7th). Since this lull, however, the totals have jumped back up again, with 29 wrens banded between August 8th-15th and an additional 24 banded during the most recent period (August 16th-23rd). The following table shows the number of individuals of each species banded during each separate coverage period:
Number of individuals banded and recaptured by species and date.
Species |
|
|
|
|
|
Bewicks Wren |
|
|
|
|
|
House Wren |
|
|
|
|
|
Winter Wren |
|
|
|
|
|
Marsh Wren |
|
|
|
|
|
Total |
|
|
|
|
|
Birds/10 Net Hours |
|
|
|
|
|
* Recaptured birds in parentheses
These totals lend support to the suggestion (discussed in earlier summaries) that during the first week of coverage we were encountering mostly resident breeding birds and dispersed young in the area. It seems reasonable to speculate that the monitoring crew was banding mostly local breeding adults and their young initially and that, likely, after the brief period of reduced activity during the second week of operations, we are now encountering more active migrants in the area at an increased rate. This same possibility applies for the majority of other resident songbirds (flycatchers, vireos, warblers, etc.) but the banding totals for the wrens seem to offer a good illustration.
At the same time, however, the numbers of wrens that have been recaptured during the season (number in parentheses) doesnt support this suggestion terribly well - at least not in the case of the Winter Wren, though perhaps more-so with the Bewicks Wren. Recaptures are birds that are caught again after they have already been banded. As is most often the case, almost all the wren recaptures at the station this fall have been of birds that were first captured and banded during this field season at this location (with the exception of two or three Bewicks Wrens that were banded at RPBO last fall). But with this in mind, it seems unlikely, for instance, that only four Winter Wrens would have been recaptured out of a total of 40 birds banded this year if there were many resident adults and/or young remaining in the area for any length of time. Or that almost 25 Winter Wrens would be banded before there was one recapture. These low recapture rates are more typical of circumstances when birds are moving fairly actively through an area rather than just lingering. A closer look at which particular wrens have been recaptured may shed some additional light on the subject, which well follow up on in the next summary.
In closing, here are the updated (and corrected) banding totals for the season:
Period | Banded | Net Hours | Birds/10 Net Hours |
Jul 23-Jul 30 |
|
|
|
Jul 31-Aug 7 |
|
|
|
Aug 8-Aug 15 |
|
|
|
Aug 16-Aug 23 |
|
|
|
Total |
|
|
|
A summary for the period August 24th 31st will be posted shortly.
Species |
|
|
Pacific-slope Flycatcher |
|
|
Orange-crowned Warbler |
|
|
Wilsons Warbler |
|
|
Total |
|
|
Total per 10 net hours |
|
|
Pacific-slope Flycatcher |
|
|
Orange-crowned Warbler |
|
|
Wilsons Warbler |
|
|
Total |
|
|
Total per 10 net hours |
|
|
Pacific-slope Flycatcher |
|
|
Orange-crowned Warbler |
|
|
Wilsons Warbler |
|
|
Total |
|
|
Total per 10 net hours |
|
Despite the lower number of these familiar faces, however,the migration/banding crew still managed to keep fairly busy duringthis period, as indicated by the overall number of birds banded:
Period |
|
|
|
Jul 23 - Jul 30 |
|
|
|
Jul 31 - Aug 7 |
|
|
|
Aug 8 - Aug 15 |
|
|
|
Copyright 2006, Rocky Point Bird Observatory.