By Austin Roy (Scientific Aid)
Reintroductions, translocations, and augmentations are methods of restoring or increasing wildlife populations. These actions require a lot of planning and are often expensive. These methods involve removing animals from a source population and placing them in another location. The goal of these efforts are usually to establish a sustainable population where one did not previously exist, provide new individuals to a site with a low population in hopes of increasing the population, and providing new or rare genes to a population that may need genetic rescue, among other reasons.
This summer our University of California, Davis and California Department of Fish & Wildlife (WIL) research team conducted a population augmentation for the endangered Amargosa vole (Microtus californicus scirpensis). Our goal was to supplement a very small population of voles in one marsh with new individuals and genes from a larger population in another marsh.
We placed radio collars on 3 voles at the source site, 4 voles that we removed from the source site and relocated to the recipient site, and 3 individuals at the recipient site. By collaring both relocated voles and resident voles at source site and the recipient site we could monitor how relocated animals utilized the new site and whether or not resident individuals were impacted by the presence of new individuals in their habitat.
The data we collected will greatly benefit vole recovery and inform how we conduct future releases.
In addition to the augmentation efforts this summer we also continued to study the population cycles of voles and predators in the area. These studies allow us to better understand how voles and predators use the area how the predators may be affecting vole populations. We have also been studying the vegetation and water levels to better understand the needs of the Amargosa vole. These efforts will help us better understand how to restore and improve vole habitat.
The research this summer would not have been possible without the support from our partners at the U.S. Bureau of Land Management, U.S. Fish & Wildlife Service, CA Department of Fish & Wildlife (Region 6), Integral Ecology Research Center, U.S. Geological Survey, Shoshone Village, Inyo County Roads Department, and the Amargosa Conservancy.