Menu
Contact Us Search

Science Spotlight

Science Institute News

rss

Recent accomplishments of CDFW's scientific community


Ridgway’s Rail Release

Ridgway’s Rail Release

Seven adults carry pet carrier boxes across a coastal meadow
Staff of several wildlife agencies carry light-footed Ridgway’s rails (previously known as light-footed clapper rails) to Batiquitos Lagoon Ecological Reserve.

A man holds a bird with a long beak, while another attaches a band to its leg
A light-footed Ridgway’s rail is banded before release into Batiquitos Lagoon Ecological Reserve.

The Ridgway’s rail is a grayish-brown, chicken-sized bird with a long, downward curving bill and a conspicuous whitish rump. Previously known as the clapper rail, the species name was changed in 2014 to honor ornithologist Robert Ridgway. Three subspecies of Ridgway’s rail are resident in California, all of which depend on mudflats or very shallow water (wetland habitat) where there is both forage and taller plant material to provide cover at high tide. They rely on marsh plants such as cordgrass and pickleweed for breeding and feeding.

One subspecies, the light-footed Ridgway’s rail, was once abundant in the Southern California wetlands, but fell to near extinction in the 1980s as their historical habitats were displaced by housing developments. Today, they have a chance to repopulate, buoyed by recent wetland restoration projects by the California Department of Fish and Wildlife (CDFW) and “Team Rail,” a group that has been dedicated to the recovery of this federal- and state-listed marsh bird for more than a decade.

Team Rail is comprised of scientific staff from CDFW, the U.S. Fish and Wildlife Service (USFWS), the U.S. Navy, three zoological breeding centers (SeaWorld San Diego, the San Diego Zoo Safari Park, and the Living Coast Discovery Center) and the Huntington Beach Wetlands Conservancy. Thanks to their efforts, the 2017 rail population reached 514 pairs in the wild. Each rail release is a step closer to achieving the 1985 Light-Footed Clapper Rail Recovery Plan objective of having 800 breeding pairs in California.

Most recently, five light-footed Ridgway’s rails were released into the Batiquitos Lagoon Ecological Reserve in San Diego County. This release consisted of two mated pairs and three offspring produced by one of the pairs. Three of the adults are retired breeders from the zoological breeding program and are part of a rotation plan to reintroduce retired breeders back into the wild. The release of these individuals will contribute genetic diversity to this highly endangered marsh bird population. Rails bred in zoological facilities were released into Batiquitos Lagoon in 2004 and 2005 (eight rails each year), in 2013 (six rails), 2014 (12 rails), and 2015 (seven rails).

“Given that State Ecological Reserves are set aside for the conservation of threatened, rare and endangered species, and rail releases are targeted for wetlands with small subpopulations (fewer than 50 breeding pairs), Batiquitos Lagoon is an ideal location for the release of Ridgway’s rails,” explained CDFW Senior Environmental Scientist (Specialist) Nancy Frost. “For over a decade, CDFW has supported numerous research and monitoring projects for this species, and we are proud to be a partner in their recovery.”

The state-owned Batiquitos Lagoon is managed by CDFW and is one of the few remaining tidal wetlands on the Southern California coast. Located in the city of Carlsbad, it consists of 543 acres with a drainage basin of about 55,000 acres. It is home to several threatened and endangered birds, insects, plants, fish and mammals and is also designated as a State Marine Conservation Area under the Marine Life Protection Act.

Top photo: A light-footed Ridgway’s rail flies away after being released at Batiquitos Lagoon Ecological Reserve in San Diego County.


