Table 4. Regression parameters for the log ratio of gaster volume: body weight (GV/BW) vs. body weight (BW) for all species.

GV/BW vs. BW							HV/BW vs. BW
Species	code	slope	s.e. of slope	t-value	p-value	% change in relative GV for 10-x in BW	slope	s.e. of slope	t-value	p-value
S. xyloni AZ	115	0.008	0.030	0.26	0.797	–				n.s.
S. amblychila	101	−0.025	0.027	−0.932	0.353	–				n.s.
S. richteri	107	0.034	0.024	1.44	0.154	–	−0.059	0.023	−2.56	0.013
S. invicta	112	0.050	0.031	1.61	0.111	–	−0.049	0.024	−2.07	0.041
S. interrupta	102	0.101	0.034	2.98	0.004	+26				n.s.
S. quinquecuspis	106	0.129	0.034	3.75	0.001	+35				n.s.
S. xyloni OK	111	0.133	0.029	4.64	0.00001	+36				n.s.
S. megergates	104	0.145	0.048	3.01	0.005	+40				n.s.
S. macdonaghi	103	0.146	0.039	3.77	0.0003	+40				n.s.
S. aurea	110	0.184	0.031	5.95	0.000001	+53	0.138	0.023	6.09	0.000000
S. pythia	105	0.225	0.088	2.560	0.015	+68				n.s.
S. gayi	114	0.258	0.053	4.84	0.00002	+80	0.116	0.034	3.371	0.002
S. geminata GUA&CR	113	−0.070	0.010	−7.04	0.000000	−15	0.153	0.011	13.31	0.000000
S. saevissima	108	−0.211	0.054	−3.92	0.0004	−38	−0.295	0.049	−5.97	0.000001
S. geminata TX&FL	116	−0.175	0.0207	−8.45	0.000	−37	0.117	0.025	4.722	0.000004

Significantly positive slopes (red) indicate that the relative gaster size increases as body size increases, and negative slopes (blue) that it decreases. The species are arranged in order of increasing slope. The Factor Increase is the factor by which the ratio would change for a 10-fold increase in body weight (BW).