Table 1.

Scaling of jaw morphology over ontogeny in Catoprion mento and Pygopristis denticulata. For scaling scenarios, I = isometric growth, P = positive allometry and N = negative allometry.

independent variables	r2	isometric slope	intercept	slope	confidence intervals	p	scaling scenario	Δ slope	elevation? (p =)	shift?
Tooth Aspect RatioC	0.243	0	0.622	0.125	0.070–0.224	5.16 × 10−2	P	0.16	<0.001	0.5
Tooth Aspect RatioP	0.654	0	0.632	0.211	0.127–0.349	4.17 × 10−3	P
Ant. MAC	0.386	0	0.700	−0.053	(−0.090)–(−0.031)	1.54 × 10−2	N	0.79	0.007	0.5
Ant. MAP	0.612	0	0.566	0.039	0.023–0.067	6.37 × 10−3	P
Post. MAC	0.004	0	1.206	0.132	0.068–0.254	4.20 × 10−1	P	0.72	<0.001	<0.001
Post. MAP	0.206	0	1.020	0.111	0.054–0.231	1.10 × 10−1	P
Occlusional OffsetC	0.958	1	−0.737	1.057	0.916–1.220	1.60 × 10−8	I	0.68	0.01	0.15
Occlusional OffsetP	0.995	1	−0.770	1.026	0.961–1.095	1.66 × 10−9	I
Jaw LengthC	0.986	1	0.397	0.983	0.905–1.067	5.94 × 10−11	I	0.001	<0.001	0.06
Jaw LengthP	0.998	1	0.419	0.834	0.799–0.870	7.65 × 10−11	N
Muscle CSAC	0.993	2	−1.998	1.946	1.770–2.139	6.50 × 10−7	I	0.28	<0.001	0.53
Muscle CSAP	0.983	2	−1.608	2.127	1.781–2.541	5.16 × 10−5	I
Second Moment-0C	0.960	4	−10.735	4.964	4.311–5.751	1.33 × 10−8	P	0.13	0.65	0.20
Second Moment-0P	0.984	4	−9.779	4.365	3.901–4.885	7.44 × 10−8	I
Second Moment-90C	0.974	4	−12.090	4.331	3.868–4.849	1.44 × 10−9	I	0.30	<0.001	0.84
Second Moment-90P	0.942	4	−9.186	3.861	3.121–4.776	6.79 × 10−6	I