UCLA Ph.D. Student in Ecology & Evolutionary Biology | 2019 - present
Conservation Genomics of California Red-legged Frog Reintroductions in the Santa Monica Mountains
Outline: California red-legged frogs (Rana draytonii; CRLF) were once ubiquitous accross the Santa Monica Mountains but are now almost locally extirpated. In order to ensure the long-term viability of this population, the National Park Service has been reintroducing this population to nearby streams in their historic range. However, managers of the species do not currently understand to what extent populations harbor deleterious variation as a result of inbreeding or how this harmful variation will affect population fitness in the future. This project will address the following hypotheses:
H1: Populations of CRLF in the Santa Monica Mountains have higher levels of inbreeding and genetic load as a result of long-term small population size
H2: CRLF historical demography will recapitulate a history of human disturbance, with a decline in CRLF effective population size around 100 years ago
Assessing Barriers to California Quail Gene Flow in the Santa Monica Mountains
Outline: Land use alteration is damanging to many species in the Santa Monica Mountains. In galliforms (ground birds including pheasants and quail), it is thought to lead to the creation of isolated metapopulation and overall decreased population viability (Burger 2002). For example, Northern bobwhite quail increase dispersal distance as interpatch habitat distance increases but go to local extinction when the distance between marginal habitat patches is too great (Fies et al. 2002). The purpose of this study is to use high coverage whole genome sequencing across the Santa Monica Mountains to understand the extent to which metapopulation dynamics exist in Southern California populations of quail. Specifically, this project will address the following research hypotheses:
H1: Quail populations located on either side of a roadway will exhibit greater genetic differentiation when compared to populations of equal distance on the same side of the roadway
H2: Genetic differentiation of quail populations on either side of a roadway will be positively correlated with the traffic volume of that roadway
H3: Quail populations that are surrounded by impervious habitat including major roadways and urban centers will exhibit signs of increased genetic load and inbreeding when compared with nearby populations without such constraints to movement and gene flow
Photo by: Merlin Tuttle
Landscape Genetics, Climate Vulnerability, and Historical Demography of the Yuma Bat in California
Outline: Yuma Myotis (Myotis yumanensis, MYYU) is an abundant and widely distributed bat species in California, yet little empirical data exist on MYYU movement and genetic structure across the landscape. Baseline genomic data is key to conserving MYYU populations from the emerging threat of White Nose Syndrome (WNS) in California. For example, research in the Eastern U.S. has shown that topography affects the movement of bats across the landscape, ultimately determining the spread of WNS (Miller-Butterworth et al. 2014; Vonhof et al. 2015). Data on the movement of bats between colonies in California could facilitate predictions regarding how WNS will spread and the landscape features (e.g. mountain ranges) that might serve to insulate colonies from the pathogen. Therefore, this study has the following goals:
1) Provide baseline data on population structure and genetic units for conservation across the state
2) Characterize patterns of gene flow in relation to landscape features
3) Estimate demographic parameters of MYYU populations using coalescent simulations to provide information on historical fluctuations in effective population size
4) Use genetic-environment association methods to characterize genomic variation consistent with local adaptation.
San Nicolas Island | 2018 - present
Black Abalone Surveys
I have worked as a USGS volunteer on the Sea Otter Recovery Project since 2018 to assist in annual black abalone (Haliotis cracherodii) monitoring. This work takes place accross various monitoring sites distributed in rocky intertidal zones on San Nicolas Island. For more information, please refer to the 2019 Annual Monitoring Report linked below.
Mountains Restoration Trust | 2016 - 2019
Invasive Crayfish Removal
Louisiana red swamp crayfish (Procambarus clarkii) were introduced into the Southern California in the 1960s as a bait fish. Today, they are common throughout the streams of the Santa Moninca Mountains. Invasive crayfish pose a problem to native biodiversity as they prey upon most stream organisms. Crayfish are also associated with decreased water quality, stream stability, and even higher incidence of mosquitos! In order to control this problematic species, more research was needed on the most effective ways to remove invasive crayfish through passive mechanical traps. Our approach included a two-week, field-based comparison study to analyze passive trap effectiveness. This research resulted in a pulication in Management of Biological Invasions (linked below).
Water Quality Monitoring
During my time at MRT, I conducted monthly water quaility monitoring in Santa Monica Mountain Streams from 8/22/17 - 3/5/19 in conjunction with crayfish removal efforts. This data was QCed and entered into a public data repository for water quaility data known as the California Environmental Data Exchange Network (CEDEN). Data can be easily queried by following the below link and searching for the Parent Project, "Water Quality Monitoring in the Malibu Creek Watershed".
My water quality work was featured on Spectrum news following the 2018 Woolsey Fire. Use the video link to the left to learn more!