Table 2.

Results of final LMs for all variables tested

Group	Variable		Variation	Final model		Pop		Season		Sea * Pop
		Trans.	Adj. R2 (%)	df	F	df	F	df	F	df	F
Mating resources	Available nests	log	77	5,35	28.2**	4,35	34.9**	1,35	1.1	NS	NS
	Proportion of occupied nests	asn	46	5,35	7.8**	4,35	9.4**	1,35	1.5	NS	NS
	Soft-shell clams		37	4,36	6.9**	4,36	6.9**
	Size soft-shell clams		60	4,83	33.5**	4,83	33.5**
Body size	Female		32	5,294	28.6**	4,294	22.3**	1,294	53.6**	NS	NS
	Male		27	5,294	22.8**	4,294	28.0**	1,294	1.9	NS	NS
Densities and sex ratios	Number of females		70	5,35	20.2**	4,35	23.5**	1,35	6.6*	NS	NS
	Number of males		69	5,35	18.6**	4,35	22.4**	1,35	3.6	NS	NS
	ASR	asn	20	5,35	3.0*	4,35	3.5*	1,35	0.9	NS	NS
	Number of ready-to-mate females		70	5,35	19.8**	4,35	23.3**	1,35	5.9*	NS	NS
	Number of ready-to-mate males		50	9,31	5.5*	4,31	9.0**	1,31	0.9	4,31	3.1*
	OSR	asn	37	5,35	5.6*	4,35	6.0*	1,35	3.9	NS	NS
Mating assay	Brood size		18	4,44	3.7*	4,44	3.7*
	Egg size		64	4,761	338.1**	4,761	338.1**
	Egg density		42	4,13	4.1*	4,13	4.2*

Notes: Given are groups, the specific variables tested and how variables were transformed [trans. log (log₁₀) or asn (arcsine)] to achieve normality; the variation that is explained by the model in % (adjusted R²), the fit of the final model; the F-statistic for the independent variables “population” (pop, six sites) and “season” (early vs. late during the breeding season), and the F-statistic for the interaction term. Significant results are denoted in bold with **(P < 0.0001) and *(P < 0.05). Non-significant results are denoted with NS, empty rows denote “not tested.”