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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*