Life-history responses of insects to water-deficit stress: a case study with the aphid Sitobion avenae

BMC Ecology

Table 1 Estimates of variance components for life-history traits of Sitobion avenae populations

Traits	Generation	Variance source	df	F	P	% total
DT5	1st	Source	2	6.4	0.002	0.8
		Treatment	2	53.8	< 0.001	6.8
		Source × treatment	4	11.5	< 0.001	2.9
		Clone (source)	98	5.9	< 0.001	36.5
		Error	843	–	–	53.0
	5th	Source	2	65.7	< 0.001	9.7
		Treatment	2	39.9	< 0.001	5.9
		Source × treatment	4	14.1	< 0.001	4.2
		Clone (source)	98	2.5	< 0.001	18.1
		Error	843	–	–	62.2
10-d Fecundity	1st	Source	2	50.8	< 0.001	4.9
		Treatment	2	111.8	< 0.001	10.7
		Source × treatment	4	5.1	< 0.001	1.0
		Clone (source)	98	9.1	< 0.001	42.9
		Error	843	–	–	40.5
	5th	Source	2	36.6	< 0.001	3.6
		Treatment	2	157.3	< 0.001	15.4
		Source × treatment	4	17.7	< 0.001	3.5
		Clone (source)	98	7.6	< 0.001	36.3
		Error	843	–	–	41.3
Adult weight	1st	Source	2	27.4	< 0.001	3.2
		Treatment	2	43.9	< 0.001	5.1
		Source × treatment	4	13.8	< 0.001	3.2
		Clone (source)	98	6.9	< 0.001	39.3
		Error	843			49.1
	5th	Source	2	77.3	< 0.001	10.1
		Treatment	2	42.0	< 0.001	5.5
		Source × treatment	4	3.2	0.012	0.8
		Clone (source)	98	4.5	< 0.001	28.7
		Error	843	–	–	55.0

Main effects of population source (source), water stress treatments (treatment), clone nested in source and interactions are shown; DT5, total developmental time of the nymphal stage; significant effects highlighted in italics

ISSN: 1472-6785