Rediscovery of Atelopus cruciger (Anura: Bufonidae): current status in the Cordillera de La Costa, Venezuela

Rodríguez-Contreras, Argelia; Señaris, J. Celsa; Lampo, Margarita; Rivero, Ramon A.

doi:10.1017/s0030605308000082

Cited by 15 publications

(21 citation statements)

References 10 publications

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“…Thus, the effects of infection by Bd are species-specific, and there are some species in which the host-pathogen relationship has apparently changed. A few species have reappeared following apparent local extirpations (Retallick et al 2004;McDonald et al 2005;Rodriguez-Contreras et al 2008;Newell et al 2013). In the mid-1980s, the Eungella torrent frog (Taudactylus eungellensis) suffered Bd-related population declines; however, 10 years later, infected and uninfected individuals had similar survival rates (Retallick et al 2004).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Infection dynamics in frog populations with different histories of decline caused by a deadly disease

et al. 2015

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Pathogens can drive host population dynamics. Chytridiomycosis is a fungal disease of amphibians that is caused by the fungus Batrachochytrium dendrobatidis (Bd). This pathogen has caused declines and extinctions in some host species whereas other host species coexist with Bd without suffering declines. In the early 1990s, Bd extirpated populations of the endangered common mistfrog, Litoria rheocola, at high-elevation sites, while populations of the species persisted at low-elevation sites. Today, populations have reappeared at many high-elevation sites where they presently co-exist with the fungus. We conducted a capture-mark-recapture (CMR) study of six populations of L. rheocola over 1 year, at high and low elevations. We used multistate CMR models to determine which factors (Bd infection status, site type, and season) influenced rates of frog survival, recapture, infection, and recovery from infection. We observed Bd-induced mortality of individual frogs, but did not find any significant effect of Bd infection on the survival rate of L. rheocola at the population level. Survival and recapture rates depended on site type and season. Infection rate was highest in winter when temperatures were favourable for pathogen growth, and differed among site types. The recovery rate was high (75.7-85.8%) across seasons, and did not differ among site types. The coexistence of L. rheocola with Bd suggests that (1) frog populations are becoming resistant to the fungus, (2) Bd may have evolved lower virulence, or (3) current environmental conditions may be inhibiting outbreaks of the fatal disease.

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Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Infection dynamics in frog populations with different histories of decline caused by a deadly disease

et al. 2015

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“…, Rodríguez‐Contreras et al . ) suggests that some populations have not been affected by disease or climate, or may be recovering. Their ability to stand epidemic outbreaks, climate changes or any other disturbance, however, will ultimately depend on a balance between survival and recruitment rates.…”

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confidence: 99%

High Turnover Rates in Remnant Populations of the Harlequin FrogAtelopus cruciger(Bufonidae): Low Risk of Extinction?

Lampo

Celsa²,

Rodríguez-Contreras

et al. 2011

Biotropica

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Atelopus is among the most threatened of all amphibian genera. Most species of harlequin frogs disappeared more than two decades ago and only a few still exist. From ten critically endangered Atelopus species endemic to Venezuela, Atelopus cruciger is the only one that can be located at present. To assess the status of remnant populations of A. cruciger and to provide the demographic data for designing in situ management programs, we estimated: (1) the population size; (2) the apparent survival; and (3) the recruitment rates of one remnant population using mark‐recapture data. The adult population size varied (69–117), and this variation was not related to that of abundance indices based on visual counts at the river margins. Thus, caution is recommended when using visual counts as an index of abundance in Atelopus, because capture rates differ significantly among months and between seasons. Despite the observed variations, this population appears to be stable. Previous reports suggest that species of Atelopus are long‐lived. For populations of long‐lived species to remain approximately constant, recruitment must be low. Our mark‐recapture study, however, showed that adults tend to remain in the population for approximately 15 mo, but an average of 165 new frogs are recruited every year. Although immigration and emigration are possibilities, the site fidelity and the absence of nearby streams suggests that movement in and out of the study area is less important than births and deaths. Under the proposed hypothesis of a short life expectancy/high recruitment, the risk of extinction must be lower than previously thought.

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“…Con relación a esto, se ha documentado que las enfermedades, cambios climáticos o la sinergia entre estos factores, pudieran estar contribuyendo a la disminución enigmática de los anfibios (Lampo et al 2006, Stuart et al 2004. Por ejemplo, el hongo quítrido Batrachochytrium dendrobatidis -B. d-fue recientemente detectado en otras especies del PNHP y en ranas del género Gastrotheca en los Andes venezolanos , Nicolás 2007, Rodríguez-Contreras et al 2008. En el primer caso, individuos de Mannophryne herminae y Atelopus criuciger recolectados en el parque resultaron estar infectados (Nicolás 2007, Rodríguez-Contreras 2008, a lo igual que G. nicefori en la Cordillera andina venezolana .…”

Section: Cambios Poblacionales En El Pnhpunclassified

“…Por ejemplo, el hongo quítrido Batrachochytrium dendrobatidis -B. d-fue recientemente detectado en otras especies del PNHP y en ranas del género Gastrotheca en los Andes venezolanos , Nicolás 2007, Rodríguez-Contreras et al 2008. En el primer caso, individuos de Mannophryne herminae y Atelopus criuciger recolectados en el parque resultaron estar infectados (Nicolás 2007, Rodríguez-Contreras 2008, a lo igual que G. nicefori en la Cordillera andina venezolana . Independientemente de estos resultados, aun se desconoce la existencia y el grado de patogenicidad del hongo en G. ovifera.…”

Section: Cambios Poblacionales En El Pnhpunclassified

Registro histórico de Gastrotheca ovifera (Anura: Hemiphractidae): evidencias de disminución en selvas nubladas de la Cordillera de la Costa venezolana

Valera-Leal

Acevedo

Sánchez

et al. 2010

RBT

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Historic record of Gastrotheca ovifera (Anura: Hemiphractidae): decline evidence in Venezuelan coastal cloud forests. G. ovifera is a marsupial frog of the cloud and riparian forest from Western and Litoral sections of the Venezuelan Cordillera de la Costa (820-2 000m). This amphibian is considered as an endangered species by the IUCN Species Red List, due to its population decline in pristine and well preserved environments. This conservation status is based on anecdotic interpretations. We collected disperse data from museum records (national and international) and explored the possible association between collection records and precipitation data available for the Henri Pittier National Park (PNHP). Likewise, we carried out a systematic population monitoring of G. ovifera in historic and additional localities among the cloud forest of Rancho Grande, PNHP. We found 106 individuals in 11 zoological collections deposited during 1929-2007. After an effort of 646 hours/ person we did not detect G. ovifera individuals in the evaluated localities; as well as no statistical significant associations between the annual precipitation average and the historic records of the species during 1941-1997 period (r s =-0.054, p=0.820, n=19). We discussed the distribution, fluctuation and population changes of this species, analyzing it conservation status. Rev. Biol. Trop. 59 (1): 329-345. Epub 2011 March 01.

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Rediscovery of Atelopus cruciger (Anura: Bufonidae): current status in the Cordillera de La Costa, Venezuela

Cited by 15 publications

References 10 publications

Infection dynamics in frog populations with different histories of decline caused by a deadly disease

Infection dynamics in frog populations with different histories of decline caused by a deadly disease

High Turnover Rates in Remnant Populations of the Harlequin FrogAtelopus cruciger(Bufonidae): Low Risk of Extinction?

Registro histórico de Gastrotheca ovifera (Anura: Hemiphractidae): evidencias de disminución en selvas nubladas de la Cordillera de la Costa venezolana

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