OPTIMIZING ARTIFICIAL RAFT PLACEMENT FOR THE LIGHT-FOOTED RIDGWAY'S RAIL

Jessica M Burton; California State University, Long Beach; jessica.burton01@student.csulb.edu; Dr. Christine Whitcraft, Richard Zembal

Artificial habitat supplementation is a valuable management tool for species facing population declines due to habitat loss, as in the case of the federally endangered light-footed Ridgway's rail (Rallus obsoletus levipes). The majority of this rail's endemic coastal salt marsh habitat has been developed, and remaining habitat is threatened by degradation, fragmentation, and sea-level rise. Currently, artificial rafts in several southern California marshes provide supplemental habitat for nesting and high tide refugia; however, factors impacting the use of these rafts by rails have not yet been examined. Racoons (Procyon lotor), a rail predator, have also been documented using rafts, potentially precluding safe use by rails. To elucidate this, we placed camera traps on artificial rafts and recorded frequency of use of both rails and raccoons and collected data on abiotic conditions, surrounding habitat characteristics and landscape features for each raft. Our preliminary results indicate that rails use rafts more frequently that are placed in habitat with a lower percentage of open, unvegetated  area and a higher diversity of prey species. Conversely, raccoon raft use may be more opportunistic. The insights from this study will help determine how to most effectively allocate management resources and bolster the light-footed Ridgway's rail population.

Ecology and Conservation of Birds - II   Student Paper