Effects of shortened host life span on the evolution of parasite life history and virulence in a microbial host-parasite system

Table 1 Pearson correlation coefficients for five parasite traits.

Trait		Reproductive load	Latency time	Infectious load	Virulence
Infectivity	Early	+0.38	-0.56(*)	+0.21^(a)	-0.40
	Late	-0.12	+0.12	+0.45^(a)	+0.34
	Overall	+0.02	+0.08	+0.29	-0.04
Reproductive load (day 7)	Early		-0.30 ^a	+0.44^(a)	-0.75*^a
	Late		-0.80**^a	+0.45^(a)	-0.34 ^a
	Overall		-0.55*	+0.47*	-0.38(*)
Latency time	Early			-0.61(*)^a	-0.07^(a)
	Late			-0.55(*)^a	+0.51^(a)
	Overall			-0.58**	+0.01
Infectious load (day 13)	Early				-0.15
	Late				+0.09
	Overall				+0.14

Correlations were based on the means per parasite selection line and calculated across selection lines within treatments (early-killing, late-killing) and for all selection lines pooled (overall). Within-treatment tests were complemented by Analyses of Covariance (ANCOVA), with treatment as a cofactor, one parasite trait as covariate (line) and another (column) as response variable. For definition of traits, see Methods. Significant correlations marked in bold (uncorrected for multiple testing). Note: ANCOVA can reveal significant relationships, while correlation tests within treatments are non-significant.
(*) p < 0.10; * p < 0.05; ** p < 0.01; main effect of covariate in ANCOVA: ^(a) p < 0.09; ^a p < 0.05

ISSN: 2730-7182