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Table 2 Genotypic composition of birds sampled during 2016 & 2017 breeding seasons

From: Patterns of introgression vary within an avian hybrid zone

Ā 

BC-NESP

BC-SALS

F1/F2

NESP

SALS

Adults

Nestlings

Total birds

Coastal site

32% (53)

49% (82)

10% (16)

5% (9)

4% (6)

166

300

466

Inland site

37% (19)

29% (15)

17% (9)

15% (8)

2% (1)

52

26

78

Total birds

33% (72)

45% (97)

12% (25)

8% (17)

3% (7)

218

326

544

  1. Genotypic classes: pure Saltmarsh Sparrow (SALS), pure Nelsonā€™s Sparrow (NESP), first-generation hybrids (F1/F2), backcrossed Saltmarsh Sparrow (BC-SALS), and backcrossed Nelsonā€™s Sparrow (BC-NESP)