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Table 5 Comparison peak concentrations of airborne J. ashei pollen (December–January) to J. virginiana pollen (February–March) captured at Tulsa, OK. * = concentration of invasive pollen higher than local pollen

From: Gene flow between diploid and tetraploid junipers - two contrasting evolutionary pathways in two Juniperus populations

 

Peak concentration, pollen grains/m3

 

year

(season)

J. ashei, from southern Oklahoma, Texas

J. virginiana from local Tulsa area

foreign (J. ashei) vs.

vs. local (J. virginiana) pollen

1987–88

175

655

0.27:1

1988–89

546

1057

0.51:1

1989–90

257

1115

0.23:1

1990–91

333

4442

0.07:1

1991–92

158

1156

0.14:1

1992–93

802

1248

0.64:1

1993–94

2027

1311

1.55:1*

1994–95

947

1485

0.64:1

1995–96

2411

2027

1.19:1*