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Table 1 Finch species sampled in this study, including information about general diet category, sampling island, and number of specimens collected during each of the dry and wet season

From: The gut of the finch: uniqueness of the gut microbiome of the Galápagos vampire finch

Species Common name Diet category Island No. samples (season)
Dry Wet
G. septentrionalis Vampire finch Carnivorous2, inc. blood Wolf 16 0
Darwin 15 0
G. acutirostris Sharp-beaked ground finch Insectivorous3 Genovesa 6 0
G. difficilis Sharp-beaked ground finch Insectivorous3 Pinta 3 0
G. fortis Medium ground finch Herbivorous (seeds)4 San Cristóbal 1 5
Santa Cruz 3 1
Santa Fé 0 1
G. fuliginosa Small ground finch Herbivorous (seeds)4 Española 0 5
North Seymour 0 1
San Cristóbal 7 8
Santa Cruz 4 1
Santa Fé 0 1
G. magnirostris Large ground finch Herbivorous (seeds)4 Genovesa 2 0
Pinta 3 0
G. conirostris Large cactus finch Herbivorous (Opuntia cactus) Española 0 2
Genovesa 2 0
G. scandens Cactus finch Herbivorous (Opuntia cactus) Santa Cruz 3 1
Santa Fé 0 2
Ce. olivacea Green warbler finch Insectivorous Española 0 4
Pinta 3 0
C. parvulus Small tree finch Insectivorous San Cristóbal 4 2
Santa Cruz 0 4
C. pallida1 Woodpecker Finch Insectivorous Santa Cruz 0 1
P. crassirostris Vegetarian finch Herbivorous (leaves) Santa Cruz 0 3
Total 12 Species 9 Islands 72 42
  1. Genus abbreviations: C = Camarhynchus, Ce = Certhidia, G = Geospiza, P = Platyspiza
  2. 1The solitary C. pallida sample was excluded from statistical analyses
  3. 2During the dry season, G. septentrionalis eats blood, eggs, scat of the Nazca boobies
  4. 3Although these finch species are classically identified as seed-eaters, behavioral observations at the time of collection indicated that G. difficilis on Pinta was foraging on 100% insects in both wet and dry seasons, and G. acutirostris on Genovesa fed 98% on insects in the wet season, and 80% on insects in the dry season
  5. 4While these finches predominantly eat seeds, they consume insects on occasion