Fig. 1: Study details.
From: Gene regulation and speciation in a migratory divide between songbirds
a Map showing ranges of coastal (teal) and inland (yellow) Swainson’s thrushes and origin of birds used in present study (star, hybrid population in Pemberton, British Columbia, Canada). b Nocturnal activity documented for birds sampled on spring migration. The period over which photoperiod and temperature were changed to simulate migratory behavior shown in purple. Birds were sampled during the winter (late Jan, non-migratory season) and spring migration (late Mar) seasons. c, d Histology of songbird brain, showing sagittal sections through the midline and 2 mm from the midline, respectively. Example brain punches used for sampling shown in blue (HT hypothalamus, HCD hippocampus dorsal, HCV hippocampus ventral, CNH Cluster N hyperpallium, CNM Cluster N mesopallium). e Ternary plots showing genes differentially expressed in at least one of three comparisons – between migratory states (environment), subspecies (genotype) and/or the interaction between these two levels (genotype x environment, GxE). Numbers of genes differentially expressed in each category shown at triangle edges, with first triangle indicating categories. Source data for panels b and e are provided as a Source Data file. Distribution map obtained from the BirdLife International and Handbook of the Birds of the World106 (http://datazone.birdlife.org/species/requestdis). Images of brains obtained from the Zebra Finch Atlas (http://www.zebrafinchatlas.org/gene_display/histological-atlas).
