+ JOIN OUR MAILING LIST flickr

Archived Workshops/References

California Red Legged Frog

Description

The California red-legged frog has been protected as a threatened species by the Endangered Species Act since June 1996. The California red-legged frog is the largest native frog in the western United States. It is one of two subspecies of the red-legged frog found on the Pacific coast; the other is the northern red-legged frog Rana aurora aurora. The California red-legged frog once ranged across much of California, including portions of the Sierra Nevada Mountain Range, where it is believed to be the title character of Mark Twain's famed short story, "The Celebrated Jumping Frog of Calaveras County." In 1865, when the story was written, red-legged frogs were the largest frogs in the state; bullfrogs were not introduced to California until 1896. California red-legged frogs have been eliminated from more than 70 percent of their historic habitat. Surveys indicate the frogs are present in about 10 percent of their historic locations. California red-legged frogs are found primarily in wetlands and streams in coastal drainages of central California. Today they are known to occur in about 238 streams or drainages in 23 counties. Monterey, San Luis Obispo, and Santa Barbara counties support the greatest amount of currently occupied habitat. Only four areas within the entire historic range of the subspecies may currently support more than 350 adults. The above is quoted from the USFWS website.

Training Programs

California Red-Legged Frog Field Praticum #1 for repeat Workshop
California Red-Legged Frog Workshop Field Session #1 Mar 14, 2007
California Red-Legged Frog Workshop Mar 15, 2007
California Red-Legged Frog Workshop Field Session #2 Mar 15, 2007 - Mar 16, 2007
California Red-Legged Frog Repeat Workshop: Field Session #1 Mar 21, 2007
California Red-Legged Frog Repeat Workshop: Field Session #2 Mar 22, 2007
California Red-Legged Frog Workshop - Repeat Mar 22, 2007
California Red-Legged Frog Field Training Session #2 Apr 15, 2008
California Red-Legged Frog Workshop Apr 15, 2008
California Red-Legged Frog Field Training Night #2 Mar 26, 2009
California Red-Legged Frog Workshop 2009 Mar 26, 2009
California Red-Legged Frog Workshop Field Practicum #1 2010 Apr 7, 2010
California Red-Legged Frog Workshop 2010 Apr 8, 2010
California Red-Legged Frog Workshop Field Practicum #2 2010 Apr 8, 2010
California Red-Legged Frog Field Practicum #1 2011 Apr 13, 2011
California Red-Legged Frog Field Practicum #2 2011 Apr 14, 2011
California Red-Legged Frog Workshop 2011 Apr 14, 2011
California Red-legged Frog Field Practicum #1a 2011 Apr 27, 2011
California Red-legged Frog Field Practicum #2a 2011 Apr 28, 2011
California Red-legged Frog repeat workshop 2011 Apr 28, 2011
California Red-Legged Frog Management Factors May 19, 2011
California Red-Legged Frog Field Practicum #1 2012 Apr 11, 2012
California Red-Legged Frog Field Practicum #2 2012 Apr 12, 2012
California Red-legged Frog Workshop 2012 Apr 12, 2012
California Red-Legged Frog Field Practicum #1 for repeat Workshop 2012 Apr 25, 2012
California Red-Legged Frog Field Practicum #2 for repeat Workshop 2012 Apr 26, 2012
California Red-legged Frog Repeat Workshop 2012 Apr 26, 2012
California Red-Legged Frog Field Practicum #1 2013 May 8, 2013
California Red-Legged Frog Field Practicum #2 2013 May 9, 2013
California Red-Legged Frog Workshop 2013 May 9, 2013
California Red-Legged Frog Repeat Field Practicum #1 2013 May 15, 2013
California Red-Legged Frog Repeat Field Practicum #2 2013 May 16, 2013
California Red-legged Frog Repeat Workshop 2013 May 16, 2013
Managing Habitats for California Red-legged Frog Workshop 2013 Nov 7, 2013
California Red-Legged Frog Field Practicum #1 2014 May 14, 2014
California Red-Legged Frog Field Practicum #2 2014 May 15, 2014
California Red-Legged Frog Workshop 2014 May 15, 2014

Documents and Publications

TITLE
DATE ADDED
AUTHOR
SOURCE
DESCRIPTION
WORKSHOP MATERIALS
CRLF Survey Appendix D - Site Assessment
PDF, 23KB
Jan 26 11

US Fish and Wildlife
2005
CRLF Workshop 2013 - Bibliography
PDF, 232KB
Apr 30 13
Trish Tatarian and Norman Scott

April 2013
CRLF 2013 Bibliography
CRLF Workshop 2013 - Handouts
PDF, 328KB
Apr 30 13
Trish Tatarian and Norman Scott

April 2013
Supportive handouts for the 2013 workshop
PEER-REVIEWED PUBLICATIONS
A Technique for Locating and Recovering Radiotransmitters at Close Range
PDF, 16KB
Mar 02 07
Gary M. Fellers Patrick Kleeman
Herpetological Review, 2003, 34(2), 123
2003
Cattle Grazing Mediates Climate Change Impacts in Ephemeral Wetlands
PDF, 186KB
May 14 13
Christopher Pyke and Jaymee Marty
Conservation Biology
November 16, 2004
Data from a grazing exclosure study indicated that 3 years after the removal of grazing, ungrazed vernal pools dried an average of 50 days per year earlier than grazed control pools. Modeling showed that regional climate change could also alter vernal pool hydrology. Increased temperatures and winter precipitation were predicted to increase periods of inundation.
Do a threatened native amphibian and its invasive congener differ in response to human alteration of the landscape?
PDF, 199KB
Apr 01 09
Antonia D’Amore, Valentine Hemingway, Kerstin Wasson
Biol Invasions
February 6, 2009
Anthropogenic changes to habitat are a global phenomenon and the impact of these changes may act in tandem to cause loss of biodiversity. One major global change is the introduction of invasive species. In order to determine whether other human impacts might correlate with populations of invaders, we examined the habitat correlates of distribution, persistence and reproduction of a global invader, the American bullfrog (Rana catesbeiana). We then compared these correlates with those of a threatened, native congener, the California red-legged frog (Rana draytonii). We found striking differences between the two species in response to habitat fragmentation and degradation. Our work suggests that human alteration of habitat, in particular the hydrology of freshwater sites and through building roads, favors this invasive species across the landscape.
Effects of the herbicide imazapyr on juvenile Oregon spotted frogs
PDF, 218KB
May 24 13
Amy E. Yahnke, Christian E. Grue, Marc P. Hayes, and Alexandra T. Troian
Environmental Toxicology and Chemistry, Vol. 32, No. 1, pp. 228–235, 2013
2013
The results suggest that imazapyr use in wetland restoration poses a low risk of direct toxic effects on juvenile OSFs
Evaluation of a Radio-Belt for Ranid Frogs
PDF, 136KB
Mar 21 09
Galen Rathbun and Thomas Murphey
Herpetological Review 27(4), 1996
1996
Describes a new method of attaching radios to ranid frogs.
Invasive species shifts onto genetic resource partitioning and microhabitat use of a threatened native amphibian
PDF, 164KB
Apr 05 10
Antonia D’Amore, Eric Kirby, Michael McNicholas
Aquatic Conserv: Mar. Freshw. Ecosyst. 19: 534–541
March 6, 2009
3. There was a marked increase in the total number of adult California red-legged frogs seen in all of the ponds after the first year of bullfrog removal, suggesting that these adults were in the ponds, but hiding when invaders were present. Ontogenetic partitioning of habitat in this species was documented, as well as a shift in that partitioning and increased hiding behaviour with adult bullfrog presence.
Movement patterns of California Red-legged frogs in an inland California environment
PDF, 748KB
Jan 29 13
Patricia J. Tatarian
Herpetological Conservation and Biology
March 30, 2008
Peer reviewed paper on CRLF movement patterns in inland California.
Overwintering Tadpoles in the CaliforniaRed-legged Frog (Rana aurora draytonii)
PDF, 24KB
Mar 02 07
Gary M. Fellers Alan E. Launer Galen Rathbun Steve Bobzien Jeff Alvarez David Sterner Richard B. Seymour Michael Westphal
Herpetological Review, 2001, 32(3), 156-157
2001
Rana Draytonii Dispersal
PDF, 84KB
Jun 14 11
Mark Allaback
Herpetological Review
2010
Rana Draytonii (California Red-legged Frog). Behavior- Dangers of Drift Fences
PDF, 62KB
Mar 21 09
Galen Rathbun, Norman Scott, Thomas Murphey
Herpetological Review 28(2), 1997
1997
A research note with information about California red-legged frog behavior. This particularly deals with the danger of drift fence barriers to the species.
Rana Draytonii (California Red-legged Frog). Egg Predation.
PDF, 39KB
Mar 21 09
Galen Rathbun
Herpetological Review 29(3), 1998
1998
This is a research note that describes important factors of egg predation to the California red-legged frog.
Rana draytonii (California Red-Legged Frog). Predation.
PDF, 216KB
Jun 04 12
Jeff Wilcox
Herpetological Review, 2010, v. 42 #3 pp. 414-415
2010
Bullfrogs found with red-legged young in their stomachs.
Rana Draytonii (California Red-legged Frog). Prey.
PDF, 16KB
Mar 20 09
Marc P. Hayes, Mark R. Jennings, Galen B. Rathbun
Herpetological Review 37(4), 2006
2006
A note explaining prey of California red-legged frog.
Relocations of California red-legged frogs, California, USA.
PDF, 1.2MB
May 25 11
Dana Bland
Re-introduction News, Newsletter of the Re-introduction Specialist Group, IUCN, No. 25:12-13.
2006
Reproductive Interference by an Invasive Species an Evolutionary Trap?
PDF, 130KB
Apr 05 10
Antonia D’Amore, Eric Kirby, Valentine Hemingway
Herpetological Conservation and Biology 4(3):325-330
We detected 43 cases of interspecific amplexus over three years between a threatened amphibian, Rana draytonii, and its invasive competitor and predator, Rana catesbeiana.
Terrestrial activity and conservation of adult California red-legged frogs Rana aurora draytonii in coastal forests and grasslands
PDF, 349KB
Mar 20 09
John B. Bulger, Norman J. Scott Jr., Richard B. Seymour
Biological Conservation 110 (2003) 85–95
2003
The federally threatened California red-legged frog Rana aurora draytonii occupies both aquatic and terrestrial habitats in its adult life stage. The terrestrial activities of this species are not well known and require documentation to assist in the development of appropriate levels of protection under the US Endangered Species Act. We studied the terrestrial activities of radio-tagged redlegged frogs (n=8–26) inhabiting a coastal watershed in Santa Cruz County, California, during 1997–1998. In particular, we investigated (1) the use of terrestrial habitats by non-migrating adults in relation to season, breeding chronology, and precipitation, and (2) adult migration behavior, including seasonal timing, duration, distances traveled, and the use of corridors. (more)
Translocation of California red-legged frogs (Rana aurora draytonii)
PDF, 789KB
Mar 21 09
Galen Rathbun and Julie Schneider
Wildlife Society Bulletin 29(4)1300-1305. 2001
2001
Offers information about the risk of moving individual frogs and suggests considerations for doing so.
Water Temperatures in a California Red-legged breeding pond
PDF, 624KB
Apr 12 13
Galen Rathbun
Immediate Science Ecology 1: 7-11
September 5, 2012
This report describes the use of data loggers to gather water temperature profiles, which demonstrates the potential for broader research on the topic. In addition, the preliminary results and discussion will assist resource man-agers to better understand and develop optimal management and restoration activities for the threatened frog.
OTHER INFORMATION
A Standardized Protocol for Surveying Aquatic Amphibians
PDF, 410KB
Mar 02 07
Gary M. Fellers Kathleen L. Freel
National Park Service
May 1995
Determination of Threatened Status for the California Red-Legged Frog
PDF, 154KB
Mar 02 07
US Fish and Wildlife Service
USFWS
May 23, 1996
Habitat characteristics of California red-legged frog (Rana draytonii): ecological differences between eggs, tadpoles, and adults in a coastal brackish and freshwater system
PDF, 2.4MB
May 25 11
Dawn Kathleen Reis
San Jose State University
December 1999
Light Source and Binoculars for Visual Encounter Surveys of Adult Red-legged Frogs
PDF, 96KB
Sep 21 12
Trish Tatarian Greg Tatarian Norman Scott

September 2012
Paper on selecting lights and binoculars for conducting California Red-legged Frog surveys.
Management Guidlines for the California Red-Legged Frog
PDF, 188KB
Mar 20 09
Drs. Galen Rathbun and Norman Scott
Elkhorn Slough Coastal Training Program
February 2009
This technical paper provides a bibliography and management guidelines for the California red-legged frog. Information presented is not peer-reviewed but is the experience of the authors, who have extensive experience with the organism. Please contact us if you have any concerns or suggestions about the information presented.
Problems and opportunities managing invasive bullfrogs: is there any hope?
PDF, 204KB
May 09 12
Adams, M. J. and C. A. Pearl
Biological invaders in inland waters: Profiles, distribution, and threats. F. Gherardi, editor. Springer Publication Company, New York. 734 pp.
2007
"...consider the case of the Bullfrog, review management options, and suggest directions for future research with this and similar species."
Revised Guidence on Site Assessments for California Red Legged Frog
PDF, 143KB
Jan 26 11
US Fish and Wildlife
US Fish and Wildlife
August 2005
Stockpond Management for the Benefit of California Red-legged Frog
PDF, 101KB
May 24 13
Norman Scott Galen Rathbun Trish Tatarian

2013
Pond management recommendations for Red-legged Frogs

Links

TITLE DATE ADDED
USFWS: Revised Guidance on Site Assessments and Field Surveys for the California Red-legged Frog
http://www.fws.gov/sacramento/es/documents/crf_survey_guidance_aug2005.pdf
Apr 01 09
California red-legged frog sounds, pictures, and information
http://www.californiaherps.com/frogs/pages/r.draytonii.html
Apr 24 08
Recovery Plan for the California Red-legged Frog (Rana draytonii)
http://ecos.fws.gov/docs/recovery_plan/020528.pdf
Apr 16 12
Center for North American Herpetology - California Herp Checklist
http://www.cnah.org/state_nameslist.asp?state_id=5
Jan 25 13
Solano County CRLF Translocation Project
http://www.wra-ca.com/translocation-to-restored-habitat-benefits-threatened-california-red-legged-frog-ridge-top-ranch-conservation-bank-2/
May 14 13
EPA- Pesticide Effects Determinations for the California Red-legged Frog and other California Listed Species
http://www.epa.gov/espp/litstatus/effects/redleg-frog/
May 24 13
Settlement will Safeguard Endangered California Frog from Pesticides
http://www.biologicaldiversity.org/news/press_releases/2013/red-legged-frog-pesticides11-04-2013.html
Nov 12 13