Relatively stable post-LGM demographic histories of the black-faced and royal spoonbills
We reconstructed the historical demographic trajectories of the two sister spoonbill species with SMC ++ (Terhorst, Kamm, & Song, 2017). The N e of the black-faced spoonbill was estimated to be about 8,900 individuals at the LGM (approximately 22,000 years ago), which then gradually declined to 7,432 individuals until around 435 years ago (Fig. 2A). Conversely, the royal spoonbill had anN e that gradually increased from approximately 7,800 individuals at the LGM to 8,130 individuals around 500 years ago (Fig. 2A). The similar post-LGM N e trajectories of the two species also make the royal spoonbill an ideal control group to infer the effect of a recent bottleneck on the genome of the black-faced spoonbill.