Table 2. Stand type and physical characteristics of cavities considered suitable for the breeding of Barrow’s Goldeneyes (Bucephala islandica) found in 43 ha of linear transects located in unharvested (17.2 ha), remnant (5.8 ha), and harvested forests (20 ha) of balsam fir (Abies balsamea) and black spruce (Picea mariana) in the Chauvin and Martin-Valin controlled wildlife harvesting zones, Quebec, Canada, 2004–2005; “dbh” stands for diameter at breast height. Entrance dimensions are not included in this table because only one lateral cavity was considered suitable and its entrance dimensions met the established criteria. Refer to the Methods section for details on classifying decay and canopy closure. NA means that measurements could not be taken on cavity 13, but the cavity was visually assessed.
| |
| |
| Stand type |
Cavity
type |
|
Tree
species |
dbh (cm) |
Decay class |
Canopy closure
class |
Cavity height
(m) |
Floor diameter (cm) |
Cavity
depth
(cm) |
| |
| Balsam fir |
Apical |
Balsam fir |
51 |
5 |
1 |
2.0 |
36 |
99 |
| Clearcut |
Lateral |
White birch |
51 |
6 |
1 |
2.0 |
28 x 18 |
79 |
| Clearcut |
Apical |
Balsam fir |
22 |
7 |
1 |
1.7 |
18 |
51 |
| Clearcut |
Apical |
Balsam fir |
28 |
8 |
1 |
1.3 |
18 |
69 |
| Clearcut |
Apical |
Conifer sp. |
29 |
8 |
1 |
2.2 |
18 |
132 |
| Black spruce |
Apical |
Spruce sp. |
32 |
8 |
1 |
3.3 |
18 |
79 |
| Clearcut |
Apical |
Balsam fir |
30 |
8 |
1 |
1.3 |
15 |
53 |
| Balsam fir |
Apical |
White birch |
31 |
7 |
2 |
1.8 |
23 |
43 |
| Clearcut |
Apical |
Balsam fir |
24 |
8 |
2 |
1.8 |
15 |
66 |
| Black spruce |
Apical |
Balsam fir |
29 |
7 |
2 |
2.1 |
15 |
53 |
| Balsam fir |
Apical |
Balsam fir |
21 |
8 |
3 |
1.5 |
17 |
56 |
| Black spruce |
Apical |
Balsam fir |
36 |
8 |
3 |
1.8 |
25 |
81 |
| Balsam fir |
Apical |
Balsam fir |
31 |
8 |
3 |
1.0 |
NA |
NA |
| Clearcut |
Apical |
Spruce sp. |
26 |
8 |
3 |
2.0 |
17 |
81 |
| Clearcut |
Apical |
Balsam fir |
34 |
8 |
3 |
3.5 |
20 |
119 |
| Balsam fir |
Apical |
Balsam fir |
36 |
7 |
3 |
1.5 |
24 |
41 |
| Clearcut |
Apical |
Balsam fir |
20 |
8 |
3 |
1.8 |
15 |
76 |
| Black spruce |
Apical |
Conifer sp. |
22 |
8 |
3 |
3.4 |
84 |
14 |
|
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