Total number of bird sightings by species in nest box treatments and control areas of vineyards.

Species were categorized into guilds based on the Birds of North America reference collection, where I = mostly insectivore, O = omnivore, and G = Granivore.

本研究以《北美鸟类》参考汇编为依据，将物种划分为食性功能群（guild），其中符号I代表主要食虫性类群，O代表杂食性类群，G代表食谷性类群。