Once common along highland streams in western Costa Rica and Panama, the variable harlequin frog, Atelopus varius, is endangered throughout its range, decimated by a disease caused by the amphibian chytrid fungus. On Jan. 17, Smithsonian researchers released approximately 500 frogs at First Quantum Minerals’ concession site in Panama’s Colon province as a first step toward full-scale reintroduction of this species.
The variable harlequin frog, Atelopus varius, takes its name from the variety of neon colors—green, yellow, orange or pink—juxtaposed with black on its skin. In order to monitor the released frogs over time, 30 are wearing miniature radio transmitters. The scientific team also gave each frog an elastomer toe marking that glows under ultraviolet light to mark individuals as part of a population monitoring study.
“Before we reintroduce frogs into remote areas, we need to learn how they fare in the wild and what we need to do to increase their chances of survival in places where we can monitor them closely,” said Brian Gratwicke, international coordinator of the Panama Amphibian Rescue and Conservation project (PARC) at the Smithsonian Conservation Biology Institute. “Release trials may or may not succeed but the lessons we learn will help us to understand the challenges faced by a frog as it transitions from captivity into the wild.”
Variable harlequin frogs are especially sensitive to the amphibian chytrid fungus, which has pushed frog species to the brink of extinction in Central America. PARC brought a number of individuals into the breeding center between 2013 and 2016 as chytrid continued to impact wild populations.
“The variable harlequin frog is one of the closest relatives of Atelopus zeteki, Panama’s iconic golden frog, another target species in our captive breeding program,” said Robert Ibáñez, PARC project director at the Smithsonian Tropical Research Institute in Panama. “We’ll be monitoring the surrounding amphibian community and the climate at this site, and comparing this to the amphibian community at another, control site. This kind of intensive monitoring will help us to understand disease dynamics in relation to the release trials”
PARC members hope to secure the future for this and other endangered amphibians by reintroducing animals bred in captivity according to an action plan developed with Panama’s Ministry of the Environment.
“It took us several years to master how to successfully breed these frogs in captivity,” said Ibáñez. “As the number of individuals we have continues to increase, it provides new research opportunities to understand factors influencing survival that will ultimately inform long-term reintroduction strategies.”
The release trial is made possible with the support of First Quantum Minerals, National Geographic Society, Mohammed bin Zayed Species Conservation Fund and the WoodTiger Fund.
PARC is a partnership between the Cheyenne Mountain Zoo, the Houston Zoo, the Smithsonian Tropical Research Institute, the Smithsonian Conservation Biology Institute and Zoo New England. It has two facilities in Panama: the Gamboa Amphibian Rescue and Conservation Center at STRI and the El Valle Amphibian Conservation Center at El Níspero. Combined, these facilities have a full-time staff caring for a collection of 12 endangered species.
SCBI plays a leading role in the Smithsonian’s global efforts to save wildlife species from extinction and train future generations of conservationists. SCBI spearheads research programs at its headquarters in Front Royal, Va., the Smithsonian’s National Zoo in Washington, D.C., and at field research stations and training sites worldwide. SCBI scientists tackle some of today’s most complex conservation challenges by applying and sharing what they learn about animal behavior and reproduction, ecology, genetics, migration and conservation sustainability.
The Smithsonian Tropical Research Institute, headquartered in Panama City, Panama, is a unit of the Smithsonian Institution. The Institute furthers the understanding of tropical biodiversity and its importance to human welfare, trains students to conduct research in the tropics and promotes conservation by increasing public awareness of the beauty and importance of tropical ecosystems.
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Photo credit: Brian Gratwicke, Smithsonian Conservation Biology Institute