Ecological Archives A016-020-A6

Örjan Bodin, Maria Tengö, Anna Norman, Jakob Lundberg, and Thomas Elmqvist. 2006. The value of small size: loss of forest patches and thresholds in southern Madagascar. Ecological Applications 16:440–451.

Appendix F. Modeling results with successive forest removal.

TABLE F1. Crop pollination zone cover as a fraction of the total geographical area for varying minimum patch area (with the majority foraging distance set at 400, 900, and 1400 meters).

Majority foraging distance (m) Minimum patch area (ha) Crop pollination zone (%)
400
0.5
44.1
400
1.0
29.7
400
3.0
19.0
400
5.0
14.4
400
7.0
12.0
400
9.0
10.8
900
0.5
88.3
900
1.0
70.4
900
3.0
52.0
900
5.0
41.2
900
7.0
33.6
900
9.0
30.6
1400
0.5
100.0
1400
1.0
94.3
1400
3.0
79.2
1400
5.0
66.8
1400
7.0
57.3
1400
9.0
53.3

Notes: All patches smaller than the minimum patch area are removed.

 

TABLE F2. Componentsí areas as fractions (%) of the total forest area. The largest component, second largest component, number of components, and components with an area equal to or below 10 ha are included in the table. Numbers within parentheses represent the componentís area with respect to initial habitat area, i.e., before removal of any patches equal to or above 1 ha.

Vagility (m) Minimum patch area (ha) 1'st component (%) 2'nd component (%) # components =< 10 ha (%)
500
1
7.7 (7.7)
6.5 (6.5)
102
12.8 (12.8)
500
3
8.4 (7.3)
7.1 (6.2)
72
14.7 (12.7)
500
5
8.7 (6.8)
7.9 (6.2)
53
8.6 (6.7)
500
7
8.7 (6.2)
8.4 (6.0)
42
3.2 (2.3)
500
9
8.9 (6.0)
8.4 (5.7)
38
0.8 (0.6)
1000
1
69.2 (69.2)
5.0 (5.0)
29
3.7 (3.7)
1000
3
14.7 (12.7)
11.3 (9.8)
34
4.4 (3.8)
1000
5
15.4 (12.0)
9.0 (7.0)
33
3.7 (2.9)
1000
7
11.3 (8.0)
9.8 (7.0)
28
1.7 (1.2)
1000
9
10.3 (7.0)
10.0 (6.8)
28
0.8 (0.6)
1500
1
86.4 (86.4)
12.1 (12.1)
5
0.1 (0.1)
1500
3
85.8 (74.3)
6.8 (5.9)
6
0.6 (0.5)
1500
5
51.8 (40.5)
19.4 (15.2)
10
0.5 (0.4)
1500
7
34.3 (24.5)
18.9 (13.5)
11
0.2 (0.1)
1500
9
34.1 (23.1)
17.7 (12.0)
11
0.0 (0.0)


[Back to A016-020]