Ecological Archives A014-012-A4

Jeffrey R. Dunk, William J. Zielinski, and Haiganoush K. Preisler. 2004. Predicting the occurrence of rare mollusks in northern California Forests. Ecological Applications 14:713–729.

Appendix D. Means (±1 SD) of mesoscale variables at the scale for which we found the best model for each mollusk species.

Variable
Ancotrema voyanum (450 ha)
 
Helminthoglypta talmadgei (1250 ha)
 
Monadenia churchi (1250 ha)
 
Monadenia fidelis klamathica
(<200 ha)
 
Monadenia fidelis ochramphalus
(50 ha)
Present
Absent
 
Present
Absent
 
Present
Absent
 
Present
Absent
 
Present
Absent
                             
Plantations (ha)
75.83 (58.63)
52.02 (65.04)*
 
223.18 (222.47)
66.85 (90.40)*
 
64.50 (78.11)
87.68 (134.97)
 
31.69 (22.99)
33.18 (38.70)
 
17.67 (11.87)
6.04 (10.56)**
Young conifer, low density (ha)
33.18 (43.49)
62.71 (71.79)**
 
166.54 (169.49)
221.27 (160.60)
 
247.81 (161.69)
234.60 (195.97)
 
6.09 (9.87)
21.53 (25.29)**
 
3.74 (9.21)
6.24 (8.59)
Young conifer (ha)
37.35 (40.65)
53.27 (43.76)
 
182.71 (100.97)
170.87 (106.53)
 
135.35 (132.26)
185.17 (165.20)**
 
20.03 (15.77)
22.98 (33.24)
 
4.01 (3.60)
5.69 (8.21)
Hardwoods (ha)
23.46 (44.04)
19.21 (40.59)
 
1.71 (4.85)
43.42 (89.41)*
 
48.15 (78.06)
38.28 (66.39)*
 
18.90 (20.80)
14.36 (24.71)
 
3.41 (6.37)
1.95 (6.45)
Late seral conifer, low density (ha)
17.70 (24.59)
26.61 (39.82)
 
27.54 (43.86)
68.19 (109.23)*
 
7.42 (21.27)
15.75 (35.38)
 
11.32 (16.00)
15.19 (19.98)
 
3.39 (5.40)
5.05 (9.08)
Late seral conifer (ha)
142.69 (105.67)
99.94 (85.42)*
 
222.31 (166.99)
256.88 (176.29)
 
243.21 (188.62)
239.18 (194.80)
 
34.14 (36.31)
38.28 (39.12)
 
5.59 (7.96)
11.33 (11.95)*
Late seral hardwood dominated (ha)
48.96 (68.89)
50.70 (83.06)
 
0.00 (0.00)
106.72 (206.20)**
 
16.57 (59.54)
24.91 (65.86)
 
58.56 (41.80)
28.74 (40.31)*
 
5.09 (7.16)
4.75 (9.52)
Streams (km)
8.63 (3.53)
7.72 (3.48)
 
27.33 (4.99)
25.34 (9.92)
 
30.71 (13.32)
23.67 (11.04)**
 
2.79 (1.38)
3.26 (1.38)
 
1.24 (0.64)
0.97 (0.70)
Roads (km)
5.43 (3.37)
5.62 (4.53)
 
16.10 (8.23)
11.37 (10.91)
 
14.86 (10.70)
16.24 (11.05)
 
4.19 (2.49)
2.47 (2.04)*
 
1.26 (0.71)
0.52 (0.59)**

  *P < 0.10, **P < 0.05.


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