Table 1.

Effect of natal dispersal status on LRS, annual number of recruits produced and return rate for (a) individuals whose brood size was not manipulated and (b) experimental individuals (i.e. individuals with increased or decreased brood size and control individuals). For (b), the interaction between natal dispersal status and lifetime brood size manipulation status is shown. χ² and p-values refer to the LR test. Significant effects are shown in italics.

fitness measure	variable	χ2	d.f.	p-values
(a) individuals whose brood size was not manipulated
LRS	natal dispersal status	0.95	1	0.329
annual number of recruits	natal dispersal status	0.15	1	0.694
annual return rate	natal dispersal status	2.01	1	0.156
(b) experimental individuals
LRS	natal dispersal status	9.97	1	0.002
	brood size manipulation status	2.45	2	0.294
	natal dispersal status × brood size manipulation status	8.67	2	0.013
annual number of recruits	natal dispersal status	15.17	1	<0.001
	brood size manipulation status	22.38	2	<0.001
	natal dispersal status × brood size manipulation status	12.79	2	0.002
annual return rate	natal dispersal status	8.16	1	0.004
	brood size manipulation status	16.57	2	<0.001
	natal dispersal status × brood size manipulation status	9.30	2	0.009