Effects of ungulate disturbance and weather variation on Pediocactus winkleri: insights from long-term monitoring

Western North American Naturalist
By: , and 

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Abstract

Population dynamics and effects of large ungulate disturbances on Winkler cactus (Pediocactus winkleri K.D. Heil) were documented annually over a 20-year time span at one plot within Capitol Reef National Park, Utah. This cactus species was federally listed as threatened in 1998. The study began in 1995 to gain a better understanding of life history aspects and threats to this species. Data were collected annually in early spring and included diameter, condition, reproductive structures, mortality, recruitment, and disturbance by large ungulates. We used odds ratio and probability model analyses to determine effects of large ungulate trampling and weather on these cacti. During the study, plot population declined by 18%, with trampling of cactus, low precipitation, and cold spring temperatures implicated as causal factors. Precipitation and temperature affected flowering, mortality, and recruitment. Large ungulate disturbances increased mortality and reduced the probability of flowering. These results suggest that large ungulate disturbances and recent climate regimes have had an adverse impact on long-term persistence of this cactus.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Effects of ungulate disturbance and weather variation on Pediocactus winkleri: insights from long-term monitoring
Series title Western North American Naturalist
Volume 75
Issue 1
Year Published 2015
Language English
Publisher Monte L. Bean Life Science Museum, Brigham Young University
Publisher location Provo, UT
Contributing office(s) Southwest Biological Science Center
Description 14 p.
First page 88
Last page 101
Country United States
State Utah
Other Geospatial Capitol Reef National Park
Online Only (Y/N) N
Additional Online Files (Y/N) N
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