Research

Genetic Diversity of Native Plant Populations

Seed-based restoration after wildfires is common throughout the Great Basin. Native perennial grass species are often included in the seed mix to prevent soil erosion and to provide forage. What are the effects of large-scale seeding on the genetic diversity of native grass populations? I am exploring this question by genotyping bluebunch wheatgrass (Pseudoroegneria spicata) in an area affected by Soda Fire in 2015.

Forward-looking Seed Sourcing

Seed sourcing is an important decision practitioners make in restoration. Will the plants we seed now persist into the future? Climate-adjusted provenancing is an alternative seed sourcing strategy to local provanancing that mixes local seeds with non-local seeds to increase the buffering capacity of restored populations. I conducted a field common garden experiment and found that seeds sourced from warmer and drier sites have higher success of establishment in moderate drought. To examine what the roots are doing belowground, I conducted a greenhouse experiment and found that the trade-offs in drought tolerance (higher fine roots) and invasive resistant (higher SLA) seedling traits complicate the seed selection process. Read more on climate-adjusted seed sourcing and seedling traits.

Functional Diversity and Productivity

Does functional diversity buffer plant communities from drought? Combining plant response data from a rainfall manipulation experiment and greenhouse trait measurements, we found that functional diversity buffered biomass production by enabling shifts in above-and belowground functional traits across variable rainfall conditions. Read more on root functional diversity.

Application of Modern Coexistence Theory

How do we know when restoration is successful? Fluctuating populations and changing starting conditions make evaluation of restoration success tricky. As part of an international working group hosted at the German Centre for Integrative Biodiversity Research (iDiv), I led a study on applying demographic modeling and principles from the Modern Coexistence Theory to rare plant restoration. Using a long-term monitoring data of an endangered species, Contra Costa goldfields (Lasthenia conjugens), from a vernal pool restoration project, we found that model-derived low-density growth rates and per capita intrinsic growth rates were reliable metrics for diagnosing long-term restoration trajectories. Read more on this empirical study and the concept.

Ecological Site Description and Ecosystem Services

How do we manage for multiple ecosystem services? We found that the Ecological Site Description framework developed primarily to manage forage on heterogeneous rangeland landscapes has potential to be useful for managing other resources such as plant biodiversity and soil carbon at the ranch scale. Read more on plant diversity and soil carbon.

Perception of Rangeland Conservation

What are the barriers and opportunities for rangeland conservation in California? In a patchwork of private and public lands, California's rangeland conservation hinges on partnerships across multiple stakeholders. I interviewed ranchers, land managers, and academics in the Central Coast Rangeland Coalition to understand how they perceive rangeland conservation. Read more on this interview.