Table 2.
Effects of photoperiod on estrogen receptor (ER)α- and ERβ-immunoreactive cells/mm2 (n = 4–5/group)
| ERα
|
ERβ
|
|||||||
|---|---|---|---|---|---|---|---|---|
| Peromyscus maniculatus
|
Peromyscus polionotus
|
Peromyscus maniculatus
|
Peromyscus polionotus
|
|||||
| Long day | Short day | Long day | Short day | Long day | Short day | Long day | Short day | |
| vLS | 2668 ± 87 | 3015 ± 213 | 2454 ± 250 | 3375 ± 323* | 832 ± 301 | 210 ± 210 | 1143 ± 187 | 269 ± 212* |
| MPOA | 2910 ± 259 | 3256 ± 479 | 3897 ± 229† | 4521 ± 309 | 2889 ± 255 | 3036 ± 443 | 3504 ± 209 | 3550 ± 220 |
| BNST | 2437 ± 45 | 2878 ± 175* | 3521 ± 256† | 3924 ± 142* | 4034 ± 349 | 2941 ± 375* | 4218 ± 95† | 3429 ± 161* |
| PVN | 1681 ± 212 | 1345 ± 357 | 2387 ± 224† | 2361 ± 153 | 1387 ± 250 | 1345 ± 280 | 1992 ± 191 | 1555 ± 351 |
| VMH | 2952 ± 150 | 2300 ± 203* | 2697 ± 244 | 2420 ± 169 | 1922 ± 405 | 742 ± 137* | 3235 ± 210† | 2153 ± 267* |
| MEA | 2342 ± 206 | 2423 ± 303 | 2218 ± 344 | 2294 ± 206 | 3831 ± 241 | 2489 ± 638* | 4579 ± 774 | 3134 ± 151* |
*
Effect of photoperiod within species, P < 0.05;
†
overall species difference, P < 0.05.
BNST, bed nucleus of the stria terminalis; MEA, medial amygdala; MPOA, medial pre-optic area; PVN, paraventricular nucleus; LS, ventral lateral septum; VMH, ventromedial hypothalamus.