Demographic Monitoring of Penstemon Lemhiensis Beaverhead National Forest 199
Demographic Monitoring of Penstemon Lemhiensis Beaverhead National Forest 199
J Stephen Shelly
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Once again, further decreases occurred in the French Creek - Park Mine and Badger Pass North transects. Total population size decreased from the 1990 level at the French Creek - Discovery Mine transect, but equalled the original total present in 1989. The total number of plants in the French Creek - Park Mine transect decreased by 31 from the 1990 total, resulting in a population decline of 52%. Extensive sheet erosion appears to be continuing at the site, and may have been a contributing facto...r in the loss of the 55 established plants that have not survived from 1989 to 1991. The fecundity and vigor of the surviving individuals in this transect was drastically lower in 1991; no plants flowered or fruited. Additionally, no fruiting plants were found in the vicinity of the transect, so we were unable to collect data on seed production for this site. The total number of plants at the French Creek - Discovery Mine transect decreased by 12 in 1991, resulting in a -25. 5% population growth rate.
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