Demographic Monitoring of Arabis Fecunda in the Pioneer Range Beaverhead Nation
Demographic Monitoring of Arabis Fecunda in the Pioneer Range Beaverhead Nation
Peter Lesica
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This change was particularly dramatic at the Lime Gulch 5 site where fecundity was very low in 1989. Nonetheless, fecundity, as measured by both of these statistics, was higher at the Vipond Park site, and population growth was also higher at this site. The percentage of plants with more than one rosette remained constant at both sites. The mean number of seeds per fruit was constant at Lime Gulch but decreased at Vipond Park. In 1989 most of Montana received above-normal precipitation in late ...summer and early autumn, and although snowpack was light in southwestern Montana during the following winter, late spring precipitation was also above average. Previous to this period, southwestern Montana had experienced two years of serious drought conditions. Since germination of Arabis fecunda seed occurs readily without any cold treatment (Lesica, unpublished data), the wet period in late summer and early autumn probably resulted in high levels of recruitment and strong seedling growth. Both higher than average levels of autumn and spring precipitation may have contributed to the dramatic increase in fecundity.
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