Table 1.

Assessing the likelihood of an effect on the number of Chagos songs per day at site DGN (n = 3917 days).

Predictor variable	Df	Test statistic	Adjusted p-value
Month	11	21.79	0.02459
Year	12	437.12	< 2e−16
Year:Month	110*	1963.07	< 2e−16

Test statistics and p-values obtained via type 1 ANOVA likelihood ratio tests from a negative binomial, generalized additive model. p-values have also been adjusted to account for multiple hypothesis testing using the Holm adjustment⁴⁵.

*Degrees of freedom are smaller than expected due to some years (n = 4) having missing months.