A new study analyzes the genetic diversity and population structure of the California Ridgway’s rail, Rallus obsoletus, a state and federally-listed endangered bird. The results demonstrate that the so-called “rails” are experiencing negative genetic effects following more than a century of salt marsh habitat loss from agriculture, commercial salt production and urban development.
A new study analyzes the genetic diversity and population structure of the California Ridgway’s rail, Rallus obsoletus, a state and federally-listed endangered bird. The results demonstrate that the so-called “rails” are experiencing negative genetic effects following more than a century of salt marsh habitat loss from agriculture, commercial salt production and urban development.
“Genetic diversity is an important part of ensuring that populations are able to withstand and adapt to disturbance like disease or sea level rise,” said Dustin Wood, lead author and geneticist with the U.S. Geological Survey. “When small, fragmented populations experience genetic bottlenecks, they can be vulnerable to inbreeding population depression or localized extinction, which can mean trouble for the species in the future unless connectivity among populations can be restored.”
Once bordered by wetlands, the San Francisco Bay now retains less than 10 percent of its original marsh habitat. The fragmented marshes that remain lie amid urban and agricultural areas scattered around the Bay. To determine the current genetic diversity and population structure of rails inhabiting these marshes, researchers genotyped 107 rails and inferred gene flow patterns between the North, Central and South Bay.
Continue reading at USGS.
Photo via USGS.
