ENVIRONMENTAL CONSEQUENCES in rocky mountain coniferous ...

Table 9 shows feeding time in the lower shelterwood unit subtreatments. Only
Hairy Woodpeckers fed in the most intensely utilized unit ("near complete").
Yellow-bellied Sapsuckers fed most heavily in "intensive log" and "intensive tree"
subtreatments because of paper birch left within those units. The birch were used
as both nest and feeding sites.
TABLE 9. Number of minutes woodpecker species were observed feeding in subunits of
different intensities of wood fiber utilization in low elevation shelter-
wood cutting unit.
Lower She1 terwood
Ye1 1 ow-be1 1 ied Sapsucker 3 9 105 70 0 21 4
Pi 1 eated Woodpecker 85 32 3 0 120
Common Fl i cker 6 2 5 0 0 31
Hairy Woodpecker 0 0 0 3 3
Total s 130 165 73 3 368
1979 CENSUS
Although this study focused on cavity nesters, a series of all-species censuses
was conducted using 1 ine transects. This was done in 1979, 5 years after logging,
to provide a general picture of species, density, and diversity differences in the
cut and uncut units.
Numbers of birds per 100 acres (40 ha) represent averages for 16 censuses
(table 10). Bird species diversity was consistently higher in the uncut or shelter-
wood units than in the clearcuts (fig. 13). A comparison of bird species diversity
and volume of woody material remaining after logging exhibited an anomaly in the
group selection - small clearcut/regular clearcut relationship (table 11 ). The
higher diversity in the group selection cuts, in spite of a lower volume of woody
material, probably was related to the very small size of the group selection cuts
and edge effects. In the CEF study site in general, MacGillivrayls Warbler,
Swainson's Thrush and Dark-eyed Junco -were the most common species. Red-breasted
Nuthatch and Mountain Chickadee were the most common cavity nesters,