Progress of the Rana muscosa program
at Los Angeles Zoo

Species

Rana muscosa

Common Name(s)

Southern Mountain Yellow-legged Frog

Region where program is based

North America

Country where program is based

United States

The authority that recommended this species for an ex situ program

Conservation Needs Assessment Workshop

Has a genetic analysis been performed on wild populations to define the target taxon, i.e., verify that single, viable Evolutionarily Significant Units (ESU's) that are managed as separate populations, are not confounded by cryptic species or polymorphisms?

Yes

Name of the institution managing the ex situ population

Los Angeles Zoo

Year the program started

2010

Is at least some portion of the captive population maintained in range country?

Yes

Are sufficient resources available to manage the ex situ population?

No

Are adequate numbers of skilled staff available with the appropriate ex situ amphibian experience?

No

Is sufficient space available for the required population size?

Yes

Additional Support required

Additional Staff

Has a Taxon Management Coordinator for the ex situ population been appointed?

Yes

Taxon Management Coordinator

Ian Recchio of Los Angeles Zoo

Has a Taxon Management Group or Recovery Team been established?

Yes

Has a Taxon Management Plan, Recovery Plan or Species Action Statement been written?

Yes

Web link to Taxon Management Plan

Have Husbandry Guidelines been written?

Yes

Web link to Husbandry Management Guidelines

Have any knowledge gaps in the species biology or in their interaction with potential threats been identified that could benefit from research using the ex situ population?

Yes

List of knowledge gaps

Have founder needs been calculated using the AArk Amphibian Population Management Guidelines ?

No

Have sufficient potential founders been collected? ( AArk Amphibian Population Management Guidelines recommends a minimum of 20 pairs of found animals).

No

If sufficient founders have not been collected, is there an ongoing search for additional founders?

Yes

Is the ex situ population managed by nationals from the range country?

Yes

What tools are used to maximize retention of genetic diversity?

None

Has the population produced viable offspring?

Yes

Have the first generation captive-bred animals bred successfully?

Yes

Is the ex situ population housed in permanent isolation from other populations occurring outside its range?

Yes

Is work being supported to study and mitigate threats to the species in the wild, either by the institution or by a regional wildlife agency?

Yes

Have captive-bred or captive-reared animals been released into the wild?

Yes

If releases were undertaken, have disease screening protocols or veterinary health checks been conducted prior to releases to the wild?

Yes

Is follow-up work being carried out to monitor progress of the released animals?

Yes

Is the taxon again secure in the wild, even if it might still require some ongoing in situ management? i.e. has the need for a captive assurance population been obviated such that we can call this a successfully terminated captive rescue program?

No

Comments

2015: Most recently, we were asked by the Southern Mountain Yellow-legged Frog recovery group to hold two groups of tadpoles from Big Rock and Little Rock canyons in the San Gabriel Mountains to headstart or use as breeding stock. These two localities are considered two of the most Endangered populations of R. muscosa, and represent the only assurance colonies from the San Gabriel recovery unit. Both tadpole groups from the San Gabriel Canyon completed metamorphosis during 2015. These animals will serve as breeding stock or potentially be re-released as the needs of the wild population dictate.