The rainbow trout is affecting the occupancy of native amphibians in Patagonia

Velasco, Melina Alicia; Berkunsky, Igor; Simoy, María Verónica; Quiroga, Sofía; Bucciarelli, Gary M.; Kats, Lee B.; Kacoliris, Federico Pablo

doi:10.1007/s10750-017-3450-6

Cited by 13 publications

(9 citation statements)

References 30 publications

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“…In this study, we did not find marked individuals from El Rincón in nearby populations. We postulate that the dispersal in the stream habitats is prevented by the occurrence of rainbow trout (Velasco et al 2018). Although some individuals might move outside their habitat, we do not expect that they would reach other local populations.…”

Section: Discussionmentioning

confidence: 89%

“…Gillespie 2001, Matthews et al 2001, Pilliod & Peterson 2001, Martín-Torrijos et al 2016. Velasco et al (2018) found a negative effect of the trout on the occupancy of native amphibians, including Valcheta frogs, in Valcheta Stream. Importantly, the sites currently inhabited by the Valcheta frog at Rama Fría are inaccessible for this exotic predator due to the presence of natural waterfalls, which might explain why frogs are restricted to this stream section, even when some intermediate habitats have suitable reproductive habitat (M. Velasco pers.…”

Section: Discussionmentioning

confidence: 96%

“…The Valcheta frog is a micro-endemic species restricted to the hot headwaters of the Valcheta stream in the Somuncura Plateau. This frog faces a combination of threats, including habitat degradation (Chebez & Diminich 2008, Velasco et al 2016, direct predation by the invasive rainbow trout Onchorynchus mykiss (Úbeda & Grigera 2007, Basso et al 2012, Velasco et al 2018, potential trophic resource competition with the introduced characid fish Cheirodon interruptus (Velasco et al 2018) and infection by the chytrid fungus Batrachochytrium dendrobatidis (Arellano et al 2017a). All these threats are negatively affecting the Valcheta frog by promoting the isolation and decline of local populations, with at least 2 cases of local extinctions in recent decades (Velasco et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Status and population dynamics of the Critically Endangered Valcheta frog Pleurodema somuncurense on the Patagonian Somuncura Plateau

Velasco¹,

Berkunsky²,

Akmentins³

et al. 2019

Endang. Species. Res.

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Amphibian populations are declining globally. In this scenario, detailed information on their ecology is crucial to determine the status and extinction risk of their populations and, therefore, better plan conservation activities. The Valcheta frog Pleurodema somuncurense is a Critically Endangered species, which is endemic to the Valcheta Stream, Patagonia, Argentina. We assessed the status of this species at the metapopulation level, which we consider is a key step in planning management activities. We conducted visual encounter surveys from 2013 to 2019 to determine the distribution range of each local population of the Valcheta frog. During 2015, we also applied a capture-recapture survey to estimate the density and apparent survival of 1 local population. We used POPAN models for density estimation and the classic model of Cormack-Jolly-Seber to estimate apparent survival, using snout-vent length as a covariate. The metapopulation of the Valcheta frog is composed of 9 isolated local populations: 7 extant and 2 extinct. The extant populations have population sizes ranging from 243 to 4516 individuals. The small size of the smaller local populations makes their long-term viability in isolation unlikely. We found a positive correlation between the apparent survival and the snout-vent length of individuals. Our results showed that management strategies should be aimed at ensuring the long-term survival of this species, with a focus on the recovery of extinct populations, the restoration of disturbed habitats and the improvement of connectivity between local populations.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Status and population dynamics of the Critically Endangered Valcheta frog Pleurodema somuncurense on the Patagonian Somuncura Plateau

Velasco¹,

Berkunsky²,

Akmentins³

et al. 2019

Endang. Species. Res.

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“…Local natural resource agencies have recently encouraged commercial harvest, and Love et al (2018) showed, using 26 years of population estimates, that gizzard shad (Dorosoma cepedianum Lesueur) densities declined after Asian carps were numerous and then rebounded following harvest of the Asian carps. Using surveys conducted in 148 sites in a Patagonian stream, Velasco et al (2018) found that the occupancy of the amphibians Pleurodema somuncurense (Cei, 1969) and Rhinella arenarum (Hensel, 1867) was best explained when the presence of invasive trout was included in the models. The negative impact of trout on P. somuncurense is of special concern because it is an IUCN Critically Endangered species in Argentina.…”

Section: Impacts Of Invadersmentioning

confidence: 99%

Preface

et al. 2018

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“…In Argentina, introduced trout are widespread in mountain‐range water bodies. Although some authors have mentioned trout as a potential conservation problem for endemic or micro‐endemic anurans in these systems (Brunetti, 2008; Cuello, Perotti, & Iglesias, 2009; Vaira et al, 2012), to date evidence is scarce: only one study has reported changes in populations of two amphibian species resulting from the presence of trout (Velasco et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Endemic amphibians cornered in headwaters by trout invasion in a mountain range in Argentina

Miloch

Bonino

Leynaud

et al. 2020

Aquatic Conservation

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1. The Sierras Pampeanas Centrales, one of the most important extra-Andean mountain systems of Argentina, harbour endemic and threatened amphibian species. In the past century, two alien predatory fish species (brook trout and rainbow trout) were introduced into rivers and streams of the area where amphibian species breed. 2. We hypothesized that the presence of trout would adversely affect the distribution of native amphibians in streams of the area. To test this hypothesis, the habitat requirements of trout and native amphibians were compared, and the effect of trout presence on amphibian occurrence was evaluated. 3. Transects (n = 126) were surveyed along rivers and streams in high-altitude grasslands of the area, and the occurrences of trout and amphibians and habitat variables were recorded. 4. The habitat requirements of each species were compared using multivariate methods. Generalized linear mixed models were used to evaluate whether the occurrence of amphibians depends on trout, habitat variables or both. The distribution of each species between streams orders was assessed. 5. The results showed that the presence of trout was the main factor conditioning the distribution of two endemic amphibian species (Boana cordobae and Odontophrynus achalensis) in basins of the study area. 6. This threat needs to be incorporated urgently into action plans to guide conservation efforts towards the management of trout populations.

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The rainbow trout is affecting the occupancy of native amphibians in Patagonia

Cited by 13 publications

References 30 publications

Status and population dynamics of the Critically Endangered Valcheta frog Pleurodema somuncurense on the Patagonian Somuncura Plateau

Status and population dynamics of the Critically Endangered Valcheta frog Pleurodema somuncurense on the Patagonian Somuncura Plateau

Preface

Endemic amphibians cornered in headwaters by trout invasion in a mountain range in Argentina

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