Geoscience Reference
In-Depth Information
1.0
76
0.8
0.6
0.4
0.2
0.0
0
500
1000
1500
Distance (km)
2000
2500
FIGURE 9.1
Estimated probability of house finch being present on a Breeding Bird Survey route in 1976 as
a function of distance from Long Island.
1.0
76
81
86
91
96
0.8
0.6
0.4
0.2
0.0
0
500
1000
1500
Distance (km)
2000
2500
FIGURE 9.2
Estimated probability of house finch colonizing a Breeding Bird Survey route between succes-
sive 5-year periods as a function of distance from Long Island. The colonization probability is
indexed in terms of the beginning period; that is, “76” relates to the probability of colonization
occurring between 1976 and 1981.
