Abstract
Broom snakeweed (Gutierrezia sarothrae (Pursh) Britt. R juveniles with winter precipitation (r = 0.69); and mature plants with previous fall precipitation (r = 0.62). Only 1 cycle occurred at the Snake River Plains site. Following the snakeweed invasion into crested wheatgrass seedings in the mid 1980's, the population was at the top of its population cycle when the study began in 1990, dropped back and fluctuated between 6-10% cover from 1992 to 1999, and died out in 2001. Although density of mature plants did not change much during the middle part of the study, the change in snakeweed cover was correlated with spring (r = 0.81) and total precipitation (r = 0.60), reflecting increase and decrease in size of plants in response to precipitation. DOI:10.2458/azu_jrm_v55i4_ralphs3
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