. Author manuscript; available in PMC: 2008 Oct 22.

Published in final edited form as: Horm Behav. 2006 Apr 27;50(2):223–236. doi: 10.1016/j.yhbeh.2006.03.005

Table 2.

Specific ¹²⁵I-SG binding (decompositions per minute/mg following substraction of nonspecific binding; means ± SEM) in forebrain areas of five songbird species that differ selectively in their species-typical group sizes¹.

	Territorial		Gregarious	Highly Colonial

Area²	Melba Finch	Violet-Eared Waxbill	Angolan Blue Waxbill	Spice Finch	Zebra Finch	Significant Sociality Contrasts³
*Extended amygdala:*
BSTm	772 ± 147	598 ± 134	640 ± 89	516 ± 136	827 ± 130
BSTl	550 ± 110^a	392 ± 108^a	535 ± 106^a	446 ± 101^a	1015 ± 189^b*
*Septal Complex:*
CoS	1915 ± 464^a	1972 ± 227^a	2692 ± 355^a	559 ± 263^b	1826 ± 336^a**	D**
nPC	489 ± 273^a	317 ± 316^a	450 ± 174^a	2167 ± 385^b	4720 ± 497^c***	A*,B,D**
*Preoptic area/hypothalamus:*
POA	499 ± 143	401 ± 192	627 ± 133	359 ± 168	894 ± 226
AH	723 ± 148	811 ± 164	1072 ± 126	710 ± 140	688 ± 79	D*
AM	1297 ± 212	1127 ± 181	1703 ± 145	1446 ± 245	1670 ± 181	A,C
Inf	855 ± 214^a	674 ± 156^a	647 ± 107^a	2 ± 139^b	389 ± 194^ab*	A,B*
PLH	1755 ± 340	1449 ± 200	2033 ± 298	1035 ± 174	1668 ± 228
PVN	394 ± 136	474 ± 209	761 ± 66	332 ± 105	588 ± 133
VMH-med	1300 ± 204^ab	732 ± 185^a	1684 ± 179^b	1554 ± 231^b	1719 ± 281^b*	A*,B,C*
VMH-lat	1075 ± 183	534 ± 187	1106 ± 149	1380 ± 206	1303 ± 309	A,B
*Other forebrain areas:*
Ac	1697 ± 206	1580 ± 280	2161 ± 541	1724 ± 442	2285 ± 467
DMP	856 ± 244^abc	1220 ± 146^ac	493 ± 135^b	467 ± 115^b	1004 ± 184^c*	A,C
Hab	556 ± 236^a	605 ± 165^a	460 ± 105^a	1351 ± 114^b	509 ± 163^a**
Hp, ventral	1018 ± 212^ac	1700 ± 170^bd	1564 ± 175^cd	866 ± 248^a	1383 ± 233^ad*
N, medial	3388 ± 419	4443 ± 363	4094 ± 270	3531 ± 313	3676 ± 295
NDB	356 ± 92	469 ± 185	683 ± 117	373 ± 128	811 ± 206
VP	1372 ± 279	1439 ± 171	1661 ± 321	1531 ± 359	2191 ± 225

Different letters next to the means indicate significant species differences (Fisher's PLSD, p < .05) following significant ANOVA (* p < .05; ** p < .01; *** p < .001; sex × species; no main effects of sex were observed, thus male and female data are shown pooled). Four males and four females of each species were examined (total n = 40).

Data are not shown for target areas that exhibited no specific binding, including the LSc, LSr, MS, SH, and TnA. See Methods for abbreviations (“Nomenclature and abbreviations”).

Sociality contrasts were conducted by pooling subjects of a given grade of sociality (e.g., by pooling territorial or colonial species). Letters indicate main effects of sociality (* p < .05; ** p < .01; *** p < .001 in a two-way ANOVA including sex as a factor; see Results for sex effects). Contrast A: territorial versus flocking (“flocking” includes all three gregarious/colonial species). Contrast B: territorial versus colonial, excluding the intermediate Angolan blue waxbill. Contrast C: territorial versus moderately gregarious (Angolan blue waxbill). Contrast D: moderately gregarious versus colonial.