| S21.Summary: Ecological bases of endocrine phenomena. Convenors: Wingfield, J.C. & Silverin, B. | 1209 |
| S21.1: Changes in reproductive hormones and body mass through the reproductive cycle in the Adélie Penguin Pygoscelis adeliae, with associated data on courting-only individuals. Vleck, C.M., Bucher, T.L., Reed, W.L & Kristmundsdottir, A.Y. | 1210-1223 |
| S21.2: Seasonal endocrinology of neotropical passerines: A comparative approach. Wikelski, M., Hau, M., Robinson, W.D. & Wingfield, J.C. | 1224-1241 |
| S21.3: Seasonal patterns in testosterone, corticosterone and song in Reed Warblers, Acrocephalus scirpaceus. Dittami, J.P., Millesi, E., Gahr, M., Hoi, H., Hemetsberger, J., Donnerbaum, K. & Möstl, E. | 1242-1250 |
| S21.4: A novel technique for injecting behaviourally-active peptides into the brains of wild, freely-behaving passerines. Romero, L.M. & Wingfield, J.C. | 1251-1256 |
| S21.5: Brain aromatase in laboratory and free-living songbirds: Relationships with reproductive behaviour. Balthazart, J., Foidart, A., Baillien, M. & Silverin, B. | 1257-1289 |
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