Table 3. Probabilities of sighting at least one Ivory-billed Woodpecker for populations of different sizes, given areas surveyed in 2004–2005 and 2005–2006 in an estimated 19 700-ha tract along White River (WR) and a 9500-ha tract at Bayou de View (BDV). Also included are joint probabilities of detection in at least 1 year, assuming independent probabilities between years.
| |
| |
|
|
Population Size |
| Survey Area
|
|
1 |
2 |
5 |
10 |
20 |
| |
|
BDV |
2004–2005 |
0.483 |
0.733 |
0.963 |
0.999 |
1.000 |
|
|
2005–2006 |
0.544 |
0.792 |
0.980 |
1.000 |
1.000 |
|
|
combined |
0.764 |
0.944 |
0.999 |
1.000 |
1.000 |
|
WR |
2004–2005 |
0.587 |
0.829 |
0.988 |
1.000 |
1.000 |
|
|
2005–2006 |
0.443 |
0.690 |
0.946 |
0.997 |
1.000 |
|
|
combined |
0.770 |
0.947 |
0.999 |
1.000 |
1.000 |
|
| |
|