Welcome! Our research focuses on the impact of natural disturbances and global environmental change on mesic and arid grassland ecosystems. We are particularly interested in the interactive effects of fire, grazing and drought in mesic grasslands in North America and South Africa, and how rainfall variability, temperature change, and shrub encroachment affect aridland ecosystems in the southwestern US.

Continental scale study shows vulnerability of herbaceous species to nitrogen and sulphur deposition

From the abstract: Atmospheric nitrogen and sulfur pollution increased over much of the United States during the twentieth century from fossil fuel combustion and industrial agriculture. Despite recent declines, nitrogen and sulfur deposition continue to affect many plant communities in the United States, although which species are at risk remains uncertain. We used species composition data from >14,000 survey sites across the contiguous United States to evaluate the association between nitrogen and sulfur deposition and the probability of occurrence for 348 herbaceous species.

Cross-site synthesis project finds new mechanism for grazing effects on plant species diversity

To paraphrase the abstract:

Southwest Field Ecology at the Sevilleta Field Station, New Mexico

Biology 419.004/519.004 (CRN: 24853/24854)

Description: This course will focus on the ecology of the UNM Sevilleta Field Station in the middle Rio Grande Valley. This course is a residential course based at the Sevilleta. Students will be living on‐site for the week in the residences at the Field Station. During this intensive field course, students will be taking field trips and exploring various sites and habitats in central New Mexico. This field‐based class provides a rich opportunity for context‐based learning.
Students will:

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