Table 1.

Mean and median abundances of short-tailed shearwaters at Montagu Island in even years and odd years

Interval	Mean (±SE) even	Mean (±SE) odd	P	Median even	Median odd	Mean ratio	Median ratio
1967–2016	1,237 (92)	1,092 (101)	0.30	1,144	1,066	1.13	1.07
1980–2016	1,064 (89)	876 (80)	0.12	966	831	1.22	1.16
1990–2016	916 (57)	783 (87)	0.22	952	769	1.17	1.24
2000–2016	942 (64)	716 (111)	0.10	962	764	1.31	1.26
2005–2016	907 (91)	639 (127)	0.13	957	641	1.42	1.49

Chicks per hectare. First series without 1967 and 1999. Second two series without 1999, as explained in Methods.