The 2002 MAPS season was finished August 2 on the Carson River. It was an interesting first year of what is planned to be a five (or more) year project.
As it did last year the Carson River stopped flowing at the Delta site and cattle invaded the station. Monies to fence this area have been approved but not received.
The Dayton State Park oxbow became stagnant and the river diminished to a trickle. At Ambrose the river was very low but still flowing. We saw and heard active beaver each banding period there except the last. Wild horses use the Ambrose area regularly.
The totals for the first CARR year at Dayton State Park (DAYT), Ambrose Nature Study Area (ANSA), and the Lahontan Reservoir delta (DELT) are:
New captures - 909
Recaptures - 207
Unbanded - 51
Total captures - 1167
DAYT had a total of 348 captures (269 new, 60 recaps, and 19 unbanded),
ANSA had a total of 414 captures (349 new, 48 recaps, and 17 unbanded), and
DELT had 405 captures (291 new, 99 recaps, and 15 unbanded).
41 species were banded .
3 species unbanded...California Quail, Rufous and Black-chinned Hummingbirds.
Top 5 species:
1. Bewick's Wren - 197
2. House Wren - 194
3. House Finch - 103
4. Wilson's Warbler - 77
5. Bullock's Oriole - 58
Each station had 480 net hours for a total of 1440 net hours for the CARR. Captures averaged 0.81 birds per net hour for the CARR . ANSA averaged 0.86, DELT 0.84 and DAYT 0.73.
Each station represents a somewhat different habitat and flow regime. The birds that are were not present are as interesting as those that are. If we subtract an early surge of migrating Wilson's Warblers at Dayton and a late influx of House Finches at Ambrose, the Delta with its significant understory supported the most breeding birds. A Yellow-billed Cuckoo was possibly heard on two occasions but never seen at the Delta site.
Many questions arise:
Why if the cavity nesting wrens do so well are there so few Western Bluebirds?
Why are the cattle preferentially eating willow?
Can we compare the cattle impact at the Delta with the feral horse impact at Ambrose?
What restoration would benefit the few warblers, vireos, and flycatchers we band?
What is the effect of the ever expanding Tall Whitetop?
Comparisons with the two Truckee River stations will be interesting.
In addition, Nevada Bird Monitoring Program censuses were carried out up and down the river at each site by Jim Lytle.
We plan to attempt some fall banding.
Jim Eidel, Jim Lytle, Bill and Beth Clark