Banking on a Future for California’s Natural Resources

Banking on a Future for California’s Natural Resources

a brown frog looks up from green water and grass at the endge of a pond
A California red-legged frog sits motionless at the edge of McClure pond at the Sparling Ranch Conservation Bank. Photo by Ashley Spratt/USFWS

a small stand of oak trees is reflected in the green water of a pond, surrounded by dead, yellow grassy hillsides
McClure pond is one of the most productive California red-legged frog ponds at the Sparling Ranch Conservation Bank. Like many of those on Sparling Ranch, it was named after the family who homesteaded in site in the late 1800s. Photo by Ashley Spratt/USFWS

Since the mid-1980s, California has been using a system of conservation and mitigation banking to protect valuable natural resources and critical habitat for fish, wildlife and plants. These banks are generally large, connected, ecologically meaningful areas of preserved, restored, enhanced or constructed habitat (for example, wetlands) that are set aside for the express purpose of providing mitigation for project impacts. Conservation banks provide mitigation for impacts to listed species and habitats, while wetland mitigation banks primarily provide mitigation for wetland impacts. Together, they serve to prevent inadequate, fragmented reserves that can result when mitigation projects are carried out individually.

Banks work by establishing credits for sensitive species or habitats found on a given site. These credits can then be sold to developers or other project proponents who need to meet permitting requirements or are otherwise required to compensate for environmental impacts. For those parties needing to mitigate for project impacts, banks serve to streamline the regulatory process by providing a pre-established mitigation site that the regulating state and federal agencies have already confirmed will provide adequate and appropriate mitigation for certain habitats or species. By mitigating at a bank, project proponents can avoid the time and cost of searching for a suitable mitigation site and protecting it in perpetuity themselves.

In order for the banking system to be effective, state and federal agencies must work closely together to align processes and practices. Since 1993, CDFW has been participating in the planning, review, approval, establishment, monitoring and oversight of 81 banks statewide. Other agencies that typically participate in the regulation and approval of conservation banks include the U.S. Army Corps of Engineers (USACE), U.S. Environmental Protection Agency (USEPA), Natural Resources Conservation Service (NRCS), U.S. Fish and Wildlife Service (USFWS) and the National Oceanic and Atmospheric Administration National Marine Fisheries Service (NOAA NMFS).

To read more about one of these successful partnerships, link opens in new windowplease visit USFWS’ newsroom.

Learn more about CDFW’s Conservation and Mitigation Banking program, on our website.

All photos courtesy of U.S. Fish and Wildlife Service.

Top photo: A herd of cattle graze atop a hillside at Sparling Ranch near Hollister, Calif. Photo by Ashley Spratt/USFWS.



Recent Posts

  • Restoring Franks Tract Posted 4 days ago
    In the heart of California’s Sacramento-San Joaquin River Delta lies a 3,000-acre flooded island called Franks Tract. Before humans diked and drained Franks Tract to grow potatoes, grains, asparagus and corn, the island was part of a vast freshwater marsh. ...
  • CDFW Bands Together with NWTF to Benefit Wild Turkey Hunters Posted last week
    Tim Hermansen of CDFW carries a turkey holding box to CDFW’s Levi Sousa while John Davis clears the net. Derek Schiewek of CDFW holds a turkey while CDFW’s Laura Cockrell measures the tarsus. Recent efforts to determine the number of turkeys ...
  • Replenishing Southern California’s Abalone Populations Posted 3 weeks ago
    WARC diver Shelby Kawana assesses habitat at one of the CDFW red abalone stocking sites located off the coast of southern California. WARC diver Armand Barilotti assesses habitat at one of the CDFW red abalone stocking sites located off ...
  • CDFW Pilot Study Establishing Foundation for Enhanced Study of Porcupines Posted last month
    Porcupine1: NRVP participants Greg Moore, Mike Maulhardt, Charles Brown and Ben Smith volunteered to service and maintain porcupine stations at Red Lake Wildlife Area. Not to put too fine a point on it, but studying California’s porcupines hasn’t traditionally been ...
  • Sierra Nevada Bighorn: A 21st Century Wildlife Success Story Posted last month
    These pregnant females will bolster the population of a newly established herd as well as provide an infusion of fresh genetic material to helps ensure their new herd’s health and long-term survival. Outfitted with an ear tag and two tracking ...
Read More »

CDFW Science Institute logo