Comparison of life history traits of Tanais dulongii (Tanaidacea: Tanaididae) in natural and artificial marine environments of the south-western Atlantic

Table 2 Results of two-way ANOVA for comparison of densities: variation of total density between study sites and months; variation of population groups (males, females and juveniles) in La Estafeta and Mar del Plata harbour between months and groups; and variation of female groups (pre-ovigerous, ovigerous and post-ovigerous females) among months and groups

Comparison	Source of variation	df	MS	F	P
Total density	Study site	1	1901423.50	163.29	<0.001
	Month	10	135326.52	11.62	<0.001
	Study site × month	10	125054.34	10.74	<0.001
	Error	82	11644.69
Mar del Plata harbour	Month	11	1465.91	3.74	<0.001
	Group	2	2617.81	6.67	0.002
	Month × group	22	857.52	2.19	0.004
	Error	129	392.25
La Estafeta	Month	10	94075.53	24.42	<0.001
	Group	2	299302.19	77.68	<0.001
	Month × group	20	29997.35	7.79	<0.001
	Error	129	3852.89
Females MdP harbour	Month	11	1038.59	4.11	<0.001
	Group	2	1308.39	5.18	0.007
	Month × group	22	496.15	1.96	0.011
	Error	129	252.75
Females La Estafeta	Month	10	17504.57	14.31	<0.001
	Group	2	108153.70	88.41	<0.001
	Month × group	20	9933.73	8.12	<0.001
	Error	129	1223.28

ISSN: 1438-3888