Table 4 Comparison of habitat use versus availability to identify grassland bird habitat preferences among successional ecotypes during winter 2001 and 2002 at Aransas National Wildlife Refuge, Texas, USA. Successional ecotypes were defined as the number of complete growing seasons that occurred prior to sampling.

Recently burned

0.25

<0.01 (<0.01 to 0.03)

0.54 (0.42 to 0.65)

0.01 (<0.01 to 0.03)

0.25 (0.15 to 0.35)

One season

0.15

0.15 (0.02 to 0.28)

0.13 (0.01 to 0.26)

0.30 (0.16 to 0.47)

0.17 (0.03 to 0.31)

Two seasons

0.40

0.58 (0.51 to 0.65)

0.30 (0.24 to 0.37)

0.54 (0.47 to 0.61)

0.52 (0.45 to 0.59)

Three seasons

0.20

0.26 (0.14 to 0.38)

0.03 (0.02 to 0.08)

0.16 (0.05 to 0.25)

0.06 (0.01 to 0.12)