Avian blood parasite infection during the non-breeding season: an overlooked issue in declining populations?

BMC Ecology

Table 1 Results of general linear models determining whether H:L ratio or standardised WBC count are influenced by Haemoproteus infection

	H:L ratio					WBC index
Variable	df	F	p	Estimate	SE	df	F	p	Estimate	SE
Number of lymphocytes	1, 70	330.88	<0.001	-0.029	0.002	NA	NA	NA
Number of RBCs per slide view	NA	NA	NA			1, 66	1.521	0.222	-0.006	0.004
Parasite infection status (Infected)	1, 69	10.547	0.002	-0.235	0.067	1, 65	4.439	0.039	-0.372	0.173
Time of day	1, 64	0.147	0.703			1, 63	6.829	0.011	-0.095	0.042
Age (Juvenile)	1, 65	1.027	0.315			1, 61	0.404	0.528
Sex (Male)	1, 66	1.195	0.278			1, 62	3.550	0.064	0.334	0.180
Year (2008)	1, 67	2.034	0.158			1, 64	4.556	0.037	-0.319	0.174
Month (December)	1, 68	3.856	0.026	-0.053	0.088	1, 60	0.004	0.947
Month (February)				-0.232	0.096

For significant terms, parameter estimates with SE are presented; for non-significant main effects, statistics follow reinsertion of the term into the minimum adequate model (MAM) and subsequent model comparison. Parameter estimates for two level factors are for the stated factor compared to the other factor; estimates for month are for the stated month when compared to April. ‘NA’ indicates that this term was not included in the model.

ISSN: 1472-6785