Demographic Monitoring of Arabis Fecunda in the Sapphire Range Ravalli County
Demographic Monitoring of Arabis Fecunda in the Sapphire Range Ravalli County
Peter Lesica
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Arabis fecunda populations at Charley's Gulch did experience an increase in both recruitment and fecundity. The negative response at Birch Creek, only five miles distant, is difficult to explain. Negative growth may be the result of mortality due to disturbance of the habitat by livestock or ungulate grazers, but we did not observe recent slumping of the soil as in 1988. Future observations may help explain this dilemma. Table 1. Population density and fecundity data for Arabis fecunda in long-...term monitoring transects, 1987- 1990. Density (plants/m'^) Population growth plants fruiting # fruits per fruiting plant # fruits per inflorescence % plants with more than one rosette % one-rosette plants with fruit % multi-rosette plants with fruit Mean # seeds per fruit (±SD, n=25) Birch Creek 4. 8 Charley's Gulch 1987 6. 5 1988 4. 6 6. 0 1989 4. 9 5. 5 1990 4. 6 7. 0 1988 -0. 14 -0. 08 1989 0. 05 -0. 08 1990 -0. 07 0. 18 1987 35% 42% 1988 11% 15% 1989 47% 36% 1990 27% 42% 1987 3. 8 5. 1 1988 14.
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