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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