Smooth term

edf

F

p


Line 1

4.952

4.973

0.000

Line 2

3.912

1.843

0.001

Line 3

3.550

0.702

0.084

Line 4

4.072

1.294

0.007

 A smoothed term for each receiver line was included in the most parsimonious model. Estimated degrees of freedom (edf) represent the degree of nonlinear patterns in the smoother line (linear relationship = 1, edf values >1 indicate increasing nonlinear structure). F and p represent summary of statistical tests for a relationship between months and the probability of detecting an acoustic transmitter for each smoothing function (i.e., test of null hypothesis = 0 for each smoothing function). Autocorrelation structure was included to account for patterns in model residuals. See Fig. 1 for map of study area