A multi-scale evaluation of pack stock effects on subalpine meadow plant communities in the Sierra Nevada

PLoS ONE
By: , and 

Links

Abstract

We evaluated the influence of pack stock (i.e., horse and mule) use on meadow plant communities in Sequoia and Yosemite National Parks in the Sierra Nevada of California. Meadows were sampled to account for inherent variability across multiple scales by: 1) controlling for among-meadow variability by using remotely sensed hydro-climatic and geospatial data to pair stock use meadows with similar non-stock (reference) sites, 2) accounting for within-meadow variation in the local hydrology using in-situ soil moisture readings, and 3) incorporating variation in stock use intensity by sampling across the entire available gradient of pack stock use. Increased cover of bare ground was detected only within “dry” meadow areas at the two most heavily used pack stock meadows (maximum animals per night per hectare). There was no difference in plant community composition for any level of soil moisture or pack stock use. Increased local-scale spatial variability in plant community composition (species dispersion) was detected in “wet” meadow areas at the two most heavily used meadows. These results suggest that at the meadow scale, plant communities are generally resistant to the contemporary levels of recreational pack stock use. However, finer-scale within-meadow responses such as increased bare ground or spatial variability in the plant community can be a function of local-scale hydrological conditions. Wilderness managers can improve monitoring of disturbance in Sierra Nevada meadows by adopting multiple plant community indices while simultaneously considering local moisture regimes.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title A multi-scale evaluation of pack stock effects on subalpine meadow plant communities in the Sierra Nevada
Series title PLoS ONE
DOI 10.1371/journal.pone.0178536
Volume 12
Issue 6
Year Published 2017
Language English
Publisher PLoS ONE
Contributing office(s) Western Ecological Research Center
Description 20 p.
First page 1
Last page 20
Country United States
State California
Other Geospatial Kings Canyon National Park, Sequoia National Park, Yosemite National Park
Google Analytic Metrics Metrics page
Additional metadata about this publication, not found in other parts of the page is in this table