Hooked on you: shape of attachment structures in cymothoid isopods reflects parasitic strategy

Table 2 Results from OLS regressions of the full P1 and P7 datasets

	P1			P7
Model terms	df	z-score	p-value	df	z-score	p-value
Shape ∼ Size	1	1.92	<0.01*	1	0.81	0.23
Shape ∼ Mode	2	2.98	<0.01*	2	2.82	<0.01*
Shape ∼ Size * Mode	2	1.09	0.86	2	1.66	0.03*
	Pairwise (Group slopes)
	E	M	G	E	M	G
E	–	0.62	0.35	–	0.01*	0.59
M	0.54	–	0.63	1.85	–	0.28
G	0.27	0.53	–	0.34	0.75	–
	z-score = 1.07, Res.df = 12			z-score = 1.53, Res.df = 13
	p = 0.86			p = 0.05*
	Pairwise (Group Means)
	E	M	G	E	M	G
E	–	<0.01*	<0.01*	–	<0.01*	0.01*
M	3.78	–	0.37	3.94	–	0.94
G	3.31	0.31	–	2.62	1.33	–
	z-score = 3.08, Res.df = 124			z-score = 2.69, Res.df = 15
	p < 0.01			p < 0.01*
	Pairwise (Allometry-free group means)
	E	M	G	E	M	G
E	–	<0.01*	<0.01*	–	<0.01*	<0.01*
M	3.79	–	0.37	3.82	–	0.76
G	3.32	0.31	–	3.41	0.81	–
	z-score = 3.10, Res.df = 14			z-score = 2.82, Res.df = 16
	p < 0.01			p < 0.01*

Group Slopes are pairwise comparisons between the allometric vectors of parasitic mode, Group Means are pairwise comparisons of Procrustes distance between modes after accounting for variation in size, and Allometry-free Group Means are the same comparisons as Group Means but using the residuals from regression of shape on size as shape variables. For pairwise comparisons, above the diagonal are p-values, and below the diagonal are z-scores. Below each pairwise comparison table are the values for the model (Type I Sum of Squares). E = External, G = Gill, M = Mouth

ISSN: 2730-7182