• Rainbow over Half Dome

    Yosemite

    National Park California

Bird Monitoring and Research: July 10-16, 2012

July 26, 2012 Posted by: Yosemite Bird Researchers and BW - Mather District Volunteer Interpretive Ranger

Birds are beginning to fledge at the middle elevations of Yosemite and most of the birds caught at Hodgdon Meadow and Crane Flat had recently hatched. This included twelve Anna's Hummingbirds and many Nashville Warblers and Orange-crowned Warblers. The meadows at higher elevations should begin to increase in activity soon. 

Interesting birds seen this period included the Oak Titmouse, Chestnut-backed Chickadee, Black-throated Gray Flycatcher, and a Mountain Quail. These birds are rarely found in the researchers' nets. The most fascinating bird was the Northern Flicker (Intergrade). There are two color forms of the Northern Flicker, the "Yellow-shafted" of east of the Rocky Mountains and the "Red-shafted" of west of the Rockies. The most obvious difference is the flight feathers (wings and tail): Yellow-shafted have yellow shafts and undersides to these feathers, while the Red-shafted have red. A stable hybrid zone extends along the east slope of the Rockies from southern Alaska to the Texas panhandle. Here, these two forms freely interbreed. Resulting offspring can show a wide variety of traits, including a number of combinations of traits of either or both parents. Occasionally, one of these intergrades wanders out of that range and we were lucky to get to observe this one up close. 

List of species recorded from July 10-16:

GAMEBIRDS   
Mountain Quail (Oreortyx pictus)

WOODPECKERS   
Red-breasted Sapsucker (Sphyrapicus ruber)
Williamson's Sapsucker (Sphyrapicus thyroideus)
Northern Flicker (Intergrade) (Colaptes auratus)

FLYCATCHERS   
Dusky Flycatcher (Empidonax oberholseri)
Hammond's Flycatcher (Empidonax hammondii)
Pacific-slope Flycatcher (Empidonax difficilis)

VIREOS   
Cassin's Vireo (Vireo cassinii)

WRENS   
House Wren (Troglodytes aedon)

WARBLERS   
Black-throated Gray Warbler (Dendroica nigrescens)
Hermit Warbler (Dendroica occidentalis)
MacGillivray's Warbler (Oporornis tolmiei)
Nashville Warbler (Vermivora ruficapilla)
Orange-crowned Warbler (Vermivora celata)
Yellow-rumped Warbler (Audubon's) (Dendroica coronate)

SPARROWS   
Dark-eyed Junco (Oregon) (Junco hyemalis)
Fox Sparrow (Passerella iliaca)
Lincoln's Sparrow (Melospiza lincolnii)
Song Sparrow (Melospiza melodia)

FINCHES   
Purple Finch (Carpodacus purpureus)

OTHER BIRDS   
Anna's Hummingbird (Calypte anna)
Chestnut-backed Chickadee (Poecile gambeli)
Oak Titmouse (Baeolophus inornatus)
Bushtit (Psaltriparus minimus)
Red-breasted Nuthatch (Sitta Canadensis)
Brown Creeper (Certhia Americana)
Golden-crowned Kinglet (Regulus satrapa)
Lazuli Bunting (Passerina amoena)


Table 1. Birds Processed for the Period July 10 - July 16, 2012

 Station  New Bands
  Recaptures
Big Meadow
48 3
Hodgdon (upper)
49 13
Hodgdon (lower)
71 20
Crane Flat
53 11
Gin Flat
40 7
White Wolf
12 8
Total Recorded 274 62

Table 2. Previous Year Comparison (number of birds processed)
for the past month (June 20 - July 16)

 Station  2011
  2012
Big Meadow
113 133
Hodgdon (upper)
125 238
Hodgdon (lower)
120 176
Crane Flat
161 197
Gin Flat
81 118
White Wolf
71 77

birds




Post A Comment

Submit Comment

Did You Know?

Upper Yosemite Fall with spring runoff

Yosemite Falls is fed mostly by snowmelt. Peak flow usually happens in late May, but by August, Yosemite Falls is often dry. It begins flowing again a few months later, after winter snows arrive